Free Windows tool · For Audiobookshelf & Calibre
Point it at the mess.
Get back a library.
Library Organizer scans your audiobook and ebook folders, works out the real authors, series, and titles, and copies everything into a clean Author / Series / Title structure that Audiobookshelf and Calibre import on the first try. Your original files are never touched.
Download the organizer See how it worksOne Python file. Runs entirely on your own PC — nothing uploaded, no account, no cost.
Before — the folder you don’t open anymore
Downloads\ ├─ THE MARTIAN by andy weir.m4b ├─ sanderson_mistborn1_final empire\ │ 01.mp3 … 47.mp3 ├─ notw (1).epub └─ New folder (3)\ wise mans fear book2.m4b
After — ready to import
Library\ ├─ Andy Weir\The Martian\ ├─ Brandon Sanderson\Mistborn\ │ 01 - The Final Empire\ ├─ Patrick Rothfuss\Kingkiller Chronicle\ │ 01 - The Name of the Wind\ └─ 02 - The Wise Man's Fear\
How it works
Scan. Review. Copy. That’s the whole job.
It’s deliberately not another library manager. It does one thing — build a perfect folder structure — then gets out of the way and hands your collection to the tools you already use.
STEP 1
Scan
Pick your messy source folder. Every audiobook and ebook is detected — multi-part MP3 books are grouped as one title, covers and .nfo files tag along, and each book appears as a row with its proposed author, series, and title.
STEP 2
Review
Anything uncertain is highlighted so nothing slips through. Double-click a row to fix it — a live preview shows exactly where the book will land. One click runs an online lookup to polish spelling and naming.
STEP 3
Copy
Approve the plan and it copies — never moves — everything into the clean structure. Already-copied books are skipped, so you can fix a few rows and safely run it again.
The clever part
It reads every clue your files already carry
Four sources of truth, checked in order of reliability. Each one fills in whatever the last one couldn’t, and the table always shows you which source it trusted.
Embedded metadata
Audio tags in MP3/M4B files (including the SERIES and MVNM tags Audiobookshelf loves), series info inside EPUBs, and the hidden metadata in MOBI/AZW3 files.
Folder hierarchy
If part of your library is already shaped like Author\Series\Book, those folder levels are read as evidence — while junk folders like “Unsorted” or “New folder (3)” are recognized and ignored.
Smart filename parsing
Patterns like Author – Series 01 – Title or Title by Author are decoded, ALL-CAPS names are fixed, and “Sanderson, Brandon” becomes “Brandon Sanderson”. It even catches reversed Title – Author names.
Online lookup
Optionally checks Google Books and Open Library to confirm and polish titles and authors — and it only accepts a match when it’s confident, so lookups improve your names instead of scrambling them.
Built for the hand-off
A perfect head start for Audiobookshelf and Calibre
Audiobookshelf
The output uses Audiobookshelf’s recommended layout — Author\Series\01 – Title\ — so series order, authors, and multi-part books are recognized instantly. Point a library at the folder and watch it fill in correctly, with no per-book fixing afterward.
Calibre
Because every book sits in its own clearly named folder with the author one level up, Calibre’s bulk import gets clean titles and authors from the start — instead of hundreds of “Unknown” entries you’d be fixing for weeks.
Get it running in five minutes
Download & setup
It’s a single file — no installer, no background services, nothing phoning home. You need Python (free, from python.org) and one small library for reading audio tags.
2. Open Command Prompt and run: pip install mutagen
3. Download AudiobookOrganizer.pyw below and double-click it
Good to know: it copies rather than moves, so you’ll need enough free disk space for a second copy of your library — that’s the price of your originals staying completely safe. Questions? Get in touch.
