Redact PDF
Black out names, numbers, and other sensitive information in a PDF — free and entirely in your browser. Redacted pages are flattened to images so the hidden content is truly removed, not just covered.
How to redact a PDF
- Add your PDF. Drag and drop the document onto LambiPdf, or click “Choose files.”
- Open the Redact tool and drag a black box over each piece of sensitive text or imagery.
- Apply & save. On save, redacted pages are rasterized (flattened to an image), so the covered text can't be copied or recovered.
Real redaction, done privately
Simply drawing a black rectangle in some editors still leaves the original text underneath, where it can be copied or extracted. LambiPdf flattens each redacted page to an image so the underlying content is genuinely gone. And because it all happens in your browser, the confidential document is never uploaded to a server.
More free PDF tools
Redact PDF — FAQ
Does the redacted text really get removed?
Yes. Redacted pages are flattened to images on save, so the covered text is no longer present as selectable/extractable content.
Is my document uploaded?
No. Redaction happens entirely in your browser; the file never leaves your device.
Is redacting PDFs free?
Yes — free, no sign-up, no watermark.
Can I redact several areas across pages?
Yes. Draw as many boxes as you need on any pages, then apply and save once.