CONVERT LRF → TXTZ (LRF to TXTZ)
Fast, secure LRF to TXTZ conversion. No registration required.
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Studio Panel
Ghostscript + QPDFHOW TO CONVERT LRF → TXTZ
Start the job
Upload a LRF; we read metadata, cover image and table of contents from the source container.
Rewrite as TXTZ
The content is flowed into the TXTZ format with appropriate CSS, images re-encoded at recommended dimensions.
Save the ebook
Download the TXTZ. Side-load to your device or drop into your reader library.
Starting point: LRF is Sony's BBeB legacy ebook format for the original Sony Reader. Natural next step, a TXTZ. A TXTZ converted from a LRF is a new ebook container with the same content inside. The text body survives losslessly; formatting survives as closely as the TXTZ container supports it; cover images are re-embedded at the target's recommended dimensions. A quick refresher — LRF is Sony's BBeB legacy ebook format for the original Sony Reader. By contrast, TXTZ is an ebook-family format used for digital reading on e-readers and reading apps.
Why convert LRF to TXTZ
Library applications (Calibre, Apple Books, Kindle library) prefer a single format for indexing. Converting mixed LRF/TXTZ collections to one canonical TXTZ makes search, filter and sync work reliably.
LRF vs TXTZ — Technical specifications
Side-by-side comparison of the technical details.
LRF
- MIME type
- application/x-sony-bbeb
- Extension
- .lrf
- Native reader
- Sony PRS series (retired 2014)
- MIME Type
- application/x-sony-bbeb
- Category
- eBooks
- Full Name
- Sony LRF eBook
- Conversion Engine
- CALIBRE
TXTZ
- MIME type
- application/x-txtz
- Extension
- .txtz
- MIME Type
- application/txtz
- Category
- eBooks
- Full Name
- TXTZ eBook
- Conversion Engine
- CALIBRE
- Container
- ZIP + TXT
- Tool
- Calibre
| Specification | LRF | TXTZ |
|---|---|---|
| MIME type | application/x-sony-bbeb | application/x-txtz |
| Extension | .lrf | .txtz |
| Native reader | Sony PRS series (retired 2014) | — |
| MIME Type | application/x-sony-bbeb | application/txtz |
| Category | eBooks | eBooks |
| Full Name | Sony LRF eBook | TXTZ eBook |
| Conversion Engine | CALIBRE | CALIBRE |
| Container | — | ZIP + TXT |
| Tool | — | Calibre |
LRF vs TXTZ — Strengths and limitations
What each format does best, and where it falls short.
LRF Strengths
- Sony PRS-native.
- Rich layout.
- Calibre-readable.
Limitations
- Deprecated.
- Sony exited the market.
- No new content.
TXTZ Strengths
- Minimalist ebook wrapper.
- Plain-text core.
Limitations
- Niche.
- No reader adoption.
Quality & Compatibility
DRM-protected LRF files cannot be converted — KaijuConverter respects publisher encryption and returns an error rather than stripping protection. Unprotected or self-published LRF ebooks convert without restriction.
Tips for Best Results
- Use structure detection (TOC > chapters) to regenerate a clean table of contents in the TXTZ if the LRF has none.
- Embedded fonts bloat file size — consider dropping them in Advanced if your reader uses its own typography anyway.
- For serialised fiction, keep cover art consistent across episodes by re-using one TXTZ cover rather than auto-generating per LRF.
Frequently Asked Questions
Yes. The free tier accepts files up to 25 MB without registration, email capture or watermarks; paid plans go up to 2 GB. Paid plans raise the size cap, enable batch conversions and provide a REST API for automation, but nothing on the free tier is quality-limited — the output is exactly the same as on any paid plan.
Yes, provided the LRF itself has a well-formed ToC. Calibre reads the navigation structure and writes an equivalent ToC into the TXTZ. If the source lacks a ToC we can generate one from heading levels in Advanced → structure detection.
Uploads run over HTTPS, files are processed in isolated containers, and both the source LRF and the TXTZ output are auto-deleted within two hours. No account is required, file contents are never logged, and KaijuConverter does not use uploads for AI training. The paid plan adds a signable data-processing agreement for regulated workflows.
No. KaijuConverter does not strip digital rights management. DRM-free LRF files — anything you authored yourself, public-domain classics, files from DRM-free retailers — convert without any restriction.
Most files finish in well under a minute. Small images and documents are typically ready in a few seconds; large video or audio files scale roughly with duration. Upload speed from your network is usually the dominant factor, not server time.
Yes. The cover is extracted from the LRF and re-embedded in the TXTZ at device-appropriate dimensions. You can also override it in Advanced by uploading a custom cover image alongside the book file.
Sony LRF eBook
Source formatLRF (BBeB Book) is a proprietary ebook format developed by Sony for their Reader line of e-ink devices. It supports reflowable text, images, and basic formatting, but has been superseded by EPUB on newer Sony Reader models.
TXTZ eBook
Target formatTXTZ 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.
Going the other way? Convert TXTZ back to LRF with the same engine.
Common Use Cases
Share across platforms
Send TXTZ files to anyone without worrying about whether they have the right software for LRF.
Embed in documents
Drop TXTZ output into Word, Google Docs, PowerPoint, Notion or a website without conversion warnings.
Optimize size
TXTZ often produces smaller files than LRF for web, email and storage.
Archive & future-proof
Store in a widely-supported format that will still open on future operating systems without legacy plugins.
LRF vs TXTZ — Typical file sizes
Approximate file sizes for common scenarios.
- Typical novel 500 KB - 3 MB
- Novel (plain text) 200 KB - 1.5 MB
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Related comparisons
See these formats side by side to understand which fits your use case best.
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