How to Redact a PDF Without Adobe Acrobat

You do not need Adobe Acrobat to redact a PDF. macOS Preview has a built-in redaction tool, and LibreOffice Draw is open-source software that does the same job on Windows, Mac and Linux. This guide shows which option truly deletes the text, and how to check your work before you send the file.

Why a Black Box Is Not Redaction

Most people redact the wrong way by accident. They open a PDF in an editor, draw a black rectangle over a name or a number, then save the file. The rectangle sits on top of the page like a sticker. The text underneath is untouched.

A PDF stores text as real characters, not as a picture. A shape drawn on top is a separate object, one layer above the words. Anyone can move that shape, delete it, or just copy the text straight through it with a keyboard shortcut.

How to Redact a PDF With macOS Preview

Preview has a built-in redaction tool. According to Apple's own support page, the Redaction tool removes the marked text from view, and the change becomes permanent once you close and save the file. Always work on a copy, never the original.

1. 1Duplicate the PDF first, so you always keep an untouched original.
2. 2Open the copy in Preview, then choose Tools and Redact (or click Markup, then the Redact icon).
3. 3Drag over each name, number or line you want to remove. A black bar with a crossed pattern appears.
4. 4Repeat for every page, including headers, footers and any table of contents entry that repeats the text.
5. 5Save the file and close it. Preview warns you the change is permanent, and it is.

Preview's redaction has real limits. It does not touch hidden metadata, such as the author's name in the file properties. If the PDF has a table of contents, Apple's guide notes that entries linking to redacted text are not removed either. Check both by hand afterward.

How to Redact a PDF With LibreOffice Draw

LibreOffice is open-source office software for Windows, Mac and Linux, and its Draw module has a dedicated redaction mode. Unlike Preview, it keeps your original file untouched and only changes a separate exported copy, according to LibreOffice's own help pages.

1. 1Open the PDF, then go to File, Export As, and choose Draw, or open it directly in Draw.
2. 2Pick the Redaction tool from the toolbar. Draw a rectangle, or a free-form shape, over each item to hide.
3. 3For a name or number that repeats many times, use Automatic Redaction instead. Type the exact text, and LibreOffice finds every match.
4. 4Check that the gray shapes cover everything, page by page.
5. 5Choose Redacted Export, Black. LibreOffice turns the shapes into solid pixels and saves a new, flattened PDF.

That last step matters. LibreOffice's help pages say the export replaces the covered content with a block of pixels, so it cannot be restored or copied. Skip that step, and you only have gray shapes sitting on live text. That is no safer than the black-box mistake from before.

Compare Your Options

There is a fifth option: turn the page into a picture. Print it to a new PDF, or export a screenshot after you black out the text. You lose the ability to search the page at all, even the parts that were never sensitive. Save this trick for one stubborn page.

Why Online PDF Converters Are Risky

Online redaction tools look convenient, but weigh the trade-off first. To black out a name on one of these sites, you upload your whole PDF to a server you do not control. The document you are trying to protect leaves your device before anything is removed.

• Does the site say what happens to your file, and for how long it is kept?
• Is the connection encrypted (a padlock and https in the address bar)?
• Would the document embarrass you if that one server were ever breached?
• Could you get the same result with software already on your computer?

ONYRI Sanitize takes a different route. It runs inside your browser, so the PDF never leaves your device. It scans the text for names, ID numbers and IBANs, then lets you check each match before it flattens the file into a new PDF. The catch: you still read the preview yourself, and it does not spot logos, stamps or signatures.

How to Verify Your Redaction Before You Share It

Whichever tool you used, run the same two-minute check before you hit send. It works whether you used Preview, Draw, or anything else. It also takes less time than writing the email you are about to attach the file to.

1. 1Select all the text (Command-A or Control-A) and copy it into a blank document. Nothing sensitive should appear.
2. 2Use Find or Search inside the PDF for the name, number or word you redacted. It should return no results.
3. 3Open the file's properties or info panel and check the author, title and comments fields for leftover details.
4. 4Zoom in on each redacted area. A real redaction is a solid block with no gap at the edges.

None of this makes a document impossible to identify. It only removes what you chose to remove, in the copy you tested. Jane Example, a paralegal preparing an exhibit, still checks page by page before she sends anything to opposing counsel. Treat the two-minute test as part of the job, not an optional extra.