Free online Sony Reader to Mobipocket eBook converter. Files are processed locally in your browser — no uploads, 100% private.
Drop your .LRF file here
or click to browse from your device
100% browser-based — no server uploads, no cloud processing
Free forever — no account or subscription required
Supports batch conversion for multiple files at once
Works on any device — desktop, tablet, and mobile
Results available in seconds — no server queue or wait time
Files are cleared immediately after processing for maximum privacy
Sony BroadBand eBook format
Mobipocket eBook — used by older Kindle devices
Source: Sony BroadBand eBook format
Output: Mobipocket eBook — used by older Kindle devices
100% browser-based processing — files never leave your device
Free with no file limits, watermarks, or registration required
Formatting can vary between different reader apps
DRM-protected ebooks may limit portability
Complex layouts may not reflow correctly on all devices
E-reader device reading (Kindle, Kobo, etc.)
Digital book publishing and distribution
Personal reading library management
Academic and professional reference materials
Test rendering on Kindle, Kobo, and Apple Books for cross-reader compatibility
Use 72 DPI for cover images to keep file size small and fast to download
Validate EPUB files with EPUBcheck before uploading to publishing platforms
Include a fallback font specification in case the device font is unavailable
Drag & drop your file or click to browse
Files are processed instantly in your browser
Save your converted or processed file
Upload your LRF file using the drop zone above. Your file is instantly converted to MOBI format right in your browser — no server upload, no waiting.
Completely. Our converter processes your LRF file 100% in your browser using client-side code. It never leaves your device or touches any external server.
It depends on the formats. Converting from lossless to lossy (e.g. PNG to JPEG) may reduce quality. Converting lossless-to-lossless (e.g. PNG to WebP lossless) preserves all quality.
Free, instant, and 100% private. Your files are processed locally in your browser.