Compress Image: Reduce File Size Online Free
Reduce image file size without losing quality. Compress JPG, PNG, and WebP images entirely in your browser. No uploads, no servers.
About this tool
Compressing an image reduces its file size by re-encoding it at a lower quality or in a more efficient format. Smaller files load faster on websites, attach cleanly to emails, and fit inside upload limits, all without changing the pixel dimensions of the picture.
This compressor runs entirely in your browser. Your photos are processed on your own device with the Canvas API and are never uploaded to a server, so even sensitive images stay private.
How to use it
- 1
Upload your image
Drag and drop a JPG, PNG, or WebP file, or click to browse from your device.
- 2
Choose quality and format
Drag the quality slider and pick JPG or WebP. Lower quality means a smaller file; WebP usually wins on size.
- 3
Download the result
Preview the compressed image and the size saved, then download your optimized file.
Frequently asked questions
How do I reduce the file size of a photo without losing quality?
Start around 80% quality. Most photos look identical to the original at that setting while becoming significantly smaller. Lower the slider further only if you need an even smaller file, checking the preview as you go.
How can I compress an image to a specific size, like under 100 KB or 1 MB?
Lower the quality slider and watch the result size shown after compressing. Reduce it step by step until the output drops below your target. Switching the output format to WebP also helps you hit small targets while keeping the image sharp.
Does compressing reduce the image dimensions?
No. Compression keeps the same width and height and only reduces file size. If you also need fewer pixels, use the Resize Image tool first, then compress.
Is JPG or WebP better for compression?
WebP typically produces a smaller file than JPG at the same visual quality, and it supports transparency. JPG is the safer choice when you need maximum compatibility with older software.
Are my images uploaded anywhere?
No. Everything happens locally in your browser. Your files never leave your device, so the tool works even offline once the page has loaded.