Image Compare & Before / After Slider

Yes. Drag horizontally across the preview in slider or overlay mode. The range control supports arrow keys plus Home and End. Side-by-side view does not use a divider position.

It draws the second image over the first with your selected opacity. It is a visual overlay, not a mathematical difference map.

The frame aspect ratio follows the first image. Whole-image fitting preserves each image’s proportions and can leave transparent space; fill mode center-crops. Swap images to change the frame reference.

No. Images are resized for a visual comparison; no pixel-equality score, file equality test or forensic analysis is provided. Use File Checksum Calculator for comparing file hashes.

Each image can be up to 20 MiB, 8 million pixels and 16,000 pixels per edge. Output width is 320–3,200 pixels, with a total output limit of 8 million pixels. Side-by-side output rounds odd widths down to keep equal panels.

A still PNG or JPG image with the selected comparison view, position and optional labels. It does not export an interactive website slider. PNG keeps transparent areas; JPG fills them white at 92% quality.

Supported animated WebP or PNG uses a single decoded frame. This tool compares still images and does not synchronize animation.

No processing upload or saved image history is used. Images stay in browser memory and local downloads. Clear images releases them; website ads and analytics follow the privacy information.