Is Trexo PDF Signer really free?

Yes, Trexo PDF Signer is completely free and open-source under the AGPL-3.0 license. You can use it for personal and commercial purposes without any cost. There are no hidden fees, subscriptions, or premium features locked behind a paywall.

What types of certificates does Trexo PDF Signer support?

Trexo PDF Signer supports multiple certificate types: PKCS#12/PFX certificate files (.p12, .pfx), PKCS#11 hardware tokens (USB security tokens like SafeNet and YubiKey, smart cards), and Windows Certificate Store integration for certificates installed in Windows.

Does Trexo PDF Signer require Java?

Yes, Trexo PDF Signer requires exactly Java 8 (version 1.8.x) to run. Higher versions like Java 11, 17, or 21 are NOT supported and will cause errors. You can download Java 8 from Eclipse Temurin (Adoptium) or Oracle. The Windows installer does not include bundled Java, so you must install it separately.

Will my signature show a green tick in Adobe Reader?

Yes, when you sign PDFs with Trexo PDF Signer using a trusted certificate, Adobe Reader will display a green tick checkmark indicating the signature is valid and trusted. This confirms the document has not been modified after signing.

Is Trexo PDF Signer compatible with Adobe Reader?

Yes, PDFs signed with Trexo PDF Signer are fully compatible with Adobe Reader DC, Adobe Acrobat Pro, and other major PDF applications. Digital signatures created by Trexo PDF Signer follow PAdES standards and will be recognized and validated by Adobe products with a green tick checkmark.

How do I download Trexo PDF Signer for Windows?

Visit the Trexo PDF Signer website and click the Download button. For Windows, download trexo-pdf-signer-Setup.exe from GitHub releases. Before running Trexo PDF Signer, install Java 8 from Eclipse Temurin or Oracle. Run the installer and follow the setup wizard to complete installation.

Can I sign PDFs on Linux with Trexo PDF Signer?

Yes, Trexo PDF Signer fully supports Linux. Download the .deb package for Ubuntu/Debian distributions, or use the universal .jar file for any Linux distribution. Make sure Java 8 (openjdk-8-jre) is installed before running Trexo PDF Signer.

What PAdES signature levels does Trexo PDF Signer support?

Trexo PDF Signer supports PAdES-B (Basic level with signature only), PAdES-T (with trusted timestamp), and PAdES-LT (Long Term with embedded validation data). These comply with EU eIDAS regulations and ensure long-term signature validity.

Can I customize the signature appearance?

Yes, Trexo PDF Signer allows full customization of visible signature appearance. You can add custom images, text, timestamps, and configure the signature box position and size. You can also create invisible signatures that don't show on the document visually.

How is Trexo PDF Signer different from jSignPDF?

Trexo PDF Signer is a modern alternative to jSignPDF with an enhanced user interface, better USB token detection, improved signature appearance options, and native Windows Certificate Store integration. Both are free and open-source Java applications for PDF signing. Trexo PDF Signer offers a more intuitive drag-and-drop signature placement and real-time preview features.

Can I sign PDFs with my DSC USB token in India?

Yes, Trexo PDF Signer fully supports Digital Signature Certificates (DSC) from Indian Certifying Authorities. It works with Class 2 and Class 3 DSC tokens from providers like eMudhra, Sify, CDAC, and others. You can use your DSC token to sign government tenders, MCA filings, GST documents, income tax returns, and legal contracts.

Which USB tokens are supported by Trexo PDF Signer?

Trexo PDF Signer supports most PKCS#11 compatible USB tokens including eToken (SafeNet/Gemalto), Watchdata ProxKey, Longmai mToken, HYP2003, and other hardware security modules. Simply install the token driver and configure the PKCS#11 library path in Trexo PDF Signer settings.

Is Trexo PDF Signer legally valid for signing documents?

Yes, digital signatures created with Trexo PDF Signer using valid certificates from licensed Certifying Authorities are legally valid under the Information Technology Act, 2000 in India, eIDAS regulation in the EU, and similar laws in other jurisdictions. The signatures are tamper-proof and include cryptographic proof of authenticity.

Trexo PDF Signer - Free PDF Signing Tool

Trexo PDF Signer is a free, open-source PDF signing tool for Windows, macOS, and Linux.

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Download Trexo PDF Signer from GitHub