Цифровая Подпись PDF Онлайн

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.

Internet connection required

Signing may need to fetch certificate chain information from your certificate issuer's server to validate the signature.

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PDF документы

Ваши файлы безопасно обрабатываются прямо в браузере.

Как это работает

1

Upload PDF

Select the PDF document you want to sign

2

Upload Certificate

Укажите ваш файл сертификата (.pfx или .p12) и введите пароль

3

Sign & Download

Примените цифровую подпись и скачайте подписанный документ

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Часто задаваемые вопросы (FAQ)

Что такое цифровая подпись?

A digital signature is a cryptographic mechanism that verifies the authenticity and integrity of a document. Unlike a drawn signature, it uses public key cryptography (X.509 certificates) to prove the signer's identity.

What certificate formats are supported?

We support PKCS#12 format certificates (.pfx, .p12) which contain both your certificate and private key in a single encrypted file. These are commonly issued by certificate authorities.

Is my private key safe?

Yes! All processing happens entirely in your browser. Your certificate, private key, and PDF-файлы never leave your device or get uploaded to any server.

Will the signature be valid in PDF readers?

Yes, the tool creates standard PKCS#7 detached signatures that are recognized by all major PDF viewers. For full validation, use a certificate from a trusted Certificate Authority.