Reduce storage without resizing
Image compression changes how image data is encoded so the file can take up less space. JPG and WebP quality controls trade a little visual detail for a smaller file, while the image dimensions stay unchanged.
Image tool
Image Compressor
Make JPG, PNG, and WebP images smaller without uploading them.
Compress your image
Choose, tune, and compare
- Select or drop one supported image.
- Choose a quality for JPG or WebP. PNG uses an honest lossless attempt.
- Compress, compare the before-and-after sizes, and download the useful result.
Compression by format
Lossy quality compression is effective for photographs and keeps the original dimensions.
Lossless browser re-encoding may offer limited savings. ToolNest reports honestly when it does not.
Lossy quality compression can reduce size while retaining supported transparency.
PNG limitations
Why PNG works differently
Browsers do not expose a reliable PNG quality control through canvas. This tool keeps PNG output as PNG and attempts a lossless re-encode. It never silently converts your file or claims savings when the result is larger. For a substantially smaller copy, you can deliberately convert the image to WebP with Image Converter.
Helpful answers
Image Compressor FAQs
Are my images uploaded?
No. Compression runs locally in your browser, so your image never leaves your device.
Will compression change my image dimensions?
No. Image Compressor keeps the original width and height. It changes encoding quality for JPG and WebP, or attempts a lossless re-encode for PNG.
Why is PNG compression limited?
Browser canvas exports PNG losslessly and does not provide a dependable PNG quality setting. ToolNest never pretends the quality slider can shrink PNG files.
What if the result is larger?
ToolNest reports that no useful reduction was achieved, shows the size difference, and keeps the original image available to download.
Which quality should I choose?
Around 75% is a practical starting point. Lower settings usually create smaller files, while higher settings preserve more visual detail.