Can you redact a scanned PDF?

Yes. Run OCR to add a text layer, mark sensitive content, then apply permanent redaction.

Why can't I select text on my scanned PDF?

The page is likely an image without a text layer. OCR converts visible text into searchable spans.

Does OCR make redaction permanent?

OCR enables marking. Permanent removal happens when you apply redaction and verify the export.

How to Redact a Scanned PDF (OCR + Redaction Guide)

Quick answer

A scanned PDF is often a picture — no selectable text, no PII auto-detect, no search until you run OCR. In RedactPDF: upload → Run OCR on image pages → mark with detect + search + boxes → apply → verify. OCR does not replace permanent redaction; it unlocks marking. Full workflow: redact PDF online free.

Scanned vs digital PDFs

Born-digital PDFs usually have text you can highlight. Fax exports, copier scans, and phone photos saved as PDF often do not. If the editor shows an OCR prompt or you cannot select words, treat the page as image-first.

Hybrid PDFs (Canva exports, some bank downloads) mix text and image layers — mark per page; use secure page mode on sensitive hybrid sheets when the whole background is sensitive.

Step 1 — Run OCR

Open RedactPDF and upload the scan
On pages without text, tap Run OCR
Wait for recognition (engine loads from CDN — internet required)
Confirm search and highlights work when marking

Quality depends on resolution, skew, and handwriting. Garbled OCR needs larger manual boxes over whole lines. Handwriting recognition is limited — box the region visually.

Step 2 — Mark sensitive content

After OCR:

PII auto-detect for emails, phones, cards, SSN patterns — auto redact guide
Search for names and case IDs OCR recognized
Manual boxes on signatures, stamps, faces, barcodes, OCR misses

Zoom low-confidence regions. Headers repeat on every page — do not stop at page one.

Step 3 — Apply and verify

Apply as with digital PDFs. On the downloaded file:

Search known strings
Try select under redacted areas
Paste to Notepad

Failure means re-mark and re-apply. Why overlays fail: why blacking out is not safe.

Common scan redaction mistakes

Black box in a photo editor without touching PDF structure. OCR skipped because "it looks like text." Assuming one page's OCR covers the whole file. Sharing before verification.

Use cases

Medical chart scans (HIPAA guide), signed contracts, immigration documents, legacy HR files. Court exhibits: redact PDF for court.

Related guides

Redact your scan now

Open RedactPDF, OCR first, mark, apply, verify. Scanned PDF redaction works when the file knows what text exists — then you remove it for real.

Disclaimer: This guide is for information only. For legal advice, consult your attorney.