
Check your eBay bulk-upload CSV before Seller Hub rejects it.
RowCheck reads the CSV or XLSX you're about to upload in Seller Hub and lists each problem it finds by row and column, with how to fix it. Apply the safe fixes and export a corrected CSV before you upload. For eBay.com (US). Your file never leaves your browser.
Or write to ceo@maw2in.com. One message when it can be installed, nothing else.
- File never uploaded
- Row-by-row fix hints
- Free checks
- One-time Pro from USD 9

One bad cell and the upload fails.
Bulk listing saves hours, until Seller Hub rejects the file and you're hunting through hundreds of rows.
Seller Hub's results file tells you what failed after you upload. Then you fix the sheet and upload again.
Hidden characters before the header, prices with commas, UPCs turned into 1.2E+11.
Some rows go live and some don't, and you're left working out which failed and why.
How RowCheck works
Click the toolbar icon and load your CSV or XLSX. It's read inside the extension page.
Each issue with its row, column and a plain fix. Map your columns once and they're remembered.
Apply the safe fixes and export a corrected CSV for Seller Hub.


What RowCheck checks in your eBay file
Problems are listed where they are, with a hint on how to fix each one.
Stray characters Excel adds above eBay's first template line (the INFO line), price formats, the basic condition words, picture-link separators.
Currency symbols and decimal commas, UPC/EAN/ISBN length and scientific notation, condition IDs.
New listings get the full checks; Revise, Relist and End rows are checked for what each one needs.
Empty required columns, missing Category IDs, item-specific column prefixes.
Files are read in your browser. No account, no server, no tracking.
RowCheck pricing: free, or one-time Pro
Try every check for free on your real file. Pro is only needed to export more than 10 rows.
Free
No account. No trial clock.
- Load your Seller Hub CSV or XLSX
- Full problem list with fix hints
- Apply the safe fixes
- Export up to 10 rows
Pro One-time
One-time, pay what you want from USD 9. No subscription. 30-day refund.
- Everything in Free
- Export all rows
- Keeps working if Gumroad can't be reached
Pro is a licence key sold on Gumroad by MAW2IN. You paste the key into the extension to unlock Pro.
Your listings stay on your computer.
RowCheck reads and checks your file inside the extension page. Nothing is uploaded to us or anyone else.
- File never uploadedChecked in the browser, exported back to your Downloads folder.
- No trackingNo account, no ads, no analytics, no server of ours.
- Honest about eBayeBay still validates every upload, and a file that passes RowCheck can still be rejected.
Exactly what happens with your data
- What is stored
- Your column mappings and licence key, in local extension storage.
- The only network call
- The Pro key check with Gumroad (
api.gumroad.com): the key and product ID only, when you activate it and about once a week after. - Honest limits
- Built for eBay.com (US) Seller Hub templates. Variation (multi-SKU) listings aren't supported. The checks were tried on hand-built sample files, not on files downloaded from eBay.
RowCheck FAQ
Is my file uploaded anywhere?
No. RowCheck reads the file inside the extension page. The only network call is the Pro licence check with Gumroad.
Does a file that passes RowCheck always upload?
Not always. eBay still validates every file when you upload it. RowCheck catches common format and field problems before you get there. The checks were tried on sample files we built by hand from eBay's templates, not on files downloaded from eBay.
Does it handle variation listings?
No. Variation (multi-SKU) listings aren't supported yet.
Does it work with File Exchange files?
File Exchange is now Seller Hub Reports > Uploads. RowCheck checks files in that template format.
Which eBay sites does it support?
The US site (eBay.com), including eBay Motors headers, and the Seller Hub upload templates.
What does the free version do?
Everything except the full export: load a file, see each problem it finds with fix hints, apply safe fixes and export up to 10 rows.
Is Pro a subscription?
No. Pro is a one-time key from USD 9 (pay what you want), sold on Gumroad by MAW2IN, with a 30-day refund.
A one-person studio, MAW2IN.
Each extension does one job, keeps your data on your device and is sold for a one-time price. Every e-mail is read and answered: ceo@maw2in.com.
Fix the file before you upload it.
RowCheck is in store review. Send us a note and we'll e-mail you once when you can install it.