Title: Sasim WebP Auto Converter
Author: Evgenii Sasim
Published: August 13, 2026
Last modified: August 13, 2026
---
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# Sasim WebP Auto Converter
By [Evgenii Sasim](https://profiles.wordpress.org/evgenij347/)
[Download](https://downloads.wordpress.org/plugin/sasim-webp-auto-converter.1.4.1.zip)
* [Details](https://wordpress.org/plugins/sasim-webp-auto-converter/#description)
* [Reviews](https://wordpress.org/plugins/sasim-webp-auto-converter/#reviews)
* [Installation](https://wordpress.org/plugins/sasim-webp-auto-converter/#installation)
* [Development](https://wordpress.org/plugins/sasim-webp-auto-converter/#developers)
[Support](https://wordpress.org/support/plugin/sasim-webp-auto-converter/)
## Description
**Sasim WebP Auto Converter** creates WebP copies of your JPEG and PNG uploads and**
automatically outputs them on the front end** — no theme code required.
#### Plug & play (enabled by default)
* Featured images (`the_post_thumbnail`)
* `wp_get_attachment_image()` output
* Images in post content, text widgets, and block widgets
* Responsive `` with WebP `` when sibling files exist
Disable under **Settings WebP Converter** if your theme uses custom image helpers.
#### Conversion
* Configurable WebP quality (0–100)
* Batch tool for existing media library images
* Prefers WebP URLs in `srcset` when a sibling `.webp` file exists
* Removes WebP siblings when the attachment is deleted
* Uses Imagick when available, falls back to GD
#### Requirements
* PHP 7.4+
* GD with WebP support (`imagewebp`) or Imagick with WebP support
#### Privacy
This plugin processes images **only on your server**. It does not collect, store,
or transmit personal data to external services. Batch conversion runs via authenticated
admin AJAX only.
### External services
This plugin **does not** connect to third-party services. Image conversion uses
your server’s GD or Imagick extension only.
## Screenshots
[⌊Settings page with status strip, quality slider, and batch conversion⌉⌊Settings
page with status strip, quality slider, and batch conversion⌉[
Settings page with status strip, quality slider, and batch conversion
[⌊Automatic WebP generation on upload⌉⌊Automatic WebP generation on upload⌉[
Automatic WebP generation on upload
[⌊WebP preferred in responsive srcset⌉⌊WebP preferred in responsive srcset⌉[
WebP preferred in responsive srcset
## Installation
#### From WordPress.org (after approval)
1. Go to **Plugins Add New**.
2. Search for **Sasim WebP Auto Converter**.
3. Click **Install Now**, then **Activate**.
#### Manual upload
1. Upload the `sasim-webp-auto-converter` folder to `/wp-content/plugins/`.
2. Activate the plugin through the **Plugins** menu in WordPress.
3. Open **Settings WebP Converter** to adjust quality or batch-convert existing images.
Front-end WebP output works automatically when plug & play is enabled (default).
## FAQ
### Does this delete my original JPEG or PNG files?
No. The plugin creates additional `.webp` files alongside the originals. With plug&
play enabled, browsers that support WebP receive `` markup automatically.
### Do I need to edit my theme?
No. Plug & play is on by default. Disable it in settings if your theme already outputs
custom `` elements and you want to avoid double processing.
### Will every visitor receive WebP images?
With plug & play enabled, the plugin outputs `` with a WebP ``
when sibling files exist. Browsers that support WebP load the smaller format; others
fall back to JPEG/PNG via the `` tag.
### What quality should I use?
80–85 is a good starting point for photographs. Lower values reduce file size but
may reduce visual quality. Re-run batch conversion after changing quality to regenerate
existing WebP files.
### Does it work on existing uploads?
Yes. Use **Generate WebP** on the settings page to process the media library in
batches.
### Does the plugin send data to external servers?
No. All conversion happens locally using PHP GD or Imagick. The batch tool uses
WordPress AJAX in the admin only.
### What happens on uninstall?
Plugin options are removed. Generated `.webp` files remain on disk so your site
keeps working; delete them manually if you no longer need them.
