PDF to MOBI
Convert PDF documents to MOBI format online for free. Read your PDF files on a Kindle device or the Kindle app.
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About this tool
Convert PDF documents to MOBI format for reading on Kindle devices and the Kindle app. MOBI is Amazon's original Kindle ebook format, supported by all Kindle hardware and the Kindle app on iOS and Android. While PDFs can be opened on Kindle, they display as fixed-layout images with tiny, non-reflowable text. Converting to MOBI produces a reflowable ebook where the text adapts to the screen size and your chosen font preferences. Note: MOBI was officially retired by Amazon in 2022, but Kindle devices still open MOBI files, and the format remains functional for personal use.
File size: MOBI output is typically smaller than the source PDF for text-heavy documents. Image-heavy PDFs may produce larger MOBI files.
Quality: Converted by Calibre. Text-based PDFs convert well. Scanned PDFs or complex multi-column layouts may produce inconsistent results.
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How to convert
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1Upload your PDF file.
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2Calibre converts the PDF to a reflowable MOBI ebook.
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3Download the MOBI and transfer it to your Kindle via USB or email.
help
FAQ
Is MOBI still supported by Kindle?
Yes, Kindle devices still open MOBI files even though Amazon retired the format for sideloading via Send to Kindle in 2022. For newer workflows, EPUB is now preferred.
Will the PDF layout be preserved?
The conversion attempts to extract text and create a reflowable layout. Complex multi-column PDFs or PDFs built from scanned images may not convert cleanly.
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Common use cases
- check_circle Reading a PDF book on a Kindle without pinching and zooming
- check_circle Converting a PDF article or report to MOBI for comfortable e-ink reading
- check_circle Sideloading documents to Kindle for long-form offline reading
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