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This is also a potential issue with users with restrictive data plans who have to consider every MB they download.

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And, if your target audience is likely to be on a 2G connection that download could take a couple of minutes.

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However, on a 3G connection it could take between 2 and 14 seconds to load the full email. On a good connection, a total email size of 1mb would load in a fraction of a second and seem instant to the user. You’ll likely be testing your emails in an office with a very fast connection but many of your recipients may be on mobile devices with slow 3G connection. The main issue here is the time it takes the email to load. This can vary depending on the environment where the email is opened. This is the combined size of everything when the email is opened and everything is downloaded. Again go back to the design stage to use fewer images, smaller images, or simpler images that can be compressed to smaller sizes.

Make sure you are using the most appropriate format.

Some will even adjust the compression depending on the bandwidth available.

CDN – Many CDNs have image optimization built in.

ImageOptim – on Mac, or as a web service.

There are loads of resources around to help with compressing images sizes: However, it’s more about the total size, which we’ll cover in the full loaded email size section. The maximum size for most images is 100KB, but if you have one large high res image or an animated gif that could go up to 500KB. There is currently no way of stopping this. But, remember even if you define display:none on an element, it will still download. If you’re using background images and media queries then it’s possible in certain environments not everything will be downloaded for every user. Since external sizes are rare, we’ll focus more on images for now. This can have a huge effect but be careful as many ESPs enforce a maximum line length that could force a new line and break the code.Įxternal asset size is the size of all your images and external style sheets.

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Minifying code will remove unnecessary spaces and comments. Single column emails use a lot less code. Another option is to go back to the design stage. It’s not yet safe to move all your styles to CSS, but if done correctly moving some inline styles to embedded styles can help reduce code. Fewer tables also has the added benefit of making your code easier to read. Most layouts can be achieved with 5-10 tables, but we often see code with 30-40 tables. The worst offender is adding additional table elements. Don’t over code. Some templates we see have extra code that simply isn’t needed.Clean your code. Email is constantly changing and we see a lot of templates with outdated code in them.If this happens there are a number of ways to help reduce the size of your HTML file. However, sometimes complex progressive enhancements or a large amount of campaign content results in a larger file size. Most emails should easily come in under 50KB. Clipping will hide the end of your email and can break your layout. For example, Gmail will clip your html at 102KB. The maximum size we’d recommend is 100KB, as anything over can lead to deliverability and display issues. This file size does not include the size of the included images, as these would be linked from this html file and downloaded when opened. We want to keep all of these file sizes as small as possible, but what are the maximum sizes and what should we aim for? HTML File Size When talking about file sizes in email, we’re really talking about 3 topics: the size of the HTML file sent, the size of external assets, and the fully loaded size. ***Today’s blog is a guest post by our friends at Rebel – enjoy!

Max size email for gmail