This looks MUCH easier than referencing MIME attachments for embedded images. …when measuring the performance of hundreds of thousands of mobile page views, that loading images using a data URI is on average 6x slower than using a binary source link such as an img tag with an src attribute! Some relevant research by Peter McLachlan: may obsolete the coolness of all this, when it gets more supported and people build cool tools for it.Data URIs are not limited to images, they could literally be anything.Setting long expires on CSS files should help. Having a CSS file that is 300k instead of 50k is fine if it saves 6 HTTP requests, but only if that CSS file is cached just as well as those images would be. You should only use this in documents that are heavily cached, like your CSS should be.If you are using PHP (or PHP as CSS), you could create data URIs on the fly like this:.
Url image converter update#
It’s easier to just update an image and replace it.
Url image converter code#
Size of embedded code is somewhat larger than size of resource by itself.Read this article about an alternate technique that does work.Use it only for progressive enhancement type stuff where having no image is perfectly acceptable, or,.Use an IE-only stylesheet to put images in, or,.Browser Compatibilityĭata URI’s don’t work in IE 5-7, but are supported in IE 8. ASCII is another, where the code is essentially URL encoded, or UTF-8. Here’s another drag and drop one.Īlso note that base64 isn’t the only possible format for a data URI and sometimes it isn’t even a good idea. Other than pure document size, this is the #1 factor concerning how fast a page loads. The biggest reason: it saves HTTP Requests. I’ll be covering the important parts next. You can see a really dumb demo page here. This data is interpreted as the type of file you are saying it is. It’s not gibberish to the browser though of course. The format, to be specific: data:,īasically, a super long string of gibberish characters. Url(data:image/gif base64,R0lGODlhEAAQAMQAAORHHOVSKudfOulrSOp3WOyDZu6QdvCchPGolfO0o/XBs/fNwfjZ0frl3/zy7////wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACH5BAkAABAALAAAAAAQABAAAAVVICSOZGlCQAosJ6mu7fiyZeKqNKToQGDsM8hBADgUXoGAiqhSvp5QAnQKGIgUhwFUYLCVDFCrKUE1lBavAViFIDlTImbKC5Gm2hB0SlBCBMQiB0UjIQA7) (It’s equally correct to say “Data URL”, which I think I prefer.) But we won't set any hard limits for this tool it's your call.Did you know that you don’t have to link to an external image file when using an element in HTML, or declaring a background-image in CSS? You can embed the image data directly into the document with data URIs. If you have many small icons, consider using CSS sprites instead. Please keep in mind it's usually not useful to embed anything larger than few kilobytes, as it will likely impact performance negatively because these images won't be cached by the browser if used in HTML and will increase CSS parsing time if used in CSS. This tool lets you select one of both ways or just a raw data URI string without the additional code.Īll major browsers currently support data URI in a CSS background property.ĭata URI in a HTML image src property is not supported by Internet Explorer. They can be used both in HTML, where the image data is placed inside the src attribute or in a CSS file as a background image. It's useful when you want to improve performance by reducing the number of HTTP requests needed to load a webpage or when you want to distribute a script/HTML page with some icons or other small images but prefer to keep it in a single file, or include images in email signatures. Data URI is a method for embedding small images directly in your HTML or CSS code using base64 encoding without the need for additional image files.
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