Image Compressor
Compress JPEG, PNG and WebP images instantly, right in your browser. Everything runs on your device with canvas encoding: your files are never uploaded to any server.
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JPEG, PNG, WebP · up to 20 files · 40 MB each
100% private: compression runs in your browser, files never leave your device.
How this image compressor works
Every image you add is decoded and re-encoded entirely inside your browser using the canvas engine that ships with Chrome, Firefox, Safari and Edge. The file is read from disk into memory, drawn onto an offscreen canvas, optionally resized, then re-encoded as WebP, JPEG or PNG at the quality you choose. Nothing is uploaded: there is no server on the other end, no queue and no file limit billing, which is why the tool works offline once loaded and handles a 40 MB photo as fast as your machine can decode it.
Two settings do the heavy lifting. Quality controls how aggressively the encoder discards detail your eye cannot resolve, and resizing the longest side removes pixels that a 1200 pixel wide blog column never displays anyway. Combining both, an 8 MB camera JPEG typically lands between 150 and 400 KB with no visible difference at normal viewing size.
Smaller images are the fastest page speed win
Images are the heaviest resource type on the median web page, and Largest Contentful Paint, the Core Web Vitals metric Google uses in ranking, is an image on most sites. Cutting a hero image from 1.8 MB to 200 KB routinely improves LCP by a full second on mobile connections, which is more than most code-level optimizations can claim. If you run WordPress, aim for a total page weight under 1.5 MB with no single image over 200 KB, and serve WebP wherever possible: it decodes fast and averages 25 to 35 percent smaller than an equivalent quality JPEG.
Compress before you upload, not after. Optimization plugins that shrink images on the server still keep the original and burn hosting disk space. Compressing locally with a tool like this one keeps your media library lean from day one.
Choosing format and quality in 2026
WebP is the safe default in 2026: it is supported by every current browser, keeps transparency, and beats JPEG at every quality level for photographs. Keep JPEG only when a legacy system rejects WebP, and keep PNG only for images that must stay pixel perfect, such as screenshots with fine text or logos you will edit again. For quality, 75 to 85 is the sweet spot for photos; below 70, artifacts appear around edges and gradients, and above 90 the file grows quickly for detail nobody sees. Use the before and after slider on each card to judge with your own eyes instead of trusting a number: if you cannot find the divider at your chosen quality, the smaller file wins.
Image compression FAQ
How does client-side image compression work?
Your browser decodes the image into raw pixels, draws them onto a canvas, then re-encodes them with its built-in WebP, JPEG or PNG encoder at the quality you pick. All of this happens in your device memory using standard web APIs, so results appear in milliseconds and the tool keeps working even on a poor connection.
Are my images uploaded anywhere?
No. This tool has no upload endpoint at all: files are read locally with the File API, processed on a canvas, and downloaded straight from your browser memory. Nothing is sent over the network, nothing is stored, and closing the tab destroys every trace. You can verify this in the network panel of your browser developer tools.
What is the difference between lossy and lossless compression?
Lossy compression, used by JPEG and standard WebP, permanently discards detail your eye is unlikely to notice, which is how it reaches 70 to 95 percent savings. Lossless compression, used by PNG, rearranges data without discarding any, so every pixel survives but savings are much smaller. Choose lossy for photos; keep lossless PNG for screenshots, diagrams and logos with sharp edges.
What quality setting should I use?
Start at 80, the default here. For most photos, 75 to 85 is visually identical to the original at a fraction of the size. Drop to 65 or 70 for backgrounds and thumbnails where fine detail does not matter, and only go above 90 for archival images. Check the compare slider before committing: your eyes beat any rule of thumb.
Is WebP better than JPEG for photos?
For the web, yes. At the same visual quality, WebP files are typically 25 to 35 percent smaller than JPEG, and WebP also supports transparency, which JPEG cannot do at all. Every current browser has supported WebP for years, so the old compatibility argument is gone. Keep JPEG only for email attachments or software that still refuses WebP.
Does compressing images hurt SEO?
The opposite. Oversized images slow Largest Contentful Paint, a Core Web Vitals metric that feeds directly into Google ranking systems, and they waste crawl budget on media Google has to fetch. Compressed images load faster, improve mobile experience and reduce bounce rate. As long as the image still looks sharp at its displayed size, smaller is strictly better for search.
How large should images be on a WordPress page?
Aim for under 200 KB per image and under 1.5 MB total page weight. A full-width hero rarely needs more than 1920 pixels across, blog content images around 1200, and thumbnails 400 or less. Resize to the largest size actually displayed, encode as WebP at quality 80, and your WordPress pages will comfortably pass Core Web Vitals on mobile.
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