Image Diff & Comparison Tool — Before & After Slider
Compare two images side-by-side, with an interactive before/after split slider, or generate a pixel difference heatmap highlight.
TL;DR: Image Diff & Comparison Tool — Before & After Slider is a 100% free browser-based media utility. Compare two images with interactive before/after split slider and pixel difference analysis.
Image A (Original)
PNG, JPG, WebP
Image B (Modified)
PNG, JPG, WebP
Understanding Image Diff & Comparison Tool — Before & After Slider
Compare two images side-by-side, with an interactive before/after split slider, or generate a pixel difference heatmap highlight. Designed for creators, video editors, audio engineers, web designers, and developers who need instant, high-precision processing without software installation, watermarks, or file uploads.
Mathematical Formula & Technical Methodology
Formula Variables Explained:
Computes Manhattan color distance across RGBA channel byte arrays to highlight modified pixels.
Step-by-Step Worked Example
Highlights subtle photo retouches or compression artifacts in vibrant magenta overlay.
100% Client-Side Privacy Guarantee
All media decoding, manipulation, calculations, and encoding execute locally inside your web browser using HTML5 Canvas, Web Audio API, WebCodecs, Web Crypto, and modern JavaScript engines. Zero server uploads, zero telemetry, and no registration required.
Frequently Asked Questions
- Upload two images (original and edited), drag the interactive slider split line, and inspect pixel differences, color shifts, and retouching changes in real time.
Embed This Tool
Add the live Image Diff & Comparison Tool — Before & After Slider to your own website with this embed code:
<iframe src="https://nexlove.org/embed/image-diff-viewer.html" width="100%" height="650" style="border:1px solid #e2e8f0;border-radius:12px" title="Image Diff & Comparison Tool — Before & After Slider — NexLove" loading="lazy"></iframe>