A WordPress plugin that creates WebP copies of your images while keeping the originals. Convert on the server or use the optional browser mode when your host cannot write WebP, with progress reporting and checks before converted files are saved.
DownloadVersion 1.0.1
Safe WebP Queue converts WordPress images to WebP while keeping the original JPEG and PNG files. It handles generated image sizes too, reports what happened, and can skip conversions that would make a file larger.
Hosting support is where this gets awkward. WordPress might handle your existing images perfectly well while its image editor cannot write WebP.
Version 1.0.0 adds another route: conversion in the administrator’s browser, using a WebAssembly encoder bundled with the plugin. There is no separate conversion service or desktop application to install. Your browser processes the image and sends the finished WebP back to WordPress.
The resulting file goes through the same checks and file management as a server conversion. Before accepting it, the plugin checks that the source and conversion settings are still current. It also coordinates browser saves with server conversion and cleanup, so those operations do not interfere with each other.
The browser panel shows progress, individual results and a stop control. It checks whether the browser and site configuration support conversion and explains what is missing when they do not.
Browser conversion is off by default and needs the admin page to stay open while it runs. The persistent server queue and automatic conversion of new uploads still require a compatible server encoder.
I’ve tested the browser route in Chrome and Safari, including transparent PNGs, generated sizes, saved results and conversions that turn out larger than the original.
Published
Safe WebP Queue 1.0.0 adds browser conversion for hosts that cannot write WebP. Making it fit the existing plugin also meant fixing quality settings, rejecting stale results and coordinating browser work with the server queue.
Tested up to header to 7.1; compatibility testing still uses WordPress 7.1.1.codec/ directory.1.0.0 - 2026-09-19
Added browser (WebAssembly) conversion. A WebP encoder compiled to WebAssembly ships with the plugin and runs in the administrator's browser, so images on hosts whose image editor cannot write WebP are still convertible. Nothing is installed on the machine and no service is contacted; only the finished WebP file returns to the site.
Added a browser conversion panel to the plugin page: capability detection that names the missing browser feature, HTTPS and Content Security Policy checks, a per-file progress bar, a running result log, a stop control, and a report refresh when the run ends.
Added the "Convert images in the browser" setting, off by default, plus a browser conversion row in the server checks and a report reason and editor label for files that only the browser can convert.
Routed browser output through the same staging, ownership, conflict, totals and generated-map code as the local image editor backends, so a browser conversion is indistinguishable from a server conversion afterwards, including frontend serving.
Kept the persistent queue honest on hosts without a WebP writer: conversion jobs, whole-library jobs and automatic new-upload conversion are refused with a clear message instead of failing attachment by attachment, and browser-only files are reported as skipped rather than failed.
Blocked a browser run while a server conversion job holds the queue, and suspended the page's queue worker while a browser run is in progress, so the two backends never write the same attachment at the same time.
Added tests/browser-wordpress.php: integration coverage for capability routing, the REST prepare/finish handshake, container validation, replay, changed sources, foreign sibling files, cross-user tokens, WebP validation, stored metadata, totals and cleanup.
Added a CI job that type checks the WebAssembly module, rebuilds the committed bundle, compares it with the shipped files and confirms the bundled codec licences.
Fixed server conversion ignoring the selected quality when WordPress changes the output format to WebP.
Fixed stale browser results after quality changes, damaged outputs, or a replaced attachment source; browser saves recheck the current source and settings.
Serialized cleanup, totals recalculation, and browser saves with the server queue, kept conflicting controls disabled during a browser run, and allowed conversion after a server job is paused.
Added a real worker/codec capability probe, useful server error messages, bounded uploads, and EXIF rotation/mirror rejection before decoding.
Corrected encoder labels and savings for partially converted attachments, and applied memory limits to regeneration too.
Stopped automatic uploads from retrying browser-only images.
Verified WordPress 7.1.1 with GD, Imagick, WP-CLI, and the browser backend regressions; updated the CI matrix.
Added measured size and speed comparisons for large/small JPEG and PNG files using Chrome, GD, and Imagick at quality 80.
Rewrote the description for shared-hosting users and refreshed six screenshots, including a live WebAssembly conversion.
Tested browser WebAssembly conversion in Google Chrome 153.0.8010.52 on WordPress 7.1.1 and real Safari 26.6.2 on WordPress 7.1 (macOS), covering JPEGs, transparent PNGs, generated sizes, saved results, and larger-output skips.
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