Free developer tools and everyday utilities
Practical tools for developers and everyday work. Every tool runs on your device: nothing you paste or open is uploaded, and there is no account to create.
Local processing · No sign-up · Works offline after the first visit
Developer & API tools
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JSON to Dart Model Generator
Turn one or more JSON API responses into null-safe Dart classes with fromJson and toJson.
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JSON Formatter & Validator
Format, minify and validate JSON, with the exact line and column of any syntax error.
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JSON Diff
Compare two JSON documents and list every added, removed and changed field by path.
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JSON to CSV Converter
Turn an array of JSON objects into CSV, with nested array selection and the columns you choose.
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cURL to Dart / Dio Converter
Convert cURL commands into Dart code for Dio or the http package, with headers, query parameters and bodies.
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Base64 Encoder & Decoder
Encode and decode Base64 with full UTF-8 support, URL-safe output and forgiving decoding.
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Unix Timestamp Converter
Convert epoch seconds and milliseconds to UTC and local dates, and dates back to timestamps.
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SQL IN Clause Generator
Turn pasted values into a quoted SQL IN list for text or numbers, with duplicates removed and chunking.
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JWT Decoder
Read JWT headers, payloads and claims with readable expiry, and see whether the signature was verified.
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More tools are on the way. Formatters, converters and PDF and image utilities will appear here once they are ready.