PGP Online — Encrypt, Decrypt & Manage Keys in Your Browser
Kleopatra is a free, open-source PGP tool that runs entirely in your browser. Encrypt messages, decrypt PGP blocks, generate key pairs, and verify signatures — without installing anything or creating an account.
PGP (Pretty Good Privacy) encryption is the global standard for secure digital communication. It's used by journalists protecting sources, developers signing code releases, businesses exchanging confidential contracts, and individuals who value their privacy.
Most PGP tools require installation — GPG, Kleopatra (Gpg4win), GPG Suite. Kleopatra.app changes this by bringing the full OpenPGP workflow to the browser. Under the hood it uses the OpenPGP.js library — the same library trusted by ProtonMail — to perform all cryptographic operations locally.
The tool is fully featured: generate RSA 4096-bit key pairs, import existing keys from .asc files, encrypt messages to any public key, decrypt messages with your private key, sign messages to prove authorship, and verify signatures from others.
Everything is persistent in your browser's localStorage — so your keys are available next session without needing to re-import. And because there's no backend, there's nothing to hack on the server side. Your private key never leaves your machine.
Your privacy is guaranteed by design
All cryptographic operations in Kleopatra run entirely in your browser. Nothing you type, encrypt, decrypt, or generate is ever sent to our servers. There are no server logs, no analytics on your keys, and no accounts required. The code is open-source — you can verify every claim yourself.
Frequently Asked Questions
What is the best free PGP tool online?
Kleopatra.app is a free, open-source, browser-based PGP tool. It supports key generation, encryption, decryption, signing, and verification — all without installation.
Is it safe to use an online PGP tool?
It depends on the tool. Kleopatra.app is safe because all cryptographic operations happen in your browser — nothing is sent to our servers. The code is open-source and auditable.
Does the online PGP tool work without an internet connection?
Once the page is loaded, all cryptographic operations work offline. You only need internet to initially load the app.
Can I use PGP online for email encryption?
Yes. Encrypt your message with the recipient's public key, then send the resulting PGP block via email. The recipient decrypts it with their private key.