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How to Upload a Scanned Document When a Form Rejects It

Published March 20, 2026 · Updated March 20, 2026 · 4 min read

Scanned documents get rejected for three main reasons: the file format isn't accepted, the file is too large, or the image quality is too low. Each has a specific fix.

Format mismatch

Scanners save files in different formats depending on settings: TIFF, PDF, JPG, or PNG. Forms have their own accepted format lists. The mismatch is common.

If the form wants PDF: most scanner apps can save directly to PDF. If yours saved as TIFF, JPG, or PNG, use an image-to-PDF converter to wrap it in a PDF. The resulting PDF displays the scan exactly as-is.

If the form wants JPG or PNG: convert from TIFF or PDF to JPG. A TIFF-to-JPG conversion produces a much smaller file with no visible quality loss for scanned documents at typical dpi settings.

If the form rejects TIFF: TIFF is a professional-grade format that most consumer upload forms don't support. Convert to JPG or PDF before uploading.

File too large

Scans at high DPI settings produce large files. A 600 DPI scan of an A4 page as TIFF is 30–50 MB. The same scan as PNG is 5–10 MB. As JPG at 80% quality, it might be 200–500 KB.

For most upload purposes — submitting a document for review, uploading to a portal — 150 DPI is sufficient for printed text. 200–300 DPI is fine for most professional uses. 600 DPI is overkill for documents and only necessary for detailed photographs or archival purposes.

If you've already scanned at high DPI, convert to JPG (which compresses much more efficiently than PNG or TIFF) and the file size problem usually resolves itself.

Quick size fix: JPG at 80% quality handles document scans well. The text remains legible, the file size drops dramatically, and most forms accept JPG without complaint.

Image quality issues

Some forms use automated validation that checks whether the uploaded document is legible — particularly for government ID documents and financial records. If a form rejects a scan as "too blurry" or "unreadable," the issues are usually:

DPI too low (below 150 DPI for text documents)
Camera angle during scanning (not flat on the scanner)
Poor lighting when photographing a document
Over-compression when converting (JPG at quality below 60%)

Re-scan at 200–300 DPI with the document flat on the scanner glass. Convert to JPG at 80–90% quality. This resolves most quality rejections.

Multi-page documents

If your scanned document has multiple pages, combine them into a single PDF before uploading. Most upload forms expect a document as a single file, not a ZIP of images. Most scanner apps have a "multi-page scan to PDF" option. If you have separate image files, an image-to-PDF converter can combine multiple JPG or PNG files into a single PDF.