A StrawHatDevs open-source project

Dev Tools

37 free tools for developers — encoding, networking, color, formatting, and more — built by StrawHatDevs.

DNS & Domain

Dig into DNS records, WHOIS data, and email security

DNS Lookup

Query A, AAAA, CNAME, MX, TXT, NS, SOA records for any domain

DNS & Domain

Reverse DNS

Resolve an IP address back to its hostname (PTR record)

DNS & Domain

WHOIS Lookup

Get domain registration, expiry, registrar, and nameserver details

DNS & Domain

MX Lookup

List mail exchange records with priority for a domain

DNS & Domain

DNS Propagation

Check DNS record propagation across multiple global resolvers

DNS & Domain

SPF Checker

Parse and validate SPF records to prevent email spoofing

DNS & Domain

DKIM Checker

Verify DKIM public key records for a domain and selector

DNS & Domain

DMARC Checker

Parse and validate DMARC policy for a domain

DNS & Domain

Network

Diagnose connectivity, latency, and routing

Ping

Measure TCP round-trip latency to any host or IP address

Network

Traceroute

Trace the network path and latency to a destination hop by hop

Network

Port Checker

Test if TCP ports are open or closed on any host

Network

IP Geolocation

Locate any IP address with city, country, ISP, and coordinates

Network

ASN Lookup

Look up Autonomous System Number details for an IP or ASN

Network

HTTP & Web

Inspect HTTP responses, headers, and redirects

HTTP Status

Check the HTTP response status code for any URL

HTTP & Web

HTTP Headers

Inspect all response headers with explanations and security grades

HTTP & Web

Redirect Visualizer

Trace the complete redirect chain from start to final destination

HTTP & Web

Security

Audit SSL certificates and domain security posture

SSL Checker

Inspect SSL/TLS certificate details, chain, expiry, and cipher

Security
Pro

Domain Security Scanner

Full security audit: DNS, SSL, headers, SPF/DKIM/DMARC, ports, risk score

Security

Calculators

Calculate CIDR ranges and subnet configurations

CIDR Calculator

Convert CIDR notation to IP range, netmask, and broadcast address

Calculators

Subnet Calculator

Divide networks into subnets and calculate host ranges

Calculators

Discovery

Understand your own network infrastructure

What Is My Infrastructure?

Auto-detect your public IP, DNS, ISP, geolocation, and headers

Discovery

Encoding & Decoding

Encode, decode, and generate secrets, Base64, JWT, URL, and more

Base64 Encoder / Decoder

Encode text or binary data to Base64, or decode Base64 strings back to plain text

Encoding & Decoding

URL Encoder / Decoder

Encode special characters in URLs and query strings, or decode percent-encoded URIs

Encoding & Decoding
Client-side

JWT Decoder

Decode and inspect JWT header, payload, claims, and expiry — no secret required

Encoding & Decoding

HTML Entity Encoder

Encode HTML special characters (&, <, >, ", ') to entities or decode them back

Encoding & Decoding
Secure

Secret Generator

Generate cryptographically secure secrets — API keys, passwords, UUIDs, hex tokens, and JWT secrets

Encoding & Decoding

Text Utilities

Hash, diff, count, generate, and test text with regex

Hash Generator

Compute MD5, SHA-1, SHA-256, and SHA-512 hashes of any text string

Text Utilities

Lorem Ipsum Generator

Generate placeholder text by paragraphs, sentences, or word count

Text Utilities

Text Diff Viewer

Side-by-side diff of two text blocks with added, removed, and unchanged line highlighting

Text Utilities

Regex Tester

Test regular expressions against sample text with real-time match highlighting and group capture

Text Utilities

Word & Char Counter

Count words, characters, sentences, paragraphs, and estimated reading time

Text Utilities

Color Tools

Convert color formats and check WCAG contrast ratios

Color Converter

Convert colors between HEX, RGB, HSL, HSV, and CMYK formats with a live preview

Color Tools

Contrast Checker

Check WCAG AA and AAA contrast ratios between text and background colors

Color Tools

Time & Date

Convert timestamps, parse cron expressions, and translate time zones

Unix Timestamp

Convert Unix timestamps to human-readable dates and vice versa across any timezone

Time & Date

Cron Expression Parser

Parse and explain cron expressions in plain English with the next 5 scheduled run times

Time & Date

Timezone Converter

Convert a date and time across multiple global time zones simultaneously

Time & Date

Formatters

Prettify, minify, and validate structured data

JSON Formatter

Prettify, minify, and validate JSON with syntax highlighting and error detection

Formatters