TOOL COLLECTION
Design & Display Tools
Calculate common display values such as image ratios, CSS units, and color contrast.
FREE ONLINE TOOLS
Tools ready to use
5 tools
Design
Aspect Ratio Calculator
Reduce width and height to a simple ratio, or calculate the missing dimension from a target ratio.
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Image Compressor to Target KB
Compress a JPG, PNG, or WebP toward a 100 KB, 200 KB, or custom limit without uploading the image.
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Combine Images · Image Joiner
Join 2–4 images side by side or vertically into one image. Check the output dimensions first, then choose the gap and background.
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px to rem Converter
Convert CSS values both ways between px and rem using a configurable root font size.
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Color Contrast Checker
Calculate the WCAG contrast ratio and show AA/AAA text plus AA graphics and UI results.
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