An image redactor that lets you draw blur, pixelate, black-box or white-box regions straight onto a photo or screenshot and export a clean, flattened image. It’s built for the everyday moment when you need to share a screenshot, a scan of an ID, a receipt or a bank statement but have to hide a name, an address, a card number, a face or an email first — without trusting an upload to some unknown server.
Everything happens in your browser. The file is read locally, drawn onto an HTML canvas, edited with your boxes, and re-encoded as a new PNG or JPG. No bytes leave your device, which is exactly what you want when the whole point is privacy.
How it works
When you load an image it is decoded into a canvas sized to its natural pixel dimensions. As you click and drag, the tool records each rectangle in those natural coordinates — so even though the preview is scaled to fit your screen, the redaction lands on the exact right pixels at full resolution.
Each box is rendered using one of four operations. Black and white boxes simply fill the region with a solid colour, which destroys all underlying detail and is the safest choice. Blur copies the region into an offscreen canvas, runs a multi-pass gaussian blur with a padded border so edges sample correctly, then clips the blurred result back into place. Pixelate shrinks the region down to a handful of blocks and scales it back up with image smoothing turned off, giving the classic mosaic look.
Crucially, all of this is drawn onto the same canvas that gets exported. There is no hidden original layer underneath — when you download, the pixels you redacted are gone for good. As a bonus, re-encoding from the canvas strips EXIF metadata (GPS, camera model, timestamps) from the output.
Example
Say you photographed a printed invoice to send to a colleague, but it shows your home address and a partial card number. Load the photo, choose Black box, and drag a rectangle over the address block and another over the card digits. Switch to Pixelate with a block size of 20px and cover the signature so it’s recognisable as a signature but not forgeable. Then click Download PNG.
| Redaction style | Best for | Reversible? |
|---|---|---|
| Black box | Card numbers, passwords, IDs | No — fully destroyed |
| White box | Text on light backgrounds | No — fully destroyed |
| Blur (high) | Faces, backgrounds | Hard at high radius |
| Pixelate | Signatures, logos | Hard at large blocks |
The exported file matches the original resolution, contains no recoverable original data under the boxes, and never touched a server.