Online Developer Tools

Free, fast developer tools. Most run entirely in your browser, a few use our secure servers. Your data is never stored.

Encoding & Decoding

Base64 Encode

Encode text or binary data to Base64 format.

Base64 Decode

Decode Base64 strings back to plain text or binary.

URL Encode

Percent-encode text for safe use in URLs.

URL Decode

Decode percent-encoded URL strings.

Hex Encode

Convert text to hexadecimal representation.

Hex Decode

Convert hexadecimal strings back to text.

HTML Entity Encode

Escape special characters as HTML entities.

HTML Entity Decode

Unescape HTML entities back to characters.

Image to Base64

Convert images to Base64 encoded strings for CSS and HTML embedding.

Text & Data

JWT Decoder

Decode and inspect JSON Web Token header and payload.

JSON Formatter

Format, validate and minify JSON with syntax highlighting.

Markdown Preview

Write Markdown and see a live HTML preview side by side.

Text Analyzer

Count characters, words, sentences, paragraphs and estimate reading time.

Text Diff Checker

Compare two blocks of text side by side and highlight differences.

Lorem Ipsum Generator

Generate placeholder text for designs and layouts.

CSS Minifier / Beautifier

Minify or beautify CSS code with size stats.

Markdown to HTML

Convert Markdown syntax to clean HTML with live preview.

Cron Expression Parser

Parse and explain cron expressions with next execution times.

Generators & Testers

Hash Generator

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from text.

UUID Generator

Generate UUIDs in versions 1, 3, 4, 5, 6 and 7.

Regex Tester

Test regular expressions against sample text with live matching.

Password Generator

Generate cryptographically secure random passwords.

Color Converter

Convert between HEX, RGB and HSL color formats with live preview.

Timestamp Converter

Convert between Unix timestamps and human-readable dates.

Network & Security

DNS Lookup

Query DNS records (A, AAAA, MX, TXT, CNAME) for any domain.

HTTP Header Inspector

Inspect HTTP response headers for any URL.

SSL Certificate Checker

View SSL/TLS certificate details for any website.

WHOIS Lookup

Look up domain registration and ownership information.

IP Address Lookup

Look up geolocation and ISP information for any IP address.

CIDR / Subnet Calculator

Calculate network address, broadcast, subnet mask and host range from CIDR.