WP Manifestindependent plugin directory
manifest / performance / auto-webp

Auto WebP

Lightweight image-to-WebP converter. Auto-converts on upload, serves WebP to supporting browsers, bulk-converts existing images. Works on any hosting.

by Denys Dyuzhaev · github.com/denmlt/auto-webp · website

★ 0stars

Install

Download source zip No release zip yet

This is the repository archive. It installs, but the folder name will carry the branch suffix and updates will not flow.

Install straight from GitHub with WP-CLI:

wp plugin install https://github.com/denmlt/auto-webp/archive/refs/heads/main.zip
No built-in updater. New versions won't appear under Dashboard → Updates. Install new releases yourself, or let Git Updater track the repository.
Readme github.com/denmlt/auto-webp ↗

Lightweight WordPress plugin that converts images to WebP format. Auto-converts on upload, serves WebP to supporting browsers, and bulk-converts existing images.

Works on any hosting — no .htaccess rules or server configuration required.

Features

  • Auto-convert on upload — creates WebP copies for all image sizes when you upload JPEG, PNG, or GIF
  • Smart delivery — replaces image URLs with WebP versions for browsers that support it (pure PHP, no server config needed)
  • Bulk conversion — convert all existing images with a progress bar, processed in batches to avoid timeouts
  • Media Library column — see WebP status and savings percentage for each image
  • Single-click convert — convert individual images directly from the Media Library
  • Cleanup — automatically removes WebP files when original media is deleted
  • Quality control — adjustable WebP quality (default: 82%)
  • Dual engine — uses GD library (available on 95%+ of hosts) with Imagick fallback

Requirements

  • WordPress 5.0+
  • PHP 7.4+
  • GD library with WebP support or Imagick with WebP support

Installation

  1. Download or clone this repository into wp-content/plugins/auto-webp/
  2. Activate the plugin in WordPress admin (Plugins page)
  3. Configure at Settings > Auto WebP
cd wp-content/plugins/
git clone https://github.com/denmlt/auto-webp.git

Settings

Option Default Description
WebP Quality 82% Compression quality (1-100). Lower = smaller files
Auto-convert on Upload On Create WebP copies automatically
Serve WebP On Replace URLs for supporting browsers
Cleanup On Delete WebP files when media is deleted

How It Works

The plugin creates .webp copies alongside your original images (e.g., photo.jpg -> photo.webp). When a visitor's browser supports WebP (all modern browsers do), the plugin swaps image URLs through WordPress filters — no redirect, no rewrite rules.

This approach works on:

  • Apache
  • Nginx
  • LiteSpeed
  • Any PHP-capable hosting

Screenshots

Settings page shows conversion engine, stats, bulk converter, and configuration options. The Media Library gets a "WebP" column showing conversion status and space savings.

License

GPL-2.0+ — see LICENSE for details.

Author

Denys Dyuzhaev