px to rem: CSS Unit Converter

Font size, type scale, pt, dp

Only for iPhone

Free · In-App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Set your own root size and see px, rem, em, pt and % at once — plus modular type scales, 4/8pt spacing tokens and copy-ready CSS variables. px to rem, rem to px, em, pt and % — recalculated as you type, against the root font size your project actually uses. Most converters assume a 16px root and leave it there. This one lets you set the root font size, the em context size and the DPI once, then recomputes everything from that base: the live conversions, the modular type scale, the spacing tokens and the cross-platform density table. It is a native iPhone tool, so there is no browser tab to dig out and no connection required. WHAT YOU GET - Every unit at once: type one value and read px, rem, em, pt and % side by side, each copied to the clipboard with a single tap - Your own base: root size, em context and DPI sliders that persist between launches, so a 62.5% root or a non-96 DPI setup gives correct numbers rather than textbook ones - Modular type scales: choose a base size and a ratio from Minor Second (1.067) to Golden Ratio (1.618), and get Display down to Caption in px and rem - Copy-ready CSS: the whole type scale or spacing set as :root custom properties, written in rem with px comments - 4pt and 8pt spacing tokens plus the common breakpoints 640, 768, 1024, 1280 and 1536, shown in px and rem together - Pin the conversions you keep reaching for and save the rest to history, each with a mini breakdown in all five units PERFECT FOR - Front-end developers turning a design file into real stylesheet values - UI and product designers keeping type and spacing consistent across screens - Design system maintainers who want one source of truth for their tokens - Anyone working out why rem, em and % behave differently WHY NOT JUST USE A WEB CONVERTER? A web converter forgets your base the moment you close the tab, handles one value at a time, and gives you nothing to paste. Here your root size, context size and DPI persist, results appear in all five units simultaneously, pinned values stay in a Saved tab, and the type and spacing scales come out as CSS you can drop straight into a stylesheet. LEARN THE UNITS Six expandable articles cover px vs rem vs em vs pt, why rem helps accessibility, percent and font-size, DPI, PPI and device pixels, modular type scales, and 4pt and 8pt grids — each with a code sample, plus a cheat sheet (16px = 1rem = 12pt = 100%) and references to MDN, W3C, WCAG 2.2, and the Apple HIG. PRIVACY Everything is worked out and stored on your device. No account, no sign-in, no ads, no analytics SDK, no data leaves your phone. The app works completely offline. FULL ACCESS Full access unlocks the modular type-scale generator, the CSS variable export, the 4pt/8pt spacing and cross-platform density tools, plus unlimited pinned conversions and saved history. Choose a weekly plan, a yearly plan, or a one-off lifetime purchase. Payment is charged to your Apple Account at confirmation. Subscriptions renew automatically unless cancelled at least 24 hours before the current period ends, and can be managed or cancelled in your App Store account settings. The lifetime option is a single purchase and does not renew. Purchases can be restored at any time. Set your root size, type your first value, and paste the result straight into your stylesheet. Terms of Use (EULA): https://web-levi.web.app/terms Privacy Policy: https://web-levi.web.app/privacy-policy Questions? tphuc.work@gmail.com

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Bug fixes and performance improvements.

Version 1.1.1

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The developer, Phuc Pham, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

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    Information

    Provider
    • Phuc Pham
    Size
    • 4.4 MB
    Category
    • Graphics & Design
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    • Spacing & Breakpoints Lifetime 399,00 kr
    • Base Font Size Weekly 39,00 kr
    • Design System Yearly 199,00 kr
    • Learn More
    Copyright
    • © 2026 Phuc Pham
  • Developer Website
  • Privacy Policy

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