Image Size Reduction Calculator
Calculate how much an image must shrink to hit a target file size. See the required reduction percentage and bytes saved.
This is a mathematical estimate. Actual encoded image size depends on image content, dimensions, format and encoder behavior.
Why use this tool?
- ✓ current size
- ✓ target size
- ✓ reduction percentage
- ✓ bytes saved
- ✓ KB/MB support
- ✓ clear next action
Common use cases
- • planning upload targets
- • estimating storage savings
- • choosing compression targets
- • web asset planning
How to use image size reduction calculator
Choose your image
Start with the original file whenever possible.
Set the goal
Use a quality, percentage, destination or upload-size setting.
Process locally
The image is processed in your browser.
Review and download
Compare the result and keep the original as your master copy.
Frequently asked questions
Are my images uploaded?
No. These image workflows process the selected file in your browser during the session.
Can I keep the original image?
Yes. The tools create an optimized copy; keep the original as your master file.
Does the calculation guarantee the encoded result?
No. It tells you the mathematical reduction required; actual encoded size depends on the image and format.
Can I calculate 50%?
Yes. Enter the current size and either a target size or reduction goal.
Continue your image workflow
After optimizing an image, use the next tool that matches the actual destination instead of processing the same file repeatedly.
Privacy and file quality
Keep the original image as your master copy. Compression is a trade-off between file weight, dimensions, format and visual detail. MAXScanner shows the resulting file size so you can make that choice from the actual output rather than an estimate.