How to Compress an Image Online

Large image files can take longer to upload, share and load on websites. Image compression reduces file size, which can make images easier to store and send. The best settings depend on the image format and how much visual detail you need to preserve.

How to compress an image

1. Open the Docly Image Compressor.
2. Choose an image from your device.
3. Select the available compression or quality setting.
4. Preview the result and compare its appearance with the original.
5. Download the compressed image if the quality and file size meet your needs.

Choosing an image format

JPEG is commonly used for photographs. PNG is useful when you need lossless graphics or transparency. WebP can provide efficient compression for supported workflows. Check that the format you choose is accepted by the website or service where you plan to use the image.

Frequently asked questions

Does compression always reduce image quality?

Lossy compression can reduce detail, while lossless methods preserve image data but may achieve a smaller reduction. Always preview the output.

What image size should I target?

There is no universal target. Use the smallest file that still looks clear at its intended display size.

Try the free online Image Compressor.