Title: Kitgenix Image Optimizer
Author: Kitgenix
Published: 16. 6. 2026
Last modified: 31. 8. 2026
---
Prohledat pluginy
# Kitgenix Image Optimizer
Autor: [Kitgenix](https://profiles.wordpress.org/kitgenix/)
[Stáhnout](https://downloads.wordpress.org/plugin/kitgenix-image-optimizer.2.0.0.zip)
* [Podrobnosti](https://cs.wordpress.org/plugins/kitgenix-image-optimizer/#description)
* [Hodnocení](https://cs.wordpress.org/plugins/kitgenix-image-optimizer/#reviews)
* [Instalace](https://cs.wordpress.org/plugins/kitgenix-image-optimizer/#installation)
* [Vývojáři](https://cs.wordpress.org/plugins/kitgenix-image-optimizer/#developers)
[Podpora](https://wordpress.org/support/plugin/kitgenix-image-optimizer/)
## Popis
**Kitgenix Image Optimizer** is a local WordPress image optimization plugin for
compressing Media Library images, resizing oversized uploads and creating modern
WebP or AVIF sidecar files without sending image files to a remote compression API.
Image processing runs through WordPress’s `WP_Image_Editor` layer using the image
library available on the server, normally GD or Imagick. New uploads can be optimized
automatically, while existing media can be processed through a persistent background
queue or WP-CLI.
The plugin is designed for WordPress sites and WooCommerce stores that want image
compression, size reduction and modern-format delivery without per-image credits
or an external image-processing account.
Learn more about Kitgenix at [Kitgenix](https://kitgenix.com/).
#### WordPress Image Optimization Features
* Local JPEG, PNG, WebP, GIF and AVIF optimization when supported by the active
WordPress image editor.
* Automatic optimization after WordPress generates attachment metadata and registered
image sizes.
* Persistent bulk queue for existing Media Library images.
* Bulk optimize or force re-optimize modes.
* Pause, resume, stop and retry-failed queue controls.
* WP-Cron background continuation so the browser does not need to remain open.
* Compression presets plus custom JPEG, PNG, WebP and AVIF quality controls.
* Maximum width/height integration with WordPress’s `big_image_size_threshold`
behaviour.
* Optional WebP and AVIF sidecar generation for JPEG/PNG source images.
* Frontend `` delivery when corresponding sidecars exist.
* Optional metadata stripping.
* Optional optimization of generated thumbnails/sub-sizes.
* Optional original-image backups and restore workflow.
* Optional native `loading` attribute management for frontend images.
* Animated GIF protection.
* Exclusions by MIME type, file size, dimensions, filename pattern, attachment
ID and uploads-relative directory.
* File/pixel/memory safety checks before expensive image decoding.
* Atomic file replacement to reduce corruption risk if processing is interrupted.
* „Do not replace with a larger file“ protection.
* Media Library status/savings information and per-image actions.
* Aggregate optimization statistics with manual recalculation.
* Diagnostics and WordPress Site Health integration.
* Capped local activity/error log.
* REST capability/status endpoints.
* WP-CLI commands for optimization, queue control, status, statistics and restore.
#### Local Processing: No Image Optimization API Required
The source image and generated image files remain on the WordPress server. The optimizer
asks WordPress for an appropriate image editor, processes the file locally and writes
the result back to the uploads directory.
There is no Kitgenix compression service and no requirement to upload images to
a third-party optimization API. That avoids per-image quotas and keeps the actual
image-processing data flow within the site/hosting environment.
#### Automatic Upload Optimization
When automatic optimization is enabled, the plugin hooks into WordPress attachment-
metadata generation after WordPress has created registered image sizes. This lets
the plugin work with the final master/sub-size set rather than racing the core thumbnail-
generation process.
Per-file fingerprints are used so regenerating attachment metadata does not automatically
mean every unchanged file must be recompressed again.
#### Compression Presets and Custom Quality
Administrators can choose a preset compression profile or use custom format settings.
