CONVERT
PDB → MOBI
Fast, secure PDB to MOBI conversion. No registration required.
DRAG. DROP. DONE.
Upload any file and our engines will handle format detection automatically.
Max 100 MB · Free plan · No signup required
Convert to:
Detecting available formats...
Uploading...
Processing your file...
PDB is an ebook format tuned for reflowable reading on e-readers and mobile devices. Reaching a MOBI from there is one hop. Going from PDB to MOBI preserves the book structure — ToC, chapters, cover image, bold/italic runs, embedded fonts where licensing permits — and emits a MOBI file that reflows correctly on small screens. The pipeline handles the CSS remapping and image re-encoding automatically. Context: PDB is an ebook format tuned for reflowable reading on e-readers and mobile devices. MOBI is Amazon's legacy Mobipocket ebook format, the older Kindle delivery format.
PalmDOC eBook
Source formatPDB (Palm Database) is a generic database format from the Palm OS era that was widely used for ebooks on Palm handheld devices. PalmDOC and Mobipocket both use PDB as their underlying container for storing text-based ebook content.
Mobipocket eBook
Target formatMOBI is the Mobipocket eBook format historically used by Amazon Kindle devices. While Amazon has moved to newer formats, MOBI remains relevant for older Kindles and legacy eBook libraries.
Why convert PDB to MOBI
Library applications (Calibre, Apple Books, Kindle library) prefer a single format for indexing. Converting mixed PDB/MOBI collections to one canonical MOBI makes search, filter and sync work reliably.
HOW TO CONVERT
PDB → MOBI
Start the job
Upload a PDB; we read metadata, cover image and table of contents from the source container.
Rewrite as MOBI
The content is flowed into the MOBI format with appropriate CSS, images re-encoded at recommended dimensions.
Save the ebook
Download the MOBI. Side-load to your device or drop into your reader library.
Common Use Cases
Language-learning ebooks
Dictionary lookup and sentence highlighting work better on MOBI in most reader apps than on PDB.
Technical book reading
Code blocks and tables render more reliably in MOBI across devices; PDB can break them on narrow screens.
Audiobook companion
Whispersync-style features expect MOBI; convert the PDB of your book to pair text and audio.
Giveaways and mailing lists
Subscribers want a MOBI they can open instantly; a PDB introduces install friction that kills open rates.
Quality & Compatibility
DRM-protected PDB files cannot be converted — KaijuConverter respects publisher encryption and returns an error rather than stripping protection. Unprotected or self-published PDB ebooks convert without restriction.
Tips for Best Results
- Use structure detection (TOC > chapters) to regenerate a clean table of contents in the MOBI if the PDB has none.
- Embedded fonts bloat file size — consider dropping them in Advanced if your reader uses its own typography anyway.
- For serialised fiction, keep cover art consistent across episodes by re-using one MOBI cover rather than auto-generating per PDB.
Frequently Asked Questions
Frequently Asked Questions
Yes. The free tier accepts files up to 100 MB without registration, email capture or watermarks. Paid plans raise the size cap, enable batch conversions and provide a REST API for automation, but nothing on the free tier is quality-limited — the output is exactly the same as on any paid plan.
Yes, provided the PDB itself has a well-formed ToC. Calibre reads the navigation structure and writes an equivalent ToC into the MOBI. If the source lacks a ToC we can generate one from heading levels in Advanced → structure detection.
Uploads run over HTTPS, files are processed in isolated containers, and both the source PDB and the MOBI output are auto-deleted within two hours. No account is required, file contents are never logged, and KaijuConverter does not use uploads for AI training. The paid plan adds a signable data-processing agreement for regulated workflows.
No. KaijuConverter does not strip digital rights management. DRM-free PDB files — anything you authored yourself, public-domain classics, files from DRM-free retailers — convert without any restriction.
Most files finish in well under a minute. Small images and documents are typically ready in a few seconds; large video or audio files scale roughly with duration. Upload speed from your network is usually the dominant factor, not server time.
Yes. The cover is extracted from the PDB and re-embedded in the MOBI at device-appropriate dimensions. You can also override it in Advanced by uploading a custom cover image alongside the book file.
RELATED CONVERSIONS
Other popular pairs involving PDB or MOBI
More from PDB
More ways to reach MOBI
Secure & Private Conversion
Your files are encrypted during transfer, processed in isolated containers, and automatically deleted within 2 hours. We never read, share, or store your data.