Redact PDF Documents
Hide sensitive text and images.
Flint's Redact PDF tool permanently removes sensitive content from a PDF — the text and images underneath each black box are stripped from the file itself, not just visually masked. That distinction matters: a real redaction protects against copy-paste, search, and any tool that re-extracts the original layer.
- Drag to mark anything — names, account numbers, signatures
- Boxes are kept per page, easy to add or remove individually
- Apply all redactions at once into a new version
- Browser-based — no install
- Files private to your account
- Up to 250 MB on Pro
How it works
Right in your browser, no install
Flint PDF runs entirely in your browser. Drop a file in, do the thing, get the file out.
- 1
Open your PDF
Load a PDF into Flint's editor and switch to the Redact tool from the inspector.
- 2
Drag to mark content
Click and drag across any names, numbers, signatures, or images you want to remove. Boxes can be added or removed individually per page.
- 3
Apply redactions
When the markings look right, apply them in one pass. Flint produces a new version of the document with the underlying content removed.
- 4
Export the redacted file
Download the new version with a Pro plan when you're ready to share it.
What it's for
Built for real work
Share a contract safely
Black out salary figures, account numbers, or personal details before sending a contract to a third party.
Prepare records for FOIA or discovery
Remove privileged or personally identifiable information from documents before releasing them in legal or compliance workflows.
Anonymize a case study
Strip names, logos, and identifying numbers from a real document so it can be used as a public example.
FAQ
Frequently asked questions
- Is the redaction actually permanent?
- Yes. Flint removes the text and image content underneath each redaction box from the PDF itself. The original content isn't recoverable by copy-paste, search, or extraction tools.
- How is this different from drawing a black rectangle?
- A drawn rectangle only covers content visually — the original text is still in the file and can be selected or extracted. Flint's redact tool removes the underlying content entirely.
- Is the redact tool free?
- You can try the redact tool free in the browser. A Pro plan is required to download or export the redacted PDF.
- Are my files private?
- Yes. Redaction happens locally in your browser, so the sensitive content never leaves your machine during processing.
- Do I need to install anything?
- No. Flint runs in a modern web browser — there's no app to install or account required to try the tool.
- What's the maximum file size?
- Pro accounts support PDFs up to 250MB. Larger files depend on the memory your browser has available.
- Can I redact images as well as text?
- Yes. Drag a box over any region — text, images, signatures, or scanned content — and the underlying data is removed when you apply the redactions.
More from Flint PDF
More PDF tools
Built browser-side, share the same editor.
Edit
Change what's on the page.
Organize
Rearrange or combine pages and files.
Merge PDF
Combine multiple PDFs into a single document.
Split PDF
Cut a PDF into one or many smaller files.
Reorder PDF Pages
Drag pages into the order you actually want.
Rotate PDF Pages
Spin selected pages 90°, 180°, or 270° in one click.
Delete PDF Pages
Remove pages from a PDF — single pages or whole ranges.
Export
Optimize or convert for sharing.