Australia's most iconic food is now officially vegan.

Vegemite has been fully certified as a vegan food by Vegan Australia.

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The move comes on World Vegan Day - Friday, November 1.

"With over 10 per cent of Australians choosing a vegan or vegetarian-based diet, it’s important that they can still enjoy the nation’s favourite spread – so we sought official certification from Vegan Australia,” Vegemite senior marketing manager Matt Gray said.

That's 2.5 million people - up from 2.2 million people just five years ago.

Vegemite nutritionist Claire Saundry said the spread had always been a fitting choice for vegans and vegetarians, but now they could confidently enjoy it.

The Vegan Australia Certified logo will begin to be seen on Vegemite jars over the next few months.

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Vegan Australia certification manager Heath Kilgour said the request showed a recognition of the shift in consumer attitudes to diet.

"Vegemite's certification demonstrates the need for a program that allows brands to give their customers the confidence that their products meet our strict standards," he said.

"Brands big and small can benefit from the association.

"The vegan market is rapidly growing and there are big changes in consumer preferences moving towards a plant-based future. The Vegan Australia Certified program allows brands such as Vegemite to show that they recognise and support this trend."

Gilmour said the certification process only takes a few weeks and involves a review of all ingredients and their origin.

To gain certification, animal products cannot be used in manufacturing nor are ingredients tested on animals.

He said the price of certification was contingent on the company's revenue and could cost as little as $150.

Other products to have earned Vegan Australia certification include fashion and skincare products, household cleaning products, petfoods and even a range of Event Cinemas choc tops and popcorn.