You’ve filled out the National Scholarship Portal application, you’re on the document upload step, and the form won’t accept your file. No real explanation — just a red error line saying the file is too large. This happens to almost everyone who scans their own documents instead of getting them done at a CSC that already knows the trick.
Short version: NSP wants most documents at 200KB or under, your scan is probably 10-20x that size because scanners default to settings built for printing rather than uploading, and the fix takes under a minute once you know the target number.
What NSP actually requires
According to the official FAQ published on scholarships.gov.in (the DEPDFAQ.pdf document), document uploads on the National Scholarship Portal fall somewhere between 20KB and 500KB depending on the document type — but in practice, 200KB is the number that covers nearly everything: income certificates, caste certificates, bonafide certificates, previous marksheets, bank passbook scans, Aadhaar copies. A few document types on some state scheme forms allow more room, up to 500KB, but if you don’t see a specific number next to the upload field you’re looking at, 200KB is the safe assumption and the one that will clear the most forms without you having to dig through a PDF buried on the portal’s help page.
This matters because NSP doesn’t tell you the number at the point of failure. The upload box just rejects the file. You find out the actual limit from the FAQ document, from a help forum, or by trial and error — which is a bad way to spend the last hour before an application deadline.
One more thing worth knowing: these numbers do get revised between academic years, and NSP isn’t the only portal you might be dealing with. If you’re also applying through a state scheme — UP, Bihar, MP, or Maharashtra’s MahaDBT — those run on separate portals with their own limits, which don’t always match NSP’s. Compress PDF for State Scholarship Portals covers what’s currently known for each.
Why your file is rejected in the first place
There are really only three reasons a document fails NSP’s upload, and they compound on each other.
The scan resolution is higher than it needs to be. A phone camera or flatbed scanner set to “best quality” captures a certificate at 300 DPI or higher, treating it like a photograph meant to survive printing at poster size. For a document that exists purely to be read on screen by a portal reviewer, that’s overkill. A single page scanned this way can easily land at 2-4MB — ten to twenty times NSP’s cap before you’ve done anything else to it.
The file carries large embedded images instead of compressed ones. If you scanned into a PDF using a scanning app, or photographed the document and converted it, the image inside is often stored uncompressed or lightly compressed. Two or three pages of this adds up fast, especially if one is a passport-style photo pasted in at full camera resolution.
Leftover metadata and multiple re-saves bloat the file quietly. Every time a PDF gets opened, annotated, or re-exported by different software, it can pick up extra embedded data — old revisions, color profiles, unused font subsets. None of this is visible when you open the file, but it adds real kilobytes, which is why two documents that look identical on screen can differ in size by a factor of three.
Put those together and a one-page certificate that should weigh 100-150KB as a clean scan ends up at 3MB — 15 times over NSP’s stated limit.
Two things you can fix before you ever open a compressor. If you’re scanning the document yourself rather than starting from a file someone else sent you, set the scanner or scanning app to black-and-white or grayscale mode instead of color. Certificates and marksheets are printed text on white paper — there’s no color information worth keeping, and dropping it means the compressor has less data to throw away later to hit 200KB, which usually means a sharper result at the same size. And if your scan came out with a blank page at the end (common with flatbed scanners and double-sided settings) or a duplicate page, pull it out with Remove Blank Pages or Delete PDF Pages before you compress. The NSP preset targets 200KB for the whole file, not per page, so a stray blank page is real byte budget you’re giving up for nothing.
How to compress to exactly 200KB
This is the part that should take under a minute.
- Open Compress PDF in any browser — desktop or phone, nothing to install.
- Drop in your scanned document or certificate.
- Tap the NSP preset. It’s a one-click button that sets the target size to 200KB for you, so you don’t have to know or type the number yourself.
- The tool renders each page, re-encodes it as a JPEG at a starting quality level, checks whether the result lands at or under 200KB, and if it doesn’t, tries a lower quality pass — repeating until it finds the highest quality that still fits the target. If quality reduction alone can’t get there, it also shrinks the page resolution slightly and searches again.
- Download the result and check the reported final size before you upload it to NSP. It should read at or comfortably under 200KB.
Everything runs in your browser using plain JavaScript — the file never leaves your device, which is worth knowing given that these are income certificates, caste certificates, and identity documents, not random PDFs you’d want sitting on someone else’s server. There’s no account to create and no file to wait on a server to hand back to you.
If your document is a clean scan — which almost all NSP uploads are — this works cleanly. The page was already just a photograph of printed text with no underlying selectable text to lose, so dropping it to a lower JPEG quality costs you almost nothing visually while cutting the file size dramatically. Zoom in on the compressed result before submitting, just to confirm stamps, signatures, and small print are still legible. Ten seconds of checking beats a resubmission.
When a document won’t compress that far
Occasionally someone uploads a document that was never scanned at all — a bonafide certificate typed directly into Word and exported as a PDF, or a marksheet downloaded as a digital PDF from a university portal. These are text-based documents, and the mechanism above only has something meaningful to compress when there’s an image to shrink.
The target-size compressor works by rasterizing every page into a JPEG and searching for the quality level that fits your number. A scanned page is already an image, so this is a near-lossless trade. A genuinely text-based PDF doesn’t have much image weight to remove in the first place — it’s often already under 200KB on its own, and if it isn’t, compressing it further means pushing JPEG quality down hard enough that fine print starts looking rough. There’s a floor below which a rasterized page of dense text stops being legible, no matter how the encoder is tuned.
If Compress PDF tells you honestly that it couldn’t hit 200KB without quality dropping below a usable point, that’s a real signal, not a bug — it’s the tool refusing to hand you a file that technically uploads but reads as a blur once NSP’s reviewer opens it. In that situation, check whether the document actually needs to be a scan at all. A bonafide certificate or marksheet you can export directly as a clean digital PDF, rather than printing and rescanning it, will almost always come in under 200KB on its own, with nothing to compress.
For everything else — the certificates, passbooks, and ID copies that make up most of an NSP application — the NSP preset in Compress PDF gets you to 200KB in one pass, with the file never leaving your browser.
Your photo and signature are a separate upload, not a document
NSP’s application form doesn’t only ask for certificates — it also has its own boxes for a passport-style photo and a scanned signature, and those follow a different rule than the 200KB you’re targeting for your documents. Across NSP and the state portals that mirror its format, photo and signature uploads sit at the tight end of the size range and are usually expected as a plain JPG, not a PDF. If you’ve been scanning your photo into a PDF along with your certificates and wondering why it still won’t upload, that’s likely why — the portal wants that field filled with an image file, not a document.
Compress PDF is built for PDFs, so it isn’t the right tool for shrinking a JPG photo or signature directly. If you do need to get a photo or signature into PDF form for some other part of your application, JPG to PDF handles that conversion; but for the photo and signature fields themselves, check the exact format and size the form asks for at that specific box before you upload, since it’s genuinely a different requirement from the document uploads covered above.