Free online PDB to MOBI converter

PDB and MOBI are ebook file formats used for reading digital books on different devices and apps. PDB is an older Palm Database format that was also used for ebooks on Palm OS devices, while MOBI is a Kindle-friendly ebook format designed for reflowable reading on e-readers and mobile devices.

What is a PDB file

A PDB file can store different kinds of data, but in ebook workflows it usually refers to a Palm ebook file. These files are often older and may contain plain text, formatting, and basic book structure. Because support for PDB ebooks is limited today, converting them to a modern format is often the best way to keep them readable.

What is a MOBI file

A MOBI file is an ebook format associated with Amazon Kindle and other compatible readers. It supports reflowable text, bookmarks, and basic formatting, making it much more practical for modern reading devices than legacy Palm ebook files.

Why convert PDB to MOBI

Converting PDB to MOBI helps make older ebooks usable on Kindle devices and apps. It also improves compatibility, preserves readability on different screen sizes, and makes it easier to manage your ebook library in current reading software.

Best software for conversion

The best overall tool for this conversion is Calibre. It is free, widely trusted, and supports many ebook formats. Calibre can import a PDB ebook and export it to MOBI with good control over metadata, cover images, and formatting.

Use Add books to import the PDB file, then choose Convert books and select MOBI as the output format. If needed, you can adjust title, author, cover, and layout settings before converting.

Alternative converters

If Calibre does not open your specific PDB file correctly, try an online ebook converter or a dedicated Palm ebook utility. However, online tools may have file size limits and privacy concerns, so desktop software is usually safer for personal books.

Conversion tips

• Check the PDB type first, because not every PDB file is an ebook.
• Verify formatting after conversion, especially headings, images, and line breaks.
• Use Calibre metadata tools to improve the title, author, and cover before exporting.
• Test the MOBI file on your Kindle app or device to confirm readability.

Recommended workflow

1. Open Calibre.
2. Choose Add books and select the PDB file.
3. Click Convert books.
4. Set the output format to MOBI.
5. Review conversion settings and start the process.
6. Transfer the finished MOBI file to your Kindle or reading app.

Summary

PDB to MOBI conversion is a practical way to modernize older ebook files for Kindle-compatible reading. Calibre is the best software choice for most users because it is reliable, free, and easy to use.