Compare Images Online
Compare two images side by side — dimensions, sizes and a byte-identical check, in your browser.
Compare Images Online is a browser-based image tool on ImgToolsBase. Compare two images side by side — dimensions, sizes and a byte-identical check, in your browser. To use it, upload or drop your image and view the result directly in your browser — no signup and nothing to install.
How this tool works
What it does
Shows two images side by side with dimensions, sizes, aspect ratios and a byte-identical SHA-256 check.
Two pickers
Load one image per picker, or two in the first picker; Process enables when two are present.
Scope
Side-by-side comparison only — not a per-pixel visual diff.
Privacy
Images are read on this page; nothing is uploaded and originals are not modified.
Compare Images Online in your browser
Compare Images Online places two images next to each other and reports each one's dimensions, file size, MIME type, aspect ratio and a SHA-256 of the raw bytes, so you can see at a glance how they differ. It is a side-by-side comparison, not a pixel-level visual diff.
Upload one image in each picker, or select two images in the first picker. The tool tells you whether the two files have the same dimensions and whether they are byte-identical, and reports the difference in total pixel count.
The two images are decoded only to read their size; the original files are never modified or uploaded, and the downloadable report is a plain-text summary.
How to use Compare Images Online
- Add the first image to Compare Images Online using the left picker (click, press Enter, or drag a file in).
- Add the second image using the right picker, or select two images at once in the left picker.
- Click Process to compare the two images side by side.
- Review the dimensions, sizes and byte-identical check, then download the text report.
Why use Compare Images Online
One picker for each image, both with drag-and-drop and keyboard support, so the workflow is unambiguous.
A SHA-256 of each file tells you whether the two are exactly the same bytes, not just visually similar.
Labelled as a side-by-side comparison — no hidden, unreliable visual-diff claims.
Both images are read on this page; nothing is uploaded and the originals are untouched.
Common uses for Compare Images Online
See how an edited or exported copy compares in dimensions and file size.
Confirm whether two files are byte-identical with the SHA-256 check.
Compare two assets' aspect ratios and pixel counts side by side.
Produce a quick text report when sending images to a client or teammate.
Frequently asked questions
Does Compare Images Online calculate pixel differences?
Not in this version. It shows the two images side by side with their dimensions, sizes, aspect ratios and a byte-identical check. It does not yet compute a per-pixel diff, SSIM or PSNR overlay.
How do I load two images into Compare Images Online?
Use both pickers — one image on the left and one on the right — or select two images together in the left picker. Process stays disabled until two images are loaded.
Can Compare Images Online tell if two files are identical?
Yes. It computes a SHA-256 of each file's raw bytes and reports whether they are byte-identical, as well as whether they share the same pixel dimensions.
Are my images uploaded when I compare them?
No. Both images are decoded by browser APIs on this page only to read their size; no file is sent to a server, and the originals are not modified.
What does the downloaded comparison contain?
A plain-text report listing each image's name, dimensions, aspect ratio, file size, MIME type and SHA-256, plus the same-dimensions and byte-identical results.
Related image tools
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