LIT is the ebook format Microsoft built for its never-quite-successful Reader app. Microsoft killed the app in 2012, which left every LIT file stranded. This guide explains what LIT is, why it died, and the three ways you can still open one today.
What the LIT Format Is
LIT (short for Literature) is Microsoft Reader's native ebook format, launched in 2000 alongside the Reader app for Pocket PC and early Windows. A LIT file is, at its core, a compressed bundle of HTML and CSS — Microsoft's own variant of the CHM help-file container, wrapped with ebook-specific metadata. (CHM, the "Compiled HTML Help" format for software manuals, is the same basic idea; if you have a .chm and need it on an old Kindle, CHM to MOBI makes the move.)
Most LIT files you'll encounter also carry DRM, locked to a Microsoft account that no longer authorizes anything. That single fact is why so many old LIT books are unreadable today, even when the file itself is perfectly intact.
A Short History of LIT
Microsoft Reader arrived in 2000 with genuine ambition — ClearType text rendering, a built-in dictionary, and a clean reading experience for the time. For a few years it was a credible alternative to early Palm and Franklin e-readers.
It never caught on widely, and Microsoft announced the end of Microsoft Reader in 2011, retiring it for good in 2012. There was no successor app and no official migration tool. Every LIT file became a book trapped in a format with no current reader.
How a LIT File Is Built
Technically, LIT is an OEBPS (Open eBook Publication Structure) document — the same family of standards that led to EPUB — packed inside Microsoft's ITOLITER container. Inside you'll find:
- XHTML content for the book's text
- A CSS stylesheet for basic styling
- Images referenced by the markup
- Metadata such as title and author
- Optional DRM tied to Microsoft Passport (the ancestor of modern Microsoft accounts)
Because it's HTML-based, the text is recoverable in principle. The DRM is the part that usually isn't.
Can You Still Open a LIT File Today
Not with anything Microsoft ships. The Reader app doesn't run on current Windows, and the DRM activation servers are long gone. Your realistic options are third-party tools that ignore the format's branding and read the HTML underneath.
The two that work are Calibre (desktop) and an online converter like BookConv. Both unpack the container and rebuild the content as a modern format. The detailed walkthrough lives in our guide to converting LIT to EPUB.
How to Open LIT Without Converting
If you just want to read the book and don't care about the output format:
- Install Calibre and open it.
- Click Add books and select the LIT file.
- Select the title and click View to read it in Calibre's built-in viewer.
That gets the text on screen, but it leaves you dependent on Calibre forever. For a book you want to keep, converting is the better end state.
Why Converting to EPUB Is the Smarter Move
EPUB is the open standard nearly every non-Kindle reader supports — Apple Books, Kobo, Nook, Google Play Books, and dozens of apps. Converting your LIT to EPUB does three things at once:
- Frees the book from Microsoft's dead ecosystem
- Makes it readable on any modern device
- Gives you a clean intermediate you can later turn into PDF, AZW3, or anything else
Convert LIT to EPUB on BookConv takes a single file in the browser, no install. For a whole library, our longer guide explains the Calibre batch workflow. If your only reader is a legacy Kindle that can't open EPUB, LIT to MOBI is the fallback.
LIT vs the Formats That Replaced It
LIT lost because it was proprietary and abandoned. The formats that outlived it share one trait: an open spec.
- EPUB — open, reflowable, supported almost everywhere except Kindle
- AZW3 / KF8 — Amazon's active format, the Kindle equivalent
- PDF — fixed layout, ideal for printing but not for reading
None of these are locked to a single vendor's account system, which is exactly why your LIT files are stuck and theirs aren't. For the full picture across formats, our ebook formats comparison breaks it down.
Key Takeaways
- LIT is Microsoft Reader's dead format — launched in 2000, retired in 2012, with no successor.
- It's HTML in a proprietary box — an OEBPS document inside Microsoft's ITOLITER container, usually with DRM.
- Nothing Microsoft ships opens it now — the app won't run and the DRM servers are gone.
- Calibre or an online converter is the fix — both unpack the container and rebuild it as EPUB.
- Convert to EPUB, don't just view — a converted file is portable; a Calibre-only view keeps you locked to one tool.