Honest comparison
clean.ink vs macOS Preview for redacting PDFs
Preview can truly redact — if you use the right tool in it. Since macOS Big Sur, Preview’s Markup toolbar includes a dedicated Redact tool that permanently removes content. Right next to it sits the shape tool, which draws an identical-looking black box that removes nothing. clean.ink’s difference isn’t privacy — both are local — it’s that clean.ink finds the sensitive fields for you, every box destroys content by design, and it runs on any OS.
Last updated July 9, 2026
Side by side
| clean.ink | macOS Preview | |
|---|---|---|
| True redaction (content destroyed) | Yes — covered content is removed from the exported file | Yes — with the Redact tool (macOS 11+); shapes only cover |
| Document stays on your device | Always — all processing is in-browser | Always — Preview is a local app |
| Finds the sensitive fields for you | Yes — auto-detects SSNs, accounts, salaries, addresses, and more | No — you locate every instance yourself |
| Guards against the cover-only mistake | Every box destroys content — there is no cover-only tool | Redact and shape tools sit side by side and look identical |
| Works on | Any modern browser — macOS, Windows, Linux, mobile | Mac only |
| Scanned documents | On-device OCR recovers text, then detection runs | No OCR — a scan is just an image to Preview |
| Price | Free preview · $6.59 once for clean downloads | Free, preinstalled on every Mac |
Preview capabilities as documented by Apple for macOS 11 and later; behavior can differ on older versions.
The one Preview mistake that leaks documents
Open a PDF in Preview, draw a black rectangle over your SSN with the shape tool, save, send. The document looks redacted. It isn’t: the rectangle is an annotation sitting on top of intact text, and anyone can select through it, copy, and paste your SSN out — or just delete the shape. Preview’s real Redact tool warns you that content will be permanently removed; the shape tool says nothing, because it isn’t removing anything.
If you use Preview, use Tools → Redact and then verify the saved file: select-all, copy, paste into a text editor, and search for what you removed. The full test is in Can redacted PDFs be un-redacted?
Auto-detection · every box destroys content · any OS
Questions
- Can macOS Preview really redact a PDF?
- Yes — on macOS Big Sur (11) and later, Preview's Markup toolbar includes a dedicated Redact tool that permanently removes the content when you save. The danger is that Preview's rectangle/shape tool produces an identical-looking black box that only covers the text, leaving it selectable in the file. Real redactions and fake ones look the same on screen.
- When is Preview the better choice?
- When you're on a Mac, the document has only a couple of spots to remove, and you know exactly where they are. Preview is free, already installed, and fully local. Just make sure you use the Redact tool — not a drawn rectangle — and verify the saved file.
- When is clean.ink the better choice?
- When you don't want to hunt for the sensitive fields yourself. clean.ink auto-detects SSNs, account and routing numbers, salary amounts, addresses, and dozens of other identifiers, and walks you through each in a review queue — on any operating system, in the browser, with the document never uploaded. It's $6.59 once for clean downloads; previewing is free.
- Is Preview private? Does it upload my document?
- Preview is a local application — your document stays on your Mac, which is genuinely private. clean.ink matches that (all processing is in-browser, no upload) while adding automatic detection and a verifiable preview, and working on Windows, Linux, and mobile too.