Need to compress images and folders in bulk?
WinZip can help.
Password-protect files. Zip up folders. See what else WinZip can do for you.
Pick a purpose to get sensible defaults, or set your own.
Nothing generated here ever leaves your browser.
Drop images here or click to upload
JPG, PNG, WebP -- up to 10MB each
Password-protect files. Zip up folders. See what else WinZip can do for you.
Pick one above, or use this as a reference for what to set manually. These are estimates for a reasonably high-quality source image, not a guarantee.
| Purpose | Quality | Typical result |
|---|---|---|
| 70% | A 3MB photo → around 400KB | |
| Social media | 80% | A 3MB photo → around 700KB |
| Website | 60% | A 3MB photo → around 250KB |
Every site, email provider, and social media platform has different requirements for the images you upload. But what actually happens when you compress an image to use online?
Rather than taking away the core of an image, compression simplifies color and reduces detail in subtle ways that a viewer likely won’t see. This shrinks the file without an obvious drop in quality.
Once you compress an image, the changes are permanent. That detail is gone and can’t be recovered. So while higher levels of compression are good for quick previews, they won’t work well for things that need printing.
JPG and WebP files compress by simplifying detail and color. When you’re compressing with the WinZip image compressor tool, you can control how much gets removed with the quality setting. PNGs, on the other hand, are designed to shrink without losing detail—so the end result depends on the starting image.
No. Image compression happens entirely in your browser and doesn’t rely on servers at all. Your images never leave your device.
How much detail an image loses depends on both the quality setting and the image itself.
Higher quality settings will keep more detail, which means a larger file size. Lower quality settings will shrink the file size farther, but can cause the image to look soft or blocky.
The before/after preview shows you what your image will look like at different settings so you can see your image’s quality before you download anything.
The PNG file type reproduces images exactly, so when it compresses, it doesn’t lose detail. How much the file shrinks depends on the image itself. A screenshot or flat-color graphic can shrink drastically, but a photo saved as a PNG often won’t shrink as much.
Yes. When you choose a purpose, that’s a starting point, not necessarily your final settings. You still have full control over image quality.
