.lrf

File format · Released 2006 · By Sony

About LRF Files

Sony LRF eBook

LRF (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 It supports reflowable text, images, and basic formatting, but has been superseded by EPUB on newer Sony Reader models.

Family

eBooks

Extension

.lrf

MIME Type

application/x-sony-bbeb

Can Use As

Input

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

4C 52 46 46 00 01 00 00 4B 41 49 4A ASCII: LRFF....KAIJ

Convert LRF → PDF → 15+ CONVERSIONS ↓

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📈 Target Minimum File Size (Guaranteed ≥ KB)

Lossless JPEG Q100 + standard COM segment padding for government & exam portals

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The story

HOW LRF CAME TO BE.

2006

2012

2014

2026

LRF was the native format of Sony’s PRS-series ebook readers (2006-2012), Sony’s attempt to compete with Amazon Kindle. A .lrf file is a structured ebook container with embedded fonts, images, and pagination — Sony’s equivalent of AZW or EPUB. Sony also supported EPUB directly on PRS readers, which effectively made LRF redundant.

Sony exited the US ebook market in 2014 and ceased PRS production. LRF files still exist in archives from that era; Calibre reads them and converts to modern formats. No new content is produced as LRF in 2026.

ISO / MIME SPECS

Technical Specifications

MIME type: application/x-sony-bbeb
Extension: .lrf
Native reader: Sony PRS series (retired 2014)

Typical Sizes & Weights

Typical novel

500 KB - 3 MB

STRENGTHS & LIMITATIONS.

Strengths

Sony PRS-native.
Rich layout.
Calibre-readable.

Limitations

Deprecated.
Sony exited the market.
No new content.

CURIOSITIES & TRIVIA.

Sony's PRS-505 (2007) was the first ebook reader with E Ink display in US retail — shipping .lrf files.

Sony's Reader Store sold thousands of LRF titles before shutting down in 2014.

Calibre reads LRF natively — every legacy Sony ebook can be converted to modern EPUB.

Sony exited the US ebook market in 2014 — LRF effectively died with Kindle's victory.

LRF supports embedded fonts, images, and per-page layouts — more capable than early MOBI.

STUDIO TOOLS FOR LRF

Specialized Utilities for .LRF 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 LRF

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

CONVERT TO LRF

htmlz lrf txtz lrf pdb lrf snb lrf

Common Use Cases

Legacy Sony Reader devices, BBeB ebook archives, vintage e-reader content