How to compress image to 50KB
Exam and ID forms often cap photos and signatures at 50 KB. This tool finds the highest-quality JPG that fits under 50 KB and shows the exact size before you download.
- Drop, paste or choose your image (JPG, PNG, WebP, GIF, BMP or AVIF). A sample photo is loaded so you can try it first.
- The target is preset to 50 KB. Change it, or pick another preset, if your form asks for something different.
- Optionally choose an output format and a maximum width or height.
- Check the side-by-side preview and the exact byte count, then click Download.
How the compressor hits an exact size
The tool decodes your image in the browser, then re-encodes it with the browser's own JPEG, WebP or PNG encoder. For JPEG and WebP it runs a binary search on the quality setting — usually 6 to 10 test encodes — and keeps the highest quality whose file is at or under your target. If even a low quality (40%) is still too large, it reduces the pixel dimensions by the amount the byte count suggests, then searches quality again, so you get the largest picture that fits rather than a blocky one. PNG is lossless, so for PNG only the dimensions change. If your file is already under the target and you keep the same format, the original is returned untouched.
Everything happens on your device with the Canvas API; nothing is uploaded, and the re-encoded file does not carry the original EXIF metadata (camera, GPS).
Frequently asked questions
How do I get a photo under 50 KB without it looking blurry?
Let the tool keep quality as high as possible and resize only as much as needed. If the form gives required dimensions (for example 200×230 px), enter them under Dimensions first — a smaller image needs far less compression, so it looks sharper.
How do I compress a signature to 50 KB?
Scan or photograph the signature on white paper, crop it tightly, and drop it here. Signatures compress very well; most fit under 50 KB, and often under 20 KB, at full resolution.
Why is my result smaller than 50 KB?
The tool searches quality in small steps and never goes over the limit, so the result is usually within a few percent under 50 KB. If the original already fits, it is returned unchanged.
Are my images uploaded to a server?
No. Compression runs entirely in your browser using the Canvas API. The image never leaves your device, which also makes it safe for ID photos and signatures.
Is it free?
Yes. Compressing one image at a time is free with no signup and no watermark. Gridloom Pro adds batch compression of many images with a single ZIP download.