Before
Upload "before" image
After
Upload "after" image
BEFORE
AFTER
Need more control? Pinch-to-zoom, custom labels, top/bottom mode, and more.
Open Full Editor → Effects → Before/After Tool
A before and after image comparison lets you visually compare two images side by side using an interactive slider.
Drag the slider to reveal either image. Works on touch devices too.
Compare your images instantly using the slider tool.
Compare Images Now (Free)A side-by-side slider shines for any visual change where the difference matters. Three of the most common use cases creators bring here:
Photo editing
Drop the original next to your edited version to verify the color grade, retouch, or crop actually improved the shot. Easier than flipping layers back and forth in an editor.
Weight loss or fitness transformation
A slider reveals progress far more clearly than two photos posted separately. Match the framing and lighting of both shots for a fair comparison.
Design comparison
Compare draft vs. final, A vs. B thumbnail concepts, or old vs. redesigned graphics. Pair with the thumbnail analyzer to score each version.
An image comparison tool lets you see changes, edits, or improvements clearly instead of guessing what changed. Common jobs:
Comparing images of different sizes
Images should share the same dimensions for the clearest comparison. Use the 1280x720 converter to standardize both images first.
Using low-quality versions
Poor image quality makes differences harder to judge. Start with high-resolution source images.
Changing too many things at once
If too many edits happen between versions, it becomes harder to isolate what actually improved.
Not checking at smaller sizes
Some changes only matter when the image is viewed smaller, especially for thumbnails. Preview at YouTube sizes to verify.
Comparing without a clear goal
Know what you are evaluating, clarity, contrast, cropping, or overall visual impact.
A small thumbnail change can make a big difference in click-through rate. A before and after comparison lets you test changes like text placement, contrast improvements, red circles or highlights, crop adjustments, and visual cleanup.
After picking your best version, use the thumbnail analyzer to check its click potential, then make sure it is 1280x720 pixels and under 2MB.
Make both images match in size and quality before comparing.