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Subscriber CSV Validator & Formatter Online

Paste or upload a recipient CSV list, catch duplicates and invalid formatting, and preview batch export filenames.

Validate recipient_id, name, custom_data, and email columns.
Preview per-subscriber output filenames before batch processing.
Download sample and corrected CSV templates.

Distribution mistakes usually trace back to messy subscriber lists: duplicate recipient IDs, unsafe filename characters, or columns that do not map to your delivery template.

This CSV validator catches those issues before you generate hundreds of unique copies. Paste or upload a list, preview output filenames, and download corrected templates without sending subscriber data to a server.

Validated lists feed directly into Foddo Distribution mode, where each row becomes a uniquely watermarked file with an invisible recipient ID ready for Inspect if a leak appears later.

Distribution prep

Subscriber CSV Validator

Validate recipient lists for Foddo distribution mode before generating per-subscriber copies with invisible tracking IDs.

Format: recipient_id,recipient_name,custom_data,email
Tokens: {recipient_id}, {recipient_name}, {custom_data}
Validation runs fully in your browser. Your subscriber list never leaves this page.
Workflow Upgrade

Move from one-off checks to repeatable protected delivery

Clean CSV data prevents delivery mistakes. Foddo turns a validated list into unique watermarked copies with invisible recipient IDs for every subscriber.

See how Foddo fits after this toolRead related guideExplore full workflow map
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