Barcode Generator

Generate Code 128, Code 39, EAN-13, EAN-8, and UPC-A barcodes. Download as PNG or SVG.

Single Barcode

Barcode Format

Data / Value

Bar Width (px)

Height (px)

Bar Color

Background

Show text below barcode

Bulk Generation

Enter one value per line. Uses the format selected above.

Check Digit Calculator

Format

Digits (without check digit)

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`); w.document.close(); } function bulkGenerate(){ const lines=document.getElementById('bulkData').value.split('\n').map(l=>l.trim()).filter(Boolean); if(!lines.length) return; const format=document.getElementById('barcodeFormat').value; const barW=parseInt(document.getElementById('barWidth').value)||2; const barH=parseInt(document.getElementById('barHeight').value)||80; const barColor=document.getElementById('barColor').value; const bgColor=document.getElementById('bgColor').value; const showText=document.getElementById('showText').checked; const container=document.getElementById('bulkResults'); container.innerHTML=''; lines.forEach(val=>{ let bits=null,displayText=val; if(format==='code128') bits=C128.encode(val); else if(format==='code39'){bits=C39.encode(val);displayText='*'+val.toUpperCase()+'*';} else if(format==='ean13'){let d=val.replace(/\D/g,'');if(d.length===12)d+=EAN.checkDigit(d);if(d.length===13)bits=EAN.encodeEAN13(d);displayText=d;} else if(format==='ean8'){let d=val.replace(/\D/g,'');if(d.length===7)d+=EAN.checkDigitUPC(d);if(d.length===8)bits=EAN.encodeEAN8(d);displayText=d;} else if(format==='upca'){let d=val.replace(/\D/g,'');if(d.length===11)d+=EAN.checkDigitUPC(d);if(d.length===12)bits=EAN.encodeUPCA(d);displayText=d;} const item=document.createElement('div');item.className='bulk-item'; const canvas=document.createElement('canvas'); if(bits){renderBarcode(canvas,bits,displayText,barW,barH,barColor,bgColor,showText);} else{canvas.width=200;canvas.height=50;const ctx=canvas.getContext('2d');ctx.fillStyle='#f87171';ctx.font='12px sans-serif';ctx.fillText('Invalid: '+val,10,30);} item.appendChild(canvas); const p=document.createElement('p');p.textContent=val;item.appendChild(p); container.appendChild(item); }); } function calcCheckDigit(){ const format=document.getElementById('checkFormat').value; const input=document.getElementById('checkInput').value.replace(/\D/g,''); const result=document.getElementById('checkResult'); let expected,full; if(format==='ean13'){ if(input.length!==12){result.textContent='EAN-13 needs exactly 12 digits.';return;} const cd=EAN.checkDigit(input);full=input+cd; result.innerHTML=`Check digit: ${cd} — Full code: ${full}`; }else if(format==='ean8'){ if(input.length!==7){result.textContent='EAN-8 needs exactly 7 digits.';return;} const cd=EAN.checkDigitUPC(input);full=input+cd; result.innerHTML=`Check digit: ${cd} — Full code: ${full}`; }else{ if(input.length!==11){result.textContent='UPC-A needs exactly 11 digits.';return;} const cd=EAN.checkDigitUPC(input);full=input+cd; result.innerHTML=`Check digit: ${cd} — Full code: ${full}`; } } renderEmpty();