Image Compressor
Reduce an image's file size by re-encoding it at a quality level you control.
Upload an image
Drag & drop files here, or
Files are processed securely in your browser
How It Works
- 1Upload an image.
- 2Adjust the quality slider and preview the trade-off.
- 3Click Compress Image.
- 4Download the smaller file.
Features
- Live quality control
- Shows before/after file size
- Keeps original dimensions
Privacy
This tool runs entirely in your browser using the Canvas API — your image is never uploaded to a server.
About Image Compressor
Most photo compression is lossy: the encoder groups similar pixel values, discards detail the human eye is less sensitive to, and rebuilds an approximation of the original when the file is opened. JPG does this through discrete cosine transform blocks and chroma subsampling, which is why dragging the quality slider down mainly softens fine texture and introduces blocky artifacts around hard edges before it visibly changes colors. PNG, by contrast, is lossless, so this tool mostly gains ground on PNG files by optimizing the compression pass itself rather than throwing away pixel data.
The right quality setting depends on what the image is for. A hero banner or product photo usually tolerates quality settings in the 60-80 range with no visible difference at normal viewing sizes, while a technical diagram or screenshot with sharp text can start showing halos and smudging much sooner because compression artifacts are more obvious around straight lines than in organic photo textures.
This is a one-way trade: once detail is discarded during a lossy pass, re-compressing at a higher quality later cannot restore it. Keep an original copy of anything you might need to re-edit, and treat the compressed output as a distribution copy for web pages, email attachments or messaging apps where smaller files load faster and use less bandwidth.