Image Compare
Compare two pictures: drop the first, add the second, then drag the before/after slider, or view them side by side, fade between them, or highlight every difference.
or browse filesdrop two images here or paste
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Compare two pictures: drop the first, add the second, then drag the before/after slider, or view them side by side, fade between them, or highlight every difference.
or browse filesdrop two images here or paste
Similarity is the average colour distance over every pixel both pictures share; changed pixels are those past the Difference view's sensitivity.
Drag the divider on the picture, or use the arrow keys.
Changed pixels are painted red over a dimmed copy of image 1. Lower the sensitivity to ignore compression noise.
Image 1 sets the size. Fill crops image 2 to it, Fit shows all of image 2 with bars, Stretch resizes it to match.
This free image compare tool puts two pictures on one screen and lets you look at them the way the question demands. Drop the first image, add the second, and a before/after slider appears: drag the divider across the photo and image 2 is revealed on one side of it, image 1 on the other, so an edit, a retouch, a compression setting or a camera setting can be judged on the same pixels. Switch the view to side by side for two whole pictures next to each other, to Fade for an opacity blend that makes small shifts jump out, or to Difference, which paints every changed pixel red and scores how similar the two really are.
The slider is the classic way to compare a photo before and after an edit, and it stays interactive here rather than being baked into a file. The divider runs left/right or top/bottom, the arrow keys move it one percent at a time for a precise look at an edge, and the Before and After labels can be renamed or switched off. When you want to keep the comparison, the download button saves it as one image with the divider exactly where you left it, ready for a portfolio, a tutorial or a client message.
Side by side scales the second picture to the height of the first and sets them next to each other (or stacks them), which is the view for a compare-and-contrast of two different photos of the same subject, two camera phones, or two versions of a thumbnail - a comparative look with no software to install. Fade lays image 2 over image 1 with an opacity slider, so a colour cast, a crop shift or a small object that moved shows as a ghost. Difference is for spotting changes you cannot see: it compares the two pictures pixel by pixel, dims everything that stayed the same and paints what changed in red, with a sensitivity control to ignore compression noise. The details card on the picture reports the similarity as a percentage along with the share of pixels that changed, which answers "are these two files the same image" in one number.
The first picture sets the size of the result and the second is fitted to it: Fill covers the frame edge to edge, Fit shows the whole second picture inside it, and Stretch matches it exactly when only the proportions differ. Swap hands the frame to the other picture with one click. JPG, PNG, WebP, GIF, BMP and any other format your browser can open work as input, and the saved comparison comes out as PNG, JPG or WebP, or goes straight to the clipboard. For blending two pictures into one composite rather than comparing them, the Image Blender is the tool.
Both pictures stay on your device. The slider, the difference map, the similarity score and the saved image are all computed in your browser, so unreleased designs, medical scans, legal evidence and personal photos can be compared without uploading anything anywhere, and there is no signup, no watermark and no file size limit beyond your own memory.
Open the first image, add the second, and choose Side by side in the View row. Both pictures appear at the same height next to each other, or stacked if you pick that split, and the download button saves them as one combined image.
The slider is the default view: drop the two pictures and drag the divider on the image. Left/right or top/bottom splits, editable Before and After labels, and the saved image keeps the divider where you set it.
Yes. Choose Difference and every pixel that differs is painted red over a dimmed copy of the first picture; the details card gives a similarity percentage and the share of changed pixels. Two identical files score 100% with nothing red; a re-saved JPG scores just under that with scattered noise, which the sensitivity slider hides.
The first picture sets the size and the second is fitted to it. Fill covers the whole frame, Fit keeps the entire second picture visible with bars, and Stretch resizes it to match exactly. Swap makes the other picture the reference.
Yes. Load the original and the compressed copy, zoom in with the fullscreen button and drag the slider across fine detail, or switch to Difference to see exactly where compression changed pixels and by how much.
No. Both files are read and compared entirely in your browser; nothing is sent to a server, which is why the tool is safe for confidential or personal pictures.