Bringing your Cardmarket inventory into Cardboardmarket
If you already sell on Cardmarket, you do not have to type your stock in again. You can export it to a file and bring that file here — usually a couple of minutes for a few hundred cards.
This guide covers both exports: your stock, which becomes listings, and your wants lists, which become wants.
What you need
A free browser extension called Cardmarket Stock Exporter, from the Chrome Web Store. It works in Chrome and in anything built on it — Edge, Brave, Opera, Vivaldi.
It is not ours. We did not write it, we do not maintain it, and we cannot support it. It is open source, and it does what it says: it reads a page you are already looking at and saves a file to your computer. Nothing is sent anywhere.
We never see your Cardmarket account. You export a file, you choose it here, and no login of yours comes near us. That is the part worth being sure of, and it does not ask you to take our word for anything — it is simply how the two steps are shaped.
1. Install the extension
Open the Chrome Web Store listing and add it to your browser.
Check the version: it must be 2.2.13 or newer. This is not a formality. Older versions only knew eleven card languages, so cards in any of the other six exported with the language left blank — and the extension's own bulk-update tool would then write them back to Cardmarket as German. An old version does not just import badly here; it can mislabel the stock on your own Cardmarket account.
2. Open your stock on Cardmarket
Sign in to Cardmarket and go to your stock page — the list of everything you have for sale. Let the page finish loading.
3. Export
Use the extension's export button. It reads the page and saves a CSV to your downloads folder.
The file is named after what it holds and when, something like cardmarket-stock-2026-09-19-en-Magic-v2.4.2.csv. Two things about that name are worth knowing before you go looking for it:
- It says stock or wants. Those are two different exports with different columns, and in a downloads folder they look almost identical. If you bring us the wrong one, we say so rather than failing every row of it.
- It says the game. The export is per game, so a seller with Magic and One Piece gets two files and imports each one.
4. Bring it here
Sign in at app.cardboardmarket.xyz and open your profile — the person icon at the top right, or Profile in the menu. Inside it, on the Selling tab, choose Import inventory and pick your file.
Before anything is written you get a preview: how many cards would be listed, how many rows we could not read, and why. That preview is not a forecast — it is the real import, run and then rolled back, so the numbers it shows are the numbers you will get. Nothing exists until you confirm.
What comes across, and what does not
| From the file | What we do with it |
|---|---|
| Quantity | How many copies the listing has |
| Condition | The same, on the same scale: M, NM, EX, GD, LP, PL, PO |
| Language | The language printed on the card |
| Price | The asking price, once |
| Card and set | Matched to our catalogue by Cardmarket's own product id |
The price is carried once and never updated again. Re-importing later will not quietly reprice three hundred live adverts — you did not ask for that, so it does not happen.
If you want the prices to move on their own
Any listing can follow Cardmarket's price: the low or the average, as it is or adjusted by a percentage or an amount, either way. It updates every night.
Just after an import is the best moment to decide. From your listings you can switch it on for several at once, or all of them, without opening each one — and it is still per listing, so the card you are holding out for stays exactly as you left it.
Your wants lists
The same extension exports your wants. Go to the page holding all your wants lists — not into one of them — and export from there. They all come out in one file, named cardmarket-wants-…. On the import screen choose Cardmarket wants lists CSV rather than the stock one.
A wants export identifies each card by Cardmarket's product id and usually carries no card name at all — in a real 252-row export exactly one row had one. That is fine, and it is the better match: the id is what we look the card up by, and it is more reliable than a spelling. A card we cannot find in our catalogue is reported back to you rather than guessed at.
Questions we get
Does this connect my Cardmarket account to Cardboardmarket? No. There is no connection between the two. You move a file by hand, and that is the whole link.
Will importing here change anything on Cardmarket? No. Nothing we do reaches your Cardmarket account. The only tool that writes back to Cardmarket is the extension's own bulk update, which is separate from exporting and which we never invoke.
What if my file is huge? Bring it anyway. Under 20 MB it is read while you watch, with the preview described above. Over that there is no preview — the file is stored and read in the background, and the page tells you so and lets you leave. Come back to it and the result is there.
It says my file is not a stock export. You have probably picked the wants file. Check the name: it says stock or wants.