Free interactive tool
CSV ↔ JSON
Parse quoted CSV and export structured JSON or spreadsheet-safe CSV.
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Free interactive tool
Unicode Base64
Encode and decode UTF-8 text without sending input away.
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SHA-256 hash
Calculate a SHA-256 digest using browser cryptography.
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UUID generator
Generate random UUIDs using browser cryptography.
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Timestamp converter
Convert UTC ISO dates and Unix timestamps.
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Regex tester
Run a pattern in a separate worker with a time limit.
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HTML entity converter
Escape and decode common HTML entities as text.
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Colour contrast
Calculate WCAG contrast ratio for two sRGB colours.
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CSS gradient builder
Preview and copy a two-colour CSS gradient.
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JWT inspector
Decode the header and payload locally. This does not verify a signature.
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Line difference viewer
Compare added and removed text lines without executing input.
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Safe HTML preview
Preview HTML and inline CSS in a sandbox. Scripts, forms and remote resources are blocked.
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