Verify Digital Signatures & Extract Certificates Instantly.
Securely extract X.509 (.cer) certificates from signed PDFs for
GST, MCA, and GeM portals.
Processed entirely in your browser memory — no files are ever stored.
Drag & drop your signed PDF here
or click to browse · Max 20MB
How It Works
Extract your digital signature certificate in seconds — no signup, no software install.
Secure Upload
Upload your digitally signed PDF. The file is processed entirely in-memory — never written to disk or stored anywhere.
Instant Verification
We scan all signature fields, decode the PKCS#7 container, and verify signer identity, issuer CA, and validity dates.
Download .cer
Download the raw X.509 DER certificate as .cer or .CER — ready for upload to GST, MCA, GeM, or any government portal.
Zero Data Stored. Total Privacy Guaranteed.
Your files are processed in-memory and immediately discarded after extraction. No data is logged, no cookies track you, and no file ever touches permanent storage. Your sensitive documents remain yours — always.
Frequently Asked Questions
What is a Digital Signature Certificate (DSC) and why do I need the .cer file?
A Digital Signature Certificate (DSC) is an electronic document issued by a licensed Certifying Authority (CA) that binds the identity of a person to their public key. Many Indian government portals (GST, MCA, GeM, IOCL) require you to upload this certificate file (.cer or .CER) separately during registration or document submission.
What is the difference between .cer and .CER files?
The files are identical in content — both contain the same raw X.509 DER-encoded certificate bytes. The only difference is the file extension casing. Some older government portals reject .cer but accept .CER, or vice versa. We provide both options.
Is my PDF uploaded to a server? Is my data safe?
Your PDF is sent to the server only for processing. No file is stored on disk — it is read into memory, processed, and immediately discarded. The extracted certificate bytes are held in a temporary in-memory session that is cleared after your downloads.
My PDF says it is signed but no certificate was found — why?
This can happen if the PDF uses a non-standard signature format, the PKCS#7 blob is corrupted, the PDF was signed with a test certificate, or the PDF is password-protected. Try opening it in Adobe Acrobat Reader to check the signature panel.
Can this tool handle PDFs with multiple digital signatures?
Yes. The tool scans all signature fields in the PDF and extracts a certificate from each one. You will see separate certificate cards for each signer, each with its own download buttons. You can also download all certificates at once as a ZIP archive.
What does "X.509 DER format" mean and why does it matter?
X.509 is the international standard for public key certificates. DER (Distinguished Encoding Rules) is the binary serialisation format — compact and universally understood by operating systems and government portal software. When a portal asks for a "certificate file", it expects a DER-encoded X.509 certificate, which is exactly what the .cer/.CER files contain.
Are the extracted certificates legally valid?
Yes. The certificates extracted by our tool are the exact, unaltered X.509 DER files embedded by the original signer. Because we do not modify the cryptographic signature or the PKCS#7 container, the resulting .cer files are completely valid and fully accepted by Indian government portals (GST, MCA, GeM, etc.) and international verification systems.
Do you keep a copy of my PDF or my certificates?
Absolutely not. We employ a strict zero-data-retention policy. Your PDF is processed entirely in the temporary volatile memory (RAM) of our servers. Once the certificate is extracted and your browser session ends, the file and its contents are instantly and permanently destroyed. No files ever touch a hard drive.
Is it safe to use this tool for sensitive or confidential documents?
Yes, it is highly secure. The connection between your browser and our extraction engine is protected by bank-grade TLS encryption. Because the file is processed in memory and immediately discarded, there is zero risk of data leaks. We do not require you to create an account, meaning your identity and your documents remain completely anonymous.