Can the two images be different sizes?

Yes. In the slider the second image is stretched to the first one's frame; side-by-side and stacked exports scale them to a common height or width.

Is the exported image sharp?

It is composed at the original resolution and saved as PNG, with no extra compression.

Are my files or data uploaded?

No. Everything runs locally in your browser with no network upload, and is discarded when you close the page.

Do I need to sign up or pay?

No. The site is completely free, needs no account and has no usage limits.

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↔️Compare Two Images Online - Before/After Slider & Comparison Maker

Lay two images on top of each other and drag the divider to compare them pixel by pixel — ideal for checking retouching, compression, colour grading or AI processing. When you are happy, export a comparison: side by side, stacked, or merged at the current divider position, with optional Before / After labels for social posts, tutorials or client reviews. Everything runs locally and images are never uploaded.

Free · No sign-up · Runs in your browserLast updated: 2026-10-26

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How to use Compare Images

1Drop in two images (the first is before, the second is after)
2Drag the divider to see the differences
3Pick an export layout and labels, then click Export comparison

FAQ

Can the two images be different sizes?: Yes. In the slider the second image is stretched to the first one's frame; side-by-side and stacked exports scale them to a common height or width.
Is the exported image sharp?: It is composed at the original resolution and saved as PNG, with no extra compression.
Are my files or data uploaded?: No. Everything runs locally in your browser with no network upload, and is discarded when you close the page.
Do I need to sign up or pay?: No. The site is completely free, needs no account and has no usage limits.