How to Import Thunderbird Contacts to Gmail: CSV, VCF & Bulk Methods

Address Book is an essential part of emailing; every user wants these contacts and address lists along with their emails. In practical life, there are a lot of instances that initiate users to import Thunderbird Contacts to Gmail. Gmail, being a webmail platform, offers some advantages that users love and hence need to import. Moreover, Gmail, being a Google product, is backed by reliability and technological advancements. Whatever the reason, if you want to import Thunderbird Contacts to Gmail, then this blog is here to guide you.

Reasons to import Thunderbird Contact to Gmail are listed below:

1. Access from anywhere: Gmail can be accessed from any device as long as you need an internet connection. If you are using Thunderbird, you will have to import all your contacts to Gmail. After that, users can access their contacts from anywhere, whether using a computer, tablet, or smartphone.

2. Cloud storage: Gmail also offers cloud storage for emails, which can be accessible from any device with an internet connection. Importing Thunderbird emails to Gmail also ensures that they are backed up and can be retrieved from anywhere.

3. Gmail Advanced features: Gmail offers many advanced features, such as powerful search capabilities, spam filtering, a friendly interface, ease of use, etc., which are rarely found in Thunderbird.

Overall, users are moving from Thunderbird to Gmail for their convenience.

Can You Import Thunderbird Contacts Directly into Gmail?

No. Thunderbird contacts are normally exported from the Thunderbird Address Book as a CSV or VCF file and then imported into Google Contacts. There is no need to add each contact manually. This method is suitable for transferring a small or moderately sized address book. For large contact lists, you may need to split the export into multiple files.

What You Need Before Importing Thunderbird Contacts

• Thunderbird with access to the required Address Book
• The contacts you want to transfer
• CSV or VCF export file
• Google account
• Access to Google Contacts

Enough space within your Google Contacts account

How to Export Thunderbird Contacts to Gmail?

Following are the methods to import Contacts from Thunderbird to Gmail by manual way or a professional tool.

Method 1: Export Thunderbird Contacts to CSV

1. Open Thunderbird.
2. Open Address Book.
3. Select the address book containing your contacts.
4. Select the contacts you want to export.
5. Choose Export.
6. Select CSV as the export format.

Choose a location and save the file.

Method 2: Export Thunderbird Contacts to VCF

1. Open Thunderbird Address Book.
2. Select the required address book.
3. Select the contacts.
4. Choose Export.
5. Select vCard/VCF.
6. Save the file.

Google’s currently supports importing both CSV and vCard files.

Import Thunderbird Contacts into Google Contacts

1. Open Google Contacts.
2. Click Import.
3. Select the CSV or VCF file.
4. Choose the file exported from Thunderbird.
5. Click Import.

Check the imported contacts.

How to Import a Large Thunderbird Address Book

Google Contacts may have problems when importing more than 3,000 contacts at once. If your Thunderbird address book contains more than 3,000 contacts, split the contacts into multiple CSV files and import them in separate batches.

Google also has a limit of 25,000 contacts. Therefore, check your existing Google Contacts before importing a very large Thunderbird address book.

Common Problems When Importing Thunderbird Contacts

Importing Thunderbird contacts into Google Contacts is usually straightforward, but you may encounter problems with exporting, file formatting, missing information, duplicates, or large contact lists. The following solutions can help resolve the most common issues.

Thunderbird Export Option Is Missing

If you cannot find the Export option in Thunderbird, make sure you are working in the Address Book rather than the main email window.

How to fix it:

1. Open Thunderbird.
2. Go to Address Book.
3. Select the specific address book that contains your contacts.
4. Select the contacts you want to export, if required.
5. Look for the Export option in the available actions or context menu.
6. Choose CSV or vCard/VCF as the output format.

If you are viewing a combined or address-book overview rather than a specific address book, the export option may not appear as expected. Selecting the actual address book containing your contacts can resolve the problem.

Tip: Thunderbird’s interface can vary between versions, so avoid relying on an exact menu location if the option looks different on your installation.

Google Contacts Rejects the CSV File

Sometimes Google Contacts may not accept a CSV file exported from Thunderbird. This can happen because of an incorrectly formatted file, an incomplete export, unsupported contact data, or a problem with the file itself.

How to fix it:

• Make sure the CSV file was exported correctly from Thunderbird.
• Open the CSV file in a spreadsheet application and check that the contact information is present.
• Do not unnecessarily change or remove the column headers.
• Try exporting the contacts again from Thunderbird.
• If you have a large file, try importing a smaller batch first.
• Make sure you are importing the file through Google Contacts → Import.

If a smaller file imports successfully but the complete file does not, the problem may be related to the size or content of the original contact file.

Tip: Keep a backup copy of the original Thunderbird contacts before making changes to the CSV file.

Some Contact Information Is Missing

After importing Thunderbird contacts into Google Contacts, you may notice that some information is missing or appears in a different field.

This can happen because Thunderbird and Google Contacts do not necessarily use the same contact fields or structure. For example, a custom field or less-common Thunderbird contact field may not have a direct equivalent in Google Contacts.

How to fix it:

1. Open the imported contact in Google Contacts.
2. Check the available fields for the missing information.
3. Compare the contact with the original Thunderbird entry.
4. If the information is important, manually add it to the appropriate Google Contacts field.
5. For large migrations, test a small group of contacts before importing the complete address book.

It is a good idea to test a few contacts first, especially if your Thunderbird address book contains custom fields or additional contact information.

Duplicate Contacts Appear

Duplicate contacts can appear when the same Thunderbird contacts already exist in Google Contacts or when the same CSV/VCF file is imported more than once.

