Sharing a contract, bank statement, medical form, or court document usually means hiding a few pieces of sensitive information first — a name, a Social Security number, an account number. The safe way to do that is redaction: permanently removing the content, not just hiding it. And you can do it free, in your browser, without Adobe Acrobat or any signup.
Go straight to the tool: Redact PDF — permanently black out or mask sensitive text in your browser, free, files never uploaded.
This guide explains the one mistake that leaks redacted data, how to redact or mask a PDF properly, and when it matters most.
The mistake that leaks "redacted" data
Here's the trap: people open a PDF editor, drop a black rectangle over sensitive text, and assume it's gone. It usually isn't.
In most PDFs, that black box is just a shape drawn on top of the text. The original words are still in the file. Anyone can:
- select and copy the text hidden under the box,
- move or delete the box,
- or extract the raw text with a free tool.
This has caused real-world leaks — courts, agencies, and companies have all published "redacted" documents where the hidden text was one copy-paste away. Covering is not redacting.
True redaction removes the underlying content so there's nothing left to recover. That's the difference between masking that looks secure and masking that is secure.
How to redact (or mask) a PDF the right way
Whether you call it redacting, masking, blacking out, or censoring, the goal is the same — and the method is simple:
- Open the Redact PDF tool.
- Upload your PDF — drag and drop or click to select.
- Draw a box over each piece of sensitive text — names, numbers, addresses, signatures. Add as many boxes across as many pages as you need.
- Download the redacted PDF. The content under each box is permanently removed, not just covered.
Because the tool runs entirely in your browser, the document is never uploaded to a server. For sensitive files — legal, medical, financial — that local processing is exactly what you want.
Redacting vs masking: same job, one important rule
"Redact" and "mask" get used interchangeably. Both mean "hide this so no one else can see it." The rule that actually matters isn't the word — it's whether the content is removed or merely hidden.
- Done right: the sensitive text is deleted from the file. Copying, extracting, or reopening the document reveals nothing.
- Done wrong: a coloured box sits over readable text that's still in the file.
A dedicated PDF redaction tool does it right by default, so you don't have to think about the underlying PDF structure.
When redaction matters most
Legal and court filings. Personal identifiers, witness details, and privileged information often must be removed before filing or sharing.
Financial documents. Bank statements, tax forms, and invoices frequently need account numbers, balances, or client details hidden before they're sent on.
Healthcare records. Protected health information (PHI) must be removed to share records safely — a core requirement for HIPAA-conscious workflows.
Job applications and HR. Sharing a reference document, offer letter, or payslip? Redact salary figures, IDs, and contact details first.
Anything you post publicly. Screenshots and PDFs shared online are permanent. Redact before you publish, not after.
Common questions
"Can I redact more than one page?" Yes — add redaction boxes across every page of the document before downloading.
"Will the rest of the document change?" No. Only the areas you box out are removed. The remaining text, images, and layout stay exactly the same.
"Is it really free, with no watermark?" Yes. No signup, no watermark, no limit on how much you redact.
"Can I do this on my phone?" Yes. The tool works on phones and tablets — touch and drag to select the text you want to remove.
"What about metadata?" Redaction removes the visible content you box out. If a document also carries sensitive details in its metadata (author, title), remove those separately before sharing.
The fastest, safest way to do it
If you just need it done: open Redact PDF, upload your file, box out every sensitive detail, and download. It's free, works without Adobe, and the file never leaves your browser — so masking a PDF is both effortless and genuinely secure.
A few related free PDF tools that pair well with redaction:
- Unlock PDF — remove a password so you can edit or redact a protected file.
- Merge PDF — combine redacted pages with other documents.
- Compress PDF — shrink the final file for email or upload.
Redacting a PDF shouldn't require expensive software or risky uploads — and it definitely shouldn't leave the "hidden" text one click away. Remove it properly, keep the file on your device, and share with confidence.