Free Online Developer Tools & Calculators
Fast, free, and privacy-friendly tools for developers and everyday use. No sign-up required.
Developer Tools
JSON Formatter
Format, validate and beautify JSON data instantly.
jsonformatvalidate
Base64 Encoder / Decoder
Encode or decode Base64 strings online.
base64encodedecode
URL Encoder / Decoder
Encode or decode URLs and query parameters.
urlencodedecode
Regex Tester
Test regular expressions with live match highlighting.
regexregexptest
Markdown Preview
Write Markdown and preview the HTML side by side.
markdownpreview
Cron Generator
Build cron expressions with a visual editor.
cronscheduler
Password Generator
Generate strong, random passwords instantly.
passwordsecurity
UUID Generator
Generate RFC 4122 compliant UUID v4 values.
uuidguid
Color Converter
Convert colors between HEX, RGB, and HSL formats.
colorhexrgb
Hash Generator
Generate SHA-1, SHA-256, SHA-512 hashes instantly.
sha256hashmd5
Timestamp Converter
Convert Unix timestamps to human-readable dates.
timestampunixepoch
Word Counter
Count words, characters, sentences and reading time.
word countcharacter count