ShortPixel Image Optimizer


A freemium, easy to use, comprehensive, stable, and frequently updated image compression plugin supported by the friendly team that created it. 🙂

Increase your website’s SEO ranking, number of visitors, and ultimately your sales by optimising any image or PDF document on your website.
ShortPixel is an easy to use, lightweight, install-and-forget-about-it image optimization plugin that can compress all your past images and PDF documents with a single click. New images are automatically resized/rescaled and optimized on the fly, in the background. It’s also compatible with any gallery, slider or eCommerce plugin.

Ready for a quick DEMO? Test our plugin here and here.
Or you can create a staging copy of your site using WP Staging and test it there.

ShortPixel utiliza muy pocos recursos y funciona bien con cualquier alojamiento web compartido, cloud, VPS o dedicado. Puede optimizar cualquier imagen que tengas en tu web, ¡incluso las imágenes que no aparecen en la biblioteca de medios como las que hay en galerías como NextGEN, Modula o añadidas directamente por FTP!

Both lossy and lossless image compression are available for the most common image types (JPG, PNG, GIF, WebP, and AVIF) plus PDF files.
We also offer glossy JPEG compression which is a very high-quality lossy optimization algorithm. Specially designed for photographers!
Optimized images mean better user experience, better PageSpeed Insights or GTmetrix results, better Google PageRank, and more visitors.

Make an instant image compression test of your site or compress some images to test our optimization algorithms.

¿Por qué ShortPixel es la mejor opción cuando se trata de optimización de imágenes o compresión de PDF?

  • popular plugin with over 300,000 active installations – according to WordPress
  • compress JPG (and its variations JPEG, JPEG 2000, JPEG XR), PNG, GIF (still or animated) images and also PDF documents
  • option to convert any JPEG, PNG or GIF (even animated ones!) to WebP and AVIF for more Google love. How to enable WebP?. What is AVIF and why is it good?.
  • New!: full WP-CLI support for background processing, useful especially for websites with a very large Media Library
  • New!: Easily add recurrent cron jobs for background optimization. Useful if you have users uploading images via the front end of your website
  • option to automatically convert PNG to JPG if that will result in smaller images. Ideal for large images in PNG format
  • option to include the next generation images (WebP and AVIF) into the front-end pages by using the <picture> tag instead of <img>, independent from generating them through the plugin
  • compatible with WP Retina 2x – all retina images are automatically compressed. How to benefit from Retina displays?
  • optimize thumbnails as well as featured images. You can also select individual thumbnails to exclude from optimization
  • advanced exclusion options that allow excluding images based on filename, path, size or complex regex exclusions
  • capacidad para optimizar cualquier imagen de tu sitio, incluidas las imágenes de NextGEN Gallery y cualquier otra galería de imágenes o carrusel
  • option to scale images down, with 2 different options, which is very useful to automatically resize large images. This applies to the featured images and there is no need for additional plugins like Imsanity
  • Conversión de CMYK a RGB
  • omite imágenes ya optimizadas
  • Soporte estelar las 24h (24/7) directamente de los desarrolladores.
  • easily test lossy/glossy/lossless versions of the images with a single click in your Media Library
  • great for photographers: keep or remove EXIF data from your images, compress photos with lossless option
  • funciona correctamente con webs HTTPS y HTTP
  • fully compatible with any WordPress multisite install (either with sub-folders or sub-domains)
  • usa JPEG progresivo para imágenes más grandes para acelerar la visualización de la imagen
  • puedes ejecutar el plugin ShortPixel en varias webs o en un multisitio con una sola clave de API
  • it is safe to test and use the plugin: all the original images are by default saved in a local backup that can be restored with a click, either one by one or in bulk
  • Optimiza en lote todas las imágenes existentes en la biblioteca de medios o en cualquier galería con un solo clic
  • funciona muy bien para webs de comercio electrónico que utilizan WooCommerce u otros plugins
  • funciona muy bien con NextGEN gallery, Foo Gallery y cualquier otra galería y carrusel
  • fully compatible with the WP Offload Media plugin
  • compatible con webs alojadas en WP Engine y todos los principales proveedores de alojamiento
  • compatible con los plugins WPML y WPML Media
  • sin límite de tamaño de archivo
  • Se integra con el tipo de campo post_image de Gravity Forms optimizando las imágenes al subirlas
  • compatible con plugins de marcas de agua
  • opción para desactivar la optimización automática de las imágenes al subirlas
  • no credits are used for the images that are optimised less that 5%
  • direct integration with Cloudflare by using a Cloudflare Token
  • Informe de optimización de 30 días con todos los detalles de las imágenes y estadísticas generales
  • ¡Cumplimos con el RGPD! Leer más.
  • créditos de optimización gratuitos para organizaciones sin ánimo de lucro, contáctanos para más detalles

¿Cuánto cuesta?
ShortPixel viene con 100 créditos gratis al mes y se pueden comprar créditos adicionales por tan solo $4.99 por 5,000 créditos de imagen.
Mira nuestro precios.

