Convert JPG to WebP, PNG to WebP, and GIF — or compress to an exact KB target. Instant, free, and no upload required.
Drop your images
Drag and drop JPG, PNG, GIF, or BMP files — or click to browse. No account needed, works in any modern browser.
Convert or compress to size
Use "Convert to WebP" for quality control, or switch to "Compress to Size" to compress your image to a specific size — set an exact KB target like 100KB for web upload limits.
Download as WebP
Each file downloads individually, or grab everything at once with the "Download All as ZIP" button when multiple files are ready.
WebP was created by Google in 2010, derived from the VP8 video codec technology originally developed for streaming video. Unlike JPEG — a format designed in 1992 for the hardware constraints of that era — WebP uses modern prediction encoding: instead of storing every pixel value independently, it analyzes blocks of pixels and records only the difference from what a mathematical model predicts, then compresses those residuals far more efficiently. The result is smaller files at the same visual quality, or better visual quality at the same file size.
The browser's Canvas API is what makes fully client-side conversion possible. When you drop an image onto this tool, JavaScript reads it into memory as a Blob, draws it onto a hidden <canvas> element, then calls canvas.toBlob('image/webp', quality) — a native browser method that invokes the WebP encoder built into Chrome, Firefox, or Safari. The encoded bytes come back to JavaScript as a downloadable file. No data crosses a network connection at any point.
WebP outperforms JPEG through two techniques: block prediction (using surrounding pixel values to anticipate block content rather than storing raw data) and arithmetic entropy coding(a more efficient scheme than JPEG's Huffman coding). For PNG files, WebP's lossless mode similarly beats PNG's DEFLATE algorithm by around 26% on average, while preserving exact pixel values and full alpha-channel transparency.
File size directly affects web performance in three measurable ways. Smaller images reduce initial page load time, which improves Google's Core Web Vitals — particularly the Largest Contentful Paint (LCP) score used in search ranking. They also lower bandwidth costs for site owners and their visitors, an effect that's especially pronounced for users on mobile data connections where every kilobyte counts.
Sarah is a food blogger who shoots her recipes with a mirrorless camera. Her typical JPEG exports from Lightroom run 4–6MB each, and a single recipe post averages six photos — meaning a reader on a standard 4G connection has to download 24–36MB before the page feels complete. Her average page load time was hovering around 8–10 seconds.
After converting those images to WebP at 80% quality, the same photos compressed to 400–600KB each. A 5MB JPEG became a 480KB WebP — a roughly 90% reduction with no perceptible difference on screen. Her recipe pages now load in under 2 seconds, and her Google Search Console LCP scores improved from "Poor" to "Good" within a few weeks of the switch.
Quality settings by use case:
Original image format. A JPEG that has already been compressed once will show more quality loss when re-compressed to WebP than a source file from a RAW export, a TIFF, or a lossless PNG. Whenever possible, start from the highest-quality version of the file rather than a previously compressed copy.
Quality setting. The quality slider runs from 1 to 100. Values of 80–85 are the practical sweet spot for most web images — enough compression to substantially cut file sizes while preserving the detail the eye can see at screen resolution. Below 70, blocking and ringing artifacts become noticeable in photographic content. Above 90, file sizes grow quickly with rapidly diminishing visual returns.
Image content type. Photographs — with their continuous tonal gradients, natural noise, and complex textures — compress far better than flat graphics or line art. A photo might achieve 80–90% size reduction; a logo or diagram with large areas of flat color might achieve 40–60%.
Resolution and dimensions.Compression ratio is largely independent of pixel dimensions, but a 4000×3000px image will always produce a larger output file than an 1200×900px version at the same quality setting. If you don't need full resolution for web display, resize before converting to maximize savings.
Transparency (alpha channel). PNG files with transparency convert to WebP while preserving the alpha channel — unlike JPEG, which drops transparency entirely. If you need transparent images for web use (icons, overlays, cut-out product photos), WebP handles this natively in all modern browsers.
