Compare two images side by side with a slider
Load any two supported images and drag a slider across them to spot differences. File size, dimensions and type are listed for each, so you can judge what a conversion cost.
Drop images here, or pick them from your device
Stays on your device. Nothing is uploaded.
Processing on this device
How to use it
- Load the first image, then the second. HEIC, JPG and other common formats work.
- Drag the slider across the picture to compare.
- Zoom in on areas such as skies, edges and text.
- Read the stats: size, dimensions and type.
What it keeps
- Both files, which are only read.
What it removes or changes
- Nothing changes. It is a viewer.
Limits
- Looking is subjective. Zoomed-in comparison shows differences a normal view hides.
- The tool does not compute a quality score.
- Pixel dimensions must match for a meaningful overlay.
Compatibility
Useful for checking a conversion at different quality settings, comparing a compressed file with its source, or deciding whether a smaller version looks acceptable. Any two supported images can be compared.
Privacy
Both images are decoded in your browser. They are not uploaded.
What to look for in a HEIC vs JPG comparison
Check smooth gradients for banding, fine textures such as foliage and hair for smearing, edges and text for ringing, and colour for shifts. Compare file sizes too: the question is not which is perfect, but whether the saving is worth any visible cost.
Troubleshooting
The images are misaligned.
They have different dimensions or orientation. Convert them with the same settings.
I see no difference.
Zoom in. At high quality, differences are small, which is the point.
The sizes surprise me.
HEIC is typically compact, while JPG of the same look is often larger.
Frequently asked questions
Can I compare two JPGs?
Yes. Any two supported images.
Does it rate quality?
No. It shows size, dimensions and type.
Are my images uploaded?
No. Both images are decoded and compared inside your browser, and nothing is sent to a server.