39 Free Tools · No Registration · Browser-Based

Free Online Developer Tools

A curated collection of essential web tools. JSON formatting, image compression, QR code generation and more — all running locally in your browser.

All Tools

39 tools

📋

JSON Formatter

Format, validate and beautify JSON data with syntax highlighting.

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🔍

Regex Tester

Test and debug regular expressions online with match highlighting.

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🔐

Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 to text instantly online.

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🔣

HTML Entity Encoder

Encode and decode HTML entities for special characters.

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#️⃣

Hash Generator

Generate MD5, SHA-1, SHA-256 hashes from text input.

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🎫

JWT Decoder

Decode and verify JSON Web Tokens to view payload data.

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📝

Markdown Preview

Live preview Markdown rendering with split-screen editor.

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⚖️

Text Diff

Compare two texts and highlight differences between them.

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⏱️

Timestamp Converter

Convert between Unix timestamps and human-readable dates instantly.

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📊

CSV to JSON

Convert between CSV and JSON formats easily.

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Case Converter

Convert text between camelCase, snake_case, PascalCase and more.

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🔢

Number Base Converter

Convert between binary, octal, decimal, and hexadecimal.

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🎨

Color Converter

Convert between HEX, RGB and HSL color formats instantly.

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🔗

URL Encoder/Decoder

Encode or decode URL strings instantly online.

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🔑

Password Generator

Generate strong, secure passwords with custom options.

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🖼️

Image Compressor

Compress JPEG and PNG images online, reduce file size without losing quality.

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📱

QR Code Generator

Generate QR codes from text or URLs. Free online QR code maker.

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💪

BMI Calculator

Calculate your Body Mass Index. Free online BMI checker for health.

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🔮

UUID Generator

Generate random UUID/GUID identifiers for your applications.

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📄

Lorem Ipsum

Generate placeholder text for your designs and layouts.

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🔤

Word Counter

Count words, characters, sentences and paragraphs in your text.

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🔄

Text Processor

Remove duplicates, sort lines, reverse text and more operations.

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🌐

UserAgent Generator

Generate random UserAgent strings for testing and development.

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⚡

JS/HTML Minifier

Minify or format JavaScript and HTML code instantly.

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🎨

CSS Minifier

Minify or format CSS code instantly.

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📄

XML Formatter

Format, minify and sort XML nodes alphabetically.

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🗃️

SQL Formatter

Minify or format SQL queries with proper indentation.

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⏰

Cron Parser

Parse and generate Cron expressions for scheduled tasks.

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📐

Unit Converter

Convert between length, weight, temperature, area, volume and more.

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🔌

Port Scanner

Look up common network ports and their services.

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🌐

HTTP Status Codes

Look up HTTP status codes and their meanings.

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📋

JSON ↔ YAML

Convert between JSON and YAML formats easily.

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⌨️

Keyboard Tester

Test keyboard keys and see their codes in real-time.

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🖱️

Mouse Tracker

Track mouse coordinates and movement in real-time.

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🎨

Box Shadow Generator

Generate CSS box-shadow with live preview.

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📐

Flexbox Generator

Visual Flexbox layout generator with CSS code.

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📺

Screen Info

Display screen resolution, window size and device info.

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🎲

Random Generator

Generate random numbers, passwords, colors and more.

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📅

Date Calculator

Calculate date differences and add/subtract time.

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Why FreeOnlineTools?

🚀

Fast & Free

All tools are completely free with zero hidden fees. Instant results.

🔒

Privacy First

All processing happens in your browser. Your data never leaves your device.

📱

Works Anywhere

Use on desktop, tablet, or mobile. Fully responsive design.