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lab.tools

Free Tools

Utilities we reach for daily — client-side tools that never send your data anywhere, plus live scanners we run against your infrastructure, not ours.

Live scanners

live scan

Security headers checker

Grade any site's HTTP hardening headers — CSP, HSTS, framing, cookies.

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live scan

Email deliverability scan

SPF, DKIM, DMARC and MX audit for any domain — the checks inbox providers actually run.

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In-browser utilities

in-browser

JSON formatter

Validate, prettify and minify JSON with precise error locations.

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in-browser

JWT decoder

Inspect header and payload claims, check expiry — nothing leaves your browser.

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in-browser

Cron explainer

Translate a 5-field cron expression into plain English and preview next runs.

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in-browser

Regex tester

Test a pattern against sample text with live match highlighting.

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in-browser

Base64 codec

Encode and decode Base64 and Base64URL, UTF-8 safe.

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in-browser

Unix timestamp converter

Convert Unix seconds or milliseconds to dates and back.

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in-browser

UUID generator

Cryptographically random v4 UUIDs, generated locally.

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