Private browser image workflow
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
Plan the reduction before compressing
A reduction calculator answers the mathematical question first: how many bytes or what percentage must be removed to reach the target. The encoded result still depends on image detail, dimensions and format.
Use the calculation to choose a sensible compression target, then verify the actual file produced by the compressor.
- Keep MB and KB units explicit.
- A 50% byte reduction is not the same as reducing pixel dimensions by 50%.
- Use an exact-target compressor when a portal has a hard byte limit.
How to use image size reduction calculator
Choose your image
Start with the original file whenever possible.
Set the real goal
Use the actual quality, percentage, destination or upload rule.
Process locally
The selected image is processed or inspected in your browser.
Review and download
Compare the measurable 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
Choose the next tool because the destination requires it, not because every image needs every optimization step.
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 measurable result so you can make that choice from the output rather than a marketing score.