I'm not entirely sure what you mean. You can, if you want, run the file through Windows Movie Maker, though that considerably lowers the quality while taking a long time.
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What you're looking for shouldn't be hard to find. I just Googled "mp4 to gif" and came up with a ton of results, like http://ezgif.com/video-to-gif, http://www.zamzar.com/convert/mp4-to-gif/, https://convertio.co/mp4-gif/, and more.