Frequently Asked Questions

No. You can remove the background from a stamp or signature without registration — just upload the image. Registration is required to access API keys and to open your processed files from other devices.

Processing and previewing are available for free. To download a PNG, you need 1 processing credit from a package on the pricing page.

In the web interface — PNG with a transparent background. Via the API, you can get JSON with a link, PNG, or WebP.

Maximum 20 MB.

A mode in which SigCleaner saves only one object — either a stamp/seal or a handwritten signature. Enable it if the image contains both elements, but you only need one. Instructions: extract stamp, extract signature.

If there is a lot of printed text, numbers, or form lines around the stamp or signature. This mode more aggressively removes printed characters and straight black lines. Read more: aggressive text removal.

The most common issues are: a pale or smudged impression, shooting at an angle, dark paper, shadows, and a frame that is too wide covering the entire document. Take a clearer photo, crop only the impression, and enable aggressive mode if necessary. See photo tips.

Uploaded files are used for processing and are not published. Files can be deleted in the "My files" section.

Yes. Download the PNG and insert it as an image. Instructions: stamp in Word / Excel, signature in PDF.

If you are registered, you can delete your account on the account deletion page. All processed files, documents, API keys, and sessions will be permanently deleted. A one-time code will be sent to your email for confirmation.