small tools for everyday data

Six things you keep googling, on one page.

Timestamps, JSON, Base64, URL escaping, UUIDs, SHA hashes. Everything runs in the browser — no requests leave this page, so it works fine with the network off.

Unix seconds
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UTC
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Local
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ISO 8601
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Timestamp converter

Paste a Unix timestamp (seconds or milliseconds — both are detected) or any date string.

JSON formatter

Reformat, minify, or check that a payload parses. Errors report the character offset.

Base64 and URL encoding

Base64 is UTF-8 safe in both directions. URL encoding escapes every reserved character, which is what you want when a value goes into a query string.

UUIDs, random strings, SHA hashes

UUIDs and random strings come from the browser's cryptographic RNG. Hashes use SubtleCrypto, so they match sha256sum on the same bytes.