Eloshon
FRENNLDE

Tutorial

Convert your Shopify customers into a BigCommerce file

Atelier Démo is taking its customers from Shopify to BigCommerce. You convert an export where customers have tags, a company or no address, and see what BigCommerce receives.

Checked against the software on November 1, 2026

About the screenshots

The screenshots on this page come from another sample file: their names and numbers are not those of the text. The screens, the buttons and their position are the same.

Where you start

Atelier Démo’s Shopify customer export has 3 customers:

  • Emma, a florist in Antwerp: a company, the tags “pro, fleuriste”, tax exempt, subscribed to e-mails;
  • Ryan, in New York: the state is written as a code (NY), tag “particulier”;
  • Sofia: a name and an e-mail, no address.

What you will be able to do

  • know which Shopify tag becomes the BigCommerce customer group;
  • spot what BigCommerce does not receive: tax exemption, password, subscription;
  • read the written file, customer by customer.

Before you start

  • Eloshon Converter installed on your computer: see the Download page.
  • The customers export of your Shopify store, as a CSV file: Export from Shopify.
  • You do not need an Internet connection: the file is read and converted on your computer.

Step 1: Platforms

  1. Open Eloshon Converter. On the home screen, click the New conversion button below the title.
  2. Under Source platform, click Shopify.
  3. Under Target platform, click BigCommerce.
  4. Click Continue.

Step 2: File

  1. Drag your CSV file onto the Drop a CSV, JSON or .eloshon file, or click to browse area, or click the area to choose it.
  2. Read the card: File recognized · Shopify · customers, with 3 rows.
  3. Click Continue.

Step 3: Mapping

No row needs handling: the table opens on All. Three rows are worth a look.

  1. Find Tags: it goes to Customer Group, marked Safe.
  2. Find Tax Exempt: it is not carried by BigCommerce.
  3. Find Accepts Email Marketing: it goes to Receive Marketing Emails.
  4. Click Continue to review.

Step 4: Review

The counters show 3 customers and 3 rows, and the problem list is empty.

  1. Read the What will not transfer (BigCommerce limits) card: Customer passwords never migrate.
  2. Read the next line: 3 customer(s) imported NOT subscribed (Receive Marketing Emails = N). 1 had an explicit consent at the source (0 timestamped, 1 pending). Collect your own confirmation (double opt-in) on BigCommerce before sending anything.
  3. Click Continue.

The explicit consent is Emma’s: subscribed in Shopify, she arrives unsubscribed in the BigCommerce file, like the others.

Step 5: Export

  1. Under Destination folder, keep the suggested folder (Documents, unless you changed it in Settings) or click Browse….
  2. Under File name, keep the suggested name: your file’s name followed by _bigcommerce.
  3. Click Export.

An earlier export can be replaced

A file with the same name in that folder is replaced without asking. Accented letters in the name become _: “café” and “cafè” give the same file. Choose a name without accents, different for each export.

The result

The Conversion complete screen lists the files written and their folder; Open folder opens that folder. The CSV file has one row per customer, 3 here:

  • Emma: Company and Address Company = Fleurs Janssens, Customer Group = pro;
  • Ryan: State/Province = New York, spelled out from the code NY;
  • Sofia: her e-mail, first name and last name, with no address;
  • for everyone: Receive Marketing Emails = N.

Customer Group only receives the customer’s first tag: “fleuriste” is not written, and step 4 does not say so. For a customer with several tags, check Customer Group in the file before the import.

Messages you may see

  • This file does not match the chosen source platform. The button next to the message picks the right source.
  • Customer has no e-mail: it cannot be created. This is a blocking error: click Fix and type the customer’s e-mail.
  • Duplicate e-mail “emma.janssens@example.com”: only the last one is imported. This is a warning: two rows share this e-mail.
  • If the file cannot be written to the chosen folder, the The conversion stopped window shows Unrecognized format., even though your file is recognized: choose another folder or another name.

Importing the file into BigCommerce

The Converter stops at the file: it does not connect to your store. The steps to import it into BigCommerce, based on BigCommerce’s official help, are in Import into BigCommerce. Eloshon has not tried this import in a real store: after the import, compare a few records with your old store.

Other ways to do it

  • Your products are moving to BigCommerce too: Products: Shopify to BigCommerce. Orders, however, do not go to BigCommerce this way.
  • You often convert files of the same shape: at step 3, Save as template keeps your choices, and Apply a template applies them next time. See Mapping templates.
  • Your file is long: at step 5, tick the option that splits it into files of at most 500 rows. Each file repeats the header.

All Eloshon Converter help