Compress marksheets and counselling documents to about 300KB for JoSAA, NEET and similar processes. Nothing leaves your browser.
For a single page, yes in most cases. If you are compressing several pages into one file the per-page budget shrinks, and splitting is usually the better answer.
Size is only one check. Portals also enforce page count, dimensions and sometimes that the file is a genuine PDF rather than a renamed image. Re-read the error text.
No. The whole process runs in your browser using your own device's processing power. The file never leaves your device, which matters for identity and financial documents.
Neither. The tool is free to use with no account and adds nothing to your document.
300KB is a common allowance during counselling — JoSAA, NEET and state counselling rounds ask for marksheets, category certificates and rank cards, and this is often the per-file ceiling.
Counselling windows are short and a rejected upload can cost a round. It is worth checking the output opens correctly in a PDF reader before you submit it, rather than discovering a problem when the portal rejects the file.
A marksheet has small printed figures that a verifier has to read. 300KB is usually enough to keep them sharp — do not compress further than the portal actually requires.
Every compression pass discards detail permanently. Compressing an already-compressed file degrades it further for very little size gain. Always start again from your original scan rather than re-compressing the output of a previous attempt.
Upload limits change between notifications and differ by document type, so treat 300KB as the size you were asked for rather than a universal rule. The instruction sheet on your application portal is the authority; if it names a different figure, use the matching page below.
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Related: compress PDF (any size) · choose your own target · compress an image to KB