Google Ads Offline Conversion CSV Mapper

Nothing uploadedTested up to 200 MB

Map CRM conversion fields to a Google Ads offline-conversion CSV locally in your browser, with separate guidance for enhanced leads and legacy GCLID imports.

Processed locally in your browser

Map offline conversion fields

Prepare one CSV up to 200 MiB locally. Nablyx maps columns only; Google Ads still validates timestamps, identifiers, consent, hashing requirements, and conversion-action names at import.

Choose the Google Ads workflow

Google recommends enhanced conversions for leads for new setups. The GCLID-only file workflow is retained for existing legacy imports.

Enhanced conversions for leadsRecommended for new lead measurement. Map email or phone plus conversion details; keep GCLID when you have it.Legacy GCLID importFor an existing offline conversion action that still imports click conversions from a GCLID file.

Choose the source CSV

Use an export from your CRM, sales system, spreadsheet, or data warehouse.

Source CSV

Prepare offline conversion data before importing it into Google Ads

1
Choose a CRM or sales CSV.
2
Choose enhanced leads or the legacy GCLID workflow.
3
Map conversion name, time, match identifiers, value, currency, and order ID.
4
Review the required-field status.
5
Download the mapped CSV and import it through the matching Google Ads workflow.

Built for the real task

Google Ads field presets
Enhanced-lead and legacy GCLID modes
Automatic header suggestions
Browser-local CSV processing

See the transformation

Awkward source headers become import-ready columns.

Rename the columns you need while keeping every value under the correct header.

cust_idcustomer_id

given_namefirst_name

mailemail

✓ Values stay with the right column

Browser limits

Files are limited to 200 MB to protect browser stability, especially on phones. Processing stays on this device.

Google Ads field presets

Map CRM conversion fields to a Google Ads offline-conversion CSV locally in your browser, with separate guidance for enhanced leads and legacy GCLID imports.

Private by design

The selected file is not uploaded to Nablyx.

Processed locally in your browser

No. This tool reads and transforms the file locally in your browser.

Common uses

Google Ads field presets
Enhanced-lead and legacy GCLID modes
Automatic header suggestions
Browser-local CSV processing

Which import mode should I use?

Google recommends Enhanced Conversions for Leads for new offline lead measurement. Use the legacy GCLID mode only when your existing Google Ads conversion action still uses that file-import workflow.

Google Ads Offline Conversion CSV Format in 2026

How to Prepare a GCLID Offline Conversion Upload for Google Ads

Common Google Ads Offline Conversion Import Errors