Guides

Bulk listing comics on Whatnot with a CSV

By Winston, Comic Collector Enthusiast. 13 September 2026.

Whatnot's bulk upload is a CSV, and it is a much smaller file than eBay's. That is the whole story of listing comics there: the file is easy and the thinking is in what you do with a format that has nowhere to put most of what you know about a comic.

Where this comes from. Whatnot's own published bulk template and the controlled vocabularies on its Values tab, read on 25 August 2026, plus this product's own Buy It Now rows sitting live on Whatnot, built this way. What we have not done is run a live show off one of these files. Where that matters, this page says so rather than sounding confident.

The file: twenty one columns, and not one of them is an item specific

Here is the whole contract. If you have come from eBay File Exchange, count the columns and then notice what is missing: there is no publisher column, no series column, no issue number, no character, no creator, no era, no grade.

Put beside eBay, where C:Publisher, C:Series Title, C:Issue Number, C:Character and C:Artist/Writer each have their own column that buyers filter on, this is a blunt instrument. Nothing about a comic is filterable on Whatnot. The practical consequence is the next section.

Everything you know goes in the description, or it dies

Publisher, year, era, writer, artist, cover artist, characters, team, story title, grade: none of them has a column, so either you write them into the description or the buyer never sees them. This is the part of a Whatnot file that separates a considered upload from a lazy one, and it is worth doing by hand if you are only listing a few.

A shape that works, facts first and skimmable, with your standard blurb last:

Amazing Spider-Man #300
"Venom"
Marvel Comics · 1988 · Copper Age (1984-1991)
Creators: David Michelinie, Todd McFarlane
Cover: Todd McFarlane
Featuring: Spider-Man, Venom, Eddie Brock
Condition: VF

A buyer scanning a Whatnot listing on a phone reads the top three lines and nothing else, so the series and the issue go first and the boilerplate goes last. If the blurb does not fit inside the character limit, drop the blurb, not the facts.

Categories: name a leaf, never the parent

Whatnot's taxonomy is far shallower than eBay's. Where eBay separates Golden, Silver and Bronze Age, Whatnot has one Vintage bucket. The leaves are Anime & Manga, Comic Art, Vintage Comics, Modern Comics, Pop Culture Memorabilia under Comics & Manga, and Graphic Novels, Magazines, Rare & Vintage Books, New & Used Books under Books.

Two things to get right. The CSV wants the label, not the taxonomy slug, so it is Vintage Comics and never bronze_age_comics. And name a leaf rather than the parent: the Books category is marked as taking no inventory in the published taxonomy, so a file that names it should be expected to be refused rather than broadly categorised. Nobody here has made Whatnot refuse one to watch it happen.

Where does Vintage end? This product draws it at 1984, which is where the Copper Age starts, on the argument that everything from there is what a Whatnot buyer would call modern. It is a judgement call and yours may be different; nothing about the file stops you moving a row.

Condition is a word, not a number

Whatnot's ladder, in order: Graded, Gem Mint, Mint, Near Mint, Very Fine, Fine, Very Good, Good, Fair, Poor.

It is essentially the CGC scale with letters instead of numbers, so a raw comic maps onto it cleanly: 9.4 is Near Mint, 8.0 is Very Fine, 4.0 is Very Good. Two traps sit in here and both are worth knowing whether you use software or type the file yourself.

A slab has nowhere to go. There is no certification field anywhere in the CSV. The condition is Graded and the grading company, the grade and the certification number have to be carried in the title and the description or the buyer cannot check them.

A grade box full of prose asserts nothing. If the condition you have recorded reads "reading copy, some wear", that is a note and not a grade, and nothing should read a grade out of it. This product falls back to whatever the same comic claims on eBay, because two files describing one comic differently is its own defect, and it tells you which rows those were when it builds the file rather than while you are typing. If you are writing the CSV yourself, decide the word rather than letting a spreadsheet guess it.

The column that costs money: Shipping Profile

This is the one to read twice. Whatnot generates the shipping label, so the band you name is what the buyer is charged and what you are billed against. It is not the eBay weight field. eBay's weight is the item; Whatnot's band is the parcel, which means the comic plus the bag, the board and the rigid mailer. This product adds 3 ounces to every parcel for that. It is an estimate sized for a single comic, and it is not a per comic figure: a lot of a hundred gets the same three ounces, so what a box and its packing really add is a number worth weighing once and setting yourself.

