XLSM to HTML Converter
Convert XLSM to HTML online for free. Fast, secure, and high-quality conversion with no sign-up or software required.
Maximum file size is 1GB
How it works
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 XLSM file?
The XLSM format is a macro-enabled spreadsheet file created by Microsoft Excel 2007 and later versions, utilizing the Office Open XML (OOXML) standard (ISO/IEC 29500). Unlike the standard XLSX format, XLSM files store embedded macros written in Visual Basic for Applications (VBA), allowing for automation and complex scripting within the workbook. The file structure relies on ZIP compression to contain XML documents for data, styles, and macro binary parts (vbaProject.bin), presenting a security risk that often requires user authorization to execute active content.
How to open an XLSM file
XLSM files open natively in Microsoft Excel (2007+) on Windows and macOS, which provides full VBA execution support. For non-Microsoft environments, LibreOffice Calc, OpenOffice Calc, and WPS Office can open these files and view data, though VBA macro execution compatibility varies significantly. Google Sheets can import XLSM data but strips the VBA macros, converting the file to its native format without automation features.
XLSM Technical Info
- Full Name
- Excel Macro-Enabled Workbook
- Developed By
- Microsoft
- Initial Release
- 2007
- MIME Type
- application/vnd.ms-excel.sheet.macroEnabled.12
What is an HTML file?
HTML (HyperText Markup Language) is the standard markup language for documents designed to be displayed in a web browser, defined by the World Wide Web Consortium (W3C) and the WHATWG Living Standard. An HTML file consists of plain text tags that structure content into a Document Object Model (DOM), enabling the embedding of scripts (JavaScript), cascading style sheets (CSS), and multimedia. The format has evolved from SGML-based roots to the current HTML5 specification, which includes semantic elements and APIs for complex web applications.
How to open an HTML file
Operating systems universally support HTML rendering via pre-installed web browsers like Microsoft Edge (Windows), Safari (macOS), or Firefox (Linux). For source code modification, developers utilize specialized editors such as Visual Studio Code, IntelliJ IDEA, or Notepad++. No proprietary software is required, as the format is an open, non-proprietary standard text file.
HTML Technical Info
- Full Name
- HyperText Markup Language
- Developed By
- W3C / WHATWG
- Initial Release
- 1993
- MIME Type
- text/html
More tools
Related conversions
Why RunConvert
The fastest way to convert any file
Purpose-built for speed, privacy, and breadth of format support.
Convert XLSM to HTML in seconds
Every XLSM to HTML conversion runs on our servers, so your device stays fast and the output quality stays intact.
Fast, cloud-powered
No queue, no waiting. Files are processed on high-performance servers and returned in seconds, even for large files.
Secure & private
Encrypted in transit and never shared with anyone. Uploads are erased the moment your job completes, and results shortly after.
Free - no account needed
Convert without creating an account - no credit card, no trial clock. Sign in only if you want history and higher daily limits.
Developer API
Convert XLSM to HTML via API
Automate XLSM to HTML 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": "xlsm-to-html",
"tasks": {
"upload-file": {
"operation": "import/upload"
},
"convert": {
"operation": "convert",
"input": "upload-file",
"output_format": "html"
},
"export-result": {
"operation": "export/url",
"input": "convert"
}
}
}'
# 2. Upload your file (use upload_url from the response)
curl -X PUT "$UPLOAD_URL" --upload-file input.xlsm
# 3. Poll for result
curl https://api.runconvert.com/v3/jobs/$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.