Is SagePDF safe to use?

Yes. All processing happens in your browser. Your files never leave your device or get uploaded to any server.

Do files upload to servers?

No. Everything runs client-side. We never see, store, or transmit your documents.

Yes. No signup, no hidden limits, no payment. Use it as often as you need.

Can I use this for large PDFs?

Yes. Very large files may take longer depending on your device, but there are no artificial limits.

Does this work on mobile?

Yes. SagePDF runs in your browser, so it works on phones, tablets, and desktops.

Validate PDF Signature Windows

Use SagePDF to validate pdf signature windows. Verify digital signatures in your PDF files. Check certificate validity, view signer details, and confirm document integrity. All processing happens in your browser. Use SagePDF in your browser—no uploads, no signup, your files stay on your device.

This tool is coming soon.

We’re building more PDF tools that run entirely in your browser. Check back later or try one of the tools above.

How to use

Add files

Drag and drop your files or click to browse. Your files stay in your browser and never leave your device.

Process

Run the tool. All processing happens locally in your browser—no uploads to our servers.

Download

Download your result. No account required.

Frequently asked questions

Digital Signature PDF
Add a cryptographic digital signature to your PDF using X.509 certificates. Supports PKCS#12 (.pfx, .p12) and PEM formats. Your private key never leaves your browser.
Sign PDF
Add digital signatures to PDFs.
View Metadata
Inspect the hidden properties of your PDF.