Free AES Encrypt/Decrypt Online — No Signup Required
AES Encrypt/Decrypt helps you Encrypt and decrypt text with AES-GCM using the Web Crypto API — secure client-side encryption tool — free, in 2026, without leaving the browser. It is built for developers, analysts, and privacy-conscious teams, so you can securely encode, decode, compare, or inspect sensitive values with a fast public URL, clear output, and a workflow that stays focused on the task instead of setup.
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What is AES Encrypt/Decrypt?
AES (Advanced Encryption Standard) is the most widely used symmetric encryption algorithm in the world, approved by NIST and used in TLS, file encryption, and secure messaging protocols. AES-256 encrypts data with a 256-bit key derived from your passphrase using PBKDF2, producing ciphertext that is computationally infeasible to brute-force. This tool lets you encrypt and decrypt text strings in the browser — useful for testing encryption logic, protecting notes or credentials before storing them, or understanding how AES works in practice.
All encryption runs inside your browser using the Web Crypto API. No text, no password, and no ciphertext is ever sent to any server. AES-GCM (Galois/Counter Mode) is the recommended mode — it is authenticated, meaning it detects tampering in addition to providing confidentiality. AES-CBC (Cipher Block Chaining) is supported for interoperability with older systems. The same passphrase and mode used to encrypt must be used to decrypt, so store the passphrase securely.
- 1
Select Encrypt or Decrypt
Choose the operation you need. To decrypt, you must use the exact passphrase and mode used during encryption.
- 2
Enter your text and passphrase
Paste the plaintext (for encryption) or ciphertext (for decryption) and enter your passphrase.
- 3
Copy the result
The encrypted ciphertext or decrypted plaintext appears instantly. Copy and store it securely.
- AES-256 encryption runs entirely in the browser — no server upload
- Supports AES-GCM (authenticated) and AES-CBC modes
- PBKDF2 key derivation with configurable iteration count
- No account or API key needed
Continue this workflow with nearby browser-based tools so you can validate, convert, and ship output without context switching.
- Free security & encoding tools category pageSee every browser-based security & encoding workflow in one index.
- About this siteWho built these tools and why everything runs in your browser.
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AES Encrypt/Decrypt FAQs
Quick answers about the workflow, privacy, and where this tool fits in a broader job.
Is browser-based AES encryption secure?
For testing and learning, yes. For production use, encryption should be performed in a controlled backend environment. Browser-based encryption is vulnerable to XSS attacks that could expose the plaintext or key before encryption completes.
What mode should I use — GCM or CBC?
AES-GCM is recommended for most cases. It is an authenticated encryption mode, meaning it detects if the ciphertext was modified after encryption. AES-CBC does not have this property and requires a separate message authentication code (MAC).
Can I decrypt text encrypted by another AES tool?
Yes, if the other tool uses the same algorithm (AES-256), mode (GCM or CBC), key derivation function (PBKDF2), and passphrase. AES is standardized, so interoperability is possible when parameters match.
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Tested in Chrome, Firefox, and Safari on desktop and mobile.