DevTools
Subnet calculation, DNS lookup, IP conversion, SSL certificate checks, and more — the networking utilities developers reach for, in one place. Most run in the browser; some use a server API.
IP / Subnet
Subnet Calculator
Compute network/broadcast/host range and mask from an IPv4 CIDR.
CIDR ↔ Range
Convert between CIDR and IP ranges and count the addresses covered.
IP Base Converter
Convert IPv4 between decimal integer, hex, and binary.
IPv6 Compress/Expand
Compress (::) or expand IPv6 addresses and validate them.
MAC Address Tool
Reformat and validate MAC addresses; analyze local/unicast bits.
DNS / Network
Web / Security
Encoding / Convert
Base64 Encoder
Encode/decode text to and from Base64 (UTF-8 supported).
URL Encoder
URL-encode and decode strings.
JWT Decoder
Decode a JWT's header and payload and check its expiry.
Timestamp Converter
Convert between Unix timestamps and dates, both ways. Supports timezones and ms/s units.
JSON Formatter
Pretty-print or minify JSON and validate it, with error location.
Hash Generator
Generate SHA-1/256/384/512 hashes of text (Web Crypto).
Regex Tester
Test regular expressions and highlight matches and capture groups.
Regex Snippets
Search and copy common regex patterns — email, URL, date, and more.
Cron Parser
Explain a cron expression in plain English and show the next run times.
UUID / ULID Generator
Bulk-generate UUID v4, v7 and ULID. Uppercase and hyphen options, all generated in your browser.
Diff Checker
Compare two texts side by side with line and character level highlights.
JSON Converter
Convert JSON to YAML, CSV or TypeScript types, and YAML back to JSON.
QR Code Generator
Generate QR codes from URLs or text and download as PNG/SVG. Everything runs in your browser.