Load an image to begin.
This image compressor re-encodes a picture at a lower quality setting so the file gets smaller. The quality slider starts at 80, which is the usual sweet spot for photographs: most people cannot tell it apart from the original at normal viewing size, yet the file often drops by half or more. Every change to the slider triggers a fresh encode after a short pause, so you can watch the size and the preview react instead of guessing.
You can keep the original format or convert to JPEG or WebP. WebP typically lands 25 to 35 percent smaller than JPEG at comparable visual quality, which makes it the better choice for web pages when you do not need older browser support. An optional maximum width caps oversized photos before encoding, which usually saves more bytes than the slider alone. PNG output ignores quality because PNG compression is lossless.
How to use the Image Compressor
- Choose an image or drop one onto the drop area. A first pass at quality 80 runs automatically.
- Drag the quality slider and watch the compressed size and the after preview update live.
- Optionally set an output format and a maximum width to shrink large photos before they are encoded.
- Compare the before and after previews, then press Download compressed to save the smaller file.
Frequently asked questions
Are my images uploaded for compression?
No. The image is decoded, drawn to a canvas and re-encoded entirely inside your browser. No bytes are sent to any server and nothing is stored. The tool keeps working even if you go offline after the page has loaded.
What happens to a transparent PNG if I output JPEG?
JPEG has no alpha channel, so transparency cannot survive. This tool fills the canvas with white before drawing, which means transparent areas become solid white rather than black noise. Keep PNG or choose WebP if you need to preserve transparency.
Why did my file get bigger instead of smaller?
That happens when the source was already saved at a lower quality than the one you selected. Re-encoding cannot recover the discarded detail, but it can spend more bytes describing the compression artefacts. Lower the slider, or keep the original file.
Is JPEG or WebP better for the web?
WebP is usually 25 to 35 percent smaller than JPEG at similar perceived quality and it supports transparency. All current major browsers decode it. JPEG remains the safer choice for email clients, older software and anything that needs maximum compatibility.