Free Developer Tools

Solve common development and debugging tasks from one focused collection. Most tools process data locally in your browser; DNS and website checkers clearly identify when a public query or URL is sent through 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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SVG Optimizer

Clean and minify SVG markup in your browser.

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Cron Expression Editor

Validate a cron expression and show its next run times.

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HTTP Headers & TLS Checker

Inspect public HTTP response headers and HTTPS connection status.

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Hreflang Checker

Find and review hreflang alternate links on a public page.

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JSON to TypeScript / Zod

Generate TypeScript interfaces or a Zod schema from JSON.

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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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DNS Lookup

Look up common DNS records for a domain name.

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Domain Availability Checker

Check whether a domain appears registered and compare common extensions.

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What Is My IP Address

Show your public IP address with its estimated location, network operator and connection details.

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WHOIS Lookup

Look up a domain’s registrar, registration and expiry dates, status codes and name servers.

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