Free Online Developer Tools

6 essential developer tools — each with its own dedicated page for faster access. Base64, JWT, JSON, URL, Regex, and SHA-256 Hash. Everything runs in your browser. Nothing is stored or sent anywhere.

Base64 Encoder Decoder

Encode text or binary data to Base64, decode Base64 strings back to readable text. Supports Unicode and URL-safe Base64.

base64 encodebase64 decodedata URIbinary encoding

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JWT Decoder

Decode any JSON Web Token instantly. View header algorithm, payload claims, expiry time. Detects expired tokens. Zero server contact.

JWTJSON Web Tokenauth tokendecode JWT

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JSON Formatter & Validator

Beautify minified JSON, validate syntax, minify for production, sort keys alphabetically. Instant error detection.

JSON formatJSON beautifyJSON validateJSON minify

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URL Encoder Decoder

Percent-encode special characters for safe URL transmission, decode %xx sequences. Parse full URLs into components.

URL encodepercent encodingquery stringURL parse

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Regex Tester

Test regular expressions against sample text. See all matches, capture groups, and index positions. g, i, m, s flags. Find & replace.

regex testregular expressionpattern matchingfind replace

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SHA-256 Hash Generator

Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes from text or files. Browser Web Crypto API — nothing leaves your device.

SHA-256file checksumhash textcryptographic hash

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Why These Tools Run In Your Browser

Most online developer tools send your data to their servers for processing — which means your JWT tokens, API keys, private text, and file contents are transmitted over the internet. Our tools use only browser-native APIs: btoa/atob for Base64, JSON.parse/stringify for JSON, crypto.subtle for hashing, and encodeURIComponent for URL encoding. Nothing leaves your machine.