About TXTZ Files
TXTZ eBook
TXTZ is a zipped plain text ebook format used by Calibre that packages a text file with optional metadata into a ZIP archive. It provides a lightweight ebook container when rich formatting is not required.
Family
eBooks
Extension
.txtz
MIME Type
application/txtz
Can Use As
HOW TXTZ
CAME TO BE.
TXTZ — zipped plain text — is HTMLZ’s even simpler cousin. An .txtz is a ZIP archive containing a .txt file plus optional metadata. Calibre uses TXTZ as an intermediate when converting ebooks to unformatted text with preserved metadata. It’s the absolute minimalist wrapping of a plain-text ebook.
CURIOSITIES &
TRIVIA.
TXTZ is the minimum viable ebook format — a ZIP wrapping one text file.
Calibre defined TXTZ for converting ebooks where formatting doesn't matter.
Most .txtz files are unreadable by mainstream ebook apps — Calibre is the primary consumer.
Renaming .txtz → .zip gives you back the plain text file.
STRENGTHS &
LIMITATIONS.
Strengths
- Minimalist ebook wrapper.
- Plain-text core.
Limitations
- Niche.
- No reader adoption.
Typical Sizes & Weights
Novel (plain text)
200 KB - 1.5 MB
Technical Specifications
- MIME type
- application/x-txtz
- Extension
- .txtz
- Container
- ZIP + TXT
- Tool
- Calibre
CONVERT FROM
TXTZ
Common Use Cases
Plain text ebook distribution, Calibre workflows, minimal ebook format
Related Formats
Popular comparisons
TXTZ vs PDF
Differences, file size, and when to choose each format.
TXTZ vs DOCX
Differences, file size, and when to choose each format.
TXTZ vs TXT
Differences, file size, and when to choose each format.
TXTZ vs HTML
Differences, file size, and when to choose each format.
TXTZ vs EPUB
Differences, file size, and when to choose each format.
TXTZ vs MOBI
Differences, file size, and when to choose each format.
Popular TXTZ conversions
The most-requested destinations when starting from TXTZ.
Frequently Asked Questions about TXTZ
Frequently Asked Questions
TXTZ (TXTZ eBook) is an ebook format designed for reading long-form text on dedicated e-readers, tablets, and ebook apps. It is part of the ebooks family and typically supports reflowable text, embedded images, chapter navigation, cover art, and metadata (title, author, ISBN) in a portable package.
Dedicated e-readers — Kindle, Kobo, Nook, Pocketbook — support the most common ebook formats. On phones, Apple Books, Google Play Books, Moon+ Reader and KOReader all handle TXTZ. For desktop reading, Calibre is the universal ebook viewer and library manager. Convert to EPUB or PDF for maximum compatibility.
Upload your TXTZ to KaijuConverter and pick EPUB, MOBI, PDF, AZW3, or similar targets. Our Calibre-powered pipeline preserves chapter structure, embedded images, cover art, and metadata. Conversion takes seconds for typical novels; long technical books with many images may take a little longer.
EPUB is the open ebook standard — it plays on every e-reader except older Kindles and in every major ebook app. PDF is better for fixed-layout content (textbooks, coffee-table books) and printing. Pick EPUB when the ebook is reflowable text, PDF when the layout matters more than the reading experience.