BlueprintLab Tools
JAEN
All tools / Commerce / CSV checks

PREFLIGHT CHECK

Mercari Shops 3,000-character description checker

Find product descriptions longer than the documented 3,000-character limit before Mercari Shops import.

Check CSV

🔒 Analysis runs in your browser; the file itself is not sent to BlueprintLab.

What this tool checks

  • Description length
  • 3,000-character limit
  • Rows over the limit

What it cannot determine

This unofficial checker covers only rules that can be verified in the browser. Live account settings, remote server state and later service-side validation remain authoritative.

About this tool

Mercari Shops 3,000-character description checker is a free browser-based preflight checker from BlueprintLab Tools. Find product descriptions longer than the documented 3,000-character limit before Mercari Shops import.

No sign-up is required and the CSV content is processed locally in your browser.

How to use

  1. Choose the target CSV file.
  2. Run the check.
  3. Review detected issues and fix the source file if needed.