You’re on the document upload step of a UPSC or SSC application, the deadline is close, and the portal just rejected your scanned certificate with no explanation beyond “file size not within allowed limit.” This has nothing to do with whether the certificate itself is valid — it’s a file-size problem, and it’s fixable in under a minute once you know the number to aim for.
Short version: UPSC and SSC are separate recruitment bodies with separate online systems, and their exact limits differ by form. But across both, 200KB clears the tightest common requirement — photo, signature, and most certificate PDFs included. That’s why it’s the number most candidates search for, and it’s what Compress PDF is built to hit exactly.
UPSC and SSC are not the same system
UPSC (Union Public Service Commission) runs the Civil Services Exam through a One Time Registration profile plus a Detailed Application Form at later stages, and issues separate standalone advertisements for non-CSE recruitment. Photo and signature uploads across UPSC’s forms are JPG/JPEG files in the tens of KB. Certificate uploads — caste certificate, PwBD certificate, age-relaxation proof — go through a document upload module that, on newer advertisements, allows more headroom per file than older forms did. The exact current figures are published in the instructions section of each advertisement on upsc.gov.in; they’re not identical across every notification, so the specific advertisement you’re applying against is what to check, not a generic “UPSC rule.”
SSC (Staff Selection Commission) runs CGL, CHSL, MTS, GD Constable, and several other exams through its own portal, each with its own notification. Photo uploads are JPEG in the 20-50KB range, signature in the 10-20KB range, fairly consistent across SSC notifications. Where SSC asks for a supporting document as a PDF — resident certificate, category certificate, disability certificate — several notifications cap that upload at 200KB specifically. The instructions annexure attached to each exam’s notification on ssc.nic.in carries the figure for your exact form, since SSC reissues that PDF every cycle and the number isn’t guaranteed to repeat.
Side by side, the fields and typical ranges look like this:
| Body | Field | Format | Typical size |
|---|---|---|---|
| UPSC | Photo | JPG/JPEG | tens of KB |
| UPSC | Signature | JPG/JPEG | tens of KB |
| UPSC | Certificates (caste, PwBD, age-relaxation proof) | varies by advertisement — check the notification | |
| SSC | Photo | JPEG | 20–50 KB |
| SSC | Signature | JPEG | 10–20 KB |
| SSC | Supporting certificate (resident, category, disability) | 200 KB on several notifications |
Neither body shows you the limit until you’re already stuck on the upload screen. But SSC’s 200KB certificate cap and UPSC’s small photo/signature files both sit inside a 200KB target, which is why it’s the safe default regardless of which form you’re on.
Why the rejection happens
Almost every oversized certificate traces back to the same two habits. The scan was done for print, not upload — a flatbed scanner or scanning app set to “best quality” captures a one-page certificate at 300 DPI or higher, a resolution built for reprinting, not for a reviewer reading it on screen. That setting alone can push a one-page file to 2-4MB, ten to twenty times over a 200KB cap. And the file got bundled or re-saved one time too many — merging two certificates into one PDF doubles what has to fit under the same ceiling, and every pass through a different scanning app or editor can leave behind extra embedded data (old revisions, unused fonts, color profiles) that adds kilobytes without showing up visually.
How to hit 200KB exactly
- Open Compress PDF — any browser, desktop or phone, nothing to install.
- Drop in the scanned certificate.
- Tap the NSP / CUET upload preset. It sets the target to 200KB — the figure that covers SSC’s certificate cap and clears UPSC’s photo/signature files. If your UPSC advertisement states a different figure, type that into the custom target field instead; the tool works the same way either way.
- It renders each page, re-encodes it as a JPEG at a given quality, checks whether the result lands under your target, and steps quality — and if needed, resolution — down until it fits, searching for the highest quality that still clears the number rather than just crushing the file.
- Download the result and check the reported size before uploading. It should read at or comfortably under 200KB.
Everything runs in your browser via JavaScript — the file never gets uploaded anywhere to be compressed, which matters given that category certificates and identity proof aren’t documents you want passing through a server you know nothing about. If the certificate is a normal scan, the result holds up well: it was already just a photograph with no selectable text, so a slightly lower JPEG quality costs little visually. Zoom into the seal and stamp on the compressed file before submitting — ten seconds of checking beats a resubmission two days before a deadline.
When a document won’t compress below a certain point
A certificate photographed or scanned as a plain page of text and a stamp has plenty of room to shrink at 200KB with no visible loss. A multi-page disability certificate or income-proof document packed with fine print is a different story — it genuinely cannot be crushed that far without the text starting to blur, and that’s a real tradeoff, not the tool failing. Compress PDF says so directly on the result screen rather than handing you a file that technically meets the number but won’t survive being read. A document that was typed directly into Word or downloaded as a digital PDF, never scanned, is usually already under 200KB on its own — if it’s still oversized, the cause is something other than image resolution.
If a dense, multi-page certificate won’t clear the target without becoming unreadable, check whether the form accepts it in parts, or use Split PDF to submit only the relevant page — a single page is almost always easier to compress cleanly than the full bundle.
If Compress PDF won’t open the file at all
That’s a different problem than an oversized file, and it’s worth telling apart. If the tool fails immediately with a generic error — before you even get to see a size — the certificate is almost certainly password-protected. Some state portals and DigiLocker downloads ship certificates encrypted by default, and Compress PDF reads pages with pdfjs, which can’t open a file that needs a password typed in first; it just fails rather than prompting you for one. Run the file through Remove a Password from a PDF with the correct password, then feed the unlocked copy into Compress PDF. If the file giving you trouble is actually your e-Aadhaar card rather than a certificate, that one is encrypted by default too, with a fixed, known password — see Compress PDF for Aadhaar Documents for what it is.
Before you submit
UPSC and SSC both reissue size and format requirements every recruitment cycle, and the numbers have shifted before. A 200KB target is safe across most of their forms, but confirming the figure on the actual advertisement you’re applying against costs five minutes and beats a rejected upload the night before the window closes. A few upload fields also enforce a floor as well as a ceiling — a file compressed well below what’s asked can get flagged as low-quality or corrupted just as often as an oversized one, so check the low end of your form’s stated range too, not only the maximum. And don’t combine documents to save an upload step — if the form has separate fields for category certificate and mark sheet, keep them as separate files; merging them doubles what has to fit under one ceiling.
If you’ve also got an NSP, CUET, or IBPS/banking form to deal with, the same approach carries over — see Compress PDF for NSP Scholarship Uploads, Compress PDF for IBPS and Bank Exam Applications, or My PDF Was Rejected for Wrong File Size if you’ve already hit a rejection. Start with Compress PDF, type in the number your form asks for, and check the result before you upload it — no account, no server, nothing leaving your device.