PerfectPixel Browser Extension
Drop your mockup on the live page. Catch the misaligned padding, the mismatched color, the wrong font size. Ship once, not three times.
PerfectPixel Browser Extension launched on March 14, 2019 with 10 votes, #1,074 of 2,994 launches that month and more than 75% of that year's launches. The site was still online in September 2026, 7 years on.
In plain words
PerfectPixel Browser Extension is a tool for developers and designers that overlays design mockups directly onto live web pages to verify pixel-perfect accuracy. It catches misaligned padding, color mismatches, and font size discrepancies during development or visual QA testing. The extension offers fine-tuned controls including arrow key navigation for precise movements, opacity adjustment, and a "Difference" mode for visual regression checking. It supports both hand-written and AI-generated code, making it useful for teams seeking to reduce design implementation revisions.
written from the facts on this page · September 2026
From the sources
Drop your mockup on the live page. Catch the misaligned padding, the mismatched color, the wrong font size. Overlay the design directly on your page for a pixel‑perfect match. Catch every mismatch before it ships, in development or visual QA, whether the code is hand‑written or AI‑generated. Arrow keys for 1px moves, Shift+arrows for 10px. Mousewheel opacity, centering, HiDPI scale, touch support, and keyboard shortcuts for fast toggling. “Difference” flags every mismatched pixel, a fast visual-regression check against the approved design. “Multiply” and “Overlay” for color and tone. Load several images at once from files, clipboard, or URLs. Overlays are kept per domain across sessions and…from welldonecode.com
Does a similar job
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AnyPixels.js2016 · googlecreativelab.github.io · ▲198A web-friendly way for anyone to build unusual displays
Lost Pixel – open-source visual regression testing for your frontend2022 · github.com · ▲90Hey! My name is Dima, I am from Ukraine and I am the co-founder of Lost Pixel! We built this tool to solve our problems at work and decided to open-source it so more people can build their custom visual regression testing pipelines! If you want to chat about the tool or visual regression testing in general I am super excited to meet like-minded people! Thanks a lot for checking out the product and I hope it will serve you well if you decide to try it out :D
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