Some are great, some are good, some should be avoided. There are a lot of tools out there that offer to compress your images. On the other hand, when used in moderation, it can reduce file sizes drastically, and won't be visible to the naked eye at all. You lose some data, which may result in artifacts, such as pixelation, blurry patches, wobbly or dark edges, etc. Can reduce file sizes by huge amounts, especially if you exported from a design program that doesn't do a very good job at compression (yes, I'm looking at you Fireworks).
You don't lose any data, the algorithm just finds a way to package it more efficiently. There are two forms of compression: lossless This is especially important for users visiting your site from a mobile device.
Compression is a great way to reduce file size, and thus download times, for your images. CompressionĪ bit more about compressing your images.
Hope this helps, and good luck with the website.Įdit: a bit more about compression. Downsides to consider are: you need to have some knowledge of html to properly use this format in your site, and support by older browsers is not that good ( See: Can I use for more info). Upside is a perfect quality in every resolution, since it's resolution-independent. Since this is a vector format, it's best used for images created in vector format (but since you're exporting from AI, that won't be a problem). svgĪs suggested, this does offer the best file size to quality-ratio. Features both lossless and lossy compression. pngĬan handle transparency, but usually results in higher file sizes. Usually, a little compression doesn't hurt, and can reduce your file by a large amount. Play around with the 'quality' slider to see a preview of the rendered image. Downside is that it has lossy compression, resulting in artifacts and a pixelated appearance when compressed too hard. When you don't need any transparancy, you can use the jpg format. You can adjust the pixel-size when exporting by resizing to exact pixels or percentages. If it's too small, it will appear pixelated and look bad. If it's too large, the user will have to download an unnecessarily huge file, slowing down your website and resulting in a bad experience. It's important that you export the logo to the right pixel-size. First of all, try to be as specific as possible when asking questions.
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