Finding where to read 'Violet Evergarden' online without paying can be surprisingly tricky, and I've spent way too much time clicking through dodgy sites that either have terrible machine translations or broken chapters. It's one of those series that's super popular in anime form but weirdly hard to get a legal hold of for the novels. The official English translation is published by Yen Press, and they're pretty aggressive about taking down pirated copies, so a lot of the links you'll find on Google are already dead ends.
Your best chance is actually through library services. I know it sounds old-fashioned, but apps like Libby or Hoopla let you borrow the e-book versions for free if your local library has a subscription. You just need a library card, which is also free. It’s not having it perpetually on your device, but it’s a clean, legal read. Outside of that, you're mostly looking at fan-translated excerpts on blogs or forum posts, which are frustratingly incomplete and often vanish. I gave up and just bought the first volume on Google Play Books during a sale – sometimes supporting the official release is the only way to guarantee you get the whole, proper story.