Are the two images required to be the same size?

No. The canvas uses the larger dimensions of both and stretches each image to fit. For best results use identical dimensions and alignment.

Can I export an interactive slider for embedding?

No — this tool exports a static PNG snapshot. To embed an interactive slider, use the exported image plus a JS library on your own site.

It's a visual handle on the split line, mimicking the look of common before/after widgets. It's baked into the exported PNG.

No. Composition runs entirely in your browser.

Build before/after comparison images with an adjustable slider.

100% private — no uploads Image ToolsFree & unlimited Read tutorial

Follow these steps — everything happens instantly in your browser.

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Step 1. Drop your “before” image in the left zone and the “after” image in the right zone.
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Step 2. Drag the slider position to set the split point.
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Step 3. Click “Download comparison PNG” to export the composed image.

Everything you might want to know about image comparison slider.

Apply grayscale, sepia, blur, brightness & more with live preview.

Drag a crop rectangle to crop your image to the perfect frame — free or locked to an aspect ratio.

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All-in-one photo editor: brightness, contrast, saturation & 7 presets.