About LIT Files

Microsoft LIT

Released 2000 By Microsoft

LIT is a legacy Microsoft Reader eBook format, now obsolete.

Family

eBooks

Extension

.lit

MIME Type

application/x-ms-reader

Can Use As

Input

The story

HOW LIT
CAME TO BE.

2000

2007

2011

2012

LIT — Microsoft Reader — was Microsoft’s bet on the early ebook market, launched in 2000 alongside the Microsoft Reader app for Windows and Pocket PC. LIT files used Microsoft’s ClearType technology to render text more crisply on screen than competing formats; the software was genuinely good for its era. The catch was DRM: most commercial LIT books were tied to a specific Microsoft Passport account (the precursor to Microsoft Account).

Microsoft Reader never took off. Adobe’s PDF dominated technical ebooks; Amazon’s Kindle arrived in 2007 and ate the consumer market; the iBookstore swept in mobile. Microsoft killed Reader development around 2011 and shut down the final activation servers in August 2012, stranding every DRM-protected LIT purchase as unusable files. The format survives in some library archives and in collectors’ personal libraries — a cautionary tale about ebook DRM that the industry mostly ignored.

CURIOSITIES &
TRIVIA.

Microsoft shut down the Microsoft Reader DRM activation servers in August 2012, making every commercially-purchased LIT file unreadable without emergency workarounds.

LIT used ClearType subpixel rendering before most operating systems had it built in — the app genuinely looked gorgeous in its day.

A .lit file is internally similar to CHM (Compiled HTML Help) — both use Microsoft's LZX compression.

Library ebook lending systems like OverDrive briefly supported LIT before abandoning it for EPUB and Kindle formats.

The Microsoft Reader app itself was a free download, but Microsoft made no new releases after 2011 — it languishes in Windows 7-era screenshots.

STRENGTHS &
LIMITATIONS.

Strengths

Good rendering quality via ClearType in its era.
Efficient compression via LZX.
Small file sizes for text-heavy books.

Limitations

DRM activation servers are permanently offline — DRM-protected purchases are dead weight.
Proprietary format with no vendor successor.
Zero modern reader support (Windows, macOS, iOS, Android).
Microsoft officially retired the product in 2012.

Typical Sizes & Weights

Novel (text only)

200 KB - 1 MB

Illustrated book

2-10 MB

Technical Specifications

MIME type: application/x-ms-reader
Extension: .lit
Container: CHM-like (LZX-compressed OEBPS)
DRM: Microsoft Reader activation (servers offline since 2012)
Status: Retired

CONVERT FROM
LIT

lit pdf lit docx lit odt lit txt lit md lit html lit epub lit mobi lit azw3 lit fb2 lit rst lit htmlz lit txtz lit pdb

Common Use Cases

Legacy Microsoft eBooks