Free Developer Tools

Essential tools for developers — formatters, generators, encoders, and more.

Base64 Encoder & Decoder

Encode and decode Base64 strings instantly in your browser. Supports text and file encoding with no data sent to any server.

Developer Tools

Border Radius Previewer

Design and preview CSS border-radius values visually. Adjust each corner independently and copy the generated CSS. Free and instant.

Developer Tools

Box Shadow Generator

Design CSS box shadows visually with a live preview. Adjust offset, blur, spread, and color, then copy the generated CSS code.

Developer Tools

Chmod Calculator

Calculate Unix file permissions with a visual editor. Convert between numeric (755) and symbolic (rwxr-xr-x) formats instantly.

Developer Tools

Code Minifier

Minify HTML, CSS, and JavaScript code instantly. Remove whitespace, comments, and unnecessary characters to reduce file size.

Developer Tools

Code to Image Converter

Turn code snippets into beautiful images. Choose themes, add window chrome, and export as PNG. Free Carbon alternative — no signup required.

Developer Tools

Color Picker

Pick colors and convert between HEX, RGB, HSL, and HSB formats. Copy color codes instantly for your design projects.

Developer Tools

Cron Expression Generator

Build and validate cron expressions with an interactive visual editor. See the next scheduled run times for any cron pattern.

Developer Tools

CSS Gradient Generator

Create beautiful CSS gradients visually. Generate linear, radial, and conic gradient code with a live preview and one-click copy.

Developer Tools

Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files. Verify file integrity with instant client-side hashing.

Developer Tools

HTML Entity Encoder & Decoder

Encode special characters to HTML entities or decode entities back to text. Handles named and numeric entities. Free and private.

Developer Tools

IP Address Lookup

Find your public IP address and look up geolocation, ISP, and network details for any IP address instantly.

Developer Tools

JSON Formatter & Validator

Format, validate, and minify JSON data instantly in your browser. Free online JSON beautifier with syntax highlighting.

Developer Tools

JWT Decoder

Decode and inspect JSON Web Tokens instantly. View headers, payloads, and claims without any server-side processing.

Developer Tools

Markdown Editor & Preview

Write and preview Markdown in real time. Supports GitHub Flavored Markdown with tables, task lists, syntax highlighting, and export.

Developer Tools

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal. Essential tool for developers and computer science students.

Developer Tools

Regex Tester

Test and debug regular expressions in real time. Validate regex patterns with match highlighting, capture groups, and capture group display.

Developer Tools

SQL Formatter

Format and beautify messy SQL queries instantly. Supports standard SQL syntax. Free, private, browser-based.

Developer Tools

Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Support for seconds, milliseconds, and multiple time zones.

Developer Tools

URL Encoder & Decoder

Encode and decode URLs and query strings instantly. Convert special characters to percent-encoded format for safe use in web addresses.

Developer Tools

UUID Generator

Generate random UUIDs (v4) and other versions instantly. Copy unique identifiers for databases, APIs, and testing workflows.

About Our Free Developer Tools

Whether you are debugging an API response, formatting messy JSON, or generating unique identifiers, the right developer tool saves hours of manual work. UtilityDocker brings together the most frequently needed coding utilities in one place so you never have to hunt across multiple sites again.

Key Features

JSON formatting and validation
Base64 encoding and decoding
Code minification and beautification
Hash generation (MD5, SHA-256)
Regex testing and debugging
UUID and token generation

Why Use UtilityDocker?

Every developer tool on UtilityDocker runs entirely in your browser. Source code and API keys never leave your machine, making these tools safe for proprietary projects and sensitive data.

UtilityDocker is built for speed, privacy, and simplicity. There are no accounts to create, no software to install, and no hidden fees. Every tool loads instantly and works on desktop, tablet, and mobile browsers. Bookmark this page and come back any time you need a reliable, free developer tool.