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Featured Online Tools
Most popular and useful tools for everyone.
JSON Formatter
Format and beautify JSON online.
ASCII Converter
Convert text to ASCII codes online.
Base64 Encoder
Encode and decode Base64 strings online.
JWT Decoder
Decode and inspect JWT tokens safely, locally.
URL Encoder
Percent-encode and decode URLs with ease.
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Convert between Unix time and human dates.
Learn & Explore
Guides, explainers and developer resources.
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What Is Base64? Encoding, Not Encryption
Base64 is a way to represent binary data as text. Understand what it does, where it is used, and why it is not encryption.
5 min read
btoa('51NAV'); // "NTe5TkFW"
atob('NTe5TkFW'); // "51NAV" How to Encode and Decode Base64
Practical Base64 commands for the browser, terminal, and Python — plus tips for Base64URL used in tokens.
6 min read
header.payload.signature
What Is a JWT? Understanding JSON Web Tokens
JWT (JSON Web Token) is a compact, URL-safe way to represent claims between two parties. Learn its structure and where it is used.
4 min read
function decodeJwt(token) {
const [, payload] = token.split('.');
const b64 = payload.replace(/-/g, '+') How to Decode a JWT (Without Breaking Security)
Decode the header and payload of a JSON Web Token to inspect its claims — safely and locally.
5 min read