How to redact a PDF without uploading it

To redact a document with a cloud tool, you first have to upload it — and the version you upload is the unredacted one, the most sensitive copy that exists. For a privileged client file, a personnel record, or anything under an NDA, that upload is exactly what you are trying to avoid.

For lawyers this also intersects with professional duties. ABA Model Rule 1.6(c) requires a lawyer to make reasonable efforts to prevent unauthorized access to client information, and the duty of competence (Rule 1.1, Comment 8) expects lawyers to understand the risks of the technology they use. The simplest way to satisfy that bar is not to put the document on someone else's server in the first place.

The most common redaction mistake is visual-only: the tool draws a black rectangle over the text but leaves the original characters in the file underneath. Anyone can select, copy, or extract that text — the “redaction” is cosmetic. This has caused real, embarrassing leaks of court filings and contracts.

DukPdf's Redact tool does the second kind: each redacted page is re-rendered as an image with the content burned out, and the original text is removed from the file — not merely covered.

1. Open the Redact PDF tool. It loads in your browser — nothing is uploaded.
2. Drag in your PDF (or click to choose it). The file is read on your device.
3. Draw a box over each piece of text or area you want removed; add as many as you need across any page.
4. Apply and download. The redacted pages are flattened to images with the original content permanently removed.

Because the whole process runs locally, you can confirm there is no upload in the browser's Network tab. See the private PDF editor page for how local processing works across every tool.