Title: Byteslim Image Optimizer
Author: WP Developer Hub
Published: August 16, 2026
Last modified: August 16, 2026
---
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# Byteslim Image Optimizer
By [WP Developer Hub](https://profiles.wordpress.org/wpdh1707/)
[Download](https://downloads.wordpress.org/plugin/byteslim-image-optimizer.1.2.1.zip)
* [Details](https://wordpress.org/plugins/byteslim-image-optimizer/#description)
* [Reviews](https://wordpress.org/plugins/byteslim-image-optimizer/#reviews)
* [Installation](https://wordpress.org/plugins/byteslim-image-optimizer/#installation)
* [Development](https://wordpress.org/plugins/byteslim-image-optimizer/#developers)
[Support](https://wordpress.org/support/plugin/byteslim-image-optimizer/)
## Description
Byteslim Image Optimizer makes your site faster by compressing images and serving
next-generation formats — without changing how you work. New uploads are optimized
automatically, and you can process your whole library in a few clicks.
Built for performance: it prefers Imagick, falls back to GD when the host restricts
it, only overwrites a file when the result is genuinely smaller, and processes large
libraries in memory-efficient batches that resume if interrupted.
**WebP the way you want it**
Choose how WebP is delivered in Settings:
* **Replace (recommended)** — the media file itself becomes WebP, so your Media
Library shows `.webp`. The original JPG/PNG is kept and can be restored in one
click.
* **Serve alongside** — the original file is never changed; WebP is delivered on
the front end via a `` tag with automatic fallback.
**Free features**
* JPEG & PNG compression (lossless PNG, transparency preserved)
* Adjustable quality, metadata stripping, progressive JPEG
* Optimize the full image and every thumbnail size
* WebP conversion with Replace or serve-alongside delivery
* One-click “Restore original” for any WebP-replaced image
* Bulk optimizer with a progress bar that resumes after interruption
* Media Library “Optimize” action, bulk actions and status column
* Statistics dashboard (images optimized, space saved, compression ratio, health)
* Server status: server, PHP, WebP/AVIF and host/CDN detection
* Activity & error logs
* WP-CLI commands and a read-only REST API
* Translation ready
**Premium features**
Byteslim Image Optimizer Premium adds automatic scaling of oversized images (resize
huge originals down to a maximum you choose, thumbnails rebuilt, original kept restorable),
lazy loading with blur-up placeholders and Largest Contentful Paint protection,
server-level WebP/AVIF delivery across the whole site (theme and CSS-background
images, via .htaccess or an Nginx snippet), AI-generated alt text for accessibility
and SEO (bring your own key), media cleanup (find duplicate images and broken records
to reclaim space), AVIF conversion, backup & one-click restore of originals, background
queue processing, scheduled optimization, WooCommerce/Elementor/Gutenberg/page-builder
delivery, advanced analytics and an image health report, and a REST write API.
Premium is available as a low yearly price or a one-time lifetime licence (1, 5
or unlimited sites) — unlimited images, no per-image credits and no bandwidth limits,
because it all runs on your own server. Full feature comparison, documentation and
licensing: [wpdeveloperhub.com/byteslim-image-optimizer](https://wpdeveloperhub.com/byteslim-image-optimizer.html)
This free plugin makes no external service calls.
## Screenshots
[⌊Dashboard — images optimized, disk space saved and compression ratio, with coverage
meters and an image-health summary.⌉⌊Dashboard — images optimized, disk space saved
and compression ratio, with coverage meters and an image-health summary.⌉[
Dashboard — images optimized, disk space saved and compression ratio, with coverage
meters and an image-health summary.
[⌊Settings — compression quality, WebP mode (Replace in the Media Library, or serve
alongside via a picture tag) and delivery options.⌉⌊Settings — compression quality,
WebP mode (Replace in the Media Library, or serve alongside via a picture tag) and
delivery options.⌉[
Settings — compression quality, WebP mode (Replace in the Media Library, or serve
alongside via a picture tag) and delivery options.
[⌊Bulk Optimize — process your entire Media Library with a live progress bar that
resumes if you close the tab.⌉⌊Bulk Optimize — process your entire Media Library
with a live progress bar that resumes if you close the tab.⌉[
Bulk Optimize — process your entire Media Library with a live progress bar that
resumes if you close the tab.
[⌊Media Library — per-image "Optimize" action, an Optimization status column and
multi-select bulk actions.⌉⌊Media Library — per-image "Optimize" action, an Optimization
status column and multi-select bulk actions.⌉[
Media Library — per-image “Optimize” action, an Optimization status column and multi-
select bulk actions.
[⌊A WebP-replaced image in the Media Library, showing the kept "Original image"
and the one-click "Restore original" action.⌉⌊A WebP-replaced image in the Media
Library, showing the kept "Original image" and the one-click "Restore original"
action.⌉[
A WebP-replaced image in the Media Library, showing the kept “Original image” and
the one-click “Restore original” action.
[⌊Server Status — WebP/AVIF support, PHP, memory and web-server/CDN detection.⌉⌊
Server Status — WebP/AVIF support, PHP, memory and web-server/CDN detection.⌉[
Server Status — WebP/AVIF support, PHP, memory and web-server/CDN detection.
[⌊Logs — a clear activity and error log for every optimization.⌉⌊Logs — a clear
activity and error log for every optimization.⌉[
Logs — a clear activity and error log for every optimization.
## Installation
1. Upload the plugin to `/wp-content/plugins/byteslim-image-optimizer`, or install
it from the Plugins screen.
2. Activate the plugin.
3. Go to **Image Optimizer Settings** and choose your options.
4. Use **Image Optimizer Bulk Optimize** to process images already in your library.
## FAQ
### Why does my Media Library show .webp after optimizing?
That is Replace mode (the default). The media file is converted to WebP and the
original JPG/PNG is kept as a restorable backup — you’ll see an “Original image”
link on the attachment. Prefer to keep the original file untouched? Switch **Settings
WebP mode** to “Serve alongside”.
### Will optimization damage my images?
No. A file is only replaced when the optimized version is actually smaller, PNG
compression is lossless, and the original is always kept so you can restore it.
### My server does not support WebP or AVIF. What happens?
Those conversions are skipped automatically and compression still works. Check **
Image Optimizer Server Status** to see what your server supports.
### Does it work with WooCommerce and page builders?
Compression and WebP conversion work for every image. Serving next-gen formats inside
WooCommerce, Elementor, Gutenberg blocks and page builders is a Premium feature.
### Can I run it from the command line?
Yes: `wp bslim status`, `wp bslim stats`, `wp bslim optimize `, `wp bslim bulk`,
and `wp bslim reset`.
## Reviews
There are no reviews for this plugin.
## Contributors & Developers
“Byteslim Image Optimizer” is open source software. The following people have contributed
to this plugin.
Contributors
* [ WP Developer Hub ](https://profiles.wordpress.org/wpdh1707/)
[Translate “Byteslim Image Optimizer” into your language.](https://translate.wordpress.org/projects/wp-plugins/byteslim-image-optimizer)
### Interested in development?
[Browse the code](https://plugins.trac.wordpress.org/browser/byteslim-image-optimizer/),
check out the [SVN repository](https://plugins.svn.wordpress.org/byteslim-image-optimizer/),
or subscribe to the [development log](https://plugins.trac.wordpress.org/log/byteslim-image-optimizer/)
by [RSS](https://plugins.trac.wordpress.org/log/byteslim-image-optimizer/?limit=100&mode=stop_on_copy&format=rss).
## Changelog
#### 1.2.1
* Hardening: every admin screen now escapes its output at the point of output,
including the inline SVG icons, which are filtered through a strict allowlist.
* The “leave a review” link now opens the plugin’s full reviews page instead of
a pre-filtered five-star form, so all feedback is visible.
#### 1.2.0
* The plugin is now named Byteslim Image Optimizer. Settings, statistics, optimization
history and licence activation are migrated automatically on upgrade — nothing
needs to be re-entered.
* Note: the admin menu now lives under Byteslim, so any bookmarks to the old settings
URL need updating.
#### 1.1.1
* Fix: attachments left labelled the wrong file type by other optimizers (a .webp/.
avif stored as image/jpeg) are now corrected automatically on upgrade and when
processed, so they stop being queued as images that can never be optimized.
* Fix: Bulk Optimize now reports optimized, skipped and failed counts separately—
images that were already done or unsupported are no longer counted as fresh work.
* Fix: when the server cannot generate AVIF, it is skipped with a clear logged
reason instead of recording empty coverage.
* Fix: image markup is left untouched on AMP pages, which do not allow the element.
* Tweak: author footer logo now sits on a rounded white background so it stays
visible.
* Tweak: refreshed the premium features overview shown to free users.
* Compatibility: marked tested up to WordPress 7.1. Server-side optimization works
alongside 7.1’s client-side media processing (the plugin optimizes whatever file
arrives and falls back cleanly).
#### 1.1.0
* New: WebP “Replace” mode (default) — the media file itself becomes WebP so the
Media Library shows `.webp`, while the original JPG/PNG is kept and fully restorable.
* New: “Restore original” action in the Media Library for WebP-replaced images.
* New: WebP mode setting (Replace / Serve alongside).
* New: redesigned admin — branded header, KPI cards, coverage meters, image-health
panel and author footer.
* Fix: images that failed to encode were incorrectly marked as optimized, which
made a re-run of Bulk Optimize do nothing. Failures are now retried and recorded
with a reason, and a failed count is shown.
* Fix: added a GD fallback when Imagick is blocked by host policy/resource limits,
so large JPEGs no longer fail silently.
* Fix: unified how “optimized” is counted across the dashboard, the bulk job and
the statistics.
* Fix: removed a byte-order mark that produced an “unexpected output” / “headers
already sent” warning on activation.
* Fix: the log table now self-heals if it is missing.
#### 1.0.0
* Initial release: compression, WebP conversion & delivery, bulk optimizer with
resume, statistics dashboard, system/CDN detection, logs, WP-CLI and REST API.
## Meta
* Version **1.2.1**
* Last updated **5 hours ago**
* Active installations **Fewer than 10**
* WordPress version ** 5.8 or higher **
* Tested up to **7.1**
* PHP version ** 7.4 or higher **
* Tags
* [AVIF](https://wordpress.org/plugins/tags/avif/)[compress images](https://wordpress.org/plugins/tags/compress-images/)
[image optimization](https://wordpress.org/plugins/tags/image-optimization/)[performance](https://wordpress.org/plugins/tags/performance/)
[webp](https://wordpress.org/plugins/tags/webp/)
* [Advanced View](https://wordpress.org/plugins/byteslim-image-optimizer/advanced/)
## Ratings
No reviews have been submitted yet.
[Your review](https://wordpress.org/support/plugin/byteslim-image-optimizer/reviews/#new-post)
[See all reviews](https://wordpress.org/support/plugin/byteslim-image-optimizer/reviews/)
## Contributors
* [ WP Developer Hub ](https://profiles.wordpress.org/wpdh1707/)
## Support
Got something to say? Need help?
[View support forum](https://wordpress.org/support/plugin/byteslim-image-optimizer/)