★★★★★ Un superplugin que funciona muy bien con un 62 % de reducción global. robertvarns
★★★★★ El ingrediente secreto para una web WordPress. mark1mark
★★★★★ Un plugin imprescindible, ¡gran soporte! ElColo13
★★★★★ ¡Un plugin excelente! ¡Servicio al cliente aún mejor! scaliendo
★★★★★ Gran compresión de imagen, plugin sólido, soporte igualmente excelente. matters1959
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Otros plugins de ShortPixel

¡Ponte en contacto!

Acciones y filtros para desarrolladores

El plugin ShortPixel Image Optimiser llama a las siguientes acciones y filtros:

do_action( 'shortpixel_image_optimised', $post_id );

tras una optimización correcta;

do_action("shortpixel_before_restore_image", $post_id);

antes de restaurar una imagen desde una copia de seguridad;

do_action("shortpixel_after_restore_image", $post_id);

después de una restauración correcta;

For version 4.22.10 and earlier:

apply_filters("shortpixel_backup_folder", $backup_folder, $main_file_path, $sizes);

justo antes de devolver la carpeta de copias de seguridad de ShortPixel, normalmente «/wp-content/uploads/ShortpixelBackups». El código $sizes son los tamaños del array de los metadatos;

For version 5.0.0 and later:

$directory = apply_filters("shortpixel/file/backup_folder", $directory, $file);

just before returning the ShortPixel backup folder, usually /wp-content/uploads/ShortpixelBackups).

apply_filters('shortpixel_image_exists', file_exists($path), $path, $post_id);

el ID de la entrada no siempre se establece, solo si es una imagen de la biblioteca de medios;

apply_filters('shortpixel_image_urls', $URLs, $post_id);

filters the URLs that will be sent to optimisation, $URLs is a plain array;

The filter below is deprecated starting with version 5.0.0!

apply_filters('shortpixel/db/chunk_size', $chunk);

the $chunk is the value ShortPixel chooses to use as the number of selected records in one query (based on total table size), some hosts work better with a different value;

apply_filters('shortpixel/backup/paths', $PATHs, $mainPath);

filters the array of paths of the images sent for backup and can be used to exclude certain paths/images/thumbs from being backed up, based on the image path. $mainPath is the path of the main image, while $PATHs is an array with all files to be backed up (including thumbnails);

apply_filters('shortpixel/settings/image_sizes', $sizes);

filters the array ($sizes) of image sizes that can be excluded from processing (displayed in the plugin Advanced settings);

apply_filters('shortpixel/api/request', $requestParameters, $item_id);

filters the parameters sent to the optimization API (through $requestParameters), described in detail here: ShortPixel Reducer API; $item_id contains the ID of the Media Library item, or the ID of the Custom Media item (when used). In short, this filter can be used to alter any parameters sent to the API, depending on the needs. For example, you can set different resize parameters for different post types, different compression levels, remove EXIF or not, covert WebP/AVIF, and basically any other parameter that is sent to the API for a specific image (together with all its thumbnails).

This filter enables the background ShortPixel processing in additional pages (see here the original list). Here’s an example of this filter that enables the processing on the Comments screen (to be placed in your functions.php file):

add_filter('shortpixel/init/optimize_on_screens', function ($screens) {
    $screens[] = 'edit-comments';
    return $screens;

The edit-comments is the ID of the screen where you want to enable the processing.

