Stamp Background Remover

Upload a photo or scan of a stamp, seal, chop, or signature — get a clean transparent PNG back in seconds. 100% On-Device Nothing is uploaded. All processing runs in your browser.

🖼️

Drop your image here
or click to browse — JPG, PNG, WebP

Boost ink contrast (recommended for light stamps)

Remove edge halos (desaturate fringe pixels)

Threshold: 20 (higher = more pixels removed)

Original

Transparent PNG

How it works

The tool runs entirely inside your browser using the HTML5 Canvas API — no external library, no server. Your image never leaves your device.

Step 1 — Load image Drop or select a JPG, PNG, or WebP scan of your stamp, seal, or signature.

Step 2 — Background sampling The tool samples the average colour from the four corners of the image to detect the background colour (works for white, off-white, cream, or light-coloured backgrounds).

Step 3 — Alpha mask + post-processing Each pixel's distance from the background colour is computed; close matches become transparent. Optional contrast boost and halo removal then clean up the edges.

Step 4 — Transparent PNG export The result is encoded as a lossless PNG with a full alpha channel, ready for Word, Photoshop, Canva, or web use.

Best results: use a flat, evenly-lit scan or photo against a plain white or light background. Shadows and creases may require the threshold or contrast boost adjustments above.

Frequently asked questions

Will my stamp image be uploaded to a server?: No. This tool runs 100% inside your browser using WebAssembly. Your image never leaves your device. There is no backend, no account, and no data retention. This is especially important for company stamps, official seals, and signatures that contain sensitive identity information.
What types of stamps work best?: The tool works well for rubber stamps, ink seals (red or blue), company chops, notary seals, wax stamp scans, and handwritten signatures on white or light paper. It also handles embossed-looking marks and watercolor stamps. Very light or faded impressions may benefit from increasing the Threshold slider or enabling "Boost ink contrast."
Why does my result still have a white fringe or halo?: Halos appear when the original background bleeds into the ink edge at the pixel level. Try enabling the "Remove edge halos" option, which desaturates and lightens fringe pixels, and increase the Threshold value. For very stubborn halos on scanned documents, scanning at 300 dpi or higher before uploading gives the model more detail to separate cleanly.
Can I paste the transparent PNG into Microsoft Word or PowerPoint?: Yes. Download the PNG, then in Word go to Insert → Pictures → This Device, select the file. The transparent areas will show through, so the stamp appears floating on your document background. In PowerPoint the same workflow applies. Google Docs and Slides also support transparent PNGs.
What file formats are supported as input?: JPG (JPEG), PNG, and WebP. TIFF and PDF scans must be converted to one of these formats first — most scanners export JPEG by default. The output is always a lossless PNG with transparency regardless of the input format.
Does this work on mobile (iPhone / Android)?: Yes. You can photograph a stamp with your phone camera and open it here on any modern mobile browser. The WebAssembly model is supported on Chrome, Safari (iOS 16+), Firefox, and Edge. Processing may take 5–15 seconds on older phones as the model is computationally intensive.