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Skip to contentSign PDFs, add watermarks, redact sensitive fields and verify HMAC locally — no DocuSign subscription.
Signature Studio bundles visual PDF signing with crypto utilities: JWT decode, hash generation, API keys and password tools. Everything runs in one privacy-friendly workspace for contracts, NDAs and internal approvals. Browse related Tentaco tools on this hub, open a studio mode when you need a fuller workspace, and keep files on your device whenever the tool runs locally.
Open Signature Studio → PDF Sign mode
Upload your PDF document
Place signature on the page
Download signed PDF to your device
PDF Sign online — free in your browser
Add a text or image signature to PDF pages. Use Tentaco PDF Sign to process the file in your browser and download the result — no account.
PDF Watermark — draft confidential stamp
Add a diagonal text watermark to all pages. Use Tentaco PDF Watermark to process the file in your browser and download the result — no account.
PDF Redact — black out sensitive text
Black out sensitive regions in a PDF. Use Tentaco PDF Redact to process the file in your browser and download the result — no account.
JWT decoder online — inspect tokens free
Decode and inspect JSON Web Tokens in your browser. Header, payload and signature — no upload.
Privacy depends on the selected tool. Check the privacy block on each tool page for file transfer, processing location and storage.
LocalThis tool processes data locally in your browser. Tentaco does not receive your file contents for this mode.
No — visual signatures for internal use. Use qualified providers for legally binding eIDAS signatures.