Viewport Size Checker

Viewport Size Checker inspects device, browser, and peripheral capabilities from your current session. Measure live viewport width and height for responsive layout testing.

Each utility on Apex Toolz has its own page so you can share a direct link with teammates.

Viewport Size Checker saves time when measure live viewport width and height for responsive layout testing—without desktop installs or mandatory cloud upload.

Freelancers can deliver client work from any machine with a modern browser.

Use it alongside other browser tools on Apex Toolz to chain convert → resize → compress → publish workflows.

• Resize your browser window
• See live viewport width and height updates
• Match common breakpoint widths for CSS
• Share the viewport-size-checker URL with teammates who need the same utility
• Use Viewport Size Checker during daily browser workflows on Apex Toolz
• Bookmark Viewport Size for repeat tasks your team performs weekly

1. 1Resize your browser window.
2. 2See live viewport width and height updates.
3. 3Match common breakpoint widths for CSS.
4. 4Download or copy the result when processing completes.
5. 5Spot-check one output before processing a large batch.

• Downloads and copies are under your control—we do not retain uploaded tool inputs on our servers.
• Related tools in the browser category appear below—chain tasks without re-uploading elsewhere.

• Extreme inputs may hit practical browser limits before server-side tools would.
• This tool assists manual workflows—it does not replace professional legal, medical, or financial advice.
• Common mistake — skipping spot-check on the first file in a batch: confirm settings on one sample before queueing hundreds.