Documents

XLTX → XLSX

Learn about the formats: What is XLSX?

At a glance

ConvertX.am converts XLTX files to XLSX online, for free and without signing up. Upload a file of up to 500 MB and download the XLSX result; uploaded and converted files are deleted automatically within about an hour.

Input:: XLTX
Output:: XLSX
Price:: Free, no sign-up
File size:: Up to 500 MB
Your files:: Deleted automatically within about an hour

Convert XLTX Excel template files to standard XLSX spreadsheets instantly. This tool is essential when you need to fill a template with data and save it as a regular workbook.

XLTX is an OpenXML Microsoft Excel template format designed for creating multiple documents with pre-defined formatting and formulas, whereas XLSX is the standard workbook format used for storing active data. When converting XLTX to XLSX, the underlying structure, cell styles, macros, and formulas are preserved, but the file's primary role shifts from a master template to a standalone data document ready for editing, sharing, and reporting.

The conversion from XLTX to XLSX occurs entirely without data loss, meaning your formatting, formulas, and visual layouts retain 100% of their original fidelity while the file size changes insignificantly.

Tips

Check all embedded formulas after conversion to ensure cell references point correctly to the new workbook context.
Remove any placeholder text in your XLTX file before converting if you want a clean starting point for data entry.
Save a backup copy of your original XLTX template so you can generate more XLSX reports in the future.

Common use cases

Turning a monthly financial budgeting template (XLTX) into a finalized report (XLSX) for executive review.
Converting an invoice template into a specific client billing document without altering the master design.
Preparing employee timesheet templates for submission to the HR department.

Why ConvertX stays free — forever

We built this project so anyone can convert files without paywalls, accounts, or hidden limits. Here is what that promise means in practice.

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Free tools today — and always

Every converter on ConvertX is free to use: no trials, no premium tiers, and no credit packs. We will never put core conversion features behind a subscription. Whether you convert one photo or a hundred files a week, the price stays zero.

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Privacy-first processing

Many image, audio, and video conversions run entirely in your browser. Your files never leave your device for those jobs. When server processing is required for documents or specialized formats, uploads are handled securely and removed automatically — typically within one hour.