For example, if you import the same Thunderbird contact file twice, Google Contacts may contain duplicate entries.

How to fix it:

• Check your Google Contacts before starting the import.
• Avoid importing the same CSV or VCF file multiple times.
• If duplicates appear, review the duplicate entries.
• Use Google Contacts’ available duplicate-management or merge options where appropriate.
• For a large address book, keep track of which contact files have already been imported.

Tip: If you are unsure whether an import was successful, check Google Contacts before importing the same file again. This can help prevent unnecessary duplicates.

More Than 3,000 Contacts

Large Thunderbird address books can require additional preparation. Google currently recommends splitting files when importing more than 3,000 contacts at once. Google also states a maximum of 25,000 contacts in Google Contacts.

How to handle a large Thunderbird address book:

1. Export your Thunderbird contacts to CSV or VCF.
2. If you have more than 3,000 contacts, divide them into smaller batches.
3. Import each batch separately into Google Contacts.
4. Check the imported contacts after each batch.
5. Make sure you do not accidentally import the same batch twice.

For example, instead of importing 6,000 contacts in one file, you could divide them into two smaller files and import them separately.

Method 3: Automated Way to Export Thunderbird Contacts

The manual CSV or VCF method works well for smaller address books, but exporting and managing a large number of Thunderbird contacts can become time-consuming.

Regain Thunderbird Contacts Converter provides a convenient way to export Thunderbird contacts in bulk. It can be useful when you need to handle a large address book without manually processing contacts individually.
Free Download100% Secure Buy NowPrice: $29

• You can directly import Thunderbird contacts to Gmail by simply adding Thunderbird-created MBOX files.
• This utility can also convert MBOX to PST, EML, EMLX, PDF, and HTML-like file formats.
• Along with Gmail, it also offers exporting Thunderbird to Microsoft 365, Exchange Server, Outlook.com, Yahoo Mail, Amazon WorkSpace, and others.
• There is no restriction on the size and number of MBOX files.
• It is a speedy utility, and it completes importing very fast.
• Users also get a free demo version of this utility to test and be satisfied with the tool before purchasing.

See How Easy It Is to Import MBOX to Gmail:

• Install and launch the Regain MBOX Migrator (MBOX to PST Converter).
• Browse the Thunderbird-created MBOX file from the local machine to add.
• Now, the software will preview the content present with the added file.
• Select the Cloud Migration option from the ribbon bar and select Gmail as the target.
• Enter the Gmail login credentials as requested, and the process of importing MBOX to Gmail will start.

Video Tutorial for Thunderbird Contacts to Gmail Migration Using Regain Software – Watch Now!

Wrapping Up:

There are multiple reasons to import Thunderbird contacts to Gmails and these reasons vary from person to person.  A few methods are explained in this blog to complete this export. Moreover, a professional utility developed by Regain Software is also described in this blog. Users can download the free trial version of the software and test this utility before purchasing.

Frequently Asked Questions:

Q1. Can I import Thunderbird contacts directly into Gmail?

Ans. No. You normally need to export your Thunderbird contacts as a CSV or VCF file and then import the file into Google Contacts. Once imported, the contacts become available in your Google account.

Q2. How do I export Thunderbird contacts to CSV?

Ans. Open Thunderbird’s Address Book, select the address book containing your contacts, choose Export, and select CSV as the file format. Save the CSV file to your computer, then import it into Google Contacts.

Q3. Can I export Thunderbird contacts to VCF?

Ans. Yes. Thunderbird supports exporting contacts in vCard (VCF) format. Open the Address Book, select the required contacts, choose Export, select VCF/vCard, and save the file. You can then import the VCF file into Google Contacts.

Q4. Can I import Thunderbird contacts without Thunderbird installed?

Ans. If you already have your Thunderbird contacts saved as a CSV or VCF file, you can import them into Google Contacts without Thunderbird installed. However, if the contacts are still stored only in Thunderbird, you need access to Thunderbird or the relevant profile data to export them.

Q5. Can I transfer more than 3,000 Thunderbird contacts to Gmail?

Ans. Yes, but Google recommends splitting more than 3,000 contacts into multiple files and importing them separately. Google Contacts also has a limit of 25,000 contacts, so check your existing contacts before transferring a very large address book.

Q6. Why are some Thunderbird contact details missing after import?

Ans. Some Thunderbird contact fields may not have a direct equivalent in Google Contacts. As a result, certain information may be placed in a different field or may not transfer as expected. Review the original Thunderbird contacts if specific information is important.

Q7. Why am I getting duplicate contacts in Google Contacts?

Ans. Duplicate contacts can occur if the same Thunderbird contact file is imported more than once or if the contacts already exist in Google Contacts. Review the imported contacts and use Google Contacts’ duplicate management options to merge matching entries.

Q8. Will importing Thunderbird contacts delete them from Thunderbird?

Ans. No. Exporting Thunderbird contacts creates a copy of the contact information. Importing that CSV or VCF file into Google Contacts does not normally delete the original contacts from Thunderbird.

Q9. Can I transfer Thunderbird contacts to Gmail without adding them individually?

Ans. Yes. You do not need to add Thunderbird contacts one by one. Export them as a CSV or VCF file and import the file into Google Contacts to transfer multiple contacts at once.

Q10. What is the easiest way to export a large Thunderbird address book?

Ans. For a small address book, Thunderbird’s built-in CSV or VCF export is usually sufficient. For a large address book, manually exporting and managing multiple files can be time-consuming. Regain Thunderbird Contacts Converter provides a convenient way to export Thunderbird contacts in bulk and simplify large contact exports.