AES Encrypt / Decrypt — Encrypt text with a password and paste the result into an email, a chat, or a file. The recipient decrypts with the same password.
Encryption and decryption run in your browser. The password and the message never leave the page.
Was AES Encrypt / Decrypt useful?
Was ist AES Encrypt / Decrypt?
Encrypt text with a password and paste the result into an email, a chat, or a file. The recipient decrypts with the same password.
Encryption is AES-256-GCM (authenticated, so tampering is detected). Keys are derived from the password with PBKDF2-SHA256 and 250,000 iterations. Everything runs in your browser — the password and the message never reach a server.
So funktioniert es
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Choose encrypt or decrypt
Two modes. Same password field, different input and output sides.
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Pick a strong password
A random 20-character string is the right pick for sensitive data. Use the password generator if you do not have one.
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Encrypt or decrypt
The result is a portable text envelope you can paste anywhere.
Beispiele
Send a one-time secret in an email
Encrypt a password, a token, or a short message with a passphrase. Send the ciphertext in an email, share the passphrase by phone. The recipient pastes the ciphertext, enters the passphrase, and gets the original.
Plaintext: "Meeting at 3pm, use the back door" Password: "blue-river-42"
Ergebnis: A v1:base64... envelope that decrypts only with "blue-river-42".
Encrypt a note for yourself
Store a ciphertext in a note-taking app, a password manager, or a file. Decrypt it from any device with the password. Useful for API keys, recovery codes, or anything you do not want in plaintext.
Plaintext: an API key Password: a strong password you remember
Ergebnis: The ciphertext is safe to store. Only the password unlocks it.
Häufig gestellte Fragen
Verwandte Anleitungen
How to Encrypt a Message with a Password (in Your Browser)
A practical guide to password-based encryption: how AES-GCM with PBKDF2 actually works, why the wire format matters for future compatibility, the common foot-guns (weak passwords, no integrity check, ECB mode), and how to encrypt a message in your browser without trusting a remote service with the plaintext.
The Myth of the Secure Password in 2026 (and What Actually Matters)
A "secure" password is no longer the bottleneck. The bottleneck is everything around the password. Here is what the threat model actually looks like in 2026, why a 16-character random password is not enough on its own, and the four things that actually keep you safe.
The 6 Password Mistakes That Cost You in 2026 (and How to Avoid Them)
The six password mistakes almost everyone makes in 2026: weak passwords, password reuse, no 2FA, storing in browsers, sharing via text, and ignoring breach notifications. What actually goes wrong, the realistic cost of each, and the five-minute fix for each one.
Verwandte Werkzeuge
Passwort-Generator
Erzeugen Sie starke, zufällige Passwörter in Ihrem Browser. Wählen Sie Länge, Zeichentypen und Anzahl. Es wird nichts hochgeladen.
Password Strength Checker
See how strong a password really is — entropy, time-to-crack, and a list of issues, all computed in your browser.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes of any text instantly.
JWT-Dekodierer
Dekodieren Sie JSON Web Tokens, um Header, Payload und Signatur anzuzeigen. Kostenlos, in Ihrem Browser, ohne Upload.
Base64-Kodierer / -Dekodierer
Kodieren Sie Text oder Dateien zu Base64 oder dekodieren Sie Base64 zurück in seine ursprüngliche Form. Kostenlos, in Ihrem Browser, ohne Upload.
Base64-Dekodierer
Dekodieren Sie Base64-Strings zurück in Klartext oder Dateien. Kostenlos, in Ihrem Browser, ohne Upload.
URL-Kodierer / -Dekodierer
Kodieren oder dekodieren Sie URLs und Query-Strings für sichere Verwendung in HTML, HTTP und E-Mail. Kostenlos, in Ihrem Browser, ohne Upload.
Last reviewed: 2026-09-25