If you want to add multiple pages, here’s what the snippet looks like:

add_filter('shortpixel/init/optimize_on_screens', function ($screens) {
    $screens = array('edit-comments', 'plugins', 'another-custom-post-type-page');
    return $screens;

Para definir miniaturas personalizadas para que se procesen en la optimización, tienes dos opciones, donde ambos defines tienen separaciones por comas:


gestionará miniaturas personalizadas como «imagen-100x100_tl.jpg»;


gestionará miniaturas personalizadas como «imagen-uae-100×100.jpg»;


will tell the plugin to create double extensions for the WebP/AVIF image counterparts, for example, image.jpg.webp/image.jpg.avif for image.jpg;

Oculta los ajustes de Cloudflare definiendo estas constantes en el archivo «wp-config.php»:

define('SHORTPIXEL_CFTOKEN', 'the Cloudflare API token that has Purge Cache right');
define('SHORTPIXEL_CFZONE', 'The Zone ID from the domain settings in Cloudflare');

Add HTTP basic authentication credentials by defining these constants in wp-config.php

define('SHORTPIXEL_HTTP_AUTH_USER', 'user');


  • Optimización en lotes en marcha. (Medios>ShortPixel en lotes)

  • Activa tu clave de API en los ajustes del plugin. (Ajustes>ShortPixel)

  • Check out the main settings after the API key is activated. (Settings>ShortPixel)

  • Modifícalo usando los Ajustes avanzados. (Ajustes>ShortPixel)

  • Comprime todas tus imágenes antiguas en un solo clic. (Medios>ShortPixel en lotes)

  • Check image optimization status, and restore or reoptimize the image. (Media>Library)

  • Check image optimisation details. (Media>Library->Edit)

  • Check other optimized images' status - themes or other plugins' images. (Media>Other Media)


Let’s get the ShortPixel plugin running on your WordPress website:

  1. Regístrate usando tu correo electrónico en
  2. Recibirás tu clave de API personal en un correo electrónico de confirmación, en la dirección que proporciones.
  3. Sube el plugin de ShortPixel a la carpeta /wp-content/plugins/
  4. Use your unique API key to activate the ShortPixel plugin in the ‘Plugins’ menu in WordPress.
  5. Las imágenes subidas se pueden optimizar automáticamente en la Biblioteca de medios.
  6. ¡Hecho!

Preguntas frecuentes

How does ShortPixel compare to other image optimisation plugins (e.g Smush, Imagify, TinyPNG, Kraken, EWWW, Optimole)?

ShortPixel consistently has better compression rates along with more features, backup support and has very affordable one-time or monthly plans.
Here are a couple of independent reviews:
AuthorityHacker – “ShortPixel is our tool of choice, simply because it’s pretty much automated – we just let it do its thing.” (read full review)
WP Modula – “One of the reasons I’m personally a huge fan of ShortPixel is the built-in support for next-gen image formats like WebP.” (read full review)

¿Puedo usar la misma clave de API en múltiples sitios?

Yes, you can.
As long as you have available credits, you can use a single API Key on as many websites as you wish!

What plan is better for me? What do you recommend?

Everyone has different needs, but generally, we recommend getting a One-Time plan to optimize your whole Media Library and then get a Monthly plan to optimize your future uploads. To learn more, have a look at this comparison

I don’t know how many thumbnails do I have, what plan should I take?

To know how many thumbnails you have, just install the plugin and go to Media > Bulk ShortPixel. The plugin will tell you how many thumbnails you’ve got. Based on this, have a look at our plans

Can I upgrade/downgrade easily my plan?

Of course. You can upgrade or downgrade your plans in a couple of clicks from your account on

¿Puedo probar/usar el plugin gratis?

Yes, you can.
We offer 100 free image optimization credits each month. Exceeding the monthly free quota will pause the optimization process till the quota is reset or extended by buying one of our plans.

¿Puedo optimizar imágenes que no existen en la biblioteca de medios?

Por supuesto.
De hecho, puedes optimizar cualquier imagen que tengas en tu sitio, independientemente de su ubicación. Solo tienes que añadir, en la sección Avanzado de los Ajustes de ShortPixel, las carpetas donde se ubican las imágenes que quieras optimizar y ShortPixel hará su magia y hará el resto.

Can I optimize images that are both past and new?

You can optimize all your past/current images and photos using our “Bulk ShortPixel” page in your Media with a single click.

¿Un crédito = una imagen optimizada?

Yes, that is correct.
But please note that usually, an image in Media Library has 5 or more associated thumbs. Each optimized thumbnail requires a credit. In the rare cases when ShortPixel does not optimise the image (lossy) with at least 5%, the credit will not be consumed, though.

¿Puedo restaurar mis imágenes? ¿Qué pasa con las originales?

If you choose the “Image backup” option in Settings/ShortPixel then the original version of any optimized image or PDF will be saved in the backup folder.
The original image is needed if you want to restore an image or if you want to convert an image from lossy/glossy to lossless or vice-versa.

