Importing Leads and Contacts from a file

There are several ways to get your Lead data into Atmos.

The first and most commonly used is Atmos’s Lead Importer. Navigate to the Lead Importer by clicking your name in the upper left of Atmos, then choose Import Leads & Data. Using the Lead Importer, you can import (and update) Leads from a .CSV or Excel file or perform a one-time data migration from an old CRM product/service.


Lead Importer

Choose one of the three options to get started. You can import by upload via CSV by browsing to that file on your computer, by dragging and dropping a file onto the “Upload a CSV” option box, copying and pasting directly from Excel, or complete an import from another CRM tool :


Formatting your File

Make sure your file is in either .csv or .xlsx/.xls Excel format (depending on which import option you choose).
Make sure the first row in your spreadsheet is a header row (i.e. a row containing column names). Atmos will use those names to guess the appropriate field assignment automatically. (You can always adjust the field assignment if needed.).
To download an example .csv file, click here.
Use + country code prefix when importing phone numbers to ensure the correct dial code is added in. For example, instead of (888) 888-8888 use +18888888888 because +1 is the dialing code for the US. If country code is not specified, Atmos will fallback to the default country code that’s automatically detected and can be changed only by emailing
There is a limit of 15MB per CSV upload. Larger CSV files will need to be broken down and uploaded separately.
You can’t currently import opportunities, notes, calls, emails, SMS, and other non-lead data points through the Lead Importer. If this data resides in another CRM, consider using our CRM migration tool instead or submit a support ticket by clicking the (?) in the top right corner of the page.
If you have a contact with multiple email addresses and/or phone numbers, use a semicolon ; to separate these values. (e.g.;
To update a multiple-choice custom field using the importer, place a semicolon ; between each “choice” in the same row. (e.g. If we had a multiple-choice custom field “Qualifications” for John Walker: Sales Team Member; Manager)

Assigning Fields

After you finish uploading your data, you’ll need to assign each column from your spreadsheet to a field in Atmos. You’ll see the column headers in the first column and Sample Data in the second, so you can easily assign the fields. 

If a column is a lead or contact custom field make sure to prepend the column name with custom for Atmos to automatically assign the fields.

To assign the data from your spreadsheet to the right place in Atmos, use the dropdowns in the Mappable Fields column. Click Save and Continue to move on to the next page.

Map to fields in Atmos

If you’re an Admin (learn more about Atmos’s Roles & Permissions feature) and Atmos couldn’t recognize some of the columns in your spreadsheet, they’ll show up as Custom Field suggestions.

If you choose to map a column to a Custom Field suggestion, Atmos will automatically create that new Custom Field when you start your import. These Custom Fields will be created as a “Text” type, but you can change that later in the Customizations settings. Learn more about Custom Fields.

Note: If you need to import a Lead Status or choices-type Custom Field, you will need to create these in Atmos before your import. Go to the Customizations section and make sure all the Statuses and Choices exist before proceeding with the import.

Grouping Contacts and Addresses

If you have contacts or addresses belonging to the same lead in multiple rows, you can group them together based on any column in your spreadsheet. Atmos automatically determines how many unique values each column contains and informs you how many leads all your rows would be grouped into. For example, if you have a following spreadsheet:

And choose to group rows by “Company”:

Import status page

The end result will be:

Import status page

Are the Contacts/Addresses for each Lead all on the same row?
Then, choose ‘+ Add another Contact/Address’ and decide which columns to map to.

Are the Contacts/Addresses pertaining to the same lead spread across multiple rows?
Then, group the rows together after you click ‘Next’.

Note: Grouping options only contain columns that actually have some repeating values. If all of the values in a given column are unique, grouping would have no effect on the end result. If all of the columns in your spreadsheet contain unique values, grouping options will not be available since the outcome of the import would not differ no matter which column you’d group by.

Duplicate Detection

The Lead Importer can check for existing leads, so you can prevent duplicates and update leads that are already in Atmos.

When you get to the “Options” step, you can check if Leads already exist by using a comparison field. If you are using this option, you need to pick a field that has a unique value for each of your Leads (e.g. Company Name, lead ID, or a Custom Field containing your internal system’s customer ID). When the Importer runs, it will use the comparison field to determine if each lead from your spreadsheet is a new lead, or an existing lead.

From there, you can choose how you’d like the Importer to handle the leads that match based on the comparison field. You can:

Only add missing information. (Information will only be added to blank fields.)
Replace the existing lead information entirely. (Note: this re-writes the lead data and cannot be undone.)
Skip the lead. (After the import, you’ll get a spreadsheet with all of your skipped leads for review.)
You can also select how you’d like the importer to handle non-matching leads. You can:

Create new leads. (Recommend if you want to import and update from the same spreadsheet.)
Skip new leads. (Recommended if you are trying to only update, rather than import.)

Confirmation for a full import

Viewing Imported Leads

After you kick off an import, you can stick around to observe its progress or navigate away and see the status of the import later by going back to the bottom of the “Import Data” page and clicking on “View Summary” to view this imported list of leads.

Manual imports and imports from another CRM will not show on this page.

By default, this will only show your imports, but you can click on “View everyone’s imports” to see imports performed by another user.

You can set up Roles & Permissions to limit your team’s ability to bulk edit, delete, or import Leads.

Confirmation for a full import

When the import finishes, the summary page shows how many Leads were created, how many were skipped, and how many failed validation. You can then choose to:

Undo the import, deleting all of the Leads it created.
Download a CSV containing all of the rows from the original spreadsheet that were detected as duplicates and skipped.
Download a CSV containing all of the rows that failed validation (e.g. because it contained invalid phone numbers, emails, etc.)

Resolving Validation Errors

The CSV of Leads that failed validation contains all the columns that your original spreadsheet contained plus a Validation Errors column that explains which of the values are invalid and why. The CSVs of skipped and failed Leads are only available for 30 days from the time of the import.

If you are reverting an import some leads might not have been reverted due to Lead changes after the initial import – see more here.

Full import in progress

Reverting an Import

Mistakes happen. Sometimes, you’ll perform an import that you’ll want to revert.

There are a few ways to revert an import in Atmos, depending on how the import was performed:

Importing from a CRM:

If you would like to revert an import you created using our “Import from a CRM” feature, please contact
Manually creating a Lead:

To delete a Lead you manually created, you can scroll to the bottom of that Lead’s page and click on “Delete Lead”
Importing via .CSV or Pasting from Excel:

Go to the Import Leads & Data page click on View Summary next to the import you’d like to revert. On the next screen, click on the Undo button to revert this import as shown below:

The View Summary button is useful to learn more about a given import, undo it, view the Leads it created, or download a CSV file with the rows that failed to import due to invalid or duplicate data.

Lead was not reverted

If changes have been made to Leads since they were imported, they will not be reverted. That means if you imported a lead, and then changed their name, sent an email address, or performed any other activity on that lead – revert for that lead will be skipped.

Full import in progress