Bulk image optimization
Convert the whole WordPress Media Library, selected uploads folders, or selected folders inside the active theme in bulk.
Free local image optimization for WordPress
WordPress Image Optimizer for WebP & AVIF
Convert JPG and PNG images to WebP and AVIF directly on your WordPress server. No API key, external image CDN, subscription, or paid feature tier. Original files stay unchanged.
Free with no paid feature tiers
No API key or external image CDN
Original JPG and PNG stay unchanged
VeloIMG control layer
0.9.3
Originals
unchanged
WebP
separate queue
AVIF
own results
Delivery strategy
AVIF -> WebP -> original
WebP
bulk generation and delivery
AVIF
separate processing and statistics
0
changes to source JPG/PNG files
How it works
Convert WordPress images to WebP and AVIF without changing originals
VeloIMG performs local WordPress image conversion on your own hosting, stores WebP and AVIF derivatives separately, validates the result, and keeps the original JPG or PNG as the final fallback.
01
JPG / PNG
Source images remain untouched.
02
WebP
Generated separately with progress, pause, and statistics.
03
AVIF
Created as a separate process and not mixed with WebP.
04
Frontend
PHP Safe or Apache/LiteSpeed delivers the suitable format.
Features
WordPress image optimization features
Optimize existing WordPress images locally without sending files to a third-party optimization platform. Generate modern formats in bulk, verify results, and enable frontend delivery when the site is ready.
WebP and AVIF conversion
Each format has its own section, progress, statistics, and reasons for skipped files.
Pause and resume bulk conversion
Large media libraries can be processed in iterations without losing completed progress.
Frontend image delivery diagnostics
Check one site URL and see what a real visitor receives.
Safe conversion rules
The plugin does not save a derivative when the result is larger than the original or when transparency could be lost.
Media Library and file control
Folder statistics, file lists, archive export, and safe removal of generated derivatives.
Frontend delivery
WebP and AVIF delivery for WordPress
PHP Safe
Adds picture/source markup in WordPress. It works on most hosting environments, but some themes may need CSS adjustments for picture.
<picture>
<source srcset="image.jpg.avif" type="image/avif">
<source srcset="image.jpg.webp" type="image/webp">
<img src="image.jpg" alt="">
</picture>Apache / LiteSpeed
Uses rules in uploads/.htaccess and serves AVIF/WebP through browser Accept headers when the server supports it.
Browser request
Accept header
Apache/LiteSpeed
AVIF / WebP / Original
- Does not add picture/source to the page HTML.
- Works when the server allows rules in uploads/.htaccess.
- The plugin manages only its own marker block and does not rewrite other rules.
Interface
Manage WordPress WebP and AVIF optimization from one interface
See real bulk WebP and AVIF conversion, Media Library statistics, frontend delivery diagnostics, and clear reasons for files that are skipped or not saved.
Delivery strategy
Dashboard
Check server readiness, choose the delivery mode, and define frontend format priority.
- WebP and AVIF status
- Frontend delivery mode
- Format priority
Media Library and theme folders
WebP generation
Start processing, pause generation, and review savings, queue state, and reasons for unsuccessful files.
- Whole Media Library or folder
- Progress and pause
- Savings summary
Separate AVIF process
AVIF generation
AVIF runs as a parallel branch with its own settings, results, and skipped-file reasons.
- Separate statistics
- Unsuccessful file reasons
- Quality control
What the visitor receives
URL check
Check any site page and inspect AVIF/WebP coverage, file availability, and fallback behavior.
- Single page check
- Format coverage
- Fallback diagnostics
Result control
Folder statistics
Open uploads folders, sort files by size, and review hints for skipped-file reasons.
- Uploads folders
- Sort by file size
- Reason hints
Server checklist
WordPress image optimizer requirements
- WordPress 6.9 or newer
- PHP 7.4 or newer
- Imagick or GD with WebP support
- Imagick or GD with AVIF support for AVIF generation
- Writable uploads directory
- WP-Cron or server cron for reliable background processing
Questions
WordPress image optimization FAQ
Is VeloIMG a free WordPress image optimizer?