¿Qué tipos de formato se pueden optimizar?

ShortPixel optimises JPEG (JPG, JPEG, JPEG 2000, JPEG XR), PNG, GIF (animated and still), and PDF type of files.

¿Tenéis planes de un solo uso?

Sí, tenemos.
Los créditos que vienen con nuestros planes de un solo uso nunca caducan. ¡Bien! 🙂

¿Qué pasa con mis imágenes existentes?

Tus imágenes existentes son reemplazadas por las optimizadas.
Si eliges la opción de copia de seguridad, las originales se guardarán en una carpeta separada para que puedas restaurarlas si alguna vez necesitas/quieres hacerlo.

¿Cómo funciona el plugin?

Our lightweight plugin sends the original images to our Image Optimization Cloud where they are compressed. ShortPixel then downloads the optimized images and the unoptimized originals are replaced with the optimised versions.

Do you optimize images in the cloud?

Yes, all the images processed by ShortPixel are optimized in the Cloud. This takes the load off of your server and allows us to produce the best results.

¿Qué métodos de pago son aceptados?

We accept payments via card (Mastercard, Visa, Maestro, American Express, Discover, Diners Club, JCB, UnionPay), PayPal, and Apple Pay.

¿Cómo activo la clave de API en un multisitio?

Tienes que activar el plugin en la administración de la red y, después, activarlo manualmente en cada sitio individual del multisitio. Una vez que lo hayas hecho, aparecerá el menú de ajustes y podrás añadir la clave de la API para cada sitio individual.
Como alternativa, puedes editar el archivo «wp-config.php» y añadir esta línea:


donde APIKEY es la clave recibida de la API al registrarse.
Si se configura de esa forma, la clave de la API se usará para todos los sitios del multisitio, pero solo será visible en la página de ajustes del sitio principal, estando oculta para el resto de los sitios.

I am not the only one working on the WordPress Dashboard. How can I hide my API key?

Hay una sencilla forma de ocultar la clave de la API, todo lo que tienes que hacer es añadir estas dos líneas a tu archivo «wp-config.php»:

define('SHORTPIXEL_API_KEY', '<<your api key here>>');
define('SHORTPIXEL_HIDE_API_KEY', true);

¿Cuánto es un crédito?

Se utiliza un crédito cada vez que ShortPixel optimiza una imagen o miniatura en al menos un 5%. Si no podemos optimizar una imagen o miniatura en al menos un 5%, no se utilizará ningún crédito 🙂
Ten en cuenta que, por lo general, las imágenes en tu biblioteca de medios tienen 3-5 miniaturas asociadas, y se utilizará un crédito por cada imagen destacada o miniatura asociada que se optimice.

Why shall I use a WordPress plugin and not an offline tool?

Because ShortPixel algorithms were perfected while optimizing over 3.5 billion real-life images.
ShortPixel not only offers the best compression for JPEG, PNG, GIF, and PDF files but it also saves you a lot of time. You just install it on your site and then ShortPixel will take care that all the images on your site are immediately optimized after upload.

¿La optimización de imágenes afecta a mis etiquetas ALT?

No, ShortPixel solo optimiza las imágenes, no tocará nada más como tu HTML/CSS.

Si dejo de usar ShortPixel, ¿mis imágenes permanecerán optimizadas?

Once optimized, the images will remain optimized unless you explicitly choose to restore them. But why would you do that? 🙂

¿Tengo que pagar mensualmente o una vez?

We have both options available.
One-time credits never expire and are a bit more expensive. Check out our prices here

¿Cuándo puedo cancelar un plan mensual?

Cuando quieras.
Los créditos que aún tengas disponibles en el período de facturación actual seguirán estando disponibles hasta el final del período de facturación. Al final, no se te volverá a facturar y el plan se restablecerá al plan gratuito.

When do credits expire?

Los créditos mensuales caducan después de 30 días, mientras que los créditos de un solo uso nunca caducan.

¿Tenéis una API?

Sí, tenemos varias APIs y herramientas.
Puedes obtener más información acerca de esto aquí:

Can I use the ShortPixel WP plugin on a localhost installation?

Lamentablemente no 🙁
Pero puedes utilizar nuestra herramienta de línea de comandos o nuestra herramienta web

¿Cómo funciona el redimensionamiento?

