You can also choose to compare the before and after pictures if you want to check for any loss in quality. If you want to try these, we recommend Compressor.io and Squoosh.Ĭompressor.io allows you to upload images up to 10MB in size, it will then compress them, show you the file size reduction and offer you a download link. There are a number of online tools that can compress images for you. This can make a big difference to the file size, but also to the image quality. When saving an image in an image editor, check to see if there is a “quality” or “compression” option that you could adjust. Many image formats support different levels of compression.

Reductions in image dimensions make a big difference to file size when the image is particularly large. Tip: While you’re saving in a different image format, you could also try reducing the dimensions of the image too.

Any sort of image editor should be able to save an image in a new format. Generally, if you open a PNG image and then re-save it as a JPG, the resulting image file size is smaller. For example, PNG uses lossless compression, while JPG uses a lossy format. Compressing images on your computerĪ simple way to compress an image is to try changing the file format. If you encounter this though, instead of giving up, you can compress the image yourself and then upload the compressed image.

Unfortunately, most sites don’t do this and just throw an error instead. Ideally, if you tried to upload an image that was too big, a website or app, would instead choose to generate a compressed version on the fly, and save that instead. With careful optimisation, the quality loss of lossy image compression can be almost imperceptible. Lossy compression can reduce the file size even further but results in a loss of image quality. Lossless compression makes reasonable reductions in file sizes while maintains full image quality. There are two classes of compression algorithm, lossless and lossy. Image compression uses advanced techniques to minimise the amount of data required to represent the image. The other method is to compress the image. For example, reducing a 4K image to 1080p should roughly cut the image file size to a quarter of what it was. The first is downscaling, which just involves reducing the dimensions of an image. There are two techniques used to reduce image file size. With a small amount of image processing, however, it should be easy to be able to upload a reasonably high-quality image. Most users when they see that their image was rejected for being too big, may try sending it on another platform, but will likely just give up.

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