Barcode Generator は何をしますか？
Barcode Generator はブラウザ上で結果を生成するツールで、結果と制限を明確に示します。 検証済みの機能： Code 128 and Code 39, EAN-13 and UPC-A check digits, SVG preview and export, PNG download and optional readable text.
When should you use this tool?
Use this tool for one-dimensional labels and test fixtures. Use QR Code Generator for Unicode text and URLs. For production product labels, confirm identifier assignment, required symbol dimensions and scanning quality separately.
使い方
- Choose the barcode type and enter text, or select Sample for a suitable value.
- Select Run and check the encoded text and barcode preview; keep leading zeroes in product codes.
- Download SVG or PNG. Preserve the white quiet zones and test a printed sample with the intended scanner.
実際の入出力例
Complete an EAN-13 check digit
入力
Type: EAN-13
Digits: 590123412345出力
Encoded digits: 5901234123457
SVG and PNG barcodeThe final 7 is computed from the first 12 digits. Supplying a complete 13-digit code with a wrong check digit produces an error instead of silently changing it.
一般的なエラーと対処
| 症状 | 原因 | 対処 |
|---|---|---|
| The product code is rejected. | The digit count or supplied check digit does not match EAN-13 or UPC-A. | Use 12/13 digits for EAN-13 or 11/12 for UPC-A. Keep leading zeroes and remove separators. |
| Text is rejected or a printed barcode does not scan. | Each symbology has a limited character set, and scanning depends on size, contrast and margins. | Use uppercase for Code 39 and printable ASCII for Code 128. Keep the margins and avoid stretching or low-resolution printing. |
Supported behavior and limitations
このツール固有の制限： Maximum 128 characters. Code 128 accepts printable ASCII only; Code 39 accepts uppercase letters, digits, spaces and - . $ / + %. EAN/UPC are digits only. A correct check digit does not prove a product identifier has been assigned or registered. This tool does not certify GS1 compliance, scanner compatibility or print quality. SVG uses vector paths; PNG is a raster export at the generated size.
標準と実装の参考資料
- bwip-js official repository (opens in a new tab)Local encoders and SVG drawing; MIT library and bundled font/component notices are included in the site license file.
Barcode Generator — FAQ
Is my input uploaded?
No. Processing happens in a browser Worker. Engine files load from this website; tool input, output, and filenames are not sent to a processing API.
Do I need an account or API key?
No account, API key, or backend processing service is needed.
How do I save a result?
Review the result, then use the Copy or Download control available for that output. Modifying input clears stale results.
What are the limits?
Maximum 128 characters. Code 128 accepts printable ASCII only; Code 39 accepts uppercase letters, digits, spaces and - . $ / + %. EAN/UPC are digits only. A correct check digit does not prove a product identifier has been assigned or registered. This tool does not certify GS1 compliance, scanner compatibility or print quality. SVG uses vector paths; PNG is a raster export at the generated size.
更新内容
実質的な更新： Barcode Generator: Added local processing, explicit size limits, cancellation, worked examples, error explanations, and downloadable results.