XLT to XLS Converter
Convert XLT to XLS online for free. Fast, secure, and high-quality conversion with no sign-up or software required.
Maximum file size is 1GB
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Three steps to your converted file
Everything happens in your browser tab - upload, pick a format, download. The heavy lifting runs on our servers.
Upload your file
Drag and drop, click to browse, or paste a URL. Batches take up to 20 files at once - 230+ input formats across video, audio, image, document, and archive types.
Choose an output format
Pick from over a hundred output formats. Filter by category or search by name - every option is open to everyone, no account needed.
Convert & download
Hit Convert and grab your download link moments later. Originals are erased when the job completes; results are cleared within about an hour.
What is an XLT file?
The XLT format is a legacy spreadsheet template file used by Microsoft Excel versions 97 through 2003. It utilizes the proprietary Binary Interchange File Format (BIFF8), storing formatting, formulas, and baseline data in a binary stream rather than the XML structure of modern formats. These templates serve as blueprints for generating new .XLS workbooks with consistent layouts, preventing the overwriting of the original template file upon saving.
How to open an XLT file
Modern versions of Microsoft Excel retain backward compatibility for XLT files, automatically converting them to the newer XLTX or XLTM format upon saving. Third-party applications such as LibreOffice Calc and Kingsoft Spreadsheets can render XLT templates, though complex formatting or legacy macros may require adjustment. Google Sheets supports importing XLT files, converting them to the native Google Sheets format.
XLT Technical Info
- Full Name
- Excel Binary Template
- Developed By
- Microsoft
- Initial Release
- 1997
- MIME Type
- application/vnd.ms-excel
What is an XLS file?
The XLS format utilizes the Binary Interchange File Format (BIFF) scheme, serving as the default spreadsheet standard for Microsoft Excel from versions 2.0 through 2003. Encapsulated within the Object Linking and Embedding (OLE) Compound File Binary Format (CFBF), XLS files store data in binary streams rather than XML. This proprietary structure supports formulas, Visual Basic for Applications (VBA) macros, and charts but lacks the compression efficiency and corruption resilience of the newer XML-based standards.
How to open an XLS file
Microsoft Excel remains the primary software for full fidelity access to XLS files. On Windows and macOS, the operating system associates these files with the Office suite if installed. Alternatively, open-source solutions like LibreOffice Calc and Gnumeric provide robust reverse-engineered support for reading and editing XLS binaries on Linux and other platforms without requiring Microsoft licenses.
XLS Technical Info
- Full Name
- Excel Binary File Format
- Developed By
- Microsoft
- Initial Release
- 1987
- MIME Type
- application/vnd.ms-excel
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Purpose-built for speed, privacy, and breadth of format support.
Convert XLT to XLS in seconds
Every XLT to XLS conversion runs on our servers, so your device stays fast and the output quality stays intact.
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No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.
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Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.
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Developer API
Convert XLT to XLS via API
Automate XLT to XLS conversions in three steps: create a job, upload your file, then poll for the result.
# 1. Create job
curl -X POST https://api.runconvert.com/v3/jobs \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"tag": "xlt-to-xls",
"tasks": {
"upload-file": {
"operation": "import/upload"
},
"convert": {
"operation": "convert",
"input": "upload-file",
"output_format": "xls"
},
"export-result": {
"operation": "export/url",
"input": "convert"
}
}
}'
# 2. Upload your file (use upload_url from the response)
curl -X PUT "$UPLOAD_URL" --upload-file input.xlt
# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$JOB_ID?include=tasks \
-H "Authorization: Bearer YOUR_API_KEY"Replace YOUR_API_KEY with your RunConvert API key. Get your free API key at runconvert.com/api.