Unpack an ebook archive and prepare the files for Kindle

1. Extract the archive

Only open archives from a source you trust. You can extract a local ZIP, RAR or 7Z archive with Unzip.Cool or another archive utility. After extraction, look for EPUB, PDF, MOBI or AZW3 files and ignore executable files you did not expect.

2. Check whether conversion is needed

Amazon’s current transfer guidance lists EPUB and PDF among the file types accepted by Send to Kindle. If your extracted book is already EPUB, sending that file may be simpler than turning it into MOBI.

Conversion can still be useful for an older sideloading workflow or for a file that renders poorly. Amazon’s publishing guidance treats MOBI as a legacy format and points modern publishing workflows toward EPUB, DOCX or KPF.

3. Convert the smallest necessary step

• EPUB already available: try the EPUB directly first.
• Text-heavy PDF: consider PDF to EPUB for reflowable reading.
• Older local workflow: EPUB to MOBI may help, but test it on the target device.
• Modern Kindle-compatible local file: AZW3 can preserve more styling than MOBI.

4. Inspect before transfer

Open the converted book in a compatible reader and sample the cover, table of contents, chapter boundaries and image-heavy pages. Keep the original file until the transfer succeeds.