Where 50 KB limits come from
A 50 KB limit is common on exam and recruitment portals, especially for photo and signature uploads, and on older government and university forms. The portal only needs a recognisable face or a legible signature, and small files kept early systems fast. Many Indian exam portals, for example, ask for photos between 20 and 50 KB and signatures between 10 and 20 KB, and sometimes exact pixel dimensions as well; always follow the specific notice.
Getting a photo under 50 KB
At 50 KB, dimensions matter more than quality. A typical phone photo at full size cannot reach 50 KB at any quality that still looks like a photo; a 400 × 500 px crop of the face can, at quality 70 or better. The tool shrinks the image automatically when it needs to, but you will get a better result by cropping to head and shoulders first, so the pixels go where they matter. Use a plain background; busy backgrounds eat bytes.
If the form also specifies pixels
Set the maximum width and height to the form's figures, so the search stays inside them. If the form demands an exact size (for example 200 × 230 px), crop to that ratio with resize and crop first, then compress here.
Signatures
A signature on white paper compresses very well. Scan or photograph it, crop tightly around the ink, convert to greyscale if the form allows, and it will usually land well under 50 KB at good quality. If the portal wants a transparent signature, the signature tool produces a clean PNG.
Check before you submit
Open the result at 100%: the face should be clear and free of blocky patches, and a signature's strokes should be smooth. If you see artefacts, crop tighter rather than lowering quality further.
Step by step
- Add the photo or scan, ideally the original from your camera or scanner rather than a copy sent through a messaging app.
- If the form gives pixel dimensions, type them as the maximum width and height above the button.
- Leave the format on JPG unless the form accepts WebP; JPG is what exam and recruitment portals almost always want.
- Click Compress to 50 KB. The result shows the final size, dimensions and quality.
- Open the downloaded file and check it at 100% before uploading: faces clear, text legible.
What to expect at 50 KB
As a rough guide, 50 KB is enough for a head-and-shoulders photo or a signature at about 400 × 500 px. The exact numbers depend on the content: plain backgrounds and soft light compress far better than busy, high-contrast scenes. Because the tool measures every attempt, you get the highest quality that genuinely fits rather than a guess that might be over the limit or needlessly blurry.
Troubleshooting
- The form says the file is still too big. Some forms count 1 KB as 1,000 bytes, not 1,024. Lower the target by about 3% and run it again.
- The form says the image is too small. It has a minimum pixel size or minimum file size as well. Set the maximum width and height to its stated dimensions, and use a higher quality.
- The photo looks blocky. Crop away background so the same bytes are spent on the subject, or start from a sharper original.
- The upload is refused as the wrong type. Check the file ends in .jpg; some forms reject .jpeg or WebP. Rename it if needed; the content is the same.
Private by design
The image never leaves your device. It is decoded in your browser, processed in a background worker by open-source codecs compiled to WebAssembly (MozJPEG, libwebp, libavif and OxiPNG, via the jsquash project, plus pica for resizing) and handed back as a download. There is no upload, no account and no server copy to delete. You can confirm it in your browser's developer tools: the Network tab shows the page's own files and the codec files loading, and nothing carrying your image. After the first visit the tools work offline.