Developer Tools
Fast, private developer utilities that run in your browser — formatters, encoders, generators, and decoders.
Developer Tools
JSON Formatter
Pretty-print, minify, and validate JSON.
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JSON Validator
Validate JSON and see parse errors.
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UUID Generator
Create one or many UUIDs.
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Base64 Encoder / Decoder
Encode and decode Base64 text.
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URL Encoder / Decoder
Percent-encode and decode URLs.
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Unix Timestamp Converter
Seconds, milliseconds, and human dates.
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JWT Decoder
Decode JWT header and payload locally.
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Calculators
Percentage Calculator
Percent of, change, and difference.
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Age Calculator
Exact age, totals, and next birthday.
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Compound Interest Calculator
Estimate investment growth over time.
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Mortgage Calculator
Monthly payment and amortization summary.
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