Convert XLS to CSV: Free Online Converter
Convert Microsoft Excel Spreadsheet to Comma-Separated Values online for free. Fast, secure document conversion with no watermarks or registration.
XLSに対応
アップロードすることで、これらのファイルの権利を有していること、および利用規約に同意することを確認したものとみなされます。
安全な転送
HTTPS暗号化アップロード
プライバシー優先
ゲストのファイルは約2時間で自動削除
登録不要
すぐに変換を開始
どこでも動作
あらゆるブラウザ、あらゆるデバイス
XLS から CSV への設定
- エンジン
- ドキュメント
- 設定
- 設定は不要です。適切な初期値が使われます。
変換方法
アップロードエリアにドラッグするか、クリックして選択し、.xlsファイルをアップロードしてください。
必要に応じて出力設定を調整してください。デフォルト設定ではオリジナルの品質を維持します。
「変換」をクリックし、準備ができたら.csvファイルをダウンロードしてください。
XLSからCSVへの変換について
XLS is Microsoft's legacy binary spreadsheet format, used by Excel 97 through Excel 2003 and encoded in the Binary Interchange File Format (BIFF). CSV (Comma-Separated Values) is a plain-text tabular format where each row is a line and columns are separated by commas. Converting XLS to CSV extracts the cell data from the binary container and outputs it as a universally readable text file that any programming language, database import tool, or spreadsheet application can parse.
This conversion strips away all formatting, formulas, charts, macros, and multiple-sheet structure that the XLS file may contain. Only raw cell values from the active or first worksheet are exported, producing a lightweight text file that is ideal for data interchange, database imports, and automated processing pipelines.
XLSをCSVに変換する理由
CSV is the universal exchange format for tabular data. Every database system, scripting language, ETL pipeline, and analytics platform can ingest CSV natively. When you need to feed XLS spreadsheet data into Python pandas, R, SQL Server bulk import, or a cloud data warehouse like BigQuery or Snowflake, CSV is the expected input format.
Legacy XLS files locked in the BIFF binary format cannot be read by many modern data tools without specialized libraries. Converting to CSV removes the Microsoft-specific encoding and produces a standards-based text file that will remain readable for decades without any proprietary software dependency.
主な活用例
- Import legacy Excel 97-2003 spreadsheet data into SQL databases
- Feed XLS financial records into Python or R analytics scripts
- Prepare XLS inventory lists for bulk upload to e-commerce platforms
- Convert XLS contact lists for CRM system imports
- Extract XLS survey data for processing in statistical software
仕組み
The conversion engine uses a headless office-document engine to open the XLS binary file, interpret the BIFF record stream, and export the first worksheet as CSV with UTF-8 encoding and comma delimiters. Formulas are resolved to their computed values at the time of conversion. Dates are exported in ISO 8601 format. Numeric precision is preserved up to 15 significant digits, matching Excel's internal double-precision floating-point representation.
品質とパフォーマンス
Cell values are exported with full numeric precision. Formatting such as currency symbols, percentage signs, and thousands separators is stripped — only raw values remain. Merged cells are unmerged, with the value placed in the top-left cell and remaining cells left empty. Multi-sheet workbooks export only the first sheet; convert each sheet separately if all sheets are needed.
デバイス互換性
| Device | XLS | CSV |
|---|---|---|
| Windows PC | Partial | Partial |
| macOS | Partial | Partial |
| iPhone/iPad | Partial | Partial |
| Android | Partial | Partial |
| Linux | Partial | Partial |
| Web Browser | No | No |
最良の結果を得るためのヒント
- 1Check that formulas have been recalculated in Excel before converting — stale formula results carry over
- 2Convert multi-sheet workbooks one sheet at a time for complete data extraction
- 3Verify date formats in the output match your target system's expectations
- 4Use a text editor to inspect the first few lines of the CSV before bulk importing into a database
- 5Remove header rows or adjust column names in the CSV if the target system expects specific field names
関連する変換
XLS to CSV conversion liberates spreadsheet data from Microsoft's proprietary binary format into a universal plain-text representation suitable for any data processing workflow.
XLSとCSVの比較
| 特徴 | XLS | CSV |
|---|---|---|
| 正式名称 | Microsoft Excel 97-2003 | Comma-Separated Values |
| 拡張子 | .xls | .csv |