Importing and exporting your collection

Wizbook is built to sit alongside whatever you already use, not to replace it. Your collection can come in from the big collection apps and go back out to any of them, so nothing you do here traps you.

The short version

Export a CSV from the app you use now.
In Wizbook, open Import & Export and pick the file.
Choose whether to merge it into the collection you have open, or make a new collection from it. If you pick new, Wizbook asks what to call it and offers the file's own name.
Read the log at the end. It lists every row that did not make it, grouped by the reason, and you can copy the whole thing.

Wizbook works out which app the file came from on its own, so there is no format to choose.

ManaBox

In ManaBox, go to your collection, then the menu, then Export, and choose CSV.
ManaBox files carry the exact Scryfall ID for each card, so printings come across precisely: the right set, the right collector number, the right art.
Condition and foil status come across too, so a lightly played foil stays a lightly played foil rather than becoming a fresh normal copy.
If your file has a purchase price column, Wizbook records it in the Card Buyer/Seller log, so you keep what you paid rather than losing it in the move.

TCGPlayer

From your TCGPlayer collection, use Export to CSV.
TCGPlayer writes foil status in a column called Printing rather than Foil. Wizbook reads either, so you do not need to edit the file.
Set names arrive in full rather than as three letter codes, which is fine: Wizbook matches on both.

Deckbox.org

In Deckbox, open your inventory and choose Export.
Deckbox exports use their own set naming in places. Where a set does not match, Wizbook still imports the card using another printing and tells you it did, rather than silently picking one.

Moxfield and Archidekt

Both export CSVs that Wizbook reads directly.
Archidekt files are usually deck lists rather than whole collections. Wizbook notices, and offers to build the deck for you once the import finishes.
Moxfield blocks other sites from fetching a deck by its link, so pasting a Moxfield URL will not work. Export the list, or copy the text and paste it in, and Wizbook will read it.

A plain list of card names

Anything shaped like 4 Lightning Bolt, one card per line, works. So does 4x Lightning Bolt and 1 Island (M20) 234.
Sideboard and maybeboard headings are recognised and skipped.

When a card does not come across

The import log groups every skipped row by the actual reason, which is usually one of these:

The name is not in English. Wizbook's card data is English only, so a card listed under its French or Japanese name will not match even though Wizbook has the card. List it by its English name and it comes straight in.
It is the back face of a double faced card. Those are filed under the front face, so ask for Delver of Secrets rather than Insectile Aberration.
It is a token, emblem or art card. Wizbook does not track those, so they are skipped rather than guessed at.
The set is one Wizbook does not have for that card. The card still imports, using another printing, and the log says so.

There is a Copy log button, and it pastes into a spreadsheet, which is the quickest way to fix a handful of rows and re-import just those.

Getting your collection out again

Export to TCGPlayer, Deckbox, ManaBox, Moxfield or Archidekt format, so it lands cleanly wherever you take it.
Export to Excel for the only one that is not a one way door: a workbook with a tab each for your collection, decks, binders, wishlists and your buy and sell log. Edit it in a spreadsheet, import it back, and nothing is lost.
Export as Wizbook JSON to keep a complete backup.
Decks export as Cockatrice .cod files.

You never need an account to do any of this, and there is no step where your collection stops being a file you can take with you.