Free toolsAll free tools
Size converter.
The sizes of web design, converted: pixels, rem, em, points and inches, and aspect ratios. Six free tools with tables of common values.
Aspect ratio calculator
The ratio of any size, and new sizes that keep it.
Open the toolPX to REM
Pixels to rem for CSS, at any root font size.
Open the toolREM to PX
Rem back to pixels, at any root font size.
Open the toolEM to PX
Em to pixels, at the parent element’s font size.
Open the toolPT to PX
Points from Word or print to screen pixels.
Open the toolPixels to inches
Pixels to inches and centimeters, at any DPI.
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More free tools
Other free tools.
- Image convertersWebP, PNG, JPG and SVG into each other, and images to and from Base64.
- Color toolsHEX, RGB and CMYK codes, complementary colors, a color picker and image palettes.
- Font convertersTTF, OTF, WOFF and WOFF2 into each other, with a preview of every font.
- Text and code toolsA JSON formatter, Lorem ipsum placeholder text, and text in any case, with word and character counts.
- All free toolsSmall tools for the jobs around a website: images, colors, sizes and fonts, alt text, prompts for AI builders, and a check whether AI agents can use your site. The converters run in your browser, so nothing is uploaded.
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