Trexo PDF Signer icon
Trexo PDF Signer icon

Trexo PDF Signer

Free, open-source desktop app for legally binding PDF digital signatures. Sign with PKCS#11 hardware tokens, USB dongles, smart cards, PFX certificates, or Windows keystore. Adobe-compatible, RFC 3161 timestamped, fully offline — no cloud, no subscription.

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Platforms

  • Windows
  • Linux
  • Mac
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  •  8 Stars
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  •  1 Open Issues
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Trexo PDF Signer was added to AlternativeTo by Pintu Prajapati on and this page was last updated .
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What is Trexo PDF Signer?

Trexo PDF Signer is a free, open-source desktop application for creating legally binding digital signatures on PDF documents. Unlike subscription-based services, it runs entirely on your machine — no cloud uploads, no monthly fees, no data leaving your hands.

It is built for professionals and enterprises that require real cryptographic signing using X.509 certificates, hardware security tokens (USB dongles), smart cards, or standard PFX/P12 certificate files. Signatures produced by Trexo PDF Signer are fully compatible with Adobe Acrobat Reader and meet legal compliance standards in most jurisdictions.

Key features: — Sign PDFs with PKCS#11 hardware tokens (SafeNet eToken, Gemalto, ProxKey, Feitian, mToken, Watchdata, and more) — Sign with PKCS#12 / PFX certificate files — Sign using the Windows Certificate Store — Place visual signatures anywhere on the page with drag-and-drop — Add multiple signatures to a single document — RFC 3161 trusted timestamps for long-term signature validity — SHA-256, SHA-384, and SHA-512 hash algorithm support — Full certificate chain validation with OCSP/CRL — Customizable signature appearance (text, logo, image) — Verify existing signatures inside the application — Works on Windows, Linux, and macOS — No internet connection required for signing — 100% open source under AGPL-3.0

Trexo PDF Signer is the ideal free alternative to Adobe Acrobat, DocuSign, and SignNow for users who need hardware token-based signing or simply want a private, offline solution they can trust and inspect.