Free Online Developer Tools

Collection of essential tools: Base64 Encode/Decode, Base64 to Image, Image to Base64, URL Encode/Decode, JWT Decoder/Encoder, JWT Secret Generator, QR Code Generator, Color Picker, Regex Tester, Cron Parser, UUID Generator, Remove Space, JSON Formatter, XML Formatter, Timestamp Converter, YAML to JSON, JSON to YAML, Text Differ and more. All tools work instantly online without uploads. Fast, beautiful, and easy to use!

Popular Tools

Base64 Encode/Decode

Encode text to Base64 or decode Base64 strings back to text. Preview images from Base64 encoded strings instantly without external tools.

Base64 to Image

Convert Base64 encoded strings directly to viewable images. Download the generated image files instantly and securely on your device.

Image to Base64

Upload any image file and convert it to Base64 format instantly. All processing happens on your device for maximum security and privacy.

URL Encode/Decode

Safely encode URLs with special characters or decode encoded URLs. Full UTF-8 support for international characters and symbols.

JWT Decoder

Decode JWT tokens and inspect claims, headers, and payloads. Verify signatures using HMAC (HS256/384/512) or RSA (RS256/384/512) algorithms.

JWT Encoder

Create and sign JWT tokens with HMAC algorithms (HS256, HS384, HS512). Add custom claims and verify token signatures instantly.

JWT Secret Key Generator

Generate strong random secret keys for JWT HMAC signing. Multiple output formats: Hex, Base64, URL-Safe Base64, and plain text.

UUID Generator

Generate UUID v4 and v6 identifiers instantly with full history tracking. Copy individual IDs or download entire generation history.

Remove Space

Remove all spaces, tabs, and whitespace characters from your text instantly. Perfect for cleaning data or preparing text for processing.

JSON Formatter

Format, minify, and validate JSON data. Explore JSON with interactive tree view. Identify syntax errors and issues instantly.

XML Formatter

Format, minify, and validate XML documents. Pretty-print complex XML with proper indentation. Detect and fix formatting issues quickly.

Timestamp Converter

Convert Unix timestamps to human-readable dates and times. Convert date/time strings to Unix timestamps with timezone support.

YAML to JSON

Convert YAML format to JSON instantly. Full validation and error reporting. Perfect for configuration file conversion and data transformation.

JSON to YAML

Convert JSON data to YAML format with proper formatting. Ideal for creating configuration files and documentation with readable structure.

Text Differ

Compare two texts side-by-side and get detailed analysis. See character, word, and line counts. Find first difference location instantly.

QR Code Generator

Generate QR codes for URLs, text, WiFi, or any data. Customize size and colors, then download as PNG instantly.

Color Picker

Advanced color picker with HEX, RGB, HSL, HSV conversion. Create and save color palettes for your design projects.

Regex Tester

Test and debug regular expressions with real-time highlighting. Match details and common pattern library included.

Cron Expression Parser

Parse cron expressions to human-readable format. See when tasks will run next with detailed schedule preview.