If you choose the option to resize images on your site, then the featured image can be resized to a predefined size while keeping its aspect and proportions intact. The associated thumbs won’t be resized.
Using this option you can safely upload original images safely without needing to apply any pre-processing to make them smaller.

¿Funcionará ShortPixel si mi web usa CloudFlare?

Absolutely! Sometimes you’ll need to make sure you whitelist some IPs, just contact us and we’ll assist you with that.

Estoy atascado. ¿Qué hago?

El equipo de ShortPixel está aquí para ayudarte. ¡Contáctanos!


29 de agosto de 2022
Just an amazing tool. Light-weight - at least for me - fully compatible with PHP 8.1, flexible (can setup custom folder to optimize, for example, Elementor's automatically generated Thumbnails that are not in the Media Gallery), works great with NGINX and also offers the possibility to serve both WebP or AVIF. The credit system is amazing, making the plugin suitable for any developer... If you don't need to optimize thousands of images, then buy the number of credits that you think will do better for you and that's all... And, last but not least, amazing support. They answered my questions even on weekends, so you can see how serious they take the "international support" role. 10/10 !!
12 de agosto de 2022
I could not recommend ShortPixel Image Optimizer more strongly. This plugin has saved me hours of messing with FTP, broken images, etc. It quickly optimized our 1000+ images, and kept us from needing to do an $850 price jump to the next plan with our hosting provider. All done with just a couple of clicks and an open window in the background. When I had a question, I reached out to get support, and received an answer (and help!) within a day - even though I'd reached out late at night. 10/10
11 de agosto de 2022
I use ShortPixel on several websites to optimise performance. I am very satisfied with the quality and the price-performance ratio is also OK. When there was a customisation problem with my specific configuration (theme/plugins), I had contact with the support and they helped me very friendly and with patience until the problem was completely solved. Many thanks for that! And five stars. Martin
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Colaboradores y desarrolladores

Este software es de código abierto. Las siguientes personas han contribuido a este plugin.


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Registro de cambios


Release date August 29th, 2022
* Fix: one of the processing queues was flooded in certain situations, on sites with many concurrent editors;
* Fix: the file name was missing in the bulk processing preview;
* Fix: the queues were deleted when activating the plugin; now they are preserved and bulk processing can continue after updating/reactivating the plugin;
* Fix: retina backups were not removed when an image was deleted from the Media Library;
* Fix: NGG screen check caused processor to load on plugin/dashboard pages;
* Fix: stats were saved incorrectly when the plugin was deactivated;
* Fix: some PHP notices were displayed due to numbering format for Polish language;
* Fix: various minor fixes, error code handling and code cleanup;
* Fix: screenshots were updated to reflect the latest version of the plugin;
* Fix: updates to wording throughout the plugin and in the readme file;
* Language: 1 new string added, 0 updated, 0 fuzzed, and 1 deprecated.


Release date August 8th, 2022
* Fix: the Previous Bulks now displays the number of credits used instead of the number of Media Library items, to avoid confusion;
* Fix: the notification for migrating the old format of optimization information was not getting triggered anymore;
* Fix: excluded images and/or thumbnails can now be restored from the backup;
* Fix: added prevention for double database queries when checking if an item is already in the queue;
* Fix: the bulk restore and bulk migration of optimization data can now be done even if out of credits;
* Fix: reduced the number of database table checks done on wp-admin pages to the minimum possible;
* Fix: the out-of-quota message was not always showing up properly;
* Fix: the bulk migration of the optimization data now marks as optimized the images that have proper backups in place;
* Fix: the thousands separators are now displayed properly for all languages;
* Fix: the optimized/unoptimized Media Library filter has proper pagination and also works with WPML;
* Fix: in case the optimization percentage is an integer, drop the .00 (83.00% -> 83%);
* Fix: improved the settings and bulk pages load time for sites with a huge number of items in the Media Library;
* Fix: properly save the optimization information even if the filename is huge;
* Fix: the Optimize now button wasn’t showing up on Custom Media right after restoring an item from the backup;
* Fix: more fixes for multisite installs where the old blogs.dir folder structure is used;
* Fix: multiple fixes and improvements for WP-CLI, including more detailed embedded docs and examples;
* Fix: multiple fixes and improvements to the whole exclusions module;
* Fix: multiple fixes and improvements in handling how retina images are optimized;
* Fix: various small fixes and improvements to the debug mode of the plugin;
* Tweak: CTRL+S can now be used to save settings (you’re welcome!);
* Tweak: added support for bulk processing via the processing hook;
* Tweak: various wording and text updates in the plugin and the readme file;
* Language: 10 new strings added, 8 updated, 0 fuzzed, and 2 obsoleted.


