How image comparison with a slider works
This image comparison tool stacks your two images in the same frame. Image B lies on top of Image A, and the divider decides where Image B stops. Drag it right and you see more of Image B; drag it left and Image A takes over. Moving it slowly across a detail (an edge, a face, some text) is the fastest way to see a difference your eyes miss when switching between two windows.
The frame takes its shape from the first image you load, and both images are fitted inside it without cropping. For a pixel-perfect comparison, use two images with the same dimensions, such as an original and its edited export. When you load new versions, the reset button clears both slots so you can start a fresh comparison straight away.
Compare 2 images side by side vs with a slider
Side-by-side comparisons are good for seeing two different scenes or products together. For two versions of the same image, a slider is better: both versions occupy the same position, so the eye only notices what changed. If you need a shareable side-by-side picture, make one with the Photo Grid Maker's 2 Grid layout, which puts both images next to each other in one JPG.
| Method | Best for | In PicX |
|---|---|---|
| Slider overlay | Two versions of the same image | Image Comparison Tool |
| Side by side image | Sharing a comparison | Photo Grid Maker (2 Grid) |
| Flipping between files | Quick checks | Not recommended |
What to look for when you compare images
Different jobs call for different checks. Move the slider slowly over the areas that tend to show problems.
Zoom your browser in (Ctrl or Cmd and plus) to inspect fine detail; both images scale together, so the comparison stays aligned at any zoom level.
- Compression: smooth gradients like sky and skin, where banding and blocks appear first.
- Sharpening and upscaling: edges and fine text, where halos and artifacts show.
- Color edits: whites and skin tones, which reveal a color cast.
- Retouching: the edges of anything that was removed or cloned.
