# Convert Your Images to WebP for Free > Free WordPress WebP converter. Bulk-convert JPEG, PNG and GIF to WebP, auto-convert on upload, serve next-gen images and boost Core Web Vitals. - Canonical URL: - Markdown URL: Category: Speed feature WebP files are roughly 25-35% smaller than JPEG with the same visual quality. Convert your JPEG, PNG and GIF images in place - unlimited, on your own server, with links that never break. ## Old Image Formats Are Costing You Speed If your media library is still all JPEG and PNG, you're shipping more bytes than you need to. ### The "Next-Gen Formats" Warning PageSpeed Insights flags JPEG and PNG images and tells you to serve them in next-gen formats. Until you do, that audit keeps failing and your score stays capped. Impact: WebP is ~25-35% smaller than JPEG ### Heavier Pages, Slower Loads Every extra kilobyte an old format carries is a kilobyte your visitor waits for. Across a full page of images that adds up to a slower LCP and a worse first impression. Impact: Slower LCP hurts Core Web Vitals ### Manual Conversion Breaks Links Converting images by hand and re-uploading spawns new URLs, leaving old posts and product pages pointing at files that no longer exist. Impact: Broken images across posts and products ## How WebP Conversion Works One safe pass turns your existing formats into lean, next-gen WebP. ### Steps 1. **Select** — Choose which source formats to convert - JPEG, PNG, GIF - so you stay in control of what gets touched. 2. **Convert** — ThumbPress writes a smaller WebP version first, pre-flighting available memory so large images never crash the process. 3. **Rewrite** — It rewrites stored URLs across post content, meta and options - including WooCommerce - then deletes the old file only after the new one is safely in place. ### 3 Ways to Convert Convert everything at once, fix a single image, or automate it from here on. #### Bulk conversion Convert your whole library in one go. It runs in the foreground or in the background via Action Scheduler with live progress and a cancel button, so even large sites never time out. #### Single image A one-click WebP button right in the media library - ideal for converting a hero image or testing the result before a full run. #### Auto-convert on upload Enable it once and every new image is converted to WebP automatically as it's uploaded, so your library stays next-gen without a thought. ## Compress with Confidence Smaller files, unbroken links, and nothing ever leaves your server. - WebP files are ~25-35% smaller than JPEG - Free and unlimited, no per-image fees - Auto-rewrites URLs so links never break - Memory-safe and collision-safe conversion - Old file removed only after the new one is written - Runs on your own server, nothing sent out ## Frequently Asked Questions ### How do I convert my images to WebP? Pick your source formats and run a bulk conversion, convert a single image from the media library, or switch on auto-convert so every new upload becomes WebP automatically. ### Is WebP better than JPEG for SEO? Indirectly, yes. WebP files are around 25-35% smaller than JPEG, so pages load faster and score better on Core Web Vitals - and it clears PageSpeed's "serve images in next-gen formats" audit. ### Will converting break my links? No. After each conversion ThumbPress rewrites the stored URLs across your post content, meta and options - including WooCommerce - so every reference points at the new file. ### Does WebP work in all browsers? WebP is supported by all modern browsers, including current versions of Chrome, Firefox, Edge and Safari. ### Is it really free? Yes. WebP conversion in ThumbPress is completely free and unlimited, with no image caps and no cloud credits - it all runs on your own server. ### Will a bulk conversion time out on a large library? No. Background conversion processes your library in batches through an Action Scheduler queue that keeps running after you close the tab, so libraries with tens of thousands of images finish without hitting a PHP execution limit. ### Can I stop a conversion halfway through? Yes. Cancel at any point and the queue stops cleanly. Images already converted stay converted, and you can start a fresh run later to finish the rest. ### What happens to my original JPEG and PNG files? The WebP version is written first and verified, and only then is the old file removed. If a conversion fails for any reason, the original is left exactly where it was. ### Are my thumbnail sizes converted too? Yes. Conversion works on the attachment as a whole - the full-size file is converted and the registered sizes are rebuilt from it, so you never end up with a WebP original and JPEG thumbnails. ### Will converting a huge image run my server out of memory? ThumbPress raises the image memory limit and pre-flights each file against the memory actually available before it starts. Images that would not fit are skipped rather than crashing the run. ## Ready to Go Next-Gen? Install ThumbPress free and convert your library to WebP - no image caps, no credits. ## About ThumbPress ThumbPress is a WordPress plugin for image optimization and thumbnail management, built by Codexpert. It runs on your own server: compression, WebP/AVIF conversion and cleanup all happen locally, with no third-party image API and no per-image credits. - All features: - Pricing: - Documentation: - Blog: - Support: - WordPress.org listing: