If you’re hunting for legal ways to get DC Comics in a downloadable format, I’ve got a little map of places I check. The easiest starting point is official digital retailers: ComiXology (Amazon), Kindle, Google Play Books, and Apple Books regularly sell single issues and graphic novels from DC. Buying there means you own a digital copy tied to your account and can read it on multiple devices. Another big option is the DC-owned subscription library, 'DC Universe Infinite' — it’s fantastic for bingeing older runs and major titles, though it’s a streaming/subscription model rather than a straight PDF download in many cases.
Libraries are a surprisingly great legal route. Apps like Hoopla and Libby/OverDrive let you borrow digital comics for free if your local library subscribes; availability varies, but I’ve borrowed everything from 'Batman' arcs to 'Sandman' through these services. Some library apps support offline downloads for the loan period. If you prefer owning files, keep an eye on bundle deals: from time to time Humble Bundle or publisher promos will offer DRM-free formats (PDF, CBZ) for collections, though DC-specific DRM-free sales are rarer.
One practical note: a lot of major DC releases are distributed with DRM or in app-specific formats, so expect to use the vendor’s reader. If having a true PDF file is crucial, your best legal luck is with special sales or collected editions where the seller explicitly provides a DRM-free PDF. I also keep an eye on sales and holiday promotions — I’ve nabbed plenty of classic runs for cheap that way. In short: official stores and subscriptions, library apps, and occasional DRM-free bundles are the lanes I stick to; nothing beats rereading 'The Dark Knight Returns' on a lazy afternoon, honestly.