Release date July 26th, 2022
* Fix: the notification about credits used had some test data, resulting in wrong information (sorry again!);
* Language: 0 new strings added, 0 updated, 0 fuzzed, and 0 obsoleted.


Release date July 25th, 2022
* Fix: the “Search and Migrate All” tool now contains a fix for many cases where the message “Could not create backup” shows up;
* Fix: a fatal error was crashing the plugin settings in PHP 7.2;
* Fix: in certain cases, the optimization was looping due to WooCommerce’s thumbnail system;
* Fix: in some cases, WooCommerce as well as other plugins were returning a wrong thumbnail URL and this case was not treated properly;
* Fix: optimization wasn’t working correctly for multisite installs with the very old blogs.dir setup;
* Fix: some notifications could not be properly dismissed (sorry for that!);
* Fix: the integration with WP Offload Media has been enhanced for the case where the media files are not stored anymore on the local server;
* Fix: some errors were showing up in certain cases where the next generation image delivery was active together with the WP Offload Media plugin;
* Fix: the error box was not showing up anymore at the end of the bulk processing, or it was displaying wrong counts;
* Fix: the “Optimize Now” action from the Custom Media had a wrong link;
* Fix: in some cases, the bulk processing wasn’t displaying the correct step for migration/restore operations;
* Fix: the deactivation feedback was sent even if no selection was made in the pop-up;
* Fix: the optimized/unoptimized filter was also displaying private posts;
* Fix: various small fixes and code improvements to make the ShortPixel support team’s lives easier;
* Tweak: added a “processing” message when a new action is manually requested by the user;
* Tweak: added a tool-tip for the number of items currently in the processing queue;
* Tweak: added the resize type (cover/contain) on the image edit screen;
* Language: 10 new strings added, 2 updated, 0 fuzzed, and 6 obsoleted.


Release date July 7th, 2022
* Fix: in some cases the legacy optimization data was not migrated properly, resulting in backup-related errors;
* Fix: added the possibility to redo the migration of the optimization data when the backups exist;
* Fix: significantly reduced the number of queries when WP Offload Media is in use, as this was causing slowness in some cases;
* Fix: the automatic processing now works correctly when using the block editor as well as on other pages where it was broken;
* Fix: the unlisted thumbnails were not processed correctly and showed up as not optimized;
* Fix: the integration with the Photo Engine and WP/LR Sync plugins works properly again;
* Fix: the filter in the Media Library was making the image name go away;
* Fix: changing the API Key now resets correctly the credits information;
* Fix: removed a persistent notification about a potential insufficient quota;
* Fix: the “Optimize now” button works correctly in Custom Media;
* Fix: the “Extend quota” button works correctly in the Media Library;
* Fix: other folders from the wp-content/uplods folder can now be added as Custom Media folders;
* Fix: the size exclusions were not working as expected for thumbnails;
* Fix: updated various pieces of code in accordance with the WordPress Coding Standards;
* Tweak: the wait time between checking if there is anything to optimize has been lowered;
* Tweak: added a clear function for WP-CLI, to clear the existing queue(s);
* Language: 3 new string added, 0 updated, 0 fuzzed, and 7 obsoleted.


Release date June 22nd, 2022
* Fix: some notifications could not be dismissed because of a jQuery error, kudos to @KZeni for the fix;
* Fix: a JS typo was preventing certain actions from completing in the Media Library;
* Fix: an error was showing up in the bulk when the legacy format date field was missing or incorrect;
* Language: 0 new string added, 0 updated, 0 fuzzed, and 0 obsoleted.


Release date June 21st, 2022
* Fix: the plugin now recognizes the offloaded WebP/AVIF files, when they are not also present anymore on the server;
* Fix: in some cases, the bulk and manual optimization was stuck due to some errors related to the legacy optimization information;
* Fix: when saving the settings, the credits quota and other API-related data will be sent to the API, for faster sync;
* Fix: when having the backups turned off, a placeholder image was displayed instead of the original one;
* Fix: an empty space was sometimes shown on some pages, as a result of some dismissed notifications;
* Fix: various small fixes around the plugin processing engine, for increased speed and stability;
* Fix: updated various pieces of code in accordance with the WordPress Coding Standards;
* Language: 1 new string added, 0 updated, 0 fuzzed, and 0 obsoleted.


