Where you'll meet a 100 KB PDF limit
100 KB is one of the most common, and most frustrating, limits on online application forms. Government recruitment portals, public service and exam registration sites, university admissions and scholarship applications often cap each uploaded document at 100 KB. The documents they ask for are usually scans:
- School, college and degree certificates, and result cards
- National ID cards such as a CNIC or Aadhaar, and passport pages
- Domicile, character and experience certificates
- Single-page forms that you print, sign and scan back in
Always read the portal's own instructions for the exact limit and accepted format. Some systems count a kilobyte as 1,000 bytes and others as 1,024, so a file of exactly 100 KB can be rejected on one site and accepted on another. Setting the target to 95 KB gives you a small safety margin.
What realistically fits in 100 KB
100 KB is small: a single photo straight from a phone camera is many times larger. To get a scanned document that low, the pages usually have to be compressed as images (the Maximum approach) at a reduced resolution. Printed text stays readable, but it can no longer be selected or searched, which doesn't matter for a portal that only needs to view the document.
| Your document | Can it reach 100 KB? |
|---|---|
| One scanned page (certificate, ID card or letter) | Usually yes, and still clearly readable |
| ID card front and back on two pages | Usually yes |
| Three or four scanned pages | Often, though the text gets softer |
| Short PDF created digitally (from Word or a website) | Often already small; light compression may be enough |
| Ten or more scanned pages | Unlikely while staying readable; reduce the pages |
If your PDF won't go under 100 KB
- Upload only the pages required. If the form wants the first page of a certificate or the photo page of a passport, extract just that page with Split PDF and compress it.
- Use separate upload slots. Where a portal has one field per document, upload each document as its own PDF rather than one combined file.
- Rebuild PDFs made from phone photos. Recreate the PDF with JPG to PDF on the Small file setting, then compress it again.
- Crop before converting. A photo with a desk or carpet around the document wastes kilobytes on background you don't need.
- Check the limit. If 100 KB truly can't hold your document, see whether the portal allows a larger file: our compress PDF to 200 KB page covers multi-page documents.
Scanning tip: greyscale at 150 DPI
Most oversized PDFs start at the scanner. Colour scans at 300 or 600 DPI create huge files that then have to be crushed to fit. For printed text, greyscale at 150 DPI is clearly readable and produces a much smaller starting file, so the compressed result looks sharper.
If a portal specifically asks for a colour scan, for example to show a stamp or signature in its original ink, keep colour but stay at 150 DPI.
Your ID scans never leave your device
Scans of a CNIC, passport or degree certificate are exactly the files you shouldn't scatter across random websites. This compressor runs inside your browser, so the PDF is processed on your own phone or computer and isn't uploaded to our servers or anyone else's. KBSnap can't promise that a portal will accept your file, but it can make sure the file you upload is the only copy that leaves your hands.