Como redigir um PDF no Preview (Mac)

Two different tools in Preview (do not confuse them)

How to use Preview Redact on Sonoma / Sequoia

1. Open PDF in Preview.
2. Choose Tools → Redact (tool stays active until you turn it off).
3. Select text with the text cursor, or drag a box over image regions.
4. Use File → Save As to create redacted-copy.pdf—preserve an unredacted original.
5. Turn off Tools → Redact when finished so you do not accidentally mark more content.
6. Run verification below before emailing.

Apple documents that redactions are permanent once saved—you cannot undo from that file. Sequoia users on Apple Community report redaction boxes disappearing on save when the PDF author restricted modifications, when they used shapes instead of Redact mode, or when saving to read-only locations. Test markup on a throwaway PDF: if ordinary annotations also fail to save, fix permissions or export location first.

Known Preview limitations (even with Redact)

• Invisible or off-page text may survive—Acrobat Sanitize catches some cases Preview does not.
• No built-in metadata scrub (Author, Creator from export chain).
• Scanned PDFs: Redact may not align with OCR offset; verify visually on faxes and exhibits.
• Independent tests found partial letter fragments recoverable in edge cases.
• No batch folder processing or SSN pattern auto-detection—manual marking only.

The verification ritual (mandatory)

Also open the file in Chrome or Adobe Reader and repeat. If Preview-specific caching masked a problem, a second viewer catches it.

When to leave Preview for offline redaction

Use offline desktop redaction instead of Preview when: multi-page bank statements with footers, CM/ECF court filings, discovery productions, payroll PDFs, or any file where failure means identity theft or sanctions. Preview is acceptable for low-risk personal tasks after verification—not as firm policy for regulated data.

Legacy workaround on older Macs (Apple Stack Exchange): export pages as PNG → reassemble as PDF, or Print → Save as PDF after image export. Confirm no selectable text remains. Slow but safer than shapes on Monterey.

Fluxo passo a passo

1. Check macOS version: About This Mac → Sonoma 14+ for Redact tool.
2. Save a copy of the original PDF before editing.
3. Enable Tools → Redact—not Annotate shapes.
4. Mark all sensitive regions; check footers and exhibit pages.
5. File → Save As → new filename.
6. Cmd+A paste test + Find search for redacted strings.
7. Open in second viewer; repeat tests.
8. For financial/legal/court files: consider offline redactor with auto-detection instead.

Erros comuns

• Using black rectangle shapes

  Reversible annotations. Numbers copy out in Notepad—the myFICO forum failure mode.

• Trusting Save without Save As

  You may overwrite your only unredacted copy. Always preserve originals separately.

• Assuming Redact fixed metadata

  Author email in document properties may still identify you. Scrub in a second pass if needed.

• Redacting once on page 1 of a statement

  Account numbers repeat in footers. Search the entire PDF or use auto-detection.

Verificação antes de partilhar

• ✓Cmd+A → Copy → Paste: zero sensitive strings.
• ✓Find search for last-four account or SSN digits: no hits.
• ✓Second viewer (Chrome/Reader) confirms same behavior.
• ✓Redactions persist after closing and reopening file.
• ✓Original unredacted copy archived separately.

FAQ