Polypane

Stop resizing your browser

Emulate real devices, use your CSS breakpoints or pick your own dimensions. No resizing needed.

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Get the full overview, your way

Line your viewports up horizontally or vertically, focus in on a single viewport in focus mode or get the classic browser style in our full mode. Your choice.

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Emulate popular devices

Checking to see if your site or app renders well on user devices becomes easy and fast with the built-in list of popular device emulators. With full touch support.

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Detect CSS breakpoints. Automatically

Use the CSS breakpoints in your style to automatically generate viewports for every view your site supports.

One click gives you a full overview of your CSS breakpoints, or a simplified view that covers the full range of your site.

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Sync all your actions

Scrolling, clicks, navigation, hover styles and form input are automatically synced between all panes. Easily verify that your site works as intended on all viewports.

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Build pixel perfect sites

Compare the expected design to your live page with different comparison modes built right in.

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* We think sites don't have to be pixel perfect but getting close is nice

Live reloading built in

Your page will automatically refresh whenever you change a file. CSS and images are updated without a page refresh, like magic.

You can also automatically reload the page at a set interval and other hot reloading tools work great with Polypane too.

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Full page screenshots

You want best in class screenshots, and we have them. No other browser comes close in terms of rendering accuracy. We also support screenshots of all your viewports.

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Powerful developer tools

Devtools like you're used to, with support for devtools extensions too.

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Your favorite DevTools extensions

Install and use your favorite Chromium devtools, with support for React DevTools, Vue.js DevTools, Redux DevTools and many more.

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More than just responsive design tools

Over 15 overlays let you easily check contrast and accessibility, edit your page visually, test for visual impairments and more.

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Light and dark modes

Polypane comes in a light and dark theme, so it always fits in with your desktop.

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Zoom your entire browser

Sometimes you just need to fit a 4K screen and an iPhone side by side. Zoom individual panes, or your entire browser, to get the view you need.

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And so much more

  • Customizable device presets
  • Works perfectly with hot reloading tools
  • Clean UI mode for screencasts and demos
  • Powerful testing with custom HTTP headers
  • Layout stress-testing with random pane sizes
  • Tons of keyboard shortcuts
  • Reorder, resize and zoom individual panes
  • Store your favorite panes in Workspaces
  • Monthly updates

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On Mac, Windows & Linux
Photo of Kilian

Hi! I'm Kilian, the creator of Polypane.

Like you, I'm a web developer. I'm like writing HTML, CSS and JavaScript and using everything that dev tools have to offer. In nearly 20 years of creating for the web, I've built many open source apps and libraries. I write about them and other things that interest me on my blog.

I'm building my own browser.

Before I started doing that, I ran an internet agency. I constantly felt pressure from clients to develop sites faster and here I was, resizing my browser to work on each screen size one-by-one. I was wasting so much time just resizing my browser.

More than that, I saw many opportunities to make the process so much better, to make a browser that works for me instead of against me. So that is my goal: make the ultimate browser for developers and designers.

Polypane can easily cut your development time in half, and I'm just getting started.

 PolypaneChromeFirefox
Devtools
Dockable devtools
Devtools extensions
    
Rotate devices
Device presets
Customisable device presets
Basic auth support and management
    
View site in multiple viewports----
Browser resizing not needed----
Synced scrolling----
Synced interactions----
Easy to add/remove panes----
Freeform panes----
Size panes in EMs----
Re-order panes----
Zoom to fit panes----
    
Breakpoint detection----
Layout stress testing----
CSS layout debugging----
    
Fullscreen mode
Focus mode----
Clean mode----
Workspaces----
    
Full page screenshots
Viewport screenshots
Overview screenshots----
    
Hot reloading support
Live reloading built-in----
    
Basic auth support and management
Full documentation
Up to date rendering engine
Cross-platform
Browser extension for Chrome----
Browser extension for Firefox----

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A browser that makes you awesome

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Polypane screenshot
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