Tools
Free, fast, and no account required. Everything below runs in your browser — nothing is uploaded.
Base64 encoder and decoder
URL encoder, decoder and inspector
HTML entity encoder and decoder
Number base converter
CSV to JSON converter
YAML, XML, TOML and JSON converter
Unit converter
Text diff
Text case and line tools
Word and character counter
Markdown preview
QR code generator
QR code reader
Image colour picker
PNG compressor
Images to animated GIF
JSON formatter and validator
JSON to TypeScript and C#
Regex tester
JWT decoder and encoder
UUID and NanoID generator
CIDR and subnet calculator
chmod permissions calculator
What is my IP address
iframe tester
Unix epoch and timezone converter
Cron expression builder
Timezone meeting planner
Date difference calculator
Password generator
Hash generator (SHA-256, SHA-1, MD5)
GC content calculator
Reverse complement converter
DNA molecular weight calculator
Primer Tm calculator
Dilution calculator
Pace and speed calculator
Percentage calculator
Aspect ratio calculator
HTTP status codes
MIME types by extension
Common TCP and UDP ports
chmod permission reference
Cron syntax reference
Regex cheatsheet