All Tools
Every tool on ToolStack, organized by category.
Developer Tools
JSON FormatterFormat, beautify, minify and validate JSON instantly — right in your browser.JSON ValidatorValidate JSON instantly and find syntax errors with the exact line, column and position — right in your browser.Base64 Encoder/DecoderEncode text to Base64 and decode Base64 back to text with full Unicode and emoji support — 100% in your browser.
Text Tools
Converters
Unit ConverterConvert between units of length, weight, temperature, volume, area and speed.CM to InchesConvert centimetres to inches instantly — fast, free and private.Inches to CMConvert inches to centimetres instantly — fast, free and private.Miles to KMConvert miles to kilometres instantly — fast, free and private.KG to LBConvert kilograms to pounds instantly — fast, free and private.
Calculators
Age CalculatorCalculate exact age in years, months, days and more — right in your browser.Percentage CalculatorCalculate percentages in multiple modes: X% of Y, X is what % of Y, and percent change.BMI CalculatorCalculate your Body Mass Index instantly with metric and imperial units.Tip CalculatorCalculate tip amounts and split bills easily with preset or custom tip percentages.Discount CalculatorCalculate the final price after a discount and see how much you save.
Image Tools
Image CompressorCompress JPG, PNG and WebP images right in your browser. Adjust quality, format and size, download the results — images never leave your device.Image ResizerResize images to exact dimensions while keeping aspect ratio — right in your browser.JPG to PNGConvert JPG images to PNG format instantly — 100% in your browser.PNG to JPGConvert PNG images to JPG format instantly — 100% in your browser.JPG to WebPConvert JPG images to WebP format for smaller file sizes — right in your browser.WebP to JPGConvert WebP images to JPG format for maximum compatibility — right in your browser.Image CropperCrop images to exact dimensions with preset aspect ratios — right in your browser.HEIC to JPGConvert HEIC (iPhone) photos to JPG format — right in your browser.
Color Tools
Color PickerPick any color and copy its HEX, RGB, HSL and HSV values instantly.HEX to RGBConvert HEX color codes to RGB values instantly — free and private.RGB to HEXConvert RGB values to a HEX color code instantly — free and private.Color ConverterConvert between HEX, RGB, HSL, HSV and HWB color formats in any direction.Gradient GeneratorCreate CSS linear and radial gradients visually and copy the CSS code.Contrast CheckerCheck the WCAG contrast ratio between text and background colors instantly.CSS Color GeneratorTurn a base color into a 10-step shade scale and export it as CSS variables.