Developer.
Free online developer tools: JSON formatter, Base64 encoder, URL encoder, hash generator, UUID generator, color converter, password generator, and QR code generator.
13 tools — no sign-up required
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JSON Formatter
Format, validate, and minify JSON. Shows error with line number for invalid input.
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Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to plain text instantly.
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URL Encoder / Decoder
Encode special characters in URLs or decode percent-encoded URL strings.
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Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text input.
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UUID Generator
Generate random UUIDs (v4) using cryptographically secure random values.
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Color Converter
Convert colors between HEX, RGB, HSL, and CMYK formats with live preview.
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Password Generator
Generate strong, random passwords with custom length and character options.
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QR Code Generator
Generate QR codes from any URL, text, or data. Download as PNG.
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JWT Decoder
Decode JWT header and payload instantly. See all claims including expiry. No token leaves your browser.
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Regex Tester
Test regular expressions with live match highlighting. Supports named groups, flags, and all modern JavaScript regex features.
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YAML ↔ JSON Converter
Convert YAML to JSON or JSON to YAML instantly in your browser. Bidirectional conversion with copy and download.
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Cron Expression Builder
Parse any cron expression into a human-readable schedule description. Supports *, */n, ranges, and lists.
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My IP Address
Find your public IP address, country, city, ISP, and timezone. Powered by Cloudflare — no third-party services.
See also