Free Developer Tools

33 free tools — 5 AI-powered. All processing happens in your browser. No signup. No tracking.

⭐ Most Popular

Base64 Encoder/Decoder

Encode or decode Base64 text and files online. Free, instant, 100% private — all processin

Generate MD5, SHA-1, SHA-256, SHA-512 hashes.

URL Encoder/Decoder

URL encode or decode strings for safe web usage. Free, instant, 100% private — all in your

Generate UUID v1, v4. Batch generate multiple UUIDs.

Decode JWT tokens. View header, payload, signature.

Compare two texts side-by-side. AI explains differences.

Regex Tester AI

Test regex patterns. AI generates regex from plain English.

🔧 Encoders & Formatters

Validate JSON with detailed error messages. Shows JSON structure tree with keys, types, de

HTML Entity Encoder

Encode/decode HTML entities — angle brackets, ampersands, quotes to entities and back. Ful

Minify CSS: remove comments, whitespace, last semicolons. See size comparison and compress

JavaScript Minifier

Minify JavaScript: remove comments, whitespace. See size comparison. Free, instant, privat

Minify HTML: remove comments, whitespace between tags. See compression stats. Free, instan

Paste HTML code, see live rendered preview in sandboxed iframe. Includes basic CSS reset.

Markdown Table Generator

Create and edit Markdown tables visually. Click cells to edit, set alignment, add/remove r

⚡ Generators

.gitignore Generator

Generate .gitignore files for any tech stack. Select languages, frameworks, editors. Copy

README Generator AI

Create professional GitHub README files from a description. Includes badges, install, usag

cURL Command Builder

Build cURL commands visually. HTTP method, URL, headers, body, flags. Live command output.

SQL Query Generator AI

Generate SQL queries from plain English. Supports MySQL, PostgreSQL, SQLite, SQL Server.

Cron Expression Parser

Parse cron expressions to human-readable description. Show next N execution times. Build c

🐛 Testing & Debugging

Test REST APIs directly in browser. Send HTTP requests, view response status, headers, bod

Regex Explainer AI

Paste any regex and get a human-readable breakdown — plain English, component table, use c

Regex Visualizer

Visualize and explain regex. Highlighted matches, capture groups table, plain-English expl

AI Code Explainer AI

Paste any code and get a plain-English explanation. Supports all languages. DeepSeek AI.

Color Converter

Convert colors between HEX, RGB, HSL, HSV, CMYK formats. Color picker with live preview. C

📚 Lookup & Reference

Look up DNS records for any domain. A, AAAA, MX, CNAME, TXT, NS, SOA. Uses Google DNS-over

Look up IP address information: geolocation, ISP, timezone, ASN. Auto-detect your IP or qu

Check SSL certificate details. Issuer, validity dates, days remaining, SANs, certificate c

Look up domain registration info using RDAP. Find registrar, creation date, expiry, namese

HTTP Status Codes

Browse HTTP status codes by category (1xx-5xx). Search by code. Each shows reason phrase,

MIME Type Lookup

Search/browse IANA MIME types by file extension or type. Full reference table of common MI

Unicode Analyzer

Inspect Unicode characters. See code point, UTF-8/UTF-16 bytes, HTML entity, URL encoding,