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② 後台搜尋「DZIEWA Media Converter — AVIF + WebP」→ 直接安裝（推薦）
原文外掛簡介
DZIEWA Media Converter creates sidecar .avif and .webp files next to your originals (no replacement of JPG/PNG in the Media Library). On the front end it can rewrite tags to
How it works
The plugin generates additional AVIF and/or WebP files beside every JPEG/PNG you upload. Originals are never touched or replaced — they remain in the Media Library and on disk as a safe fallback. The optional content filter detects tags in your post content and wraps them in
Conversion
AVIF + WebP, AVIF-only or WebP-only output modes. AVIF requires PHP GD built with AVIF support; the plugin auto-detects this on activation and gracefully falls back to WebP-only when AVIF is unavailable.
Configurable quality per format (independent AVIF and WebP quality sliders in settings).
Automatic conversion on upload — new attachments are converted in the background via WP-Cron or Action Scheduler (when available), so the upload screen never blocks.
Intermediate sizes (thumbnails) are optionally converted too, so every srcset variant has its own AVIF/WebP sidecar.
Existing media
Background queue processes already-uploaded images in configurable batches (default 20 files per run, range 5–200). You can scope the queue to a single uploads subfolder and/or a date range to avoid scanning the whole library at once.
Bulk action in the Media Library — select images and run Convert to AVIF/WebP from the bulk menu.
Per-attachment button — Media Library list, attachment edit screen and media modal each show a Convert to AVIF/WebP button next to live savings stats (before/after size, percentage saved per format).
Front end (content rewriting)
Optional
Lookup of attachment IDs from URLs is cached in the WordPress object cache (Redis/Memcached when available) and memoised per request, so heavy pages with many images stay fast.
Tools & admin UI
Cleanup tool — remove old generated .avif / .webp sidecars by age (30/60/90/120 days) and folder scope, with a per-folder picker.
Admin bar download — optional link on singular posts/pages to download the original JPG/PNG of the featured image (useful for social platforms that don’t accept AVIF/WebP).
Event log — last 100 events (errors, conversions, queue runs) visible on the settings page.
Three-option uninstall dialog — when removing the plugin you choose between Cancel, Remove (keep generated files) or Remove and delete files.
Privacy & dependencies
No external services, no remote calls, no tracking. Everything runs on your own server.
Requires PHP 8.3+ and PHP GD with WebP support (imagewebp). AVIF is optional.
Fully translated to Polish; English source strings ready for further translations via GlotPress.
