The Image Compressor and Resizer processes an uploaded image in the browser, changes dimensions, and exports a selected format and quality setting.
Compression trade-offs
Reducing dimensions usually reduces file size substantially. Lower quality can reduce size further but may introduce visible artifacts. PNG, JPEG, and WebP behave differently depending on transparency and image content.
Frequently Asked Questions
Does compression always reduce quality?
Lossy formats (like JPEG) reduce visual quality to achieve smaller file sizes; lossless workflows (like PNG optimization) preserve quality but may result in less significant size reductions.
Are images uploaded to a server?
No. The tool processes files entirely within your local browser memory using HTML5 Canvas APIs. No images are uploaded to a remote server.
Why can a resized image still be large?
Complex images with high detail, high-quality settings, transparency channels, and certain format choices can prevent significant file size reduction, even when pixel dimensions are smaller.
Limitations
The tool does not guarantee an exact target file size in bytes, preserve all EXIF metadata during format conversion, or replace professional batch-processing pipelines.