Tools
Stamp image tools
Clean uploads, extract ink by colour, crop, resize, rotate, or add a background — entirely in your browser. Turn a phone photo or scanner export into a transparent PNG ready for Stamp PDF and documents.
Clean uploaded stamp
Remove white backgrounds and recolor ink for a transparent seal PNG.
Extract stamp by colour
Keep ink close to a chosen colour and clear the rest.
Crop stamp
Upload a seal photo, drag a round, square, or rectangle frame over it, and download the crop.
Resize stamp
Scale a stamp image to exact pixel sizes.
Rotate stamp
Rotate with optional canvas expansion.
Add background
Place a solid background behind a transparent stamp.
Stamp tools FAQ
What are Stamp Maker image tools used for?
They clean, extract, crop, resize, rotate or add a background to a scanned or photographed seal so you get a transparent PNG ready for Stamp PDF or documents.
Should I use Clean or Extract on a stamp scan?
Use Clean when the seal sits on plain white paper. Use Extract when ink sits on printed text or a coloured form and you need to keep only pixels near a chosen ink colour.
Do stamp image tools upload my photo?
Processing is designed to run in your browser for the primary download path. See the Privacy page for contact forms and analytics.
Can I crop a round company seal from a photo?
Yes. Open Crop stamp, choose Round, drag the frame over the seal, resize with the corner handle, then download a tight transparent PNG.
Are stamp tools free with no watermark?
Yes. All six tools are free, need no account, and export PNGs without Nelstack branding on the image.