What UPSC actually requires for PDF uploads
The UPSC online application portal (upsconline.nic.in) enforces a 300KB limit per PDF file. This applies to every document you attach during the Detailed Application Form (DAF) stage — your degree certificate, caste certificate, mark sheets, service certificate and any other supporting document.
The key specifications from UPSC notifications:
- Format: PDF only (not JPG, PNG or Word)
- File size: maximum 300KB per document
- Legibility: the text must be clearly readable after compression
- Multi-page documents: each file must still be under 300KB total
The 300KB limit applies per document — not total. If you are uploading five certificates, each one must individually be under 300KB. The portal checks file size automatically and will reject any file that exceeds the limit before allowing you to proceed.
Which documents need to be compressed
| Document | Typical scan size | Target after compression |
|---|---|---|
| Graduation degree certificate | 1–3 MB | Under 280KB |
| Class 10 and 12 mark sheets | 500KB–2MB | Under 280KB |
| Caste / OBC / EWS certificate | 800KB–2MB | Under 280KB |
| Disability certificate | 500KB–1.5MB | Under 280KB |
| Service / NOC certificate | 500KB–2MB | Under 280KB |
Passport-size photos and signature scans have separate requirements (JPG format, 3KB–40KB). Use Photo Size Fixer for those — this guide covers PDF documents only.
Step-by-step: compress a UPSC PDF to under 300KB
The method below uses PDF Vault's browser-based compressor. Your file never leaves your device.
1Check your original file size first
On Android: open Files app, long-press the file, tap Details. On iPhone: in Files app, press and hold the file and look at the info panel. On Windows: right-click and select Properties. Note the size in KB or MB — this tells you how much compression you need.
2Open the PDF compressor
Go to pdf-vault.com/tools/compress-pdf/. Works on Chrome for Android, Safari for iPhone, and all desktop browsers. No app or account required.
3Upload your PDF
Tap "Choose PDF" or drag and drop. A preview of the first page appears along with the original file size, so you can confirm you have the right file.
4Choose compression level
For text-heavy certificates and mark sheets, start with Medium. This reduces file size by 40–65% while keeping all text clearly readable. A 1MB certificate typically becomes 300–500KB. If still over 300KB, switch to High, which brings most 1MB files to 150–250KB.
5Check the result size and readability
The result screen shows the new file size. Aim for under 280KB to have a safe margin. Before downloading, open the result and zoom in on the text — all names, dates, certificate numbers and authority stamps must be legible. If text has become blurry, re-compress from the original using Medium instead of High.
6Download and upload to UPSC portal
Download the compressed PDF. Do not rename it from something long to something short — UPSC portals sometimes reject files with very short names. Keep the descriptive filename (e.g. degree_certificate_compressed.pdf).
Compress Your UPSC Document Now
Free, browser-only. Files never uploaded to any server. Works on Android and iPhone.
Open PDF Compressor →What if the file is still too large after compression?
Use PDF Size Fixer with a precise target: Go to PDF Size Fixer and enter 280 in the KB field. The tool automatically finds the right compression level to hit your exact target — more reliable than trial-and-error with compression levels.
Re-scan at a lower DPI: If you have access to a scanner, rescan the document at 150 DPI in greyscale mode. A 150 DPI greyscale scan of a one-page certificate typically produces a PDF of 80–180KB before any compression — well under the 300KB limit without any post-processing.
Split multi-page documents: If a multi-page certificate is too large even at High compression, use Split PDF to separate it into individual pages, compress each page separately, then check the current UPSC notification to see whether separate page uploads are permitted.
Remove the password first if protected: University-downloaded mark sheets and government certificates are often password-protected. A locked PDF cannot be compressed. Unlock the PDF first, then compress it.
Common mistakes to avoid
Uploading a JPG instead of PDF: UPSC requires PDF format for certificates. If you only have a JPG scan, convert it to PDF first, then compress the resulting PDF.
Not checking the result size: Always read the file size shown on the result screen before downloading. If it still shows 420KB, do not download — compress again at a higher setting.
Compressing the same PDF multiple times: Multiple rounds of compression degrade quality significantly. Always compress from the original scanned file, not a previously compressed version.
Using a 300KB target without margin: Aim for 280KB. Some portals measure in binary KB (1 KB = 1024 bytes), which means a file showing 295KB on your device might register as 302KB on the portal.