Compare two photos online
Put two photos against each other and see what changed: with a slider, side by side, faded together or with the differences highlighted.
No sign-upYour photos never leave your deviceJPG, PNG and WebP
You can drop both photos at once. Nothing is uploaded.
What changed between the two photos, in amber.
AI-generated images
How to compare two photos
Pick both photos
Drop the before and after photos into their slots, or both at once. No photos at hand? Try the sample.
Slide
Drag the line in the middle or use the arrow keys to reveal one photo over the other.
Switch views
Side by side to see both in full, fade for subtle changes and differences to make what moved stand out.
Fix the order
Swap before and after in one click, or load another pair without reloading the page.
Free or with VisionHub
The free tool is for two photos you already have. With VisionHub the photos are taken by the site cameras and the comparison is always at hand.
Free photo comparison
- Two photos at a time, in JPG, PNG or WebP
- Before/after slider, with mouse, finger or keyboard
- Side by side, fade with opacity and difference map
- Swap the order and load another pair instantly
- Nothing is uploaded or saved: close the tab and the photos are gone
With VisionHub
- Photos taken by fixed site cameras, always from the same viewpoint
- Any camera in the project, with its full capture history
- Any two moments, filtering by date and time across thousands of photos
- Side by side with a slider, or overlaid to see small changes
- Real camera images, with no edits, to back up your reports
- Automatic time-lapses and a gallery shared with the whole team
Your photos never leave the browser
The tool works with the photos on your own device. There is no upload to VisionHub or third-party servers: the images are not sent, not stored, and are gone when you close the tab. You can check it yourself: load two photos, go offline, and it keeps working.
That matters when the photos are of a client’s site, an inspection or a report that is not public yet.
How to take photos that compare well
A comparison only shows the change if everything else stays still. Take both photos from the same spot, with the same framing and focal length: one step aside or a different zoom makes half a building look like it moved. If you can, mark where you stand or always use the same tripod.
Keep reading
Light matters as much as framing. At the same time of day shadows fall the same way, and the difference mode marks what changed in the scene, not in the sky. With an overcast day against a sunny one, fade usually reads better than differences.
On a construction site, the hard part is repeating it for months. That is why progress is tracked with fixed cameras: the viewpoint never changes and there is a photo for every hour of the day. With VisionHub those captures are compared by date and time without downloading them one by one.
Photo comparison FAQ
Is the photo comparison tool free?
Yes. It is free, requires no sign-up and has no usage limit. VisionHub publishes it as an open tool, like the IFC viewer.
Are my photos uploaded to a server?
No. The photos are read in your browser and are not sent to VisionHub or third parties. They are not stored and are gone when you close the tab.
What does the difference mode do?
It compares both photos pixel by pixel and paints what changed in amber over a grey copy of the after photo. It works best with photos taken from the same spot in similar light.
Can the two photos have different sizes?
Yes. The after photo is fitted to the framing of the before photo without stretching it. If the viewpoint or zoom differ, the slider and fade still work, but the difference map will flag almost everything as changed.
Does it work on mobile?
Yes, in any modern browser. Drag the slider with your finger and pick the photos straight from your phone’s gallery.
How is this different from VisionHub photo comparison?
Here you compare two photos you already have. In VisionHub the photos are taken by the fixed site cameras: you pick the camera and any two moments from its history, filtering by date and time, and compare them with a slider or overlaid, without downloading anything.