Screen Ruler

Measure pixels on screen — DPI info and ruler

🔒 Files never leave your browser
Screen Resolution -
Viewport Size -
Device Pixel Ratio -
Estimated PPI -

Horizontal Ruler (pixels)

Vertical Ruler (pixels)

Measure Tool

Click two points on the canvas below to measure the distance in pixels.

Click two points to measure

Common Device Dimensions (pixels)

iPhone 15 Pro393 x 852
iPhone 15 Pro Max430 x 932
Samsung Galaxy S24360 x 780
iPad Air820 x 1180
iPad Pro 12.9"1024 x 1366
MacBook Air 13"1470 x 956
HD (720p)1280 x 720
Full HD (1080p)1920 x 1080
2K (1440p)2560 x 1440
4K (2160p)3840 x 2160

How to Use Screen Ruler

View ruler

Horizontal and vertical pixel rulers shown.

Measure

Click two points to get pixel distance.

View info

See DPI, resolution, and device info.

Why Choose AllTools Screen Ruler?

  • ✓ 100% free, no account needed
  • ✓ Pixel rulers
  • ✓ DPI/PPI info
  • ✓ Click-to-measure
  • ✓ Screen resolution
  • ✓ No data stored or transmitted

Why Use This Tool

  • ★ All processing happens in your browser — nothing is uploaded
  • ★ Completely free with no usage limits
  • ★ No account or registration required
  • ★ Instant results with zero latency
  • ★ Works on any device with a modern browser

Related Resources

Test responsiveness → Resize images → Convert units →

Frequently Asked Questions

How accurate is it? ▼
It measures in CSS pixels. Physical accuracy depends on devicePixelRatio and screen calibration.
Is this private? ▼
Yes. Everything runs in your browser.
Is there a file size limit? ▼
No strict limit. Processing happens in your browser, so capacity depends on your device memory. Most files work smoothly.
Which browsers are supported? ▼
All modern browsers including Chrome, Firefox, Safari, Edge, and Opera on both desktop and mobile.
Can I use this offline? ▼
Yes. Once the page is loaded, the tool works without an internet connection since all processing is local.
Is my data secure? ▼
Yes. Your data never leaves your browser. Nothing is stored on or transmitted to any server.

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