The code supports configurable JPEG quality, PNG compression level, WebP quality
and AVIF quality, subject to what the server’s active image editor can actually
encode.
Modern-format options are capability-gated. If WordPress reports that the active
server/editor cannot encode WebP or AVIF, the relevant functionality is not treated
as available simply because a checkbox exists.
#### WebP and AVIF Sidecars
For JPEG/PNG source images, optional `.webp` and `.avif` sidecars can be generated
alongside the original file. The original source remains the fallback.
When sidecar delivery is enabled and the corresponding sidecar files exist, frontend
image markup can be wrapped in a `` element containing AVIF and/or WebP`
` elements. AVIF is placed before WebP where both are available so a capable
browser can choose the first supported modern format.
The delivery logic only rewrites images that resolve within the site’s WordPress
uploads directory. Remote images are not rewritten as if local sidecar files existed.
#### Resizing Oversized Images
Configured maximum dimensions integrate with WordPress’s big-image threshold so
the site does not unnecessarily perform one resize in WordPress core and a second
independent resize in the plugin.
The optimizer preserves aspect ratio and relies on the active WordPress image editor
for the actual image operation.
#### Metadata Stripping
Optional metadata stripping can remove image metadata during processing where supported
by the active editor. This can reduce file size and may remove embedded EXIF/GPS
information from images that are rewritten.
Because metadata requirements differ between sites, administrators should keep this
disabled if they need embedded camera/copyright/location metadata to remain in optimized
derivatives.
#### Backups and Restore
If **Backup Originals** is enabled before optimization, the plugin can retain an
original backup file. A per-image restore action and WP-CLI restore command can
put that backup back in place.
Restoring a master image regenerates WordPress attachment metadata and sub-sizes
so the database dimensions and generated files stay aligned with the restored source.
Backup deletion on uninstall is separately configurable. Media Library originals
are never treated as disposable plugin settings data.
#### Bulk Optimization Queue
Large libraries are handled through persisted queue state rather than one giant
admin request. The queue can be started in normal bulk mode or re-optimization mode,
paused, resumed, stopped and asked to retry failed items.
A scheduled background runner continues processing queue batches after the administrator
leaves the page. The admin interface can poll queue status and display processed/
failed counts without requiring one PHP request to remain open for the entire library.
#### Exclusion Rules
The code includes exclusions for:
* Files below a minimum size.
* Files above a maximum size.
* Filename patterns.
* MIME types.
* Minimum width/height thresholds.
* Maximum width/height thresholds.
* Specific attachment IDs.
* Upload-directory path fragments.
Animated GIFs can also be skipped to avoid destroying animation during normal still-
image processing.
#### Image Safety and Atomic Writes
Before decoding an image, the guard can consider file size, pixel dimensions and
estimated memory requirements. This is intended to reject obviously unsafe or resource-
exhausting image inputs before GD/Imagick attempts a costly decode.
Optimized output is written to a temporary file and verified before it replaces
the existing file. If the newly generated file is not actually smaller than the
original, the optimized candidate can be discarded so „optimization“ does not make
the asset larger.
#### Lazy Loading
An optional frontend lazy-loading layer can add native `loading` attributes to `
` elements that do not already declare one. The first image is left eager to
avoid automatically delaying the likely Largest Contentful Paint candidate, while
later images can receive `loading="lazy"`.
The lazy-loading processor skips admin and other unsuitable contexts and does not
overwrite an existing loading attribute.
#### Media Library and Attachment Tools
The Media Library receives optimization status/savings information and per-image
controls. An attachment panel provides additional context for a selected image,
and administrators can trigger single-image optimization or restore where permitted.
AJAX actions require both the plugin-level media capability and permission to edit
the individual attachment.
#### Diagnostics and Site Health
Diagnostics report GD/Imagick availability and versions, preferred WordPress image
editor, PHP memory information and encode/decode support for relevant formats. Site
Health exposes the same capability picture and can warn when a feature such as WebP/
AVIF conversion is enabled but the server cannot perform that conversion.
