ToolkitBook

ToolkitBook

Browser-Based Utilities for Developers and Creators

ToolkitBook offers a suite of free online tools tailored for developers, designers, and creators. Whether you need to format code, convert file types, or perform quick calculations, our tools handle the work entirely within your browser. This ensures your data stays on your machine and is never sent to a server.

🛠️ All Tools (50)

CSS Formatter & Minifier: Beautify and Optimize CSS Online

CSS Batch Processor: Format, Optimize & Minify Multiple Files

JavaScript Formatter & Minifier: Beautify and Optimize Code Online

JavaScript Batch Processor: Format, Purify, and Minify Multiple JS Files

JSON Formatter & Validator: Beautify and Validate JSON Online

JSON to XML Converter: Convert JSON to XML Online

XML to JSON Converter: Online Conversion Tool

Interest Calculator: Compare Simple and Compound Interest

Mortgage Calculator: Estimate Monthly Home Loan Payments

Word Counter: Online Character & Word Count Tool

Chinese Character Counter: Online Hanzi and HSK Analysis

Word Frequency Counter: Online Word Occurrence & Text Analysis Tool

Projector Throw Distance Calculator: Screen Size & Placement Tool

Free Online Stopwatch with Multiple Lap Timers

Area Calculator: Calculate the Area of 2D Shapes Online

Volume Calculator: Calculate the Volume of 3D Shapes Online

Addition Worksheet Generator: Create Custom Math Practice Sheets

Subtraction Worksheet Generator: Create Custom Math Practice Sheets

Multiplication Worksheet Generator: Create Custom Math Practice Sheets

Division Worksheet Generator: Create Custom Math Practice Sheets

Sitemap.xml Validator: Online Error Checker & Validation Tool

Password Generator: Create Secure Random Passwords Online

Unit Converter: Metric & Imperial Conversion Tool

BMI Calculator: Calculate Your Body Mass Index Online

ID Card Watermark Tool: Protect Identity Documents Online

Passport Watermark Tool: Add Text Watermarks to Scans Online

JWT Secret Key Generator: Generate HS256, HS384, and HS512 Keys

Keyword Frequency Counter: Analyze Word Occurrences Online

Keyword Frequency Counter from File: Analyze TXT and PDF Word Counts

Image Format Converter: Convert to PNG, JPEG, WebP, or BMP Online

Sitemap XML Checker: Validate Sitemaps & Identify Errors

Sitemap XML File Checker: Upload & Audit Your Sitemaps

Base Converter: Binary, Octal, Decimal, and Hexadecimal

RGB to CMYK Converter: Online Color Space Conversion

Chinese Lunar Calendar Converter: Solar and Lunar Date Conversion

Pixel Art Generator: Convert Photos to Pixel Art Online

Beamer Calculator: LaTeX Slide Dimensions and Margins

Coin Flip: Online Heads or Tails Decision Maker

Cylinder Volume Calculator: Calculate from Diameter or Radius

HTML Formatter: Clean and Beautify HTML Code Online

Batch HTML Formatter: Process Multiple Files Simultaneously

HTML to Markdown Converter: Convert HTML Source to Markdown Online

Traditional Japanese Colors: 150+ Swatches with Hex Codes

Traditional Chinese Colors: 150+ Swatches with Hex Codes

XML Formatter & Minifier: Format, Minify, and Validate XML Online

XML Batch Formatter & Minifier: Format and Minify Multiple XML Files

SVG to PNG Converter: Export SVG to PNG, JPEG, or WebP

Base64 Encoder & Decoder: Convert Text to Base64 and Back Online

Encoding Decoder: Detect and Decode Base64, URL, Hex, and HTML Entities Online

JSON Sort – Sort JSON Arrays by Key (Free & Instant)