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Private DOCX Mail-Merge Runner

Download a browser runner that joins a Word template with CSV rows and saves one private DOCX per row in a ZIP.

Instant results
Private in your browser
PDF report included

Mail-merge runner

Ready to download

A local DOCX and CSV mail-merge runner is ready for up to 250 rows and 4 expected placeholders.

Expected placeholders: 4
Row safety limit: 250
Libraries: docxtemplater + PizZip

Expected template fields
DOCX placeholder	CSV header
{firstName}	firstName
{lastName}	lastName
{program}	program
{startDate}	startDate

Ready to use

Review and make it yours

Edit the draft before publishing or sending it. Your changes stay on this device unless you copy or download them.

Copy-ready draft

<!doctype html><html lang="en"><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>North Star document merge</title><style>*{box-sizing:border-box}body{margin:0;background:#eef0ed;color:#17211d;font:17px/1.55 system-ui}.app{width:min(820px,calc(100% - 28px));margin:auto;padding:56px 0}h1{font-size:clamp(45px,8vw,76px);line-height:.95;margin:0 0 18px}.card{padding:26px;border-radius:18px;background:white;margin:14px 0}.card label{display:block;font-weight:800;margin-bottom:8px}.card input{width:100%;padding:13px;border:1px solid #b9c4be;border-radius:9px}button{padding:15px 20px;border:0;border-radius:10px;background:#315c4b;color:white;font-weight:850;font-size:17px}.status{padding:18px;border-left:5px solid #315c4b;background:white;margin-top:20px}.placeholders{font-family:ui-monospace,monospace}</style><main class="app"><h1>North Star document merge</h1><p>Select a DOCX containing placeholders such as {firstName} and {lastName}, then a CSV with matching headers. Files stay in this browser.</p><div class="card"><label for="template">1. Word template (.docx)</label><input id="template" type="file" accept=".docx,application/vnd.openxmlformats-officedocument.wordprocessingml.document"></div><div class="card"><label for="csv">2. Data rows (.csv)</label><input id="csv" type="file" accept=".csv,text/csv"><p class="placeholders">Expected headers: firstName, lastName, program, startDate</p></div><button id="merge">Create merged ZIP</button><p class="status" id="status" role="status">Ready for a template and CSV.</p></main><script src="https://cdn.jsdelivr.net/npm/papaparse@5.5.4/papaparse.min.js"></script><script src="https://cdn.jsdelivr.net/npm/pizzip@3.2.0/dist/pizzip.min.js"></script><script src="https://cdn.jsdelivr.net/npm/docxtemplater@3.69.3/build/docxtemplater.js"></script><script>const pattern="{lastName}-{firstName}-welcome.docx",limit=250,status=document.querySelector('#status');function read(file,mode){return new Promise((resolve,reject)=>{const reader=new FileReader();reader.onerror=reject;reader.onload=()=>resolve(reader.result);mode==='text'?reader.readAsText(file):reader.readAsArrayBuffer(file)})}function cleanName(name){return name.replace(/[\/:*?"<>|]/g,'-').replace(/s+/g,' ').trim().slice(0,160)||'merged.docx'}function filename(row,index){return cleanName(pattern.replace(/{([^}]+)}/g,(_,key)=>String(row[key]??(key==='row'?index+1:key))))}document.querySelector('#merge').onclick=async()=>{const template=document.querySelector('#template').files[0],csv=document.querySelector('#csv').files[0];if(!template||!csv){status.textContent='Choose both a DOCX template and CSV first.';return}try{status.textContent='Reading local files…';const [templateData,csvText]=await Promise.all([read(template,'array'),read(csv,'text')]),parsed=Papa.parse(csvText,{header:true,skipEmptyLines:true});if(parsed.errors.length)throw new Error(parsed.errors[0].message);const rows=parsed.data.slice(0,limit),archive=new PizZip();for(let index=0;index<rows.length;index++){const zip=new PizZip(templateData),doc=new window.docxtemplater(zip,{paragraphLoop:true,linebreaks:true,nullGetter:()=>''});doc.render(rows[index]);const output=doc.getZip().generate({type:'uint8array'});archive.file(filename(rows[index],index),output)}const blob=archive.generate({type:'blob'}),url=URL.createObjectURL(blob),link=document.createElement('a');link.href=url;link.download='merged-documents.zip';link.click();setTimeout(()=>URL.revokeObjectURL(url),1000);status.textContent='Created '+rows.length+' DOCX files in one ZIP. Review every document.'}catch(error){status.textContent='Merge stopped: '+(error.properties?.errors?.map(item=>item.properties?.explanation).filter(Boolean).join('; ')||error.message)}};</script></html>

128 words · 3786 characters

Use the result well

A clear answer, with the assumptions visible

These recommendations turn the result into an operational next step without hiding the inputs behind a score.

1
Use a sample CSV before merging private records.
2
Make every DOCX placeholder match one CSV header exactly.
3
Review names, dates, blank values, and every generated document.

How this tool works

Read the selected DOCX and CSV locally in the downloaded browser runner.
Use Papa Parse, PizZip, and docxtemplater to fill one document per row.
Bundle the filled DOCX files into one ZIP without uploading source files.

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A clear answer, with the assumptions visible

How this tool works

Use this with every client

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