### Does it work with page builders and CDNs?
Plug & play enhances standard WordPress image output. Page builders that bypass
core APIs may need theme helpers (see plugin documentation). CDNs that serve your
uploads directory will serve `.webp` siblings when URLs point to them.
### Can I use this with other image optimization plugins?
Avoid running multiple plugins that both convert uploads to WebP or rewrite the
same image markup. Test on staging first.
### Which image formats are supported?
JPEG and PNG uploads are converted. SVG and GIF are not converted. WebP output requires
server support (GD `imagewebp` or Imagick).
### Multisite?
Each site has its own settings and media library. Network-activate if you want the
plugin available on all subsites.
## Reviews
There are no reviews for this plugin.
## Contributors & Developers
“Sasim WebP Auto Converter” is open source software. The following people have contributed
to this plugin.
Contributors
* [ Evgenii Sasim ](https://profiles.wordpress.org/evgenij347/)
[Translate “Sasim WebP Auto Converter” into your language.](https://translate.wordpress.org/projects/wp-plugins/sasim-webp-auto-converter)
### Interested in development?
[Browse the code](https://plugins.trac.wordpress.org/browser/sasim-webp-auto-converter/),
check out the [SVN repository](https://plugins.svn.wordpress.org/sasim-webp-auto-converter/),
or subscribe to the [development log](https://plugins.trac.wordpress.org/log/sasim-webp-auto-converter/)
by [RSS](https://plugins.trac.wordpress.org/log/sasim-webp-auto-converter/?limit=100&mode=stop_on_copy&format=rss).
## Changelog
#### 1.4.1
* WordPress.org directory slug `sasim-webp-auto-converter` (display name: Sasim
WebP Auto Converter)
* Prefixed functions, options, AJAX actions, and admin script handles (`saswac_*`)
* Redesigned settings page: status strip, postbox sections, batch progress bar
* Quality slider with synced number input
* For developers section with theme helpers documentation link
* Batch AJAX progress fields: total, processed, converted_batch
* Tested up to WordPress 7.1
#### 1.3.0
* Plug & play mode: auto-enhance featured images, attachment images, and content(
on by default)
* Settings toggle to disable front-end auto output
* Developer filters: `saswac_auto_output_enabled`, `saswac_should_auto_output`,`
saswac_default_sizes_attr`
#### 1.2.1
* WordPress-native helpers without ACF: featured image, post meta, options, wp_attachment_image
drop-in
#### 1.2.0
* Theme helper functions for responsive `` WebP output (`saswac_*`)
* Optional `the_content` filter (disabled by default)
* Documentation: docs/theme-helpers.md
#### 1.1.0
* WordPress.org release pack: readme, uninstall cleanup, i18n text domain
* Batch regeneration for existing media library images
* Imagick support with GD fallback
* WebP cleanup on attachment delete
#### 1.0.0
* Initial release: upload conversion, srcset WebP preference, settings page
## Meta
* Version **1.4.1**
* Last updated **1 day ago**
* Active installations **Fewer than 10**
* WordPress version ** 5.8 or higher **
* Tested up to **7.1**
* PHP version ** 7.4 or higher **
* Tags
* [images](https://wordpress.org/plugins/tags/images/)[media](https://wordpress.org/plugins/tags/media/)
[optimization](https://wordpress.org/plugins/tags/optimization/)[performance](https://wordpress.org/plugins/tags/performance/)
[webp](https://wordpress.org/plugins/tags/webp/)
* [Advanced View](https://wordpress.org/plugins/sasim-webp-auto-converter/advanced/)
## Ratings
No reviews have been submitted yet.
[Your review](https://wordpress.org/support/plugin/sasim-webp-auto-converter/reviews/#new-post)
[See all reviews](https://wordpress.org/support/plugin/sasim-webp-auto-converter/reviews/)
## Contributors
* [ Evgenii Sasim ](https://profiles.wordpress.org/evgenij347/)
## Support
Got something to say? Need help?
[View support forum](https://wordpress.org/support/plugin/sasim-webp-auto-converter/)