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XLS to XLSX

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Home/
Converters/
Document Converters/
XLS to XLSX

Document Converters

Browse document converters

Convert XLS to XLSX online

Convert XLS files to XLSX online for office files, reports, forms, and shareable document workflows with secure cloud processing and quick downloads.

What this converter does

Upload a XLS file and get a ready-to-download XLSX file with private cloud processing and short-lived download links.

File size limit

512 MB

Runtime limit

240 seconds

Secure Cloud Converter

Convert files online with secure cloud upload, private storage, and fast background processing.

Secure Uploads

Reliable Processing

Clean Output

Converter route

Choose file

How it works

1. Upload your XLS file securely from your browser.
2. TooloraHUB processes the conversion in the background.
3. Download the XLSX result when processing completes.

Supported formats and limits

Source format: XLS

Target format: XLSX

Maximum input size for this route: 512 MB.

Maximum processing window: 240 seconds.

Related converters

XLS to CSV XLS to EPS XLS to HTML XLS to ODS XLS to PDF XLS to PS XLS to XPS

Frequently asked questions

Is XLS to XLSX conversion secure?

Uploads are sent directly to private S3 storage through presigned URLs. Processing runs in AWS workers and output links are short-lived.

What are the limits for this converter?

This converter accepts files up to 512 MB and uses a processing window of up to 240 seconds.

Can I automate this conversion?

Yes. XLS to XLSX can be run manually or included in repeatable workflows and API-driven automation.

When should I convert XLS to XLSX?

Use this route when you need XLSX output from XLS source files for office files, reports, forms, and shareable document workflows.