Encoding, hashing & crypto tools online

Encoding and hashing are fundamental operations in web development. Whether you are debugging a JWT, verifying a bcrypt hash, encoding a URL parameter, or inspecting an SSL certificate, these tools provide the cryptographic primitives you need without installing any software or sending sensitive data to a server. All crypto operations use the browser's native WebCrypto API.

// common use cases

Decode a JWT token to inspect its claims and check expiration
Hash a password candidate with bcrypt to verify it against a stored hash
Encode binary data as Base64 for embedding in a data URI
Calculate SHA-256 checksums to verify file integrity

// faq

Do any of these tools send data to a server?

No. All tools use browser-native APIs — WebCrypto for hashing and JWT signing, custom ASN.1/DER parsing for SSL certificates, and TextEncoder/atob/btoa for encoding. Nothing leaves your browser tab.

Can I use these for production key signing?

For inspection and development, these tools are ideal. For production systems, use a server-side solution with proper key management and audit trails.

Is bcrypt run locally or on a server?

Locally, via the bcryptjs library compiled to WebAssembly. Your plaintext password never leaves the browser tab.