Document Redactor

Document Redactor is a browser-based tool for covering, blurring, or pixelating specific areas of a document before sharing it. Upload a JPG, PNG, WebP, or PDF, draw protection areas over any content you want to hide, add an optional watermark, and export a flattened copy with all edits permanently embedded. The tool processes files locally and does not upload them to any server.

How to use

1. Upload your document. Drag a JPG, PNG, WebP, or PDF (up to 100 MB) onto the upload area or click to browse.
2. Draw protection areas. Use the four tools to cover any part of the document: Redact places a solid black box; Blur applies a Gaussian blur; Pixelate replaces the area with a pixel grid; Highlight adds a yellow overlay to mark content you are deliberately leaving visible. Click and drag to draw. Click an annotation to select and delete it.
3. Add a watermark (optional). Enable the watermark to stamp a label onto the document. Type any text or use a preset. Adjust position, style, and opacity.
4. Export. Download the edited document as a PDF, PNG, or JPG. All protection areas are permanently flattened into the exported file. There are no layers and the effects cannot be reversed.

Protection methods

• Redact. Covers the selected area with a solid black fill. The underlying content is completely replaced in the exported file. There is no way to recover it from the exported image or PDF.
• Blur. Applies a Gaussian blur over the selected region. The content is obscured but the blurred area remains visually soft. Use the strength slider to control blur intensity.
• Pixelate. Replaces the selected region with a pixel grid. Visually distinctive and makes it clear that content was intentionally covered. Use the pixel size slider to adjust.
• Highlight. Applies a semi-transparent yellow overlay. Use this to mark areas you are deliberately keeping visible, not to cover content.

Why use PixMidas

• Locally processed. Document Redactor is designed to process files on your device. Your document content is not uploaded to any server.
• Permanently flattened exports. The exported file is a flat image with all edits burned in. There are no layers, no metadata, and no way to reverse the applied effects.
• No account needed. Open the tool and start immediately.

Frequently asked questions

Is my document uploaded to a server?

Document Redactor is designed to process files locally using the Canvas API and PDF.js. Your file is read into your browser's memory and is not transmitted to any server. PDF.js and export libraries are loaded from a third-party CDN on first use. Only the library code is fetched, not your document.

Can the redactions be reversed in the exported file?

No. The export renders the document as a flat image: a PNG, JPG, or image-based PDF. All protection areas are permanently part of the pixel data. There are no layers and the underlying content cannot be recovered from the exported file.

What is the difference between the protection methods?

Redact replaces an area with a solid black fill, the most complete way to remove content. Blur softens the area using a Gaussian blur. The content is obscured but the blurred region is still visible. Pixelate replaces the area with a large pixel grid, visually distinct and makes clear that content was intentionally covered. All three permanently hide the underlying content in the exported file.

Which file types are supported?

Input: JPG, JPEG, PNG, WebP, and PDF (up to 100 MB). Output: PDF (recommended for multi-page documents), PNG (lossless), or JPG (smaller file size). Exported PDFs are image-based. They are not searchable or editable text PDFs.

Can I use this on a multi-page PDF?

Document Redactor currently supports single-page documents. For multi-page PDFs, each page can be processed individually. Multi-page support is planned for a future update.

Does this work on mobile?

Yes. Touch events are supported for all drawing tools. On small screens, use the zoom controls to enlarge specific areas before drawing to improve annotation precision.

What does the Highlight tool do?

Highlight applies a semi-transparent yellow overlay to the selected area. Use it to visually mark content you are deliberately keeping visible, for example to make clear to yourself or a reviewer that a specific field was intentionally left uncovered.