DevKit
Free online developer tools
Fast, focused utilities for everyday development work. Compare text, format and validate JSON, convert Base64, inspect JWT claims, encode URLs, and generate UUIDs without unnecessary setup.
Developer tools
Search and open a tool instantly.
Text Compare
Compare two texts side by side and spot changes instantly.
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JSON Formatter & Validator
Beautify, validate, parse, and analyze nested JSON datasets.
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Base64 Encode / Decode
Convert UTF-8 text to and from standard Base64 locally in your browser.
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JWT Decoder
Inspect JWT headers and claims locally; signature verification is not included.
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URL Encode / Decode
Encode and decode URLs safely for web applications and APIs.
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UUID Generator
Generate UUID v4 and v7 identifiers instantly in your browser.
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Timestamp Converter
Convert Unix timestamps to readable dates and vice versa.
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JSON ↔ YAML Converter
Convert bi-directionally between JSON data and YAML syntax.
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XML Formatter
Beautify and format XML documents for better readability.
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Fast to use
Open a tool and start working right away—no account or setup required.
Built for real work
Compare text, format JSON, convert Base64, inspect JWT claims, encode URLs, generate UUIDs, and handle everyday developer tasks.
Privacy-minded
Every DevKit tool processes your input locally in your browser without uploading it to a DevKit server.