Pixel Perfect Pro

Pixel Perfect Pro puts your design mockup on top of the live page so you can match the implementation pixel by pixel — the fastest way to catch a 2px offset, a wrong font size, or a misaligned grid before review does. Free, with no catch - No ads. No account. No tracking — your images never leave the browser. - Everything you can use today stays free, forever. New advanced features may arrive as paid extras someday, but nothing you rely on will move behind a paywall. Match designs against the real page - Unlimited overlays, stored separately per website. - Opacity, inversion (for dark pages), scale, rotation, and exact width. - Blend modes — set Difference and every mismatching pixel lights up (also Multiply, Overlay, Screen, Exclusion). - Compare mode: a draggable slider that wipes between design and page. - Drag the overlay with the mouse or nudge it 1px at a time from the keyboard. - Lock the overlay in place and click straight through it to use the page. Layout tools - Column grid with Bootstrap, Tailwind, and Material presets — or your own columns, gutters, max-width, and offsets. - On-page rulers and guide lines for measuring distances. Made for daily QA work - Fully customizable hotkeys for every action. - Add designs by drag & drop, paste from clipboard, or download by URL. - Handles large images (50 MB+ exports are fine). - Works inside iframes — pick the exact frame from the toolbar popup. - Light and dark themes with customizable colors. - A quick interactive tour walks you through every control on first run. - The overlay comes back after a page reload, exactly where you left it. Privacy Everything is stored locally in your browser. The extension collects nothing, sends nothing, and shows no ads. Found a bug or missing a feature? Tell us: https://www.pixperfectpro.com/contact/