PDF guide

How to Prepare Documents for Online Forms

Reviewed and updated August 21, 2026

Portals reject uploads for wrong format, size, or readability.

Checklist

  • PDF format required? Use Word to PDF or JPG to PDF
  • Size limit? Use Compress PDF
  • Multiple files allowed? Merge PDF
  • Readable text? Use OCR PDF for scans

Record every upload requirement

  • Accepted extension, such as PDF or JPG
  • Maximum file size and page count
  • Required orientation or dimensions
  • Color or grayscale requirement
  • Filename rules and prohibited characters
  • Whether multiple documents must be combined

Use a reliable preparation order

  1. Convert source files to the required format
  2. Rotate, crop, and organize pages
  3. Merge documents when one file is required
  4. Add page numbers or a signature if requested
  5. Compress the final copy
  6. Open and verify the exact file you will upload

Troubleshoot common portal errors

A generic upload failure may be caused by size, filename, encryption, connection timeouts, or an unsupported file structure. Try a short filename, confirm the downloaded PDF opens, remove password protection when the portal forbids it, and use the official help contact when the error continues.

Frequently Asked Questions

Why does the portal reject a PDF that opens normally?

The file may exceed a hidden limit, use an unsupported encryption or PDF version, or have a filename the portal cannot parse. Check the official requirements first.

Should I upload the original or compressed file?

Upload the verified file that meets the portal instructions. Keep the higher-quality original separately for your records.