To redact a document by hand, cover each piece of sensitive text with a dense redaction marker or opaque tape, check the back of the page and hold it to a bright light to confirm nothing shows through, then photocopy the marked page and share only the copy. The original still has recoverable information under the ink; the flattened photocopy does not. Most failures happen at verification, not application, so the copy step is where secure redaction actually gets finished.
Gather the Right Materials
Marker choice matters more than people expect. A standard Sharpie will technically cover text, but dedicated redaction markers use thick, paint-like ink that fully blocks light in a single pass. Regular permanent markers often need multiple coats and can still show faint text against a bright light. A chisel tip is what you want: the wide flat edge covers a line of text in one stroke, and the corner gives you control at the edges. Fine-tip markers are a poor choice because the narrow passes leave gaps where letters peek through.
Beyond the marker, keep a few things within reach:
- Opaque adhesive tape, for larger blocks and for thin paper where ink might bleed
- A photocopier or scanner, which is not optional
- A piece of cardboard or a clipboard to place under the page
- A cross-cut shredder for the original and any scraps
If you only have a broad-tip permanent marker, it will work, but plan on two heavy coats and careful verification.
Prepare the Page
Before you uncap anything, read the whole document and mark every location where sensitive information appears. Use a pencil in the margin. This prevents the classic mistake of catching the obvious account number on page one and missing the same number buried in a paragraph on page four. If the document is double-sided, review both sides of every page.
Separate the page from anything underneath it and put a rigid surface below. Heavy marker strokes transfer pressure impressions to lower pages, and those impressions can be read by angling the paper under light. It feels paranoid until it matters.
Apply the Redaction
Draw firmly over the target text with slow, deliberate strokes. Cover the full area so no character outlines remain, including ascenders and descenders that poke above and below the main body of the letters. For dense text, let the first coat dry and apply a second. A single thin pass often looks solid at your desk and then fails under a lamp.
Opaque tape works well for entire lines or blocks. Press it down firmly with no air bubbles or lifted edges, and confirm the tape itself is truly opaque; some correction tapes are slightly translucent.
For extremely sensitive content, you can cut the section out entirely with scissors or a craft knife. Shred the removed piece immediately. You can patch the hole with opaque paper and tape if you need to preserve the page structure, though the patch obviously signals that something was removed.
Check the Back of the Page
This is where hand redactions quietly fail. Flip the page over. Marker ink can bleed through thinner paper and create a legible mirror image of the redacted text. Even without full bleed, the wet marker often leaves enough of an impression to be readable from behind. If you see anything, apply marker to the back or cover it with opaque tape.
Verify Before You Share Anything
Hold the page up to a bright light: a sunny window works, a strong desk lamp works. Look for faint outlines, shadows, or color differences inside the redacted area. Even partial letter shapes can be enough to reconstruct a name or an account number. Check both sides.
Then photocopy or scan the page. This is the single most important step in the process, and it does two jobs at once. It exposes problems: some inks and tapes look opaque to the eye but behave differently under the bright light of a copier, and covered text can reappear in the copy. It also produces your distribution copy. A photocopy of a properly redacted page is far more secure than the original, because it flattens everything into a single layer. Nothing to scrape off, nothing to peel back, no impression to feel. Distribute the copy. Never distribute the marked-up original.
If you are scanning to a digital file, zoom to 200% on each redacted area and push the brightness and contrast. Text that is invisible at normal size sometimes becomes legible at high zoom with the contrast cranked up. If anything surfaces, add another layer to the physical page and scan again.
What to Redact in Court Filings
Federal court filings have specific rules. Under the Federal Rules of Civil Procedure, anyone filing a document must limit Social Security numbers and taxpayer identification numbers to the last four digits, show only the birth year rather than the full date, use only initials for a minor’s name, and reduce financial account numbers to the last four digits.1Legal Information Institute. Federal Rules of Civil Procedure Rule 5.2 – Privacy Protection For Filings Made with the Court Criminal filings add one more: home addresses must be reduced to city and state only.2Legal Information Institute. Federal Rules of Criminal Procedure Rule 49.1 – Privacy Protection For Filings Made with the Court
The responsibility falls on the person filing, not the court clerk.2Legal Information Institute. Federal Rules of Criminal Procedure Rule 49.1 – Privacy Protection For Filings Made with the Court File a document with a full Social Security number visible and you have waived that protection; the number becomes part of the public record.
Local courts have their own conventions on how to mark the redaction. Some expect a “REDACTED” notation where information was removed; others just want the partial identifiers above. The clerk’s office can tell you what format they expect.
Labeling FOIA Redactions
Redacting for a Freedom of Information Act response is different from redacting for privacy. Federal law requires agencies to indicate both the amount of information deleted and the specific exemption justifying each deletion, marked at the location in the record where the deletion was made whenever technically feasible.3Office of the Law Revision Counsel. United States Code Title 5 Section 552 In practice, that means writing the exemption number (for example, “Exemption 6” for personal privacy) in the margin next to each redacted area, or stamping it on the blacked-out section itself.
Store the Original, Then Destroy It
Once you have your clean copy, the marked-up original becomes the most sensitive version of the document. Recoverable text often still sits under the ink. If you need to keep it, store it with the same protections you would give the unredacted version: a locked cabinet or equivalent.
When you no longer need the original, shred it. A cross-cut shredder rated at security level P-4 under the DIN 66399 standard reduces paper to particles no larger than 160 square millimeters, small enough to make reconstruction impractical. Strip-cut shredders produce long ribbons that a determined person can reassemble, so they are not the right choice for anything sensitive.
If you cut sections out during redaction, shred those pieces along with the document. Do not drop scraps in the trash, however small. A Social Security number fits on a piece of paper the size of a postage stamp.