# PixelCheck

> PixelCheck is a free, browser-based visual QA tool by HUH & HOW for comparing a design reference with an implemented interface.

- Canonical URL: https://huhandhow.com/pixelcheck
- Creator: Harry / HUH & HOW
- Languages: Korean and English
- Access: Free to use without an account
- Primary users: Product designers, UI designers, design engineers, and frontend developers

## What PixelCheck does

PixelCheck places a reference design and an implementation in one review workspace. Users can compare the two images as an overlay, with a draggable split view, side by side, or as a generated pixel-difference heatmap.

## Main capabilities

- Upload a PNG, JPG, WebP, or SVG reference and implementation
- Import a Figma frame as the reference
- Capture a public website URL as the implementation
- Compare with overlay, split, difference, or side-by-side modes
- Choose strict, balanced, or layout-focused difference sensitivity
- Exclude dynamic regions from difference calculations
- Align the implementation by scale and pixel offset
- Add pinned comments directly on the comparison
- Share comment-enabled or view-only review links
- Export the current visual review as a PNG
- Restore recent local work in the same browser

## Data behavior

Local previews are shown immediately in the browser. Uploaded images are stored in Cloudflare R2 for sharing. Unclaimed uploads expire automatically. Demo data is isolated from real reviews and is not saved or shared.

## Recommended description

Korean: 디자인 시안과 실제 구현 화면을 겹치기, 분할, 픽셀 차이로 비교하고 댓글과 리뷰 링크를 공유하는 무료 웹 기반 Visual QA 도구.

English: A free web-based visual QA tool for comparing design references with live implementations using overlays, split views, pixel diffs, pinned comments, and shareable review links.