Both of those notes are real, and neither is fixable by inventing a band name that Whatnot does not have. A lot of a hundred comics is eighteen pounds and change, over the top band, and every sale of it loses you the postage above the band. A lot of roughly thirty five to fifty comics falls in the gap and is quoted at your buyer as ten to fourteen pounds, which is how a lot stops selling.

The answer for both is the same and it is not clever: set those rows' shipping by hand in Whatnot after the import. Software should tell you which rows those are, by SKU and by real weight, before you upload rather than after a shipping label.

Photographs: eight, and they have to be public

Eight image columns, against eBay's 24. If you shoot ten photographs of a comic, as this product's own rhythm does, two of them are not going to Whatnot, so the order of the row matters: put the shots that sell the comic first.

The images must be reachable over https:// with no sign-in, because Whatnot fetches them itself during the import. This is the failure worth naming because it is silent: a file full of paths that are not public imports perfectly and produces drafts that can never be published. Nothing tells you at upload time. Check one listing after your first import before you build a habit on it.

Two files, not one: the show and the Buy It Now

The single most useful thing to understand about Whatnot is that it is not a second export of a box of photographs. It is a later stage of stock you have already listed somewhere else. In practice that is three files and one rule:

• The show file. Every row is an auction, built from what is still live on your other marketplace, in SKU order so the run of show walks the box in the order the comics sit in it. The Price column is the opening bid, not the asking price.
• The Buy It Now file. The leftovers after the show, as persistent listings at their asking price. Offers are a Buy It Now idea, so this is the file where Offerable can be TRUE.
• The end file for the other marketplace. Not a Whatnot file at all, and the one that costs you money if you skip it. See below.

Whatnot auctions have no reserve. The opening bid is the floor, full stop. So opening every lot at its listed price is a show nobody bids in, and opening everything at a dollar sells a forty dollar book for a dollar. A fraction of each listed price is the usual answer: at 0.4 a ten dollar book opens at four. Whatever you choose, choose it deliberately, once, for the whole show.

After the show, end the sold ones where they were listed

This is the part that turns into cancelled orders and account defects, and it has nothing to do with the CSV format.

Every comic that sold live in your show is still a live listing on eBay until you end it. The next eBay buyer who finds it buys a comic that is in somebody else's hands, you cancel, and eBay records the defect against you. Whatnot drift is what we call it, and it is the single most expensive habit in cross posting.

So the post show routine is two steps and the second is not optional:

1. Take the SKUs from Whatnot's post show report and turn the rest of the box into a Buy It Now file.
2. Take the SKUs that sold and end those listings on eBay the same day, which File Exchange will do in one upload.

One caveat on that second step, for the same reason as the Type column below: the end code File Exchange wants for a listing ended because it sold elsewhere has not been through a live upload from here either. Build a file with one SKU, upload it, and check that listing reads as ended in Seller Hub before you trust a file of forty.

This is also the reason the SKU column is worth caring about. A Whatnot row with no SKU cannot be matched back to an eBay listing at all, and reconciling a show by title, by hand, at midnight, is how comics get sold twice.

What we have not verified

The literal strings in the Type column. The published template's sample row shows a giveaway, and Buy It Now and Auction are the names Whatnot's help centre uses in prose, which is not the same as seeing them accepted. A one row test upload settles it, and it is what we would do before trusting a large file. If you are uploading your first file, upload one row first. That advice is worth following on any marketplace and it is worth following here.

And, as above, no live show has been run off one of these files by us. The Buy It Now rows are real and live; the auction half is built from the same template and the same vocabularies, and it has not met an audience yet.

If you would rather not type any of this

Point and Sell builds the show file, the leftovers file and the eBay end file from one box of photographs and your eBay active-listings report, writes the item specifics into the description in the shape above, maps your grades onto Whatnot's ladder, and puts a page in front of every one of those files naming what it left out and which rows will not behave: the ones with no public photo, and the lots whose parcel does not fit the band they will be labelled with.

Try it on a box · More guides for comic sellers

Sources

Whatnot's published bulk template (US, AU and NL, non-Coins) and the controlled vocabularies on its Values tab, read 25 August 2026; Whatnot's help centre for the image requirements, the absence of a reserve price, the title limit and the fact that Whatnot generates the shipping label. The column list, the category leaves, the condition ladder, the shipping bands and the character limits on this page are generated from the same constants this product writes its files with, so they cannot drift from the file you would actually get.