Description
Flex Image Optimizer is part of the FLEX plugin suite from FLEX LLC (https://flexible.am/). It keeps image work on your WordPress server. There is no compression API, no CDN account, and no call home.
- Bulk regenerate all thumbnail sizes, or only missing sizes
- Generate WebP (and optional AVIF) copies next to JPEG/PNG files
- Serve modern formats with a picture tag so JPEG/PNG remains the fallback
- Allow SVG uploads with sanitization (scripts and unsafe markup removed)
- Resize oversized originals, set JPEG/WebP quality, and strip GPS/EXIF
- Skip unused registered sizes (including 1536×1536 / 2048×2048)
- Media library column, row actions, bulk actions (up to 20), and WP-CLI
Admin CSS and JavaScript ship with the plugin. No remote stylesheets, no telemetry.
Privacy
Flex Image Optimizer does not send images or metadata to FLEX or any third-party service. Processing uses the WordPress image editor (Imagick or GD) on this site. Optional EXIF stripping is done on the server. SVG sanitization runs on upload before the file is stored.
Limitations
- WebP and AVIF require PHP/GD or Imagick built with those formats.
- Animated GIF is not converted.
- Picture-tag rewriting wraps
imgtags. CSS that requiresimgto be a direct child of another element may need a small adjustment. - SVG is treated like HTML: only trust roles you allow to upload it.
- This is not a CDN, lazy-load extra, or offsite backup plugin.
Screenshots
Installation
- Upload the
flex-image-optimizerfolder to/wp-content/plugins/, or install the zip via Plugins Add New Upload Plugin. - Activate Flex Image Optimizer.
- Open Flex Images Settings and review WebP, SVG, and quality.
- Open Tools to generate WebP for the existing library or regenerate thumbnails.
FAQ
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Where are WebP files stored?
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Next to the original, with an extra extension:
photo.jpg.webp. Thumbnails follow the same pattern. Deleting the media item removes those copies. Uninstalling the plugin does not. -
Will visitors without WebP support see a broken image?
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No. The original JPEG or PNG stays in the
imgtag. Supporting browsers pick WebP or AVIF from the picture sources. -
Is SVG safe?
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The plugin strips scripts, event handlers, foreignObject, and external URLs. That is not a guarantee against every XML trick. Keep SVG limited to administrators unless you trust the other roles.
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Can I regenerate one image?
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Yes. In the media library, hover the row and use Regenerate thumbnails or Generate WebP. Bulk actions handle up to 20 selected items.
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What happens when I uninstall?
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Plugin settings are removed. Uploaded images and generated WebP/AVIF files stay in the uploads directory.
Reviews
There are no reviews for this plugin.
Contributors & Developers
“Flex Image Optimizer” is open source software. The following people have contributed to this plugin.
Contributors
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Interested in development?
Browse the code, check out the SVN repository, or subscribe to the development log by RSS.
Changelog
1.0.1
- Remove the deprecated libxml entity loader call. SVG parsing still rejects entities and blocks network access.
- Load image functions from image.php only.
1.0.0
- Initial release.