Redact PDF
SecurityPermanently cover confidential information with solid black boxes before sharing your PDF. All redaction happens locally in your browser.
How to use Redact PDF
- Open this page in any modern web browser — no download or installation required.
- Click Add file or drag and drop your PDF onto the drop zone.
- Adjust the available settings to fit your needs.
- Click the action button and save the processed file — the result is ready instantly.
Files never leave your browser. No upload to any server.
Processing runs locally on your device. No queues, no waiting.
No signup, no watermarks, no limits. Use as many times as you like.
Why use Redact PDF on PDF Modern?
PDF Modern’s redact pdf tool processes your file entirely within your web browser using modern WebAssembly technology. Unlike traditional online PDF services that require uploading your documents to remote servers, your files never leave your device — ensuring complete privacy and security. Processing happens at the full speed of your CPU, not limited by upload or download bandwidth, so even large files are handled in seconds. There are no file-size restrictions, no daily usage caps, no watermarks on output, and no account creation needed. It is a fully free, open tool built for everyday document workflows at home, school or the office.
Frequently asked questions
Is the redaction permanent?
The redaction draws an opaque black rectangle over the area. For maximum security on highly sensitive documents, run the redacted PDF through the Compress PDF tool to flatten the page into an image.
Can I redact in multiple places?
Yes — drag as many redaction boxes as you need on each page.