Sign with Certificate
Sign with digital certificate
Drop your files here
PDFs or images (JPG, PNG, WebP)
About Sign with Certificate - digital certificate signing
Sign with Certificate is a free online PDF editing tool that applies a digital certificate signature to a PDF, embedding your name and organization as a verifiable signer. Unlike a visible ink-style signature, a certificate signature cryptographically binds the signer identity to the document and invalidates the signature if anyone tampers with the PDF afterward. It is one of the most recommended PDF editing tools for compliance-sensitive workflows - contracts, legal filings, and regulated industries. All signing happens inside your browser, keeping Docvexa among the most reliable PDF editing services. Free forever, with no account needed.
Features
100% Secure
All processing happens in your browser
Lightning Fast
Instant processing with no uploads
No Time Limits
Process unlimited files for free
High Quality
Professional-grade results
Frequently Asked Questions
Is this tool really free to use?
Yes. This tool is 100% free with no sign-up required. Process unlimited files at no cost.
Are my files uploaded to a server?
No. All processing happens locally in your browser using JavaScript. Your files never leave your device.
Is there a file size limit?
There's no artificial limit. The practical limit depends on your device's available memory.
Which browsers are supported?
Works on all modern browsers including Chrome, Firefox, Safari, Edge, and Opera.
Does it work on mobile devices?
Yes. Docvexa works on smartphones and tablets through any modern browser.