# Why black boxes are not redaction

> Why drawing a black box on a PDF is not real redaction, and how to permanently remove text without uploading.

Canonical: https://mypdf.space/guides/why-black-boxes-are-not-redaction
Last updated: 2026-10-22

## Direct answer

A black rectangle often sits on top of live text. Use Redact or Auto-redact on mypdf so pages rebuild as images and the text is destroyed — then verify with the privacy checker.

## Introduction

Fake redaction is one of the most common PDF leaks. If you can still highlight “blacked out” words, the file is not safe to share.

## Steps

1. Open the privacy checker and look for text under black boxes.
2. Re-redact with Redact or Auto-redact PII.
3. Download and try selecting the area again.
4. Re-run the checker on the output.

## How real redaction works here

Matched pages are rasterized so pixels replace the old text layer. See Security methodology for limits.

## Limits

- Always human-review after automated redaction.
- Metadata and attachments need Deep Clean separately.

## FAQ

### How do I test fake redaction?

Select through the black bar or search for the hidden word.

### Does mypdf upload?

No.

### Verify guide?

See Verify PDF redaction worked.

## Related

- [Redact](https://mypdf.space/tools/redact)
- [Auto-redact PII](https://mypdf.space/tools/auto-redact-pii)
- [Hidden Content Auditor](https://mypdf.space/tools/pdf-audit)
- [All guides](https://mypdf.space/guides)