How to organise a digital library

Short answer: one folder, flat, files named Author - Title, correct metadata inside each file, synced to a cloud folder you own. Everything else is optional.

Keep the folder tree shallow

The instinct is to build a hierarchy: genre, then author, then series. Resist it. Deep trees are a chore to maintain, they break the moment a book fits two categories, and no reading app cares about them anyway.

What works instead:

Books/
        Ursula K. Le Guin - The Dispossessed.epub
        Ursula K. Le Guin - The Left Hand of Darkness.epub
        Italo Calvino - Invisible Cities.epub
      Audiobooks/
        Author - Title/
          book.m4b
          cover.jpg

One level for ebooks, one folder per audiobook because audio often arrives as several files. If the collection is enormous, split alphabetically (A-F, G-M) rather than by subject. Subject is what search and tags are for.

Metadata matters more than filenames

Your reading app builds its library from the metadata inside each file, not from what you called the file. A book whose internal title is “calibre_output_final_2” will show up that way no matter how neatly you named it on disk.

So spend your effort here instead. Calibre, free on desktop, edits title, author, series and cover in bulk and can fetch correct metadata from online sources. An hour with it is worth more than a week of folder rearranging. Three fields carry almost all the value:

• Author, consistently: pick Le Guin, Ursula K. or Ursula K. Le Guin and never mix them.
• Title, without the series number jammed into it.
• Series and number in their own fields, so books sort in reading order.

Add a cover while you’re there. A shelf of grey placeholders is hard to navigate visually, and covers are how most of us actually recognise a book.

Use tags, not folders, for subjects

A book can be science fiction, translated, and something you read for work. Folders make you choose one; tags don’t. Most reading apps let you group by author, series, format, or your own labels, on top of whatever the folder structure is. That is where the organising should live, because it costs nothing and changes freely.

Lectern takes this further by grouping the library automatically and offering search and filters over it, so the folder on disk can stay simple. A tidy flat folder plus a good library view beats a hand-built tree that only you understand.

One format per book, usually EPUB

Keeping four formats of the same title triples your storage and doubles your confusion about which one you last read. Pick EPUB as the default, keep the PDF only when layout genuinely matters (art books, sheet music, technical manuals with diagrams), and convert the rest. The reasons are in EPUB vs PDF.

Where you do keep duplicates, put the alternate format in the same folder with the same base name, so they sort together and it’s obvious they’re one book.

Make it portable and backed up

Put the folder in a cloud service you already use. That gives you a backup, access from every device, and a library that isn’t tied to any one app. Which service matters less than people think; the trade-offs are in Drive vs Dropbox vs Nextcloud.

Two habits worth having:

1. A second copy somewhere else. An external drive updated twice a year is enough. Cloud sync propagates deletions; a backup doesn’t.
2. Export your highlights occasionally. Books are replaceable; your notes on them are not.

Growing the library

Once the structure exists, adding to it should be effortless. Two routes worth setting up:

• OPDS catalogues, which are like RSS feeds for books. Browse and download straight into your reader, no browser involved. See what is OPDS.
• A Calibre library on a home server, if you already run one. Calibre-Web turns it into something your phone can browse.

The test of a good library isn’t how it looks. It’s whether you can find a book you half-remember in under thirty seconds, and whether all of it still opens on a device you haven’t bought yet.

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