.lit

File format · Released 2000 · By Microsoft

About LIT Files

Microsoft LIT

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

Family

eBooks

Extension

.lit

MIME Type

application/x-ms-reader

Can Use As

Input

● Hex Magic-Bytes Signature (Offset 0x00) eBooks Binary/Text Stream

4C 49 54 46 00 01 00 00 4B 41 49 4A ASCII: LITF....KAIJ

Convert LIT → HTMLZ → 14+ CONVERSIONS ↓

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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.

ISO / MIME SPECS

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

Typical Sizes & Weights

Novel (text only)

200 KB - 1 MB

Illustrated book

2-10 MB

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.

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.

STUDIO TOOLS FOR LIT

Specialized Utilities for .LIT Files

View all 45 tools →

merge →

Merge PDF

Combine multiple PDF files into a single document. Drag and drop to reorder pages before merging. No software installation required.

split →

Split PDF

Split a PDF into separate files by page ranges or extract individual pages. Perfect for isolating chapters, invoices, or specific sections.

compress →

Compress PDF

Reduce PDF file size without visible quality loss. Choose from low, medium, or high compression levels. Ideal for email attachments and web uploads.

convert →

PDF to Word Converter

Convert PDF documents into editable Microsoft Word (DOCX) files online for free while preserving layout, tables, and typography.

convert →

Word to PDF Converter

Convert Microsoft Word documents (DOCX, DOC) into print-ready PDF files with exact font embedding and layout preservation.

convert →

PDF to Excel Converter

Extract tables, financial rows, and structured columns from PDF files directly into editable Microsoft Excel (XLSX) spreadsheets.

ocr →

Make PDF Searchable (OCR)

Add a searchable text layer to scanned PDF documents using OCR. The visual appearance stays the same but you can now search, select, and copy text.

decrypt →

Unlock PDF

Remove owner printing/copying restrictions and decrypt password-protected PDF files instantaneously once you enter the known password.

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