How to Optimize Your Images For Search Engine Traffic

6 Apr

Filenames

This is one of the most basic elements of image optimization. If you have an image of blue widgets, I would name your image “blue-widgets.jpg” or “blue-widgets.gif”. You can use other formats like PNG, but I have gotten better results with “jpg” and “gif” files. You can use other characters like underscore as word delimiters, but I get better results with hyphens. You can run the words together if they are separate in other factors. I have found stemming plays a role (ie widget vs widgets), but you can get around it using other factors. I haven’t seen capitalization play a role, but I prefer to use all lower case because I usually use Apache servers and case sensitivity matters. If you are going to have multiple images of the same object-type, I suggest adding a “-1″, “-2″ onto the end.

Now, before the hate mail or hate tweets start, it is entirely possible to have an image rank without the keywords being in the file nameIF there are enough other factors in place. However, you should ask yourself why would you give up a chance to give a search engine a signal about what an image is about? If you work on a large ecommerce platform or other large database application, chances are good that your gold diamond earrings will have an image file name like “GDX347294.jpg” that corresponds to the item’s SKU or other internal classifier. So, yes, you will have to sacrifice the keyword for business reasons.

ALT Text

Let’s get the basic information out of the way: ALT text was designed for screen readers or visually-impaired people to know what they weren’t seeing. Your goal is to use it to satisfy the screen readers while being keyword focused enough for the search engines and without being a keyword stuffing spammer. Here’s an example of ALT text variations:

Keyword stuffed: discount hotel room paris france

ALT text only: Eiffel Tower

SEO optimized: Eiffel Tower from Louvre Bons Enfants hotel room

Striving to find a balance between pleasing the search engines and text readers can be a juggling act. If you are risky with some of your other SEO techniques, I’d play this on the safe side.

Headings and Bold Text

If image optimization for a particular image is important, I really like to optimize the image with bold or a heading tag of the term I’m chasing right above the image. I’ve found this really helps give a strong signal to the engines

Oceanus Statue from Trevi Fountain

Image Captions

Image captions like the one to the right are another way I really like to give the search engines a good nudge in the direction I want them to go. Try to place the search term you are trying to optimize for at the front of the caption.

Image size

I’ve found that if you keep your images a reasonable size you generally do better with image optimization. That’s not to say really big or really small images won’t rank, just that images that are larger than 100×100 and smaller than 1200×1200 work best. Using a thumbnail that links to a larger picture can be helpful.

Image Traffic

So what can you expect from image traffic? Like all things, it depends on what you are chasing, but I have one image that ranks on the first page for a single word term that brings in hundreds of views for me every month. The page has adsense on it and, over a single year, it brings in several hundred dollars worth of revenue. It’s something to think about before you write off image optimization.

Images Traffic Data

So what are the takeaways from this post:

  • Try to name your images with your keywords if possible, using the hyphen as a delimiter.
  • Shorter names are better than longer. Avoid using more than 4 words if possible.
  • Keep your ALT text keyword focused without being stuffed or spammy.
  • If possible use headings or bold tags above or directly next to the image.
  • Use captions if at all possible and keep the keywords closer to the front of the caption.
  • Keep the images a reasonable size. They should be large enough for people to see but small enough to fit on a screen.
  • If you own the image, encourage people to reuse your image in exchange for a link.
  • Try to find a way to monetize image traffic with CPM advertising, adsense, or affiliate links.

Originally published at Graywolf’s SEO Blog

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