A free image compressor that never sees your images
Compresso is a free online image compressor that shrinks JPG, PNG and WebP files right in your browser. Most tools to compress images online upload your photos to a server first — Compresso doesn't. Compression runs on your own device using the Canvas API, so your images are never uploaded, stored or logged, and the tool keeps working even offline. No signup, no watermarks, no file limits.
How to compress an image online
Drop one or more images into the box above (or paste from your clipboard). Compresso compresses each one instantly at the default 80% quality — usually 60–90% smaller with no visible difference. Adjust the quality slider to trade size against fidelity, use the before/after comparison to check the result at full size, then download images individually or grab everything as a single ZIP.
Compress image to 100KB, 200KB or any exact size
Forms, job portals and government sites often demand an upload under a hard limit like 100 KB or 200 KB. Switch to Target size mode, type the number, and Compresso automatically finds the highest quality that fits under that limit for every image in the batch — no trial and error.
Compress JPG, PNG and WebP — or convert between them
JPG is best for photos, PNG for graphics with sharp edges or transparency, and WebP usually beats both at the same quality. In Auto mode Compresso keeps each image's format (preserving PNG transparency); pick JPG, WebP or PNG explicitly to convert while compressing. Converting photos to WebP typically gives the smallest files that still look sharp.
Batch image compression with ZIP download
Compress dozens of images in one go — product photos, blog assets, a whole event album. Every image shows its own savings ring, and the Download all button packs the entire batch into one ZIP, named and ready to use.
Why smaller images matter
Image weight is the biggest factor in web page size. Compressed images make pages load faster, improve Core Web Vitals and search rankings, use less bandwidth, and stop email attachments and form uploads from bouncing. Reducing a 4 MB photo to 400 KB is invisible to the eye but 10× faster to load.
Privacy bonus: EXIF data is stripped
Photos from your phone carry hidden EXIF metadata — GPS location, device model, timestamps. Because Compresso re-encodes every image from pixels, compressed copies come out clean. Share them without sharing where they were taken.
FAQ
Is this image compressor really private?
Yes. Open your browser's network tab while compressing — zero upload requests. Everything happens in your browser's memory, and the page works offline once loaded.
Will I lose image quality?
Lossy compression removes detail your eye can't see. At 80% quality the difference is virtually invisible for photos; use the comparison slider to judge for yourself before downloading.
Is there a file size or count limit?
No hard limits — batch as many images as your device's memory can handle. Very large images (50+ megapixels) may take a few seconds each.
Does it work on phones?
Yes — Compresso is mobile-friendly and installable as an app. Compress photos right on your phone before uploading or sharing them.
