Redact PDF
Permanently remove sensitive information from your PDF.
What is Redact PDF Document?
Permanently redact sensitive text and areas from PDF files. Irreversibly flattens content with zero server uploads for total document confidentiality.
When should you use it?
This tool is useful when you need to encrypt, unlock, sign, compare, or cover sensitive areas of a PDF.
How Redact PDF Document handles your file
Pages are rendered to a canvas in your browser, the redaction boxes are painted onto the raster, and each page is re-embedded as an image — so the covered text and vector data are genuinely gone. Nothing is uploaded.
Your device's own CPU does the work, so there is no upload wait and no server-side copy of your document to retain.
Good to know before you convert
- Redacted pages are flattened to images. This is what makes the redaction irreversible, but it also means all text on a redacted page becomes non-selectable — including the text you did not cover.
- File size grows, because every redacted page is stored as a 2× resolution image rather than as text and vectors.
- Text Search only matches pages that have a real text layer. Scanned pages will report no matches.
- Page Region mode applies the same percentage-based rectangle to every page, so it suits consistent forms rather than one-off areas.
- The text search matches whole text runs rather than exact phrases, so a match can cover slightly more than the words you typed.
How to use Redact PDF Document
Upload the PDF document containing sensitive information.
Choose 'Text Search' and type the words to remove, or 'Page Region' and set the rectangle as a percentage of the page.
Click 'Redact PDF!' to flatten each page with the covered content destroyed, then download the result.
Why choose PdfPix for Redact PDF Document?
Private by design
The file is never uploaded. Everything happens inside your browser tab, so there is no remote copy of your document to leak, retain, or subpoena.
No File Size Limits
Because conversions run locally using your computer's CPU power, we don't impose any artificial file size caps, queue delays, or wait times.
100% Free Forever
Get full access to all features without subscriptions, credit card inputs, or registration walls. No branding watermarks added to your outputs.
Universal Compatibility
PdfPix runs smoothly inside any modern browser on macOS, Windows, Linux, iOS, or Android, without needing external applications or plugins.
How PdfPixCompares to iLovePDF & Smallpdf
Unlike traditional cloud PDF services that upload your confidential documents to remote servers, PdfPix processes your files 100% in your browser. No file size paywalls, no task queues, and zero remote data retention.
Frequently Asked Questions
Is the redacted content really gone?
Yes. Unlike tools that simply draw a black rectangle over the page, PdfPix renders each page to a canvas, paints the redaction onto that raster, and then re-embeds the page as an image. Because the original text and vector objects are never written to the output, the covered content cannot be copied, searched, or recovered with a text-extraction tool. This is the difference between hiding information and destroying it.
Does redacting affect the rest of the page?
Yes, and this is the trade-off. Because a redacted page becomes an image, every other word on that page also stops being selectable text. If you need to keep a live text layer across the document while removing one sensitive sentence, you need a tool that rewrites the content stream rather than rasterising the page.
Why does the file get larger?
Each redacted page is stored as a 2× resolution PNG instead of text and vector instructions. That guarantees the covered data is gone, but images take more bytes than text, so a heavily redacted document will grow.
Can I redact images as well as text?
Yes. Region mode covers whatever is inside the rectangle, including photographs, logos, and drawings, and those pixels are destroyed along with the rest of the page raster.
Why did Text Search find nothing?
Text Search reads the PDF's text layer, so it only works on documents that contain real text. A scanned PDF is a picture of a page and has no text layer to match against. Use Page Region mode to cover areas of a scan instead, or run the scan through OCR software first.
Is my document secure while redacting?
Yes. The rendering and redaction happen entirely in your browser, so your unredacted document never travels over the network.
Related PDF tools
Unlock PDF
Remove PDF password protection to unlock your PDF files.
Protect PDF
Add password protection to your PDF files.
Sign PDF
Add your signature to PDF documents easily.
Compare PDF
Compare two PDFs for structural differences in page count, dimensions, and rotation.
Related guides from the PdfPix blog
Step-by-step articles that show how to get the most out of Redact PDF Document in real workflows.