How to use this image tool
Reduce image file size with browser-side lossy compression and a clear before/after comparison.
How the browser processing works
- Loads the image locally in your browser.
- Re-encodes it with a quality setting that balances clarity and file size.
- Shows the compressed size and percentage saved before download.
Formula
Compressed output = original pixels re-encoded with selected quality.
Example
A photo can often be reduced for email or web use by lowering JPEG or WebP quality.
Using your output
Use the compressed file when a smaller file matters more than preserving every detail. Review the preview before downloading.
Assumptions and limitations
- Compression is lossy and may introduce visible artifacts.
- Images are not uploaded to Tool2Do.
Frequently asked questions
Is compression lossless?
No. This tool uses lossy browser encoding to reduce file size.
Why did my file get larger?
Some images are already compressed. Re-encoding can occasionally create a larger file depending on format and settings.