Large source file
The PDF is made from scanned images rather than selectable text.
Readable PDF compression guide
Reduce PDF Size Without Losing Quality
Most people do not just need a smaller PDF. They need a PDF that is small enough to upload while still keeping text, IDs, stamps, and signatures readable.
Last verified: July 18, 2026. Compression quality depends on the source file, scan resolution, images, fonts, and the portal limit. No tool can guarantee every PDF will hit every target without quality tradeoffs.
Install onceBrowser workflowNo server storage
Why the upload failed
Upload errors usually come from files that are just over the limit, exported in the wrong format, or created from high-resolution scans and phone photos.
Upload target
The file needs compression but must remain acceptable for official review.
Portal mismatch
Over-compression can blur IDs, stamps, signatures, or certificate numbers.
Manual fix, then permanent fix
Start with a moderate compression target, inspect the output, and avoid reducing scan quality below the point where reviewers can read the document.
Auto Compress helps prepare smaller files in Chrome and keeps the privacy story aligned with sensitive documents.
Check the prompt
Use the latest file-size and format rule shown by the upload portal.
Prepare a smaller file
Compress carefully so the document remains readable.
Upload normally
The destination website receives the smaller file. Auto Compress does not store it for compression.
Related backlinks
Useful Auto Compress guides
One extension for recurring upload limits