Reviewed 2026-08-28
PDF OCR Page by Page in the Browser
Render selected pages locally and recognize them sequentially at controlled DPI.
Example input
Scanned PDF; pages 1-3; 216 DPI
Expected output
===== Page 1 ===== Recognized text
Reproducible method
- Preserve the original and create the smallest representative sample.
- Run a strict parse or validation before transformation.
- Record options, compare counts and structure, then test in the receiving system.
Common error
Encrypted files, extreme DPI, and complex layouts can fail.
Reduce a failure while retaining the problematic structure; this separates malformed input from unsupported behavior.
Technical limitation
Plain-text OCR does not preserve tables or exact reading order.
A successful preview does not remove format ambiguity or downstream requirements.
Security and privacy
The PDF stays local; release canvas and worker memory after each job.
Local processing reduces transfer risk but cannot protect a compromised browser, unsafe extensions, clipboard history, or later misuse.
Verification checklist
- Check field, record, page, or byte counts.
- Review edge cases and error output.
- Retain the original until acceptance.
- Document assumptions for automation.