FeeTrail
US USD

Changing market changes currency and fee rules. Common values are kept; platform-specific choices may reset.

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FeeTrail Bulk

Browser-based CSV profit calculation

Upload, map, validate and calculate up to 5,000 rows locally. Valid rows continue even when other rows need correction.

  1. 1 Upload
  2. 2 Map columns
  3. 3 Validate and calculate
  4. 4 Review results

Choose a CSV file to begin.

1

Upload locally

CSV contents are read by this browser and sent only to a local worker.

Mapping works on phones, but a desktop browser is easier for large files and wide result tables.

Drop a CSV here, or choose one from this device.

Privacy and support

The file stays in this browser

Parsing and calculation run in a Web Worker. FeeTrail does not require an account or a seller-platform connection, and the CSV is not uploaded by this page.

Current batch schedules cover every published V1 platform profile. Rows must specify seller profile and category IDs whenever a platform has more than one matching schedule. Dynamic buyer fees such as Vinted Buyer Protection require the exact checkout override column for a precise buyer total.