Yes. All current VeloIMG features are available free, with no account, subscription, API key, or paid feature tier.
Does VeloIMG need an API key, image CDN, or cloud optimization service?
No. WebP and AVIF generation runs locally on your WordPress hosting through Imagick or GD, and frontend delivery does not require an external image CDN or third-party optimization platform.
Can VeloIMG convert existing WordPress Media Library images to WebP and AVIF?
Yes. Bulk generation can process the full Media Library, selected uploads folders, and selected active-theme folders. WebP and AVIF are handled as separate generation flows.
Does VeloIMG change original JPG and PNG images?
No. Source JPG and PNG files stay in place. The plugin creates WebP and AVIF derivatives in separate storage inside uploads and keeps the original image as a fallback.
Why can some WebP or AVIF files be skipped?
The plugin intentionally does not save a result when the derivative is larger than the original, the source cannot be read, the generated file is invalid, or AVIF conversion would lose PNG transparency.
Can bulk WebP or AVIF conversion be paused and continued later?
Yes. Bulk processing can be stopped and continued without re-processing files that were already completed unless the generated files are deleted or regenerated.
How does VeloIMG serve WebP and AVIF images in WordPress?
PHP Safe adds picture/source markup so the browser can choose a supported format. Apache/LiteSpeed keeps HTML unchanged and serves generated files through server rules according to the browser Accept header and the selected fallback strategy.
What should I do after changing the image delivery mode?
Clear the page cache and use the built-in frontend URL check to verify WebP and AVIF coverage, derivative availability, and fallback behavior for visitors.
Release
Download the free VeloIMG WordPress image optimizer
VeloIMG 0.9.3 is available free in the official WordPress plugin directory. Install it from WordPress.org or search for VeloIMG under Plugins -> Add New in WordPress.
Current version: 0.9.3
Open WordPress.org listing
Contact
Contact and feedback
For questions and feedback, use the form, email, or Telegram. If you describe a technical issue, include only details you are comfortable sharing.
Changelog
Version history
Localization compliance hotfix
- Fixed source-language localization so English and untranslated locales no longer show Russian fallback labels.
- Corrected JavaScript translation helper names so internal UI keys are not extracted as WordPress.org source strings.
- Corrected the folder-history "Show more" source string and AVIF stale-run localization mapping.
- Rebuilt the bundled Russian translation after the source-language cleanup.
- Aligned translation loading with WordPress just-in-time language packs so official WordPress.org language packs take priority over the bundled fallback.
- Removed obsolete translation-build and no-op admin leftovers from the release package.
- No WebP/AVIF generation, delivery, queue, or statistics behavior was changed in this hotfix.
Bulk generation reliability and statistics
- Improved reliability of WebP and AVIF bulk generation for large uploads libraries.
- Preserved stopped-folder status across folder and full-library runs for both WebP and AVIF.
- Fixed AVIF all-media folder statistics so active monthly folders show current processed counts.
- Improved Start, Stop, Continue, transition recovery, and stale-request protection for AVIF bulk runs.
- Improved uploads-folder and all-media statistics based on physical generated derivatives.
- Improved exact uploads file identity handling, including case-sensitive paths.
- Improved cleanup of VeloIMG runtime data and run-manifest data on uninstall.
- Updated WordPress compatibility and release metadata.
- Documented the bundled Russian translation (ru_RU).
Test generation UX update
- Fixed AVIF test generation so the button becomes available after selecting a file.
- Unified detailed WebP and AVIF test results with file status, size, savings, and reason details.
- Added and corrected Russian translations for test generation messages.
First public release
- Separate WebP and AVIF sections.
- AVIF/WebP/original delivery strategies.
- PHP Safe and Apache/LiteSpeed modes.
- Server, frontend, and derivative-file diagnostics.
- Folder statistics, archive export, and safe derivative removal.