Pixel Ruler — Measure Pixels Online
Pixel Ruler is a free online screen ruler that helps you measure exact pixel dimensions, pick colors, and verify UI spacing with precision. It’s designed for web designers, UI/UX developers, and digital artists who need pixel-perfect accuracy.
Drop or paste an image. Click a ruler to add a guide (drag to move, right/⌘-click a ruler to remove). Hold Space or use the middle mouse to pan. Use Ctrl/Cmd + wheel to zoom. Click the image to pin and copy a color. Drag the selection handles to resize.
Free Online Pixel Ruler Tool
Our pixel ruler tool lets you measure anything on screen with accuracy. From website banners to mobile UI elements, Pixel Ruler ensures your designs are perfectly aligned. Unlike traditional rulers, this screen ruler is built directly into your browser—no downloads required.
Features of Pixel Ruler
- 📐 Measure width × height in pixels with a live readout.
- 🖼 Upload images or drag-and-drop for instant resolution checks.
- 🔍 Fullscreen mode with zoom and pan support.
- 📊 Snap-to-grid guides for alignment verification.
- 🎨 Color picker with copy-to-clipboard HEX/RGBA values.
- 📤 Export cropped selections as pixel-perfect PNG files.
Why Use a Pixel Ruler?
A pixel measurement tool is essential for creating pixel-perfect web designs, validating CSS layouts, checking image resolutions, and verifying UI spacing. Pixel Ruler eliminates guesswork and ensures professional-grade results for developers and designers alike.
Frequently Asked Questions
Is Pixel Ruler accurate on Retina/HiDPI screens?
Yes. Pixel Ruler uses device pixel ratio rendering to ensure measurements and exports are accurate across standard and high-density displays.
Do my images get uploaded to a server?
No. Pixel Ruler runs entirely in your browser using the Canvas API. Images never leave your computer.
Can I copy a pixel’s color?
Yes. Click any pixel to pin its color, then use the popup copy button to copy HEX or RGBA values instantly.
Are PNG exports lossless?
Yes. Pixel Ruler exports are pixel-perfect crops from the original image with no compression or scaling.