KordFree diff tool
Compare two images
Diff two images in your browser, free, no account: put two revisions of a diagram, plot, or scan against each other and see the differences you cannot catch by eye. Built by Kord; opens with a sample block-diagram pair loaded.
Free, no account. Opens with a two-revision block diagram loaded.
Two PNGs of the same block diagram, exported a month apart. They look identical, which is exactly the problem - the change you are looking for is one relabeled box, and human eyes are famously bad at this game.
Drop both images here and let the comparison find it. Works for exported diagrams, plots out of a simulation, screenshots of an HMI, and scans - anywhere the drawing tool is long gone and the pixels are what you have.
What the comparison shows
What you get on screen once both files are in, and why each piece is there:
- Differences you cannot eyeball. The comparison shows where the two images disagree, at pixel precision, instead of relying on your attention span.
- Side by side, together. Zoom and pan move both images at once, so you inspect the same region of both.
- For the files that are only pixels. Scanned drawings and exported plots have no source file to diff. This is the diff they get.
How to compare two images
Three steps, none of which is signing up:
- Open the diff tool - it loads with a two-revision block diagram already compared, so you see the result shape before committing your own files.
- Drop your two images into the Before and After slots - up to 25 MB each.
- Read the comparison. If someone else needs to see it, Share turns it into a link.
FAQ
The questions people ask before dropping real files on a free tool, answered plainly:
Is it free?
Yes. No account, no trial clock, no watermark. The tool exists because we build Kord, version control for engineering document sets, and a diff you can run in ten seconds explains the product faster than any brochure.
Do my images get stored?
Files are kept only as long as it takes to draw the comparison. Most formats render in your browser; Word and PowerPoint are converted to a preview by our servers in memory, and a file too big to ride a request travels through a short-lived upload that is deleted automatically. There is no account, so there is no history to attach anything to. The longer answer is at work.withkord.com/security.
What image formats work?
PNG is the sample pair; common raster formats work the same way. For diagrams that exist as SVG, the SVG comparison keeps them sharp at any zoom.
When two files aren't the real problem
A one-off diff answers a one-off question. If your team compares images every revision cycle - and the revision that matters sits next to drawings, specs, and calc sheets that have to agree with it - that is the job Kord exists for: version control on the whole document set, this same visual comparison between any two revisions, and review sessions with sign-off before anything is issued. The longer argument is in Git for documents.
Compare other formats
The same tool reads eleven formats - the full list is on the compare index. Nearby: Compare two SVG files · Compare two PDF files · Compare two PowerPoint files.