What fits in 50 KB
Fifty kilobytes is enough for one clear page: a caste or income certificate, a domicile certificate, an Aadhaar or PAN copy, a disability certificate or a single page of a mark sheet. It is not enough for a long document at a readable quality. If a form gives 50 KB for a file that has several pages, check whether it really wants every page or only the first one.
For a single typed page, the gentle first step often reaches 50 KB with nothing lost. For a scan, the page has to be redrawn, and that is where a little preparation pays off.
Getting a scanned certificate under 50 KB
- Scan flat and straight. A phone scanner app that crops to the paper edge gives a cleaner page than a photo that shows the table around it.
- Tick black and white. Most certificates are printed in black ink on white paper. Without colour, the same 50 KB buys sharper text.
- Avoid shadows and folds. A dark shadow across a page costs bytes and can hide a seal or a signature.
After compressing, the result shows page 1 as it now looks. Open the downloaded PDF and zoom in on the name, the date of birth, the certificate number and any stamp. If any of these are blurred, the page has too much in it for 50 KB: crop it tighter or upload only the part the form needs.
Several documents, one 50 KB limit
Some forms take one PDF per document, each with its own limit; others want everything merged into one file. When each document has its own upload button, compress each one here separately. When one file must hold several pages, a larger limit such as 100 KB may be offered for that slot, so read the line next to each button.
Photo or signature instead of a PDF?
If the slot asks for a JPG, this is the wrong tool: use compress image to 50 KB or compress image to 20 KB for a signature. For any other PDF limit, compress PDF takes your own number.
Built on two open-source projects that run in your browser: qpdf, compiled to WebAssembly, for the lossless rewrite, and Mozilla's PDF.js to redraw pages when that is not enough.