How to use Image Compressor
Compress photos to a target KB size with batch previews.
- Select JPEG, PNG, or WebP files. Choose a target size and maximum width, then process the batch. If the target cannot be reached, reduce the dimensions or accept the smallest available result.
- Process the selected files, then inspect the preview, dimensions or warnings.
- Download a new copy and check it before replacing or sharing the original.
How processing works
Images are decoded to browser pixels and re-encoded at candidate quality settings. A target KB limit is a goal rather than a fixed compression ratio. Smaller dimensions reduce the pixels the encoder must store.
A quick example
A 2 MB photo may need both resizing and lower JPEG quality to meet a 100 KB limit.
Assumptions, edge cases & limits
- A detailed photograph may not meet a very small KB target at its original dimensions.
- Repeated lossy compression compounds quality loss; start each attempt from the original.
- Compression can reduce visible detail. Always keep your originals.
Questions about Image Compressor
Why is my photo still above 100 KB after compression?
Image detail, dimensions and the output format determine the smallest usable result. Reduce maximum width, try a lossy format and inspect the preview. A target size cannot be guaranteed for every input.
Will compressing a PNG always make it smaller?
No. Re-encoding can increase an already efficient file. Photographs often compress better as JPEG or WebP, while logos may need PNG or WebP transparency. Compare the output size and appearance.
Are my files or inputs uploaded?
Calculation and file processing run in your browser without a processing upload. Downloads go to your device. Choosing a next-step transfer creates a temporary local copy for that workflow. Region preferences are stored separately from tool inputs. See our privacy details.
Can I use this tool for free?
Yes. No signup, subscription or payment is required to use the tool or download its output. File tools have device and size limits; a smaller batch may work better on a phone.
A result or explanation needs correcting? Tell us the tool name and an example.