Envelope Address Line-Break Tool

Auto-wrap a CSV address column to your envelope width for Microsoft Word mail merge — the number of columns never changes, and your file never leaves your browser.

1. Choose your CSV

Drag & drop a CSV here, or click to browse

2. Envelope & font

3. Comma handling

Preview

In Word: connect to the downloaded CSV, put the «Address» field on its own line. The embedded breaks render automatically. Always run one test merge first.

What you can do with it

A stack of envelopes with neatly wrapped address lines

Bulk envelopes & labels

Print a whole address list on DL/C5 envelopes from Word mail merge — every line wraps to fit the envelope width instead of running off the edge.

A spreadsheet column converting into an envelope address

One column in, merge-ready CSV out

Point it at your address column. It adds the line breaks inside that one column and keeps every other column exactly as it was — your merge template still works.

A CSV file locked inside the browser, never uploaded to the cloud

100% private, in your browser

Your CSV is parsed and wrapped locally with JavaScript. Nothing is ever uploaded to a server — ideal for customer and member address lists.