DataDoctor

Runs entirely in your browser — no uploads, no saved snippets, no public links.

Paste a file, inspect the issues, export reviewed output.

HubSpot import preflight

HubSpot CSV Import Checker

Check HubSpot contact CSVs for email identity, duplicates and invalid email values before import.

Paste contacts CSV, load the contacts sample, or upload a local file.

Next workflow

Continue the preflight

Mailchimp CSV Checker

Check a similar email-list import workflow.

CSV Duplicate Finder

Inspect duplicate email rows before upload.

CSV Cleaner

Export a cleaned contacts file.

After the tool runs

HubSpot CSV Import Checker review guide

Use the tool above first. The supporting notes below help you interpret the result, fix the right issues in the right order, and choose the next DataDoctor tool without pushing SEO content above the actual task.

Best input

checking HubSpot contact CSV files before a CRM import creates bad or duplicate contacts.

Output to keep

Keep a before/after import file plus a short list of rows changed for the target platform.

Next check

Run a generic CSV data quality check before final upload when the platform-specific checker passes.

What it checks

HubSpot CSV Import Checker for real data work

HubSpot CSV Import Checker focuses on the rules a real platform usually enforces: required headers, identity fields, duplicate keys and value formats.

  • Email column presence
  • Missing email values
  • Invalid email format
  • Duplicate email addresses

Fix these first

Common errors to review before downstream work

Most failures come from small file issues that become expensive only after an API call, import job or spreadsheet cleanup. Fix blocking errors first, then re-run the same tool before moving forward.

  • No Email column
  • Blank contact emails
  • Case variants of the same email
  • Malformed addresses

Recommended workflow

Run the check in this order

Use the report to fix platform-blocking issues first. After those pass, run broader CSV checks for blanks, type drift and suspicious rows before uploading.

  1. Step 1

    Paste the contact CSV

  2. Step 2

    Run the HubSpot check

  3. Step 3

    Fix email column and duplicate issues

  4. Step 4

    Re-run before import

How to interpret a passing result

A pass means this specific preflight did not find the issues listed above. It is not a guarantee that the target system will accept every row, field, custom mapping or account-specific rule.

Platform presets catch common import rules, but account-specific mappings, custom fields and plan-specific limits can still reject rows.