WebP is the right choice for almost every image on a public website: blog post photos, e-commerce product images, hero banners, thumbnails, open-graph social sharing images, and background graphics. It's particularly valuable for pages with many images, mobile-first sites where bandwidth is constrained, and any project where Core Web Vitals scores affect search visibility.
There are a few situations where WebP isn't the right tool. Print materials require lossless, high-color-depth formats such as TIFF or PSD — lossy WebP is not appropriate for files headed to a print production workflow. If you're distributing images through platforms that don't support WebP (certain email clients, some legacy CMS systems, or older enterprise intranet tools), stick with JPEG or PNG for those specific outputs. And if a PNG uses complex layered transparency that will be composited further in a professional design application, keep working in PNG until the final web-export step.
For everything else — anything going on a website that real users will load on real devices — WebP will give you smaller files, faster load times, and better search performance than JPEG or PNG.
WebP is a modern image format developed by Google that delivers superior compression for web images. When you compress to WebP, files are typically 25–35% smaller than equivalent JPEG or PNG at the same visual quality — which means faster page loads, lower bandwidth costs, and better Core Web Vitals scores. All modern browsers support WebP, making it the best default format for images on the web.
Using this free JPG to WebP converter is simple: drag and drop your JPG files onto the upload zone above, make sure "Convert to WebP" mode is selected, and adjust the quality slider if needed (85 is a good default). The conversion runs instantly in your browser — no upload, no server, no waiting. PNG to WebP works the same way.
Switch to "Compress to Size" mode, upload your image, and type your target in the KB field (e.g. 100 to compress image to 100KB). This WebP image compressor uses binary search over quality levels to automatically find the highest quality that still fits under your target — a technique that beats manual guessing every time. Great for compressing images for web upload limits, email attachments, or CMS restrictions.
No. This tool is a fully client-side WebP converter — all processing happens in your browser using the native Canvas API. Your images never leave your device and are never sent to any server. You can disconnect from the internet after the page loads and the tool will still work perfectly.
WebP uses lossy compression by default, so some quality reduction is expected. However, at quality 80–90 the difference is barely perceptible to the human eye. Because the WebP codec is more efficient than JPEG, you often get better perceived quality at a smaller file size — making it the ideal format when compressing images for web use.
Yes. WebP is supported in Chrome, Firefox, Safari (since v14), Edge, Opera, and all modern mobile browsers. As of 2024, WebP support covers over 97% of global browser usage, so you can safely compress to WebP for any public website without worrying about compatibility.
Yes! This bulk WebP converter lets you drag and drop up to 50 files at once. All images are processed simultaneously in your browser. When 2 or more files are done, a "Download All as ZIP" button appears so you can grab everything in one click — perfect for batch converting a whole folder of JPGs or PNGs to WebP.
This free WebP converter and image compressor accepts JPG, JPEG, PNG, GIF, WebP, and BMP files as input. All are converted to WebP output. The tool relies on your browser's built-in image decoding, so any format your browser can display can be converted — no plugins or extensions required.
Results depend on image content and your quality setting, but typical savings when you compress images for web are: JPG photos 20–35% smaller, PNG graphics 30–60% smaller. The before/after file size and percentage reduction are shown on each file card after conversion. Use the "Compress to Size" mode if you need to hit a specific KB target like 100KB or 200KB.
Yes, completely free with no limits. There's no signup, no account required, no watermarks on output files, and no cap on individual file size. The 50-file batch soft limit applies per session. This free WebP converter is supported by advertising so it can stay free for everyone.
Yes. compresstowebp.com offers several advantages over Squoosh — bulk processing of multiple images simultaneously, a target file size mode that automatically finds the right quality level, and WebP compression that often produces better quality output at equivalent file sizes. If you need to compress a single image with advanced codec options, Squoosh is excellent. If you need to compress multiple images quickly or hit a specific file size target, compresstowebp.com is the faster choice.
Yes. compresstowebp.com offers the same client-side WebP compression as compress-or-die with no uploads, no server processing, and no file size limits. All compression happens directly in your browser. It's completely free with no account required.