Encoders & Decoders
Encode and decode Base64, URLs, HTML entities, and JWTs without pasting secrets into a third-party server. These tools are built for debugging transport encodings and inspecting tokens while keeping sensitive strings on-device.
6 tools in this category · 91 total on DevTooKit · local-first, no upload
Tools in Encoders & Decoders
- Base64 Encode / DecodeEncode text to Base64 or decode Base64 back to UTF-8 text.
- URL Encode / DecodePercent-encode or decode URLs and query components.
- HTML Entity Encode / DecodeEscape or unescape HTML entities (& < > etc.).
- JWT DecoderDecode JWT header and payload, inspect claims and expiration — locally in your browser.
- JWT SignerSign JWTs with HS256 / HS384 / HS512 using the browser's native Web Crypto API.
- JWT Key GeneratorGenerate HMAC secrets, RSA key pairs, and ECDSA key pairs for JWT signing. PEM output.
FAQ — Encoders & Decoders
Is encoding the same as encryption?
No. Encoding makes data transport-safe or readable; encryption protects confidentiality. Treat secrets accordingly.
Is JWT decoding private here?
Yes — JWT inspection runs in your browser and does not upload tokens to DevTooKit.