1. Exceeding exact file size ceilings (KB / MB limit).
Portals like NSP (200 KB), UPSC (300 KB), and SSC strictly enforce hard file size limits. Uploading a 205 KB PDF to a 200 KB portal ceiling triggers automated backend validation errors.
2. Password-protected or encrypted PDF files.
Government document verification bots cannot open PDFs protected with user passwords or restricted editing permissions. Ensure your PDF is unencrypted before uploading.
3. Wrong file format extension (.JPG uploaded as .PDF or vice versa).
Uploading a JPEG file renamed manually to '.pdf' will fail MIME-type server checks. Always use a proper document converter or native PDF export.
4. Blurry or illegible official seals & Roll Numbers.
Over-compressing an image to an extreme low resolution can smudge Tehsildar seals, QR codes, or marksheet Roll Numbers, resulting in manual verification rejection.
5. Document size below minimum KB threshold.
Portals like UPSC require documents to be at least 20 KB (between 20 KB and 300 KB). Compressing a 1-page text file down to 12 KB will cause a 'file too small' validation error.
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Use Zcompressor's zero-server, 100% private browser compressor.
Frequently Asked Questions.
How can I test if my compressed PDF is acceptable before submitting?
Open the compressed PDF in your device PDF viewer, zoom in to 100%, and verify that your Roll Number, Name, and seals are clear and unencrypted.