Upload a CSV containing participant fields (first_name, last_name, dob).
To include a date suffix, add column include_date with text "Y", and the required date in the column date.
Enter the secret passphrase / seed below — it is never stored or exported.
Output will add: sanitised_first_name, sanitised_last_name, pid, and pid_with_date (when a row explicitly requests and supplies a date).
first_name, last_name, dob (YYYY‑MM‑DD preferred)include_date (Y/N) and date (YYYY‑MM‑DD or YYYYMMDD)
Output appends: sanitised_first_name, sanitised_last_name, pid, and pid_with_date
(the last one is populated only where a row has include_date = Y and provides a valid date).