https://blog.aspose.com/ja/tag/free-xls-to-csv/
Free XLS to CSV
C# .NET Core, Java, Python, C++, Android, PHP, Node.js APIs to create, process and convert PDF, Word, Excel, PowerPoint, email, image, ZIP, and several other...
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https://www.docspal.com/conversion-api/xls-to-csv
XLS to CSV Conversion API
Convert Microsoft Excel Spreadsheet to Comma Separated Values quickly and accurately with our API, supporting advanced features for seamless, automated...
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https://rubygems.org/gems/xls_to_csv-paperclip-processor
xls_to_csv-paperclip-processor | RubyGems.org | your community gem host
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https://converthub.com/api/xls-to-csv
Convert XLS to CSV API | ConvertHub API
Convert XLS files to CSV format using our powerful REST API. Simple integration with cURL, PHP, JavaScript. S3/R2 bucket support. Start free.
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https://get.nero.com/publishers/VovSoft/XLStoCSVConverter/XLStoCSVConverter.html
Vovsoft XLS to CSV Converter by VOVSOFT - Free Download | get.nero.com
Vovsoft XLS to CSV Converter is a minimalist and user-friendly software that can help you convert multiple Excel spreadsheets to CSV files with only a few...
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