All tools

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

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.

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

SPF / DKIM / DMARC Checker

Audit all three email auth records, count SPF lookups, find DKIM selectors.

DMARC Report Parser

Paste a DMARC aggregate XML report and read it as a table: who sends as you, pass or fail, aligned or not.

Runs in your browser

HTTP Headers Checker

Response headers, redirect chain and a security-header grade for any URL.

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