FyleTools — 無料オンライン画像・PDF編集ツール

How to Redact a PDF

Upload your PDF

Drag and drop your PDF file or click to select it. Your file stays in your browser — nothing is uploaded.

Draw redaction areas

Navigate through pages and click and drag to draw black boxes over sensitive text, images, or information you want to permanently hide.

Download the redacted PDF

Click "Apply Redactions" and download. The redacted areas are permanently blacked out — the original content is irreversibly removed.

Why use FyleTools to redact PDFs?

100% Private

All redaction happens in your browser using WebAssembly. Your sensitive documents never leave your device — no server, no cloud.

Permanent Redaction

Unlike simple black overlays, our redaction permanently removes the underlying content. The text cannot be recovered or selected.

Visual & Intuitive

See your PDF pages as thumbnails, draw redaction boxes visually, and preview exactly what will be censored before applying.

Frequently Asked Questions

Is the redacted content permanently removed?

Yes. The redaction burns black boxes into the PDF content stream. The original text or images beneath are permanently destroyed and cannot be recovered.

Is my document uploaded to a server?

No. Everything happens locally in your browser using WebAssembly technology. Your sensitive documents never leave your device.

Can I redact specific text automatically?

Currently you draw redaction boxes manually over areas you want to censor. This gives you full visual control over exactly what gets redacted.

Does redaction work on scanned PDFs?

Yes. Since the tool draws opaque black boxes over the areas you select, it works on any PDF regardless of whether the content is text or scanned images.

Can someone undo the redaction?

No. Once applied, the content beneath the redaction boxes is permanently removed from the PDF. There is no way to recover the original content.

Can the redacted content be recovered by anyone?

No. Unlike simple black overlays, FyleTools permanently removes the content beneath redaction boxes from the PDF data. The original text and images are destroyed and cannot be recovered.

Does redaction work on images and photos in the PDF?

Yes. The redaction boxes cover any content — text, images, or graphics. The black rectangles are burned into the page, permanently hiding whatever is underneath.

Can I redact text automatically by keyword?

Currently you draw redaction boxes manually, which gives you precise visual control. Automatic keyword-based redaction is not yet available.

Is this tool suitable for GDPR or HIPAA compliance?

The tool permanently removes content from the PDF, which supports compliance efforts. However, consult your compliance officer to ensure your full redaction workflow meets regulatory requirements.

When to Use This Tool

Black out social security numbers or personal IDs before sharing documents

Redact confidential salary or financial information from reports

Remove sensitive patient information from medical records for compliance

Censor proprietary data in legal documents before public filing

Supported Formats

Format	Description	Best For
Any PDF	Text-based or scanned PDFs	Permanently hiding sensitive content
Visual redaction	Click and drag black boxes	Precise control over what gets censored
Permanent removal	Content is destroyed, not just hidden	Legal compliance and privacy requirements

Tips & Best Practices

Zoom in to precisely draw redaction boxes over the exact content you want to hide

Redaction is permanent — always keep a copy of the original unredacted document

Use the undo button to remove a redaction box before applying if you make a mistake

Check every page carefully before applying — once applied, redacted content cannot be recovered

How It Works — 100% Private Processing

FyleTools redacts your PDF entirely in your browser using WebAssembly and the lopdf library compiled from Rust. The redaction burns opaque black rectangles into the PDF content stream, permanently destroying the underlying text and images. Your document never leaves your device — essential when handling documents with personal data, trade secrets, or classified information.