How to black out sensitive info on a PDF before sharing

What people are asking

r/pdf (“black highlight can be recovered”), r/LawFirm (“best way to redact”), r/paralegal (“test your redaction”).

The failure mode is “it looked black on my screen” and the SSN still copies. The fix is boxes + a 30-second spot-check.

What Redact PDF actually does

• Let you draw, move, resize, and delete solid black rectangles on each page.
• Burn those rectangles into the exported PDF pages.
• Run locally in the browser.

What it does not do

• Adobe-style “Remove Hidden Information” certified redaction that deletes text objects from the content stream.
• Search-and-redact every SSN automatically across 1,500 pages.
• Guarantee forensic non-recovery for court-sealed productions—always verify; use a certified workflow when rules require it.

Steps

1. Open Redact PDF.
2. Draw boxes over each sensitive region; overlap slightly.
3. Export, then test: try to select/copy over the black areas and search the file for the hidden string.
4. For higher-stakes sharing, also consider flattening or rasterizing after legal review.

Related guides

Redact a PDF for sharing · Black out text in a PDF · Hide sensitive info in a PDF

Go deeper

Scenario guides hub · Open Redact PDF · All PDF tools · Privacy

Last updated 2026-08-20 · Research-backed long-tail