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Compression Analyzer
Compare two images and see the dimension, byte and bits per pixel difference.
Compare two images
First: not loaded
Second: not loaded
Size change: —
Bits per pixel: —
How to use the Compression Analyzer
- Choose the original image as the first file.
- Choose the compressed or exported version as the second file.
- Compare the byte saving and the bits per pixel figures in the table.
Features
- Compares dimensions, bytes and file types side by side
- Calculates bits per pixel for both images
- Reports the exact saving in bytes and percent
- Flags when the second file grew instead of shrinking
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Frequently Asked Questions
Common questions about the free online compression analyzer.
Choose the original as the first file and the export as the second, and the tool reports the
exact byte difference and percentage.
It is the file size in bits divided by the pixel count, so a lower figure means the image is
compressed harder.
It lets you compare compression fairly even when the two images have different dimensions.
A typical photo saved at quality 80 is roughly ten times smaller than the raw pixel data it
started from.
No. Both files are measured exactly as they are, so the figures reflect the real stored data.
No. Both files are read in memory in your browser and nothing is transmitted.
Re-saving an already compressed photo, or exporting at a higher quality, often produces a
larger file.
Not in one pass, but you can load a new pair at any time to compare another set of images.
Yes. The analyzer is fully responsive and works in the browser on phones, tablets and
desktops.
Last updated: October 10, 2026