Free Online OST to XLTM Converter

Convert OST to XLTM documents online from any device, with a modern browser like Chrome, Opera and Firefox.

Discover GroupDocs.Conversion free online app!

Free Document Conversion, Viewer, Merger app for Windows

  • Easily convert, view or merge unlimited files on your own Windows PC.
  • Process Word, Excel, PowerPoint, PDF and more than 100 file formats.
  • No limit of file size.
  • Batch conversion of multiple files.
  • One app with rich features like Conversion, Viewer, Merger, Parser, Comparison, Signature
  • Regular FREE updates with new features coming every month
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OSTOutlook Offline Storage File

OST or Offline Storage Files represent the user's mailbox data in offline mode on the local machine upon registration with Exchange Server using Microsoft Outlook. It is automatically created on the first use of Microsoft Outlook upon connectivity with the server. Once the file is created, the data is synchronized with the email server so that it is available offline as well in case of disconnectivity from the email server.

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XLTMMicrosoft Excel Macro-Enabled Template

The XLTM file extension represents files that are generated by Microsoft Excel as Macro-enabled template files. XLTM files are similar to XLTX in structure other than that the later doesn't support creating template files with macros. Such template files are used to generate and set the layout, formatting, and other settings along with the macros to facilitate creating similar XLSX files then.

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How to convert OST to XLTM

  • Open free GroupDocs App website and choose GroupDocs.Conversion application.
  • Click inside the file drop area to upload OST file or drag & drop OST file.
  • Click on Convert button. Your OST files will be uploaded and converted to XLTM result format.
  • Download link of result files will be available instantly after conversion.
  • You can also send a link to the XLTM file to your email address.
  • