Utooly

Developer Tools

The Developer Tools collection on Utooly contains free, client-side browser utilities engineered for high performance, zero data leakage, and instant productivity.

Explore free online developer tools on Utooly. Essential utilities for coding, formatting, and debugging. Fast, secure, and 100% browser-based with zero signup.

Online Compiler & IDE

Write, compile, and execute C, C++, Python, Java, JavaScript, Rust, Go, PHP, and C# code online with instant output, interactive standard input (stdin), and AI Autopilot.

JSON Formatter

Format and validate JSON data

Base64 Encoder

Encode/decode Base64 strings

HTML Escape

Escape/unescape HTML entities

Color Picker

Pick colors and get HEX, RGB values

UUID Generator

Generate universally unique identifiers (UUIDs).

File Hash Calculator

Calculate MD5, SHA1, SHA256, SHA512 hashes for files.

IP Subnet Calculator

Calculate network details from an IP address and subnet mask/CIDR.

JSON to CSV Converter

Convert JSON data (array of objects) to CSV format.

CSS Minifier

Minify CSS code to reduce file size.

HTML Minifier

Minify HTML code to reduce file size.

JavaScript Minifier/Obfuscator

Minify and perform basic obfuscation on JS code.

HTML Beautifier

Format and beautify your HTML code for readability.

Binary/Decimal Converter

Convert numbers between binary and decimal systems.

Color Converter

Convert colors between HEX, RGB, and HSL formats.

JWT Decoder & Inspector

Decode, inspect, and analyze JSON Web Token (JWT) headers, payloads, and expiration claims.

SVG Minifier & Optimizer

Clean, compress, and minify SVG vector markup, stripping metadata and unneeded precision.

Cron Expression Generator

Generate, parse, and validate cron schedules with plain English descriptions and next execution times.

SQL Formatter & Beautifier

Format, clean, indent, and minify SQL queries for MySQL, PostgreSQL, SQLite, and T-SQL.

Diff Checker & Code Comparator

Compare two text or code snippets side-by-side to highlight additions, deletions, and modifications.

Regex Tester & Debugger

Test, debug, and validate regular expressions in real-time with match highlighting and substitution.

URL Encoder/Decoder

Encode or decode strings for URL usage.

ROT13 Encoder

Encode and decode text using the ROT13 cipher.

Caesar Cipher

Encode and decode text using the Caesar cipher with custom shift values.

CSV to JSON Converter

Convert CSV data to JSON format easily.

Markdown to HTML

Convert Markdown text to HTML code with syntax highlighting.

HTML to Markdown

Convert HTML code to Markdown format.

Gradient Generator

Create beautiful CSS gradients with custom colors and directions.

CSS Box Shadow Generator

Generate CSS box shadow code with a live preview.

Color Palette Generator

Generate harmonious color palettes with HEX, RGB, and HSL values.

Border Radius Previewer

Create and preview CSS border-radius values with visual feedback.