Calculator Tools
Age Calculator
Calculate years, months and days between two calendar dates.
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Search the U18-CHAN collection or choose a category. Every built-in tool works directly in your browser.
Developer Tools
Base64 Decoder
Decode a standard Base64 string back into UTF-8 text.
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Base64 Encoder
Encode Unicode text as a Base64 string.
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Binary Converter
Convert UTF-8 text to eight-bit binary groups and back.
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BMI Calculator
Calculate adult BMI from height and weight in metric units.
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Case Converter
Switch between sentence case, title case, UPPERCASE and lowercase.
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Character Counter
Check character counts with and without spaces for short-form writing.
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CSS Formatter
Make CSS source more readable with consistent indentation.
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Date Calculator
Count days between dates or add days to a calendar date.
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Discount Calculator
Calculate the saving and final price after a percentage discount.
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HTML Formatter
Indent HTML source for easier reading and editing.
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Image Compressor
Re-encode a JPEG or WebP image at your chosen quality.
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Image Converter
Export a supported image as JPEG, PNG or WebP.
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Image Cropper
Crop a precise rectangle using pixel coordinates and a live preview.
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Image Metadata Viewer
Inspect image dimensions, file details and common JPEG EXIF fields.
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Image Resizer
Set new pixel dimensions while preserving proportions if needed.
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JavaScript Formatter
Format JavaScript source without executing it.
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JPG to PNG
Convert a JPEG image into a PNG file in your browser.
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JSON Formatter
Format JSON with readable indentation and check for syntax errors.
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JSON Minifier
Remove unnecessary whitespace from valid JSON.
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JSON Validator
Check whether a JSON document has valid JSON syntax.
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JSON Viewer
Explore nested JSON objects and arrays in a collapsible tree.
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Keyword Density Checker
Measure exact phrase frequency in a piece of text.
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Length Converter
Convert metres, kilometres, centimetres, inches, feet and miles.
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