Redact PDF Tool

What is PDF redaction? 🔒

Redaction means hiding private information in a document before you share it. Picture a printed contract with marker over someone's bank account number, their full address, or their ID number. Redacting a PDF is the digital version of that marker.

But digital redaction has one big difference: it has to be permanent. If you just draw a black rectangle on top of text in a normal PDF editor, the text underneath is still there. Anyone can select it, copy it, or open the PDF in a text editor and read the original. That's how a lot of real-world leaks have happened — legal documents, court filings, and even government reports have leaked private data this way.

This tool takes a different approach. When you download, the entire PDF is rendered as flat images with your redaction boxes baked in. There is no text layer to recover. What you see is all that's there.

How to redact a PDF — step by step ✏️

1. Upload your PDF. Click the upload box or drag your file onto it. It stays on your device.
2. Pick the Redact tool. Click "Redact" in the sidebar. Your cursor becomes a crosshair.
3. Draw a box over anything private. Click and drag on the page. Release to lock the box in place.
4. Move or delete boxes. Switch to "Select" to drag a box to a new spot, or click the red ✕ to delete it.
5. Repeat on other pages. Use "Prev" and "Next" to jump between pages. Each page remembers its own redactions.
6. Download. Click "Download Redacted PDF." Every page exports with its redactions applied.

What to redact (and what to leave alone) 🤔

Common things people redact

• Bank account numbers and routing numbers
• Credit card numbers (except the last 4 digits if a company asks for them)
• Social Security numbers, national ID numbers, passport numbers
• Full home addresses and phone numbers
• Signatures and handwritten names
• Email addresses and login credentials
• Medical information — diagnoses, prescriptions, insurance IDs
• Trade secrets — pricing formulas, client lists, internal processes

Things people forget to redact

• Metadata. The author name, file creation date, and software used are stored separately from the page content. PDF.js ignores these, and the output doesn't carry them over.
• Headers and footers. Page numbers with account identifiers or document IDs get overlooked.
• Marginal notes. Handwritten annotations added by a reviewer can leak internal thoughts.
• Watermarks. Sometimes a watermark contains a client name or email.
• Hyperlinks. A link might have a tracking URL that reveals your email address.

Why use a browser-based redaction tool? 🔐

Most redaction tools make you upload the file to their server. That's a deal-breaker for anything confidential — medical records, legal documents, financial statements, HR records. You're handing the sensitive document to a stranger's computer.

This tool works differently. Your PDF stays on your device. The redaction happens inside your browser using PDF.js to read the file and jsPDF to write the new one. No uploads, no accounts, no data retention policies to worry about.

• No server uploads — your PDF never leaves your computer.
• No sign-up — no email, no account, no waiting.
• Works offline — after the page loads, you can turn off Wi-Fi and still redact.
• No watermarks — the output PDF is clean.
• Free forever — no ads inside the tool, no paywall.

Who needs to redact PDFs? 👥

• Lawyers and paralegals — Court filings often require redaction of personal identifiers. Missing one can result in sanctions.
• HR departments — Share a résumé without revealing the candidate's home address or phone number.
• Freelancers — Show sample work to a new client without exposing a previous client's private details.
• Accountants — Send tax documents to a client while hiding their Social Security number.
• Healthcare workers — Remove patient identifiers before sharing case studies or training materials.
• Anyone sharing a screenshot — Turn that screenshot into a PDF, redact the private bits, then send it.

Common problems and how to fix them 🛠️

"The download doesn't work"

This tool needs the jsPDF library to build the output file. If your browser blocked it, try a hard refresh (Ctrl+Shift+R or Cmd+Shift+R). If you're on a corporate network with strict Content Security Policy, the CDN might be blocked — try from a personal device.

"My redactions are in the wrong place"

Redactions are stored as percentages of the page. If they look off, they were likely drawn on one page and the underlying PDF has an unusual page size. Delete them and re-draw — the tool will use the correct coordinates.

"The file is huge after redacting"

The output PDF is image-based, so it can be larger than the original for text-heavy documents. To keep size down, redact in small batches, or compress the output afterward with our PDF Compressor.

"The redacted PDF is blurry"

We render at 2× scale for balance. Very large pages (A2 or bigger) may lose some sharpness. For critical documents, consider redacting a smaller crop or using a desktop tool.

Is this redaction permanent? ✅

Yes — for the output file. Here's why:

1. Each page is rendered to a canvas as pixels.
2. Your redaction boxes are drawn on top as solid shapes.
3. The combined image is embedded in a new PDF.

The resulting PDF has no text layer at all. The redacted content is truly gone — there's nothing underneath for anyone to select, copy, or recover with forensic tools. This is the same technique used by professional legal redaction software.

The trade-off: because there's no text layer, the output isn't searchable and can't be copied. That's the price of true redaction.

Tips for best results 💡

• Redact before you convert. If you're sending a Word doc, save as PDF first, then redact — not the other way around.
• Check every page. Flip through the whole PDF using Next/Prev. Sensitive info is often on page 2 or 3, not page 1.
• Cover slightly more than needed. Redact a bit wider than the text — that catches any edge pixels.
• Use white color for a cleaner look. Black is traditional, but white looks less jarring in reports.
• Save your original. Once you redact, the content is gone. Keep the unredacted version somewhere safe if you might need it later.
• Verify the download. Open the redacted PDF in your usual viewer and confirm nothing sensitive is visible.