Compress images, keep the quality.
Shrink PNG, JPEG and WebP with a live before/after slider, resize and format conversion, and batch downloads — all running privately in your browser. Nothing is ever uploaded.
Drop images here
or click to browse · JPEG, PNG, WebP, GIF · multiple files
Everything runs locally — your images never leave this browser.
Why PixelPress
Sharp at smaller sizes
A live before/after slider lets you dial in quality until the file is tiny but the picture still looks perfect — no guessing.
Private by default
Compression runs on your device with the Canvas API. No uploads, no accounts, no tracking — your photos never leave the page.
Batch processing
Drop in dozens of images at once. Every file is compressed with the same settings, with per-image savings and a one-click download-all.
Resize & convert
Cap the maximum width or height and convert between JPEG, PNG and WebP — perfect for web pages, email and social media.
Image compression, made simple
PixelPress is a free online image compressor that shrinks the file size of your photos and graphics without a noticeable drop in quality. Load a JPEG, PNG, WebP or GIF, drag the quality slider, and watch the before/after preview update in real time so you can see exactly what you are trading away. Most web photos can lose 50–80% of their weight at a quality level of 75–85% while still looking crisp — and PixelPress shows the precise saving for every file, so you never have to guess.
Everything happens client-side in your browser using the HTML5 Canvas API, which means it is fast, works offline once loaded, and is completely private — your images are never uploaded to a server. Beyond compression you can resize images to a maximum width or height and convert between formats: turn a heavy PNG screenshot into a lean JPEG, or switch to modern WebP for the smallest files on the web. Batch mode processes a whole folder of images at once and lets you download them all together, making PixelPress a quick fix for page-speed, Core Web Vitals, email attachments and social uploads.
Guides & articles
Plain-language explainers on image formats, compression and getting sharp, lightweight images.
PNG vs JPEG vs WebP: Which Format to Use
Each format is good at a different job. Learn what PNG, JPEG and WebP are built for, and a simple rule for picking the right one every time.
How Image Compression Works: Lossy vs Lossless
What actually happens when a file shrinks? A plain-language look at redundancy, the human eye, and why some compression is reversible and some is not.
How to Compress Images Without Losing Quality
You can cut most of an image's file size while keeping it visually perfect. Here is the practical workflow and the settings that matter.
Frequently asked questions
What compression ratio does PixelPress achieve?+
It depends on the image type, its content and the chosen quality level. On average, JPEG compresses by 50–80%, PNG by 20–60% and WebP by 25–70% compared to the original at an 80% quality setting. The real saving is shown for every file the moment it is processed, so you always see the exact before and after size.
Does PixelPress support the WebP format?+
Yes. PixelPress fully supports WebP as both input and output. You can load WebP files to compress them further, or convert to WebP from JPEG, PNG and GIF. WebP is Google's modern format and typically produces 25–35% smaller files than JPEG at comparable visual quality, and it is supported by all current browsers.
Are my photos sent to a server?+
No, absolutely not. PixelPress works entirely in the browser using the HTML5 Canvas API and File API. None of your files leave your device or are transmitted to any server — neither to us nor to third parties — so you can safely process personal photos and confidential material.
What's the difference between lossy and lossless compression?+
Lossless compression preserves every pixel exactly and removes only redundant data — PNG uses this (the Deflate algorithm), giving perfect quality but a smaller size reduction. Lossy compression, used by JPEG and WebP, discards visually imperceptible detail; at a sensible quality level of 75–85% the losses are indistinguishable and the file can become 4–10 times smaller.
Can I convert PNG to JPEG?+
Yes. Load a PNG, choose JPEG in the Output Format setting, pick a quality level and download. One caveat: JPEG has no transparency, so any transparent areas in the PNG are flattened onto a white background. If you need to keep transparency and still compress well, convert to WebP instead.
How do I choose the optimal quality level?+
Use the before/after slider. Start at 80% and lower it until you notice compression artifacts — blurry edges or blockiness in smooth gradients; that threshold is your optimum. As a guide: web photos 75–85%, social media 80–90%, thumbnails 60–75%, archival 90–95%. For PNG the quality value only affects algorithmic compression, not visual quality.
Can I process several files at once?+
Yes. Drag in or select multiple images, adjust the compression settings, and every file is processed with the same quality, format and size. Each file shows its own before → after size and percentage saved, and you can download them individually or all at once. The list also shows the total saving across every file.