Small, focused tools for people who work with networks and servers. Every calculator runs locally in your browser, so addresses, tokens, hashes and files never leave your device.
Network and server
Subnet CalculatorIPv4 network, broadcast and usable host range
HTTP Status CodesEvery 1xx-5xx code with a plain-English meaning
Unix Timestamp ConverterEpoch to date and date to epoch, in UTC and local time
Cron GeneratorDescribe a cron expression in English and copy it
Chmod CalculatorOctal, symbolic and copy-ready chmod commands
Encoding and security
Hash CalculatorMD5, SHA-1, SHA-256 and SHA-512 for text or files
Base64 Encoder / DecoderUTF-8 safe Base64, including the URL-safe alphabet
URL Encoder / DecoderPercent-encoding for URLs, components and form data
JWT DebuggerDecode a token, inspect claims and check expiry
Generators and formatting
UUID GeneratorGenerate version 4 UUIDs in bulk
Password GeneratorCryptographically random passwords with an entropy estimate
JSON FormatterFormat, validate and minify JSON
No accounts, no uploads and no server-side processing. The only network requests are the page itself and optional analytics described in the privacy policy.