Mail Merge

Mail merge is the workhorse that powers personalized outreach, batch contract drafting, and bulk customer communications: combine a list of records (typically a CSV from a CRM, spreadsheet, or signup form) with a template containing `{{placeholders}}`, and produce one filled-in document per record. Word and Google Docs have built-in mail merge but require uploading your CSV — a problem when it contains customer emails, deal sizes, or other data you'd rather not hand to a third party. The Mail Merge tool runs the full workflow client-side: paste or upload a CSV, write a Handlebars-style template (`{{first_name}}, your {{plan}} subscription renews on {{date}}`), see a per-record preview with a pager (first 10 buttons + total count), and copy or download all the rendered records as one concatenated text file with a configurable delimiter between records. The tool also tells you when your template references a column that doesn't exist (so you catch typos like `{{frist_name}}` immediately) and which CSV columns aren't being used (so you know what you're leaving on the table).