Image Compressor

Compress images without losing quality

Large image files slow down websites, fill up storage and bounce off email size limits. An image compressor shrinks the file size by re-encoding the picture more efficiently — often cutting 60–90% off the original while keeping it visually identical.

This tool uses a battle-tested compression library that runs inside a Web Worker in your browser. You set a target maximum size and it intelligently lowers quality (and dimensions if necessary) to hit that target. Because it all happens on your device, there are no upload waits, no file-size paywalls and complete privacy.

Tips for the best results

For photographs, choose JPG or WebP output — they compress photos far better than PNG. Use WebP when you want the smallest possible file for the web. Start with a generous target like 0.5 MB and lower it gradually; you'll see where quality starts to suffer and can stop just before that point.

How the size target works

The tool repeatedly re-encodes the image at lower quality until the file fits under your maximum size, and it never makes an image larger than 4096 pixels on its longest side. You can drop several images at once; they are processed one after another, each result is downloaded automatically, and the status line shows the size before and after. If a picture is already smaller than your target, the result can be close to the original size.

Choosing a format

• JPG is lossy and works best for photos. It cannot store transparency, so transparent areas become a solid color.
• WebP is usually smaller than JPG at similar quality and supports transparency.
• PNG is lossless, so the tool can only reach a small target by reducing dimensions. It suits screenshots and graphics, not photos.

Compress from your original file whenever you can. Compressing an already compressed JPG again adds another round of loss, so keep the source and create each smaller version from it.

Checking the result

Open the compressed file at 100% zoom and look at gradients, skies and text edges, where banding and blockiness appear first. If they look worse than you would like, raise the target size a little and run it again from the original. Because everything runs on your own device, large batches depend on your computer’s memory, so process very big photos in smaller groups.