Free Developer Tools

Solve common development and debugging tasks from one focused collection. Most tools process data locally in your browser; website checkers clearly identify when a public URL is fetched by the server.

Tools

JSON Formatter

Format, validate and minify JSON.

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UUID Generator

Generate random UUIDs.

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Unix Timestamp

Convert between Unix timestamps and dates.

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Base64 Encoder / Decoder

Encode and decode Base64 text.

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URL Encode / Decode

Encode and decode URL text and query values.

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Hash Generator

Generate SHA-256, SHA-384 and SHA-512 hashes.

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File Size Converter

Convert between decimal and binary file size units.

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JSON ↔ CSV

Convert between a JSON array of objects and a CSV table.

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JWT Decoder

Decode a JWT header and payload.

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Regex Tester

Test a regular expression against text.

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Meta Checker

Check a page's title, description, canonical and other meta tags.

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Open Graph Checker

Check a page's Open Graph and Twitter Card tags.

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Robots.txt Checker

Check a domain's robots.txt rules and declared sitemaps.

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Sitemap Checker

Check a sitemap.xml file and count its URLs.

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Website Launch Checker

Run a one-page pre-launch checklist against a public URL.

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