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PX to REM Converter – Free Online Tool for Responsive Web Design

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PX <=> REM Converter

This is typically the root font-size set on the `html` element (often 16px).

Pixels to REM

REM to Pixels

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🧑‍💻 What is a PX to REM Converter?

A PX to REM Converter is a handy web design tool that allows developers and designers to convert pixel (px) values to rem units and vice versa. This is especially useful when creating responsive websites where consistency and scalability across devices matter.

🔍 Why Convert PX to REM?

Using REM (root em) instead of PX in your CSS makes your website more flexible and accessible. Here’s why:

✅ Scalability

REM values scale based on the root font-size of the browser, usually 16px. This means if a user changes their default browser font size, the entire layout scales naturally.

✅ Responsiveness

Responsive design is key in today’s multi-device world. REM allows your layout to adapt across desktops, tablets, and mobile devices effortlessly.

✅ Accessibility

Users with visual impairments often increase default font sizes in their browsers. Using REM ensures your content respects those settings.

📏 How to Convert PX to REM (and Vice Versa)

Formula to Convert PX to REM:

ini
rem = px ÷ root font-size

For example, if the root font-size is 16px (default for most browsers):

  • 16px = 1rem

  • 32px = 2rem

  • 8px = 0.5rem

Formula to Convert REM to PX:

ini
px = rem × root font-size

You can change the root font-size (usually set in the <html> tag in CSS) to whatever value you prefer, but 16px is the standard.

⚙️ How to Use the PX ⇄ REM Converter Tool

Using our PX to REM Converter is simple:

  1. Enter a pixel value you want to convert.

  2. Set the root font-size (default is 16px).

  3. Get the rem value instantly — or switch to convert from rem to px.

  4. Copy the result directly for use in your CSS.

No login. No ads. Just fast, accurate conversion!

🌍 Default Font Sizes by Device & Browser

Here are some standard browser font-size settings in the U.S., which make using REM even more useful:

Device Type Common Browser Default Root Font Size
Desktop Chrome, Firefox, Safari 16px
Mobile iOS Safari, Android Chrome 16px
Tablets iPad Safari, Android 16px
Accessibility Browsers NVDA, VoiceOver, JAWS User-dependent

So, if you’re designing for accessibility or responsiveness, REM is the way to go.

🧠 Pro Tip: Combine REM with Media Queries

Want to make a super-responsive website? Combine REM units with media queries to create layouts that adapt to user screen sizes and settings dynamically.

Example:

css
@media (min-width: 40rem) {
.container {
padding: 2rem;
}
}

💡 Common Use Cases for PX ⇄ REM Conversion

  • Frontend development

  • CSS frameworks (Tailwind, Bootstrap custom themes)

  • Designing scalable UI components

  • Improving accessibility in typography

  • Migrating legacy code from px to rem

📈 Why Our Tool Stands Out

✔️ Super fast & accurate
✔️ Mobile-friendly & lightweight
✔️ No ads or distractions
✔️ Adjustable root font size
✔️ Free to use—forever!

❓ Frequently Asked Questions (FAQs)

1. What is the default root font size in most browsers?

The default is 16px in most modern browsers like Chrome, Firefox, Safari, and Edge.

2. Why use REM instead of PX?

REM units scale based on user preferences and improve responsiveness and accessibility, whereas PX values remain fixed.

3. Can I change the root font size in CSS?

Yes! Use html { font-size: 18px; } in your stylesheet to set a custom root size.

4. Is REM better than EM?

Yes, because REM is relative to the root element, while EM is relative to the parent. REM ensures consistency across elements.

🛠️ Try It Now – Simple, Free, Effective!

Start using the PX ⇄ REM Converter now and make your web projects more responsive, accessible, and modern. Whether you’re a designer, developer, or beginner—this tool is built to make your life easier.

By converting px to rem, you’re making your CSS more adaptable to user settings and screen sizes, promoting accessibility and modern best practices in frontend development.