Release date June 16th, 2022
* Fix: an uncaught error was fixed for the sites running without the fileinfo PHP extension that is needed by the plugin to get the mime type of the files;
* Fix: the resize switch from the settings wasn’t properly working;
* Fix: a hidden modal in the dashboard was taking up a lot of empty space;
* Fix: some popups in the settings were always getting triggered in WordPress versions 5.5 and below;
* Fix: if the admin bar tooltip cannot load for any reason, let the JS processor continue its job;
* Fix: advancing from step 2 of the bulk process was sometimes blocked;
* Tweak: improved the notification text and updated the link around the legacy metadata migration;
* Tweak: the legacy conversion notification is now hidden when out of credits;
* Language: 0 new strings added, 3 updated, 0 fuzzed, and 0 obsoleted.


Release date June 14th, 2022
* Fix: a fatal error showed up in some cases right after updating the plugin, which is now fixed;
* Language: 0 new strings added, 0 updated, 0 fuzzed, and 0 obsoleted.


Release date June 14th, 2022

We hope today is a lucky day because SPIO 5 is super cool, excellent, and faster. Now, bug-free! Just kidding 🙂 read on for the changelog and be kind to us in reporting issues. The dev team will be eternally grateful!
* New: this is a major rewrite of the plugin, where all the processing engine has been completely changed, as well as other major parts of the plugin;
* New: the optimization information is moved to custom tables in the database in order to avoid the situation when re-optimization occurs because ShortPixel optimization data was wiped;
* New: the whole bulk processing has been reworked and streamlined into a very nice 4 steps process, with more details and clarity about what is going to be processed;
* New: the JavaScript processor that is in charge of processing everything that needs to be optimized has been completely rewritten, adding more clarity and details;
* New: added WP-CLI support for most of the operations that can be performed with the plugin; please check the knowledge base for more details;
* New: due to the new bulk and JS processor, WebP and/or AVIF files can be generated without the need to re-optimize the whole Media Library;
* New: added more features for Custom Media, such as Cloudflare integration, displaying the internal ID for easier tracking, checks for permissions when adding new folders, and other smaller fixes;
* New: the settings were reorganized and refreshed, a Tools tab was added and tooltips are now available for an easier understanding of the functionalities;
* New: Breaking Change! regex exclusions are now moved to their own type regex-name and regex-path; if you are using regex exclusions please check them in detail and adjust as necessary;
* New: added the possibility for double AVIF extension that works in a similar manner to the double WebP extension;
* Tweak: removed Process in the front-end option due to performance issues; the same effect can now be achieved with WP-CLI commands;
* Tweak: Breaking Change! due to the code changes, some of the filters in version 4 are now deprecated; please check again your integrations if you used a filter in version 4;
* Tweak: removed the integration with Cloudflare Global API Key for security reasons, please use the Cloudflare Token instead;
* Fix: the image size is now updated correctly in the database (following the change in WordPress 6.0);
* Fix: in some cases, when running out of credits, the PDF upload wasn’t possible;
* Fix: the optimized/unoptimized filter in Media Library works correctly now;
* Fix: a confirmation message shows up again when saving settings;
* Language: pretty much all strings were either added, updated, fuzzed, or obsoleted, therefore we didn’t lose time in counting them; we hope you will understand.


Release date June 2nd, 2022
* Fix: updated all add_query_arg and remove_query_arg functions for enhanced security;
* Fix: in some cases, the offloading via WP Offload Media wasn’t properly done when converting from PNG to JPG;
* Fix: PDF files weren’t offloaded via WP Offload Media when running out of credits;
* Fix: removed the backups folder calculation because it was making the settings page very slow in certain cases;
* Fix: removed the consumed credits from the statistics tab, because it wasn’t working correctly;
* Fix: increased the default image resize options;
* Fix: a potential fatal error on PHP 8 was corrected;
* Tweak: added a new filter for the requests that are sent to the optimization API, documented above in the Developers section;
* Language: 0 new strings added, 0 updated, 0 fuzzed, and 0 obsoleted.