Optimization failure counts and queue status are also available for troubleshooting.
#### REST API
The plugin registers authenticated/read-only diagnostic routes under:
```
kitgenix-image-optimizer/v1
```
Routes provide status and capability information. They are intended for administration/
diagnostics rather than remote image upload or third-party compression.
#### WP-CLI
The command base is:
```
wp kitgenix-optimizer
```
The code includes commands for server/queue status, optimizing all eligible images
or a single attachment, forced re-optimization, statistics, backup restore and queue
actions (`start`, `pause`, `resume`, `stop`, `retry`, `status`).
#### Privacy and Storage
Images are processed locally. Plugin settings, queue state, statistics, logs and
per-image optimization metadata are stored in WordPress. Optional backup and sidecar
files are stored in the site’s uploads area.
The shared Kitgenix admin Hub can request public plugin-directory data from WordPress.
org, and the admin stylesheet imports disclosed Google Fonts. Neither service receives
image files for optimization.
#### Typical Uses
* Reduce image file sizes on a content-heavy WordPress site.
* Optimize WooCommerce product imagery without a per-image SaaS plan.
* Convert supported JPEG/PNG uploads to WebP/AVIF sidecars.
* Process an existing Media Library in resumable batches.
* Preserve recoverability by creating local original backups before optimization.
* Diagnose whether a host can actually encode WebP or AVIF.
* Automate image maintenance with WP-CLI.
### External Services
**WordPress.org Plugins API:** When an authorized administrator opens the shared
Kitgenix Hub, WordPress core `plugins_api()` retrieves public Kitgenix plugin metadata.
Requests use plugin slugs, are cached for up to 24 hours, and do not send images.
Service: https://wordpress.org/plugins/ – Privacy: https://wordpress.org/about/privacy/
**Google Fonts:** Kitgenix admin CSS imports Inter and Manrope on screens where
it is loaded, so the administrator’s browser may send connection data such as an
IP address to Google. Service: https://fonts.google.com/ – Privacy: https://policies.
google.com/privacy – Terms: https://policies.google.com/terms
No image is sent to either service for optimization.
## Snímky obrazovky
[⌊Settings screen for compression presets, custom JPEG/PNG/WebP/AVIF quality, resizing,
and metadata stripping.⌉⌊Settings screen for compression presets, custom JPEG/PNG/
WebP/AVIF quality, resizing, and metadata stripping.⌉[
Settings screen for compression presets, custom JPEG/PNG/WebP/AVIF quality, resizing,
and metadata stripping.
[⌊Images tab showing stats.⌉⌊Images tab showing stats.⌉[
Images tab showing stats.
[⌊Diagnostics tab reporting GD/Imagick availability, encode/decode support, and
PHP memory limits.⌉⌊Diagnostics tab reporting GD/Imagick availability, encode/decode
support, and PHP memory limits.⌉[
Diagnostics tab reporting GD/Imagick availability, encode/decode support, and PHP
memory limits.
[⌊Media Library optimization status, savings information, and per-image restore
actions.⌉⌊Media Library optimization status, savings information, and per-image
restore actions.⌉[
Media Library optimization status, savings information, and per-image restore actions.
[⌊Log tab with searchable, paginated activity and error history.⌉⌊Log tab with searchable,
paginated activity and error history.⌉[
Log tab with searchable, paginated activity and error history.
## Instalace
1. Install and activate **Kitgenix Image Optimizer**.
2. Open **Kitgenix Image Optimizer Settings** and configure compression, resizing,
WebP/AVIF, backups, lazy loading, and exclusions.
3. Use **Images** for existing files and **Diagnostics** to check GD/Imagick and format
support.
## Nejčastější dotazy
### Does it require an image optimization API?
No. Processing is local through WordPress `WP_Image_Editor`. See **External Services**
for non-image admin requests.
