Identifier Converter

Bulk-convert between ASIN (Amazon Standard Identification Number), UPC, EAN, and ISBN identifiers across Amazon marketplaces. Paste a list or upload a file and download the mapped results.

Difficulty: 🟡 Intermediate · Reading time: ~7 min

Open this page in your dashboard: Go to Identifier Converter →

📋 Overview

The Identifier Converter is a bulk-conversion tool built into the Sourcer page. It lets you convert between Amazon product identifiers. ASIN, UPC, EAN, and ISBN, in large batches. Whether you have a supplier spreadsheet full of EAN codes and need the matching ASINs for a specific marketplace, or you need to reverse-lookup UPCs from a list of ASINs, the Converter handles it in seconds.

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Accessing the Converter

1. Log in to your SellerMagnet dashboard.

2. Navigate to Sourcer in the left menu.

3. Click the Converter tab at the top of the page.

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Input Methods

SellerMagnet Identifier Converter

The Converter accepts identifiers through two channels, displayed side by side:

Text Input

Feature	Details
Input field	Multi-line textarea with monospace font
Accepted formats	One identifier per line
Accepted types	ASIN, UPC, EAN, ISBN-10, ISBN-13
Max per batch	Depends on your subscription plan (typically 500-5,000)

Paste your list directly. Each line should contain a single identifier. The system auto-detects the identifier type.

File Upload

Feature	Details
Drop zone	Drag-and-drop area or click to browse
Accepted formats	.csv, .txt, .xlsx
Max file size	5 MB
Column detection	Automatically identifies the column containing identifiers

Pro tip: When using a CSV file, ensure the identifier column has a clear header like "ASIN", "EAN", or "UPC". This helps the auto-detection work reliably even in multi-column files.

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Configuration Options

Before running the conversion, configure the following:

Setting	Description
Target marketplace	The Amazon marketplace to look up identifiers against
Output format	Choose which identifier types to include in the results
Include product info	Optionally enrich results with product title and image

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Running a Conversion

1. Paste identifiers into the text field or upload a file.

2. Select the target Amazon marketplace from the dropdown.

3. Click the Convert button.

4. A progress indicator shows the conversion status.

5. Results appear in a table below the input section.

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Results Table

The results table displays one row per input identifier:

Column	Description
Input ID	The original identifier you provided
ASIN	Amazon Standard Identification Number
EAN	European Article Number (13 digits)
UPC	Universal Product Code (12 digits)
ISBN	International Standard Book Number (when applicable)
Status	Success, Not Found, or Error
Product Title	Listing title (if product info enrichment is enabled)

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Statistics Bar

Above the results, a statistics bar summarizes:

Stat	Description
Total input	Number of identifiers submitted
Matched	Successfully converted identifiers
Not found	Identifiers with no matching Amazon catalog entry

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📤 Exporting Results

Click the Export button to download results as a CSV file. The export includes all columns from the results table, making it easy to import into your inventory management system, supplier negotiation spreadsheet, or listing tool.

Tip: The exported CSV uses UTF-8 encoding, which preserves special characters in product titles across all languages and marketplaces.

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🎯 Realistic Example

Scenario: You receive a wholesale price list from a European distributor with 200 EAN codes. You need to find the matching ASINs on Amazon.de to evaluate profitability.

1. Open the Converter tab.

2. Copy all 200 EAN codes from the spreadsheet and paste them into the text area.

3. Select Amazon.de as the target marketplace.

4. Click Convert.

5. In about 15 seconds, the results table populates. 187 EANs match an ASIN, 13 return "Not Found" (meaning the product is not yet listed on Amazon.de).

6. Export the CSV and import the matched ASINs into the Sourcer's Overview tab to run profitability analysis on each one.

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⚠️ Common Mistakes to Avoid

Mistake	Why It Hurts
Mixing multiple identifier types in one batch without headers	The auto-detection may misclassify some identifiers
Uploading a file with merged cells	Parsing fails on merged-cell spreadsheets; flatten them first
Forgetting to select the correct marketplace	ASIN-to-EAN mappings vary by marketplace; always match your target
Including leading zeros in a text file opened in Excel	Excel strips leading zeros from UPC/EAN numbers, use .csv format
Submitting duplicates	Wastes processing time; deduplicate your list before converting

## ✅ Best Practices

1. Deduplicate your list before uploading: Remove duplicate identifiers to speed up conversion and avoid wasted lookups.

2. Use the correct marketplace: Identifier mappings are marketplace-specific. A UPC may map to different ASINs on Amazon.com vs. Amazon.de.

3. Combine with the Sourcer Overview: After converting, paste matched ASINs into the Sourcer's search to run full profitability analysis.

4. Save exports for future reference: Keep converted files organized by supplier and date for easy re-evaluation when prices change.

5. Handle "Not Found" results: Products with no ASIN match may represent listing opportunities. Consider creating a new listing for those EANs.

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❓ FAQ

How many identifiers can I convert at once?

The batch limit depends on your subscription plan. Starter plans support up to 500 identifiers per conversion; Professional and Enterprise plans support up to 5,000.

Does the converter work across all Amazon marketplaces?

Yes. Select any marketplace connected to your Seller Central account. The converter queries Amazon's catalog for that specific marketplace.

Why do some identifiers return "Not Found"?

The product may not be listed on the selected marketplace, or the identifier may be incorrect. Double-check the identifier and try a different marketplace if appropriate.

Does each conversion consume search credits?

Converter lookups use a separate quota from standard Sourcer searches. Check your plan details for the exact allocation.

Can I convert ASINs to EANs (reverse lookup)?

Yes. The converter works bidirectionally. Enter ASINs and the results will include the mapped EAN, UPC, and ISBN where available.

What file formats are supported for upload?

CSV, TXT, and XLSX files up to 5 MB. Ensure identifiers are in a single column with a clear header row.

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➡️ What's Next?

Product SourcerChrome Extension