What's the maximum length (number of spaces) for the Alt Image Text?

[JillCS]

I'm setting up alt image text for the images on our website and I'm wondering if there is a maximum number of spaces that should be used that field.

[josh-riley]

There's a few thoughts on this one: many say keep it brief (70-100 characters). Others say it's part of content and should be the length needed to best describe/support the image. (For example,  since blind people use software that reads the image text to them, what might they need to be able to 'get' it?)

Focus on being brief and reconsider how wordy you are being if you hit more than 12 words.

[Bidofvic]

Just keep it brief. Alt text should not be longer than 100 characters. You can follow this link to gain insight on what Google want from you regarding alt tags >>https://support.google.com/webmasters/answer/114016?hl=en