Built to beat the best equivalent online: faster, clearer, and private. Tools marked green never send your input anywhere.
Developer tools
Category page →JWT Decoder
Decode and inspect JSON Web Tokens locally, with expiry timeline and signature check.
Runs in your browser
Cron Expression Builder
Build cron schedules with buttons, see the next 10 runs instantly.
Runs in your browser
Base64 Encoder / Decoder
Base64, Base64url, URL and hex, fully UTF-8 safe, with files and auto-detect.
Runs in your browser
Keyboard Layout Converter
Recover text typed in the wrong layout: AZERTY, QWERTY, QWERTZ, Dvorak, both ways.
Runs in your browser
Epoch Converter
Unix timestamp to date and back, seconds or milliseconds, with a live clock.
Runs in your browser
Regex Tester
Build and debug regular expressions live, with match groups. Stays in your browser.
Runs in your browser
UUID Generator
Generate v4 and v7 UUIDs in bulk, with an inspector. Crypto-grade, in your browser.
Runs in your browser
Network tools
Category page →NebulaTerm
A free, local SSH, serial and Telnet terminal for network engineers. Open source, no telemetry.
Free desktop app · download
IPv4 Subnet Calculator
CIDR, masks, ranges and subnet splitting with a visual map of the address space.
Runs in your browser
DNS Lookup
Every record for a domain, plus a zone health read that flags missing MX, SPF, DMARC and CAA.
What Is My IP
Your public IP address, plus what your browser quietly reveals about you.
MAC Address Vendor Lookup
Find the manufacturer behind a MAC from its OUI, and flag randomized MACs.
Runs in your browser
Wildcard Mask Converter
Convert subnet mask, wildcard and CIDR three ways, with the Cisco ACL context.
Runs in your browser
WHOIS / RDAP Lookup
Owner, registrar, dates, nameservers and abuse contact for any domain or IP, via RDAP.
IP Geolocation Lookup
A verdict (hosting, VPN, mobile or residential) plus country, ASN, reverse DNS and a map, for any IP.
Security tools
Category page →Password Generator
Cryptographically secure passwords and passphrases, with real crack-time estimates.
Runs in your browser
SSL Certificate Checker
Expiry countdown, chain details, protocol and SAN list for any HTTPS host.
Hash Generator
MD5, SHA-256, SHA-512 and HMAC for text and files, with checksum verification.
Runs in your browser
Email & DNS tools
Category page →SEO tools
Category page →Sysadmin tools
Category page →Chmod Calculator
Octal, symbolic and special bits both ways, with plain-English meaning and warnings.
Runs in your browser
Kill Process on Port
Type a port and get the exact command to find and kill what is using it, on Windows, Linux and macOS.
Runs in your browser
Data Transfer Calculator
Convert Mbps to MB/s, decimal to binary units, and get real transfer times.
Runs in your browser