Title: Optisize – WebP Konwerter
Author: Mateusz Krosnowski
Published: <strong>February 9, 2026</strong>
Last modified: February 9, 2026

---

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# Optisize – WebP Konwerter

 By [Mateusz Krosnowski](https://profiles.wordpress.org/krosnowksy/)

[Download](https://downloads.wordpress.org/plugin/optisize-webp-konwerter.1.1.6.zip)

 * [Details](https://test.wordpress.org/plugins/optisize-webp-konwerter/#description)
 * [Reviews](https://test.wordpress.org/plugins/optisize-webp-konwerter/#reviews)
 *  [Installation](https://test.wordpress.org/plugins/optisize-webp-konwerter/#installation)
 * [Development](https://test.wordpress.org/plugins/optisize-webp-konwerter/#developers)

 [Support](https://wordpress.org/support/plugin/optisize-webp-konwerter/)

## Description

Optisize is a powerful yet lightweight WordPress plugin designed to automatically
optimize your media library. It hooks into the upload process to ensure every image
you add to your site is compressed and converted to WebP, significantly improving
page load speeds and SEO performance.

Key Features:
 * **Automatic WebP Conversion**: Automatically converts JPG, JPEG,
and PNG uploads to WebP. * **Smart Compression**: Maintains high visual quality 
while drastically reducing file sizes. * **Bulk Optimization**: Process your existing
media library with a built-in batch processing tool. * **Easy Toggle**: Quickly 
enable or disable optimization directly from the Media Library. * **Content Replacement**:
Automatically updates post content to point to the new WebP versions of your images.

## Screenshots

 * [[
 * The Optisize settings dashboard.
 * [[
 * The toggle switch in the Media Library.

## Installation

 1. Upload the `optisize` folder to the `/wp-content/plugins/` directory.
 2. Activate the plugin through the ‘Plugins’ menu in WordPress.
 3. The plugin will immediately start optimizing new uploads.
 4. For existing images, go to the Optisize settings page to start a bulk conversion.

## FAQ

### Does it delete original images?

Yes, to save server space, the plugin replaces the original JPG/PNG files with their
WebP counterparts.

### Can I disable it temporarily?

Yes, there is a toggle in the Media Library to quickly turn the automatic conversion
on or off.

### Does it support GIFs?

Currently, Optisize supports JPEG and PNG files.

## Reviews

There are no reviews for this plugin.

## Contributors & Developers

“Optisize – WebP Konwerter” is open source software. The following people have contributed
to this plugin.

Contributors

 *   [ Mateusz Krosnowski ](https://profiles.wordpress.org/krosnowksy/)

[Translate “Optisize – WebP Konwerter” into your language.](https://translate.wordpress.org/projects/wp-plugins/optisize-webp-konwerter)

### Interested in development?

[Browse the code](https://plugins.trac.wordpress.org/browser/optisize-webp-konwerter/),
check out the [SVN repository](https://plugins.svn.wordpress.org/optisize-webp-konwerter/),
or subscribe to the [development log](https://plugins.trac.wordpress.org/log/optisize-webp-konwerter/)
by [RSS](https://plugins.trac.wordpress.org/log/optisize-webp-konwerter/?limit=100&mode=stop_on_copy&format=rss).

## Changelog

#### 1.1.6

 * Fix: Removed remote resource calls in test files.
 * Fix: Added direct file access security checks.
 * Fix: Removed global constant overrides in tests.

#### 1.1.5

 * Fix: Addressed Plugin Check warnings.
 * Fix: Replaced unlink() with wp_delete_file().
 * Fix: Improved date handling with current_time().
 * Fix: Added caching for mime types query.

#### 1.1.4

 * Fix: Contributors update.
 * Fix: Admin styles enqueueing.
 * Fix: Security improvements (Sanitization & Escaping).
 * Fix: Test file cleanup.

#### 1.1.3

 * Renamed plugin to Optisize – WebP Konwerter.
 * Security improvements (escaping, direct access checks).
 * Fixed asset enqueueing in admin details.
 * Added batch processing for existing images.
 * Improved UI for the settings page.
 * Better error handling during conversion.

#### 1.0.0

 * Initial release with automatic WebP conversion on upload.

## Meta

 *  Version **1.1.6**
 *  Last updated **3 months ago**
 *  Active installations **Fewer than 10**
 *  WordPress version ** 5.0 or higher **
 *  Tested up to **6.9.4**
 *  PHP version ** 7.4 or higher **
 *  Language
 * [English (US)](https://wordpress.org/plugins/optisize-webp-konwerter/)
 * Tags
 * [compression](https://test.wordpress.org/plugins/tags/compression/)[gallery](https://test.wordpress.org/plugins/tags/gallery/)
   [images](https://test.wordpress.org/plugins/tags/images/)[Optimize](https://test.wordpress.org/plugins/tags/optimize/)
   [webp](https://test.wordpress.org/plugins/tags/webp/)
 *  [Advanced View](https://test.wordpress.org/plugins/optisize-webp-konwerter/advanced/)

## Ratings

No reviews have been submitted yet.

[Your review](https://wordpress.org/support/plugin/optisize-webp-konwerter/reviews/#new-post)

[See all reviews](https://wordpress.org/support/plugin/optisize-webp-konwerter/reviews/)

## Contributors

 *   [ Mateusz Krosnowski ](https://profiles.wordpress.org/krosnowksy/)

## Support

Got something to say? Need help?

 [View support forum](https://wordpress.org/support/plugin/optisize-webp-konwerter/)