How to Compress an Image Without Losing Much Quality
A photo straight off a phone or camera can be four or five megabytes, sometimes more. That’s too big to email, too heavy for a web page, and enough to get bounced by an upload limit. Compressing it brings the file size right down, and you can usually do it without the picture looking any different.
Compress the image
- Open the image compressor.
- Add your photo. You can drop in a JPG, PNG, or WebP, and add several at once.
- Move the quality slider and watch the preview. Stop when the size is small enough and the image still looks good.
- Download it, or grab all of them together.
Everything runs in your browser, so nothing gets uploaded no matter how big the photo is.
“Without losing quality” is not quite true, and that’s fine
Here’s the honest version: compression always trades away a little quality for a smaller file. The trick is that you can throw away a surprising amount before your eyes can tell. On most photos you can cut the file to a third or less of its size and still not see a difference at normal viewing size.
So don’t chase a perfect, untouched image at a tiny size. Aim for “looks the same to me” and let the file be as small as it wants to be at that point. The preview is there so you can find that line yourself.
Which format compresses best
- JPG and WebP are built for photos. They use lossy compression, which is what makes them shrink so well. WebP is the newer one and usually comes out noticeably smaller than JPG at the same quality.
- PNG is lossless, which is great for logos, screenshots, and anything with sharp edges or transparency, but it’s a poor fit for photos. If you have a photo saved as a PNG, you’ll often get a far smaller file by converting it to WebP or JPG than by compressing the PNG.
So a quick rule: photo, use JPG or WebP. Flat graphic with text or transparency, keep it PNG.
Resize first if the image is huge
Compression lowers quality to save space, but it doesn’t change the dimensions. If you have a 6000-pixel-wide photo that only needs to be 1200 pixels wide for a web page, resizing it first will shrink the file more than compression alone, and it costs you nothing you’d actually see. Resize down to the size you need, then compress.
Common questions
Will people be able to tell it was compressed? At sensible settings, no. Push the quality slider too low and you’ll start to see blocky patches, especially in skies and smooth gradients, so keep an eye on the preview.
Can I compress the same image twice? You can, but each pass throws away a bit more, so it can start to look rough. Better to go back to the original and compress it once at the right setting.
Is there a limit on how many I can do? No. Because it runs in your browser, you can compress as many images as you like, free.