Free developer and SEO tools that run in your browser
No signup, no waitlist, nothing logged. Just open a tool and use it.
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Tool index
Developer tools
07- JWT DecoderDecode the header and payload of a JWT without the token ever leaving your browser.
- .env ValidatorCatch quoting, duplicate and syntax bugs in a .env file before they break your deploy.
- Cron Expression ParserTranslate a cron expression into plain English and see exactly when it runs next.
- UUID GeneratorGenerate cryptographically random UUID v4 or time-ordered UUID v7, in bulk.
- Base64 Encoder & DecoderEncode and decode Base64 with correct UTF-8 handling, including the URL-safe alphabet.
- Unix Timestamp ConverterConvert epoch timestamps to readable dates and back, with automatic unit detection.
- SHA Hash GeneratorCompute SHA-1, SHA-256, SHA-384 and SHA-512 digests of any text, in your browser.
SEO tools
03- SERP Snippet PreviewSee how your title and meta description will be truncated in Google, measured in pixels.
- UTM BuilderBuild campaign URLs that GA4 actually attributes, with the mistakes flagged as you type.
- URL Slug GeneratorTurn any headline into a clean, ASCII-safe URL slug, accents and symbols included.
How these are built
- Client-side
- Tokens, config files and URLs are processed in your browser. There is no server to log them, because there is no server.
- Documented
- Every tool states what it does, what it deliberately refuses to do, and where its answers stop being reliable.
- Unmetered
- No account, no quota, no upgrade prompt. Open it, use it, close the tab.