Developer Tools

Free Online Developer Tools

Fast, free utilities for encoding, formatting, and converting data.

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About Developer Tools

Free online developer tools for encoding, formatting, validation, and security. Our developer toolkit includes a JSON formatter and validator, Base64 and URL encoder/decoder, hash generator (MD5, SHA-1, SHA-256, SHA-512), regex tester and debugger, HTML entity encoder/decoder, UUID generator, JWT decoder, timestamp converter, password generator and strength checker, XML formatter, HTML/CSS minifier, URL parser, subnet calculator, and more. All tools run entirely in your browser with no server uploads — your sensitive code and data never leave your device. Every tool is free, requires no sign-up, and delivers instant results.

All Developer Tools

Free Tool

QR Code Generator

Create custom QR codes for URLs, WiFi, text, and more. Customize colors, size, and download as PNG or SVG.

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Free Tool

Base64 & URL Encoder

Encode and decode Base64 and URL strings with full Unicode support. Fast, local, and free.

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Free Tool

JSON Formatter & Validator

Format, validate, minify, and beautify JSON. Get instant validation feedback and file statistics.

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Free Tool

Hash Generator (MD5 / SHA)

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files. All locally in your browser.

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Free Tool

Regex Tester & Debugger

Test regular expressions with live match highlighting, capture group extraction, and flag support.

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Free Tool

HTML Entity Encoder / Decoder

Encode text to HTML entities or decode HTML entities back to readable text. Prevent XSS and debug HTML.

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Free Tool

UUID Generator

Generate RFC 4122 v4 UUIDs instantly. Create one or many, with or without hyphens, upper or lowercase.

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Free Tool

Password Generator

Generate strong, secure random passwords. Customize length, character sets, and see strength in real-time.

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Free Tool

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds.

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Free Tool

JWT Decoder

Decode JSON Web Tokens to inspect header and payload. View claims, expiration, and issuer info instantly.

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Free Tool

Number Base Converter

Convert numbers between Binary, Octal, Decimal, and Hexadecimal instantly. Supports large numbers via BigInt.

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Free Tool

XML Formatter & Validator

Format, beautify, minify, and validate XML. Get instant error feedback with line numbers and statistics.

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Free Tool

HTML Minifier

Minify HTML by removing comments, whitespace, and redundant tags. Reduce file size instantly.

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Free Tool

CSS Minifier

Minify CSS by removing comments, whitespace, and unnecessary characters. Optimize stylesheets.

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Free Tool

URL Parser

Parse URLs into components: protocol, host, port, path, query params, and fragment. Copy any part.

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Free Tool

URL Encoder / Decoder

Encode unsafe URL characters or decode URL-encoded strings for debugging, redirects, and APIs.

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Free Tool

HTML Table Generator

Generate clean, styled HTML tables with custom rows, columns, header colors, and alternating row backgrounds.

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Free Tool

Password Strength Checker

Check password strength with real-time analysis of length, characters, uniqueness, patterns, and estimated crack time.

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Free Tool

Subnet Calculator

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

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Free Tool

Keyboard Tester

Test every key on your keyboard with a visual layout. See real-time feedback as you press each key.

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Common Use Cases

Perfect for API debugging, JWT token inspection, data format transformation, file integrity verification, password security auditing, URL parameter analysis, network configuration, and daily development workflows.

Frequently Asked Questions

Are these developer tools safe for production code?

Yes. All processing happens locally in your browser using standard Web APIs. Your code, tokens, and data are never transmitted to any server. This makes them safe for debugging production credentials, JWTs, and API keys.

Do I need to install anything to use these tools?

No installation required. Every tool works directly in your browser. Just open the page and start using it immediately — no downloads, no plugins, no sign-up.

What encoding formats are supported?

We support Base64 encode/decode, URL encode/decode, HTML entity encode/decode, Base64url (for JWT), and binary/text conversion. All with full Unicode support including emojis and CJK characters.

Free Forever · No Sign-up

179 Free Tools at Your Fingertips

All free online tools for developers, designers, students, and creators. Every tool works in your browser — no sign-up, no data collection.

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