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Compress Image
Compression re-encodes your image at a lower quality setting so it takes fewer bytes to store and send. You choose the quality; the tool shows you the resulting size before you commit to downloading it.
- Free
- No signup
- Private · runs locally
How to compress an image
- Drop a JPG, PNG or WebP file onto the upload area, or click to choose one.
- Pick an output format and drag the quality slider. Lower quality means a smaller file.
- Press “Compress image” and check the size comparison that appears.
- If the result is too soft, raise the quality and compress again. When you are happy, download it.
How much can you realistically save?
A photograph straight from a phone camera can usually be reduced by 60–80% before anyone would notice on a screen. Screenshots and flat graphics compress much less, because the detail that lossy compression discards is exactly the sharp edges those images are made of.
If a file is already compressed - a small JPG pulled from a website, for example - there is very little left to remove. Compressing it again mostly degrades quality rather than saving space. When a tool promises a huge reduction on an already-optimized file, it is usually resizing it rather than compressing it.
When the file size still isn't small enough, reducing the pixel dimensions has a far bigger effect than turning the quality down further. Halving the width and height removes roughly 75% of the pixels.
Frequently asked questions
Which format should I compress to?
WebP gives the smallest files and is the best choice for a website. JPG is the most compatible option for sharing and uploads. PNG is lossless, so compressing to PNG only helps if the source had more color data than the image actually needs.
What quality setting should I use?
Start at 80%. For photographs, anything from 75% to 90% is normally indistinguishable from the original at screen size. Below about 60% you begin to see blockiness in skies and smooth gradients.
Does compressing change the image dimensions?
No. The width and height stay exactly the same. Use the image resizer if you want fewer pixels as well as fewer bytes.
Is my photo uploaded anywhere?
No. Compression runs in your browser with the Canvas API, so the image stays on your device from start to finish.
