DocuFix Studio

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Open a PDF or load the sample to start editing.

Redact a PDF – black out sensitive information

Drag a box over anything you need to hide. Export with Flatten pages so nothing remains underneath, and your document is processed in your browser only.

Private by design: your PDF is processed in your browser and never uploaded.

Watermark removalDetect the watermark colour, then clear it from one page or every page while dark text stays untouched.
Edit text in placeTap a line, retype it, and the font, size, colour and angle are matched for you.
Logo and signatureDraw a box to add or replace a logo, and sign with a drawn or typed signature.
Redact and mark upBlack out sensitive details, highlight, draw boxes, ovals and lines, or write freehand.

How to redact a PDF properly

  1. Choose your PDF, then open the Redact tool and pick black or white.
  2. Drag a box over every name, number or address you want to hide.
  3. Press Export PDF and choose Flatten pages to images.
  4. Download the file. Text underneath the boxes no longer exists in it.

One free toolkit for everyday PDF jobs

Remove watermarkDetect and remove grey or coloured watermarks from one page or the whole document.Edit PDF textReplace a line of text and keep the original look, or add new text anywhere.Add or replace logoDraw a box to add a logo, or replace an old one at the same size.Sign PDFDraw or type a signature and place it on any page.Redact PDFBlack out sensitive details and flatten the pages so they cannot be recovered.Merge and organize pagesRotate, delete and reorder pages, or merge in pages from another PDF.

Frequently asked questions

Is a black box on a PDF enough to hide the text?

No. In a normal export the original text can still exist underneath the box and be copied. Choose Flatten pages when you export, which turns each page into a picture so the hidden text is truly gone.

Can I still select text after redacting?

After flattening, text is no longer selectable because every page is an image. That is the price of a secure redaction.

Does redaction leave my device?

No. Everything is done in your browser, and the file is not uploaded.

Is DocuFix Studio really free?

Yes. It is free to use, with no sign-up, no watermark added by us and no page limit.

Is my PDF uploaded to a server?

No. Your PDF is opened and edited inside your own browser and is not uploaded anywhere, so confidential documents stay on your device. Only the editing libraries and fonts are downloaded when you first open the page.

Does it work on a phone or tablet?

Yes. The editor is designed for touch screens as well as desktop: pinch to zoom, drag to draw, and install it as an app from your browser menu. It also supports a light and a dark theme.

Can it remove every kind of watermark?

Not always. It works best on watermarks drawn in a consistent colour, such as grey or coloured diagonal text and stamps on a plain background. Watermarks that are part of a photo, or that share the colour of your text, may leave traces and need the Area Patch or Brush tool. Only remove watermarks from documents you own or have permission to edit.