### Can I bulk-optimize and restore images?
Yes. The queue supports optimization, re-optimization, pause/resume, and failed-
item retry. Restore is available when **Backup Originals** was enabled before optimization.
## Recenze
Pro tento plugin nejsou žádné recenze.
## Autoři
Kitgenix Image Optimizer je otevřený software. Následující lidé přispěli k vývoji
tohoto pluginu.
Spolupracovníci
* [ Kitgenix ](https://profiles.wordpress.org/kitgenix/)
[Přeložte “Kitgenix Image Optimizer” do svého jazyka.](https://translate.wordpress.org/projects/wp-plugins/kitgenix-image-optimizer)
### Zajímá vás vývoj?
[Prohledejte kód](https://plugins.trac.wordpress.org/browser/kitgenix-image-optimizer/),
podívejte se do [SVN repozitáře](https://plugins.svn.wordpress.org/kitgenix-image-optimizer/),
nebo se přihlaste k[ odběru protokolu vývoje](https://plugins.trac.wordpress.org/log/kitgenix-image-optimizer/)
pomocí [RSS](https://plugins.trac.wordpress.org/log/kitgenix-image-optimizer/?limit=100&mode=stop_on_copy&format=rss).
## Přehled změn
#### 2.0.0 (31 August 2026)
* New: Added per-file change fingerprinting so thumbnail regeneration only re-compresses
image files that have actually changed instead of repeatedly processing every
existing file.
* New: Added AVIF conversion alongside the existing WebP conversion feature.
* New: WebP and AVIF conversion options are now gated by live `wp_image_editor_supports()`
capability checks, preventing unsupported conversion settings from appearing
on servers that cannot encode the selected format.
* New: Added a Diagnostics tab showing GD and Imagick availability and versions,
active image editor information, JPEG/PNG/GIF/WebP/AVIF encode and decode support,
PHP memory and upload limits, and recent optimisation failure counts.
* New: Added matching WordPress Site Health diagnostics for the image editor environment
and supported image formats.
* New: Rebuilt the bulk optimiser as a persisted, resumable processing queue with
pause, resume, and „Retry Failed“ controls.
* New: Added scheduled background processing for the bulk optimisation queue so
processing can continue after the administrator closes the browser tab.
* New: Expanded optimisation exclusion rules to support MIME type, minimum and
maximum file size, minimum and maximum image dimensions, specific attachment
IDs, and upload directories in addition to the existing minimum-size threshold
and filename-pattern exclusions.
* New: Added a dedicated Uninstall settings section with explicit „Keep Settings&
Data“ and „Delete Backup Files on Uninstall“ options.
* New: Backup-file deletion on uninstall is disabled by default, and Media Library
images are never deleted by the plugin regardless of the selected uninstall settings.
* New: Added the `wp kitgenix-optimizer status` WP-CLI command for displaying the
current Image Optimizer status.
* New: Added `wp kitgenix-optimizer queue start`, `pause`, `resume`, `stop`, `retry`,
and `status` WP-CLI commands for managing the bulk optimisation queue.
* New: Added a manual „Recalculate stats from scratch“ action for administrators
who want to perform a complete optimisation statistics recount on demand.
* New: Redesigned the entire admin interface around the shared Kitgenix design
system with a sticky topbar, cross-plugin navigation, in-page settings search,
and consistent card-based layouts.
* New: Added „/“ and Cmd/Ctrl+K keyboard shortcuts for the in-page settings search.
* New: Added a light/dark theme toggle for the admin interface, with the selected
preference remembered between visits.
* Improved: All image writes are now atomic – output is written to a temporary
file, verified, and then renamed into place – preventing an interrupted PHP process
from leaving behind a corrupted or partially written image.
* Improved: Image optimisation now runs on `wp_generate_attachment_metadata` after
WordPress has generated registered image sub-sizes and applied `big_image_size_threshold`,
instead of processing the raw upload before WordPress core.
* Improved: The configured maximum image width and height are now integrated with
WordPress’s `big_image_size_threshold` filter so oversized images are resized
once instead of being independently resized by both WordPress and the plugin.
