Coloys Tools
Lightweight online tools for everyone — JSON, calculators, converters and more.
JSON Formatter
Format, validate and beautify JSON data
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Base64 Encoder
Encode and decode Base64 strings
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JWT Decoder
Decode and inspect JWT tokens
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UUID Generator
Generate random UUID v4 identifiers
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Regex Tester
Test and debug regular expressions
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URL Encoder
Encode and decode URL components
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QR Generator
Generate QR codes for text or URLs
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Password Generator
Generate secure random passwords
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Word Counter
Count words, characters and lines
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Character Counter
Count characters with detailed stats
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Timestamp Converter
Convert between timestamps and dates
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Age Calculator
Calculate exact age from birth date
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BMI Calculator
Calculate Body Mass Index
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Percentage Calculator
Calculate percentages and ratios
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Loan Calculator
Calculate loan payments and interest
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Tip Calculator
Calculate tip and split bills
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