Release date March 31st, 2022
* Fix: fixed the integration with the WP Media Offload plugin, which was broken in version 3.6.0;
* Fix: added support for offloading AVIF files via WP Media Offload;
* Fix: PDF files were not offloaded via WP Media Offload if the process PDF option wasn’t enabled in SPIO;
* Fix: added support for delivering animated gif files as WebP when using the .htaccess method;
* Fix: the link for the plugin settings was leading to a 404 in the network admin of a multisite install;
* Tweak: added 2 new constants for adding the HTTP basic authentication credentials directly in wp-config.php;
* Tweak: added a notification in case of downgrading from the upcoming SPIO 5 version;
* Compat: added integration with Pantheon cache, thanks to @TrilipuT & @LogicEveryWhere;
* Language: 3 new strings added, 0 updated, 0 fuzzed, and 0 obsoleted.


Release date February 8th, 2022
* Fix: an error was occurring on new installs when using PHP8;
* Fix: when uploading an image through Gutenberg’s image block, the optimization wasn’t getting triggered;
* Fix: wrong path for picturefill.js that was used only in certain cases on IE;
* Language: 0 new string added, 0 updated, 0 fuzzed, and 0 obsoleted.


Release date January 17th, 2022
* Fix: switched all requests to the API to https to avoid insecure warnings;
* Fix: certain excludes by path were seen as regex-only and weren’t processed correctly;
* Fix: the upgrade pop-up was not considering properly AVIF & WebP when proposing upgrade options;
* Fix: in certain cases, on Custom Media, there were some PHP Notices related to backups;
* Fix: AVIF files weren’t removed when deleting an image from the Media Library;
* Fix: when the option to optimize images added in the front-end was enabled, some unnecessary calls to the backend were made in some cases;
* Language: 0 new string added, 0 updated, 0 fuzzed, and 0 obsoleted.


Release date October 11th, 2021
* Fix: the plugin is now checking for the UPLOADS constant when building the paths on MultiSite installs;
* Fix: in certain specific cases, a fatal error was triggered when the backup couldn’t be restored;
* Fix: if the automatic Media Library optimization is disabled, the plugin will also disable the front-end processing option;
* Fix: removed inaccurate statistics from the bulk screen summary until the next major release;
* Language: 0 new string added, 0 updated, 0 fuzzed, and 0 obsoleted.


Release date August 31st, 2021
* Fix: in some cases, the MIME type of other files than images were wrongly set to image/jpg;
* Fix: when restoring from backup a PNG that was converted to JPG, the MIME type wasn’t set back to image/png;
* Fix: in case backup fails for any reason, the image in discussion will be skipped (so the original one won’t get overwritten);
* Language: 0 new string added, 0 updated, 0 fuzzed, and 0 obsoleted.


Release date August 25th, 2021
* Compat: Added a notification system for the cases when AVIF files cannot be delivered with the current server/host settings;
* Compat: bumped the minimum supported PHP version to 5.6;
* Language: 5 new string added, 0 updated, 0 fuzzed, and 0 obsoleted.


Release date July 28th, 2021
* Fix: Error when using WordPress 5.8 Widget editor;
* Fix: Error when using WP-Offload and WebP image could not be detected;
* Fix: PNG2JPG when using WP without date directory format would incorrectly add ./ to filename;
* Fix: Unregistered retina files could throw off optimization;
* Fix: Easy Watermark plugin changed its main file, so it couldn’t be properly detected;
* Language: 0 new string added, 0 updated, 0 fuzzed, and 0 obsoleted.


Release date May 12th, 2021
* Fix: the Bulk screen reflects better the extra credits used for WebP and/or AVIF creation;
* Language: 1 new string added, 0 updated, 0 fuzzed, and 0 obsoleted.


Release date May 5th, 2021
* Fix: undefined variable notice;
* Fix: some strings had the wrong translation domain;
* Fix: WSO banner can now be hidden either with a constant or with a filter;
* Language: 0 new strings added, 0 updated, 0 fuzzed, and 0 obsoleted.


Release date April 28th, 2021
* New: ability to generate and serve the AVIF version of the images;
* New: WebP and AVIF files can now be delivered without conditioning of the generation of such files;
* Fix: Keep the loading=lazy attribute on IMG tags when delivering next-generation images using the picture method;
* Fix: Custom database tables were created without primary keys and that caused issues in some cases;
* Fix: Empty alt tag should not be stripped with WebP delivery;
* Fix: bug when using S3-offload in combination with Webp delivery;
* Fix: fixes, additions, and tweaks to the plugin notifications system;
* Language: 9 new strings added, 14 updated, 0 fuzzed, and 0 obsoleted.


  • please refer to the changelog.txt file inside the plugin archive.