Image & Video Quality Comparator

Compare two images/videos with a slider or split view. Synced zoom, pan and playback. 100% local, no uploads.

🔍 Free image & video comparison tool — compare visual quality with a before/after slider or side-by-side view. Sync zoom, pan, and video playback to spot every detail. Files are processed locally in your browser: no uploads, no sign-up, and works offline. Compare two images, two videos, or a video with a still image. Image & Video Quality Comparator helps you review photo compression, video encoding, AI upscaling, photo editing, design revisions, and screenshot changes. See format, resolution, duration, and file-size savings while keeping your original files private. 【KEY FEATURES】 ✦ Private, Local & Offline Image Comparison Your photos, screenshots, artwork, and footage never leave your device. Everything runs locally in your browser, with no file uploads or account required. ✦ Before/After Slider & Side-by-Side Comparison • Slider view: overlay two files and drag the divider to reveal fine details, compression artifacts, and visual changes in exactly the same area. • Split view: place images or videos side by side to compare overall quality and composition. Switch between modes in one click; your last choice is remembered. ✦ Synchronized Zoom & Pan for Detailed Image Diff Both files stay aligned as you zoom and pan, making it easier to inspect the same pixels and regions. Use mouse-wheel or trackpad zoom, pinch-to-zoom, zoom buttons, double-click for 1:1 original pixels, or fit to view. ✦ Synchronized Video Comparison & Playback Compare two videos on one shared timeline. Play, pause, and seek both videos together, with continuous drift correction for frame-aligned viewing. Adjust speed from 0.25x to 2x, enable looping, and switch audio between muted, A, and B. Ideal for video quality comparison, codec tests, bitrate checks, and encoder tuning. ✦ Image + Video Comparison Compare a video frame with an exported image or reference still. The video plays normally while the image remains fixed. ✦ Resolution, File Size & Compression Savings View file format, size, original resolution, and video duration. See B's file-size change relative to A as a percentage—useful for comparing WebP vs. JPEG, compressed vs. original images, or different video exports. Hide the information badges for a clean viewing area. ✦ Fast, Convenient Workflow Drag in two files at once to fill A and B automatically. Swap A/B with one click, press Space to play or pause, and press Esc to leave full-screen comparison. ✦ Popular Image & Video Formats Open common image formats such as PNG, JPEG, and WebP, and video formats such as MP4. Format and codec support depends on your browser. ✦ Dark Mode & 12 Languages Choose light or dark mode. The interface follows your browser language: English, 简体中文, Español, Português, 日本語, Deutsch, Français, 한국어, Русский, Indonesia, Tiếng Việt, and हिन्दी. 【WHO IS IT FOR?】 • Photographers: compare original vs. edited or compressed photos and check image quality before publishing. • Designers & developers: run visual image diff checks on design revisions, screenshots, UI changes, pixel shifts, and rendering issues. • Video editors & engineers: compare codecs, bitrates, CRF settings, resolutions, and encoder outputs on synchronized frames. • AI creators: evaluate before/after results from AI image upscalers, enhancers, restoration tools, generative models, and super-resolution workflows. • Anyone optimizing images: compare PNG, JPEG, and WebP exports to balance visual quality and file size. --- No uploads. No sign-up. Just clearer image and video quality comparisons. Questions or feedback? Use the email button on the extension page.