Encryption & Hashing Tools
Encryption and hashing are the tasks where using an online tool feels most uncomfortable — because the input is usually a secret. That discomfort is correct for most websites, which is why every tool in this category runs entirely in your browser and transmits nothing.
This category covers four jobs: symmetric encryption, password hashing, general-purpose hashing, and decoding JWTs. All four are client-side, so keys and tokens you paste never leave your device.
Symmetric encryption and hashing
AES/DES Encrypt performs symmetric encryption and decryption with configurable key sizes and modes, which is what you want for encrypting a value you will decrypt later with the same key.
Hash Tool computes multiple hash algorithms for checksums and integrity checks, and Bcrypt Hash produces bcrypt hashes for password storage — the algorithm you should be using for passwords rather than a fast hash.
Decoding tokens
JWT Decoder splits a JSON Web Token into its header, payload, and signature so you can read the claims. This is a decode, not a verification: it shows you what the token says, not whether it is trustworthy.
That distinction matters. Never paste a production token into a service that verifies signatures server-side; here, decoding happens locally and nothing is stored.
What runs where
All cryptographic operations execute in your browser using standard libraries. Keys, plaintext, and tokens are not uploaded, logged, or retained.
The practical limit is your own device: very large inputs depend on available memory, and nothing is recoverable after you close the tab.
Frequently asked questions
Is anything I encrypt uploaded?
No. All operations run in your browser; keys, plaintext, and tokens are never transmitted.
Can this verify whether a JWT signature is valid?
The decoder shows the header, payload, and signature. It reads claims locally and does not verify trust.
Should I use these for production secrets?
Use them for inspection, testing, and development. For production key management, use your platform's secret store.
Are these tools free?
Yes. All four are free with no account and no usage limit.