About SigCleaner

SigCleaner is a free online tool for removing backgrounds from photos of stamps, seals, and handwritten signatures. Make your images transparent in seconds — no registration or software installation required.

Why use SigCleaner

Every day, thousands of accountants, clerks, lawyers, and HR professionals face the same challenge: they need to insert a stamp or signature into an electronic document, but the photo has a white background, "L.S." marks, and form lines. Manually removing the background in Photoshop is time-consuming and requires special skills.

SigCleaner solves this problem automatically. Upload a scan or photo, and the service will remove the background from the stamp, erase unwanted text and artifacts, and return a clean PNG with a transparent background, ready to be inserted into any document.

Benefits

Completely free No subscriptions, no watermarks, no hidden terms.
Fast — in seconds Remove the background from a stamp faster than opening a photo editor.
Specialized for stamps Not a generic editor, but a purpose-built solution for this specific task.
Removes "L.S." marks and lines The AI understands context and cleans up form elements around the stamp.
Works on mobile Take a photo of a stamp directly in your browser — no app required.
Developer API REST API with Bearer token authentication for seamless integration into any system.

Who is it for

  • Accountants who need to insert a stamp into an invoice or statement
  • Law firms and notaries — for PDF documents and contracts
  • HR professionals — for orders, employment contracts, and performance reviews
  • Document management systems (DMS) and document signing services
  • Developers — via REST API for batch processing

API

SigCleaner provides a simple REST API with Bearer token authentication. This allows you to integrate background removal into your own systems — CRMs, DMS, document signing services, and any other applications. After registering, you will receive a free API key in your dashboard. Detailed documentation — on the page API.

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