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Free developer tools online

18 tools without sign-up. They run locally in your browser — your data is never uploaded.

Developer8

Subnet calculatorCIDR, netmask, host range and subnets Cron expression parserExplain cron schedules and see the next runs JWT decoderDecode JWT header, payload and expiry Unix timestamp converterEpoch time to date, and date to epoch Number base converterBinary, octal, decimal, hex and base 36 HTTP status codesSearchable list of all HTTP status codes MIME types listFind the Content-Type for a file extension Regex testerTest regular expressions with live highlighting

Data5

Hash generatorMD5, SHA-1, SHA-256/384/512 and CRC-32 Base64 encoder/decoderEncode and decode Base64 and Base64URL UUID generatorBulk UUID v4 and v7 in your browser Password generatorRandom passwords with exact entropy JSON formatterValidate, pretty-print or minify JSON

SEO & publishing1

Redirect generatorRedirect rules for your server

Domains & URLs3

DNS record builderGenerate correct DNS zone records with a simple form URL encoder / decoderPercent-encode or decode URLs and parameter values URL parserSee every part of a URL, from protocol to fragment

Scraping1

HTTP headers parserRaw headers to table, JSON or code

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