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Redact PDF Online Free – Permanently Black Out Sensitive Content

Permanently black out text, images, and personal data from any PDF. Redacted content is fully removed - not just hidden - and cannot be recovered. Free, no signup.

Select a PDF to redact

Drag & drop your PDF here, or click to browse

PDF files only · Up to 100 MB

How it works

Redact a PDF in 3 simple steps

No software to install. Works on any device with a modern browser.

01

Upload your PDF

Click "Select PDF file" or drag and drop. SupaPDF renders every page for interactive editing immediately.

02

Draw redaction boxes

Navigate to each page using the page strip. Click and drag on the preview to draw black boxes over sensitive content - names, account numbers, addresses, or any private information. Hover a box and click × to remove it.

03

Download the redacted PDF

Click "Redact PDF". The content under each box is permanently destroyed - not just hidden. The result is a clean, tamper-proof PDF safe to share.

Why SupaPDF

Everything you need to redact PDFs

Trusted by legal, compliance, and security teams worldwide.

Permanent, not hidden

Redactions are applied at the PDF structure level using PyMuPDF. The underlying text, images, and metadata are destroyed - not overlaid with a black rectangle that can be copy-pasted around.

Private & secure

All uploads use encrypted HTTPS. Files are permanently deleted from our servers immediately after your download is complete. Nothing is retained or logged.

Multi-page support

Redact content across any number of pages in a single job. The page strip shows which pages have redactions, and each page's boxes are managed independently.

Full developer API

Pass an array of {page, x, y, width, height} areas in PDF points. Optionally include an overlay_text label (e.g. "REDACTED") with custom font and color.

Developer API

Redact PDFs programmatically

Pass an array of area objects. Each area specifies a page (1-indexed) and a bounding box in PDF points. y=0 is the top of the page.

curl -X POST https://api.supapdf.com/v1/jobs \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "tag": "redact-pdf-job",
    "tasks": {
      "upload-1": { "operation": "import/upload" },
      "redact-0": {
        "operation": "redact_pdf",
        "input": ["upload-1"],
        "color": "#000000",
        "overlay_text": "REDACTED",
        "font_size": 12,
        "font_color": "#ffffff",
        "areas": [
          { "page": 1, "x": 72,  "y": 144, "width": 288, "height": 24 },
          { "page": 2, "x": 144, "y": 288, "width": 216, "height": 18 }
        ]
      },
      "export-result": { "operation": "export/url", "input": ["redact-0"] }
    }
  }'

Coordinates are in PDF points (1 inch = 72 pt). A standard A4 page is 595 × 842 pt; US Letter is 612 × 792 pt. y = 0 is the top of the page. overlay_text, font_size, and font_color are all optional.

FAQ

Frequently asked questions

Everything you need to know about redacting PDFs with SupaPDF.

Ready to secure your document?

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