* Improved: Restoring an image backup now regenerates WordPress attachment metadata
and sub-sizes from the restored master image, keeping stored dimensions and generated
image files consistent with the restored source.
* Improved: Savings and optimised-image statistics are now stored in a lightweight
incrementally updated option instead of being calculated through a live database
scan on every Media Library or Settings page load.
* Improved: Compression presets are now labelled Conservative, Balanced, Aggressive,
and Maximum, with the applicable per-format quality values displayed directly
on each preset card, including AVIF values where supported.
* Improved: The Log tab now supports live search and pagination with 25 entries
per page.
* Improved: Added a reference table to the Log tab explaining what each recorded
category means and whether administrator action is required.
* Improved: The Support tab is now three focused cards – a PayPal donate card with
a collapsible monthly-amount picker, a „what your support funds“ summary, and
a „get involved“ panel for reviews and plugin links.
* Fix: Optimised output that is not actually smaller than the original image is
now discarded automatically and the original file is retained, preventing optimisation
from increasing file size.
* Fix: The „Strip Image Metadata“ setting is now correctly applied on Imagick-based
servers using `strip_meta()`. Previously the option had no effect when Imagick
was the active image editor, leaving EXIF and GPS metadata intact despite the
setting being enabled.
* Fix: The „PNG Compression“ setting is now correctly passed to the active image
editor. Previously the value was stored in Settings but never applied during
PNG optimisation.
* Security: AJAX handlers for single-image optimisation and restore now verify
the `edit_post` capability for the specific attachment in addition to the general`
upload_files` capability, preventing contributor-level users from optimising
or restoring attachments they do not have permission to edit.
* Security: Images are now validated before decoding using file-size limits, pixel-
dimension limits, and an estimated-memory check against PHP’s `memory_limit`,
allowing malformed or decompression-bomb-style files to be rejected before GD
or Imagick attempts to decode them.
* Removed: Removed the non-functional „Convert PNG to JPEG“ setting, which was
present in previous versions but had never been implemented.
* Dev: Added a shared `kitgenix-admin-components.js` component controller providing
reusable toast notifications, modals, collapsible cards, copy-to-clipboard controls,
and live table filtering for consistent behaviour across Kitgenix plugins.
## Meta
* Verze **2.0.0**
* Poslední aktualizace **před 7 hodin**
* Aktivních instalací **Méně než 10**
* Verze WordPressu ** 6.0 nebo novější **
* Testováno až do WordPressu **7.1**
* Verze PHP ** 8.1 nebo novější **
* Jazyk
* [English (US)](https://wordpress.org/plugins/kitgenix-image-optimizer/)
* Štítků
* [AVIF](https://cs.wordpress.org/plugins/tags/avif/)[image compression](https://cs.wordpress.org/plugins/tags/image-compression/)
[image optimization](https://cs.wordpress.org/plugins/tags/image-optimization/)
[media library](https://cs.wordpress.org/plugins/tags/media-library/)[webp](https://cs.wordpress.org/plugins/tags/webp/)
* [Podrobnosti](https://cs.wordpress.org/plugins/kitgenix-image-optimizer/advanced/)
## Hodnocení
Zatím nebyly zadány žádné recenze.
[Vaše hodnocení](https://wordpress.org/support/plugin/kitgenix-image-optimizer/reviews/#new-post)
[Zobrazit všechny recenze](https://wordpress.org/support/plugin/kitgenix-image-optimizer/reviews/)
## Spolupracovníci
* [ Kitgenix ](https://profiles.wordpress.org/kitgenix/)
## Podpora
Potřebujete pomoc?
[Fórum podpory](https://wordpress.org/support/plugin/kitgenix-image-optimizer/)
## Dary
Chtěli byste podpořit vývoj tohoto pluginu?
[ Přispět na tento plugin ](https://www.paypal.com/donate/?hosted_button_id=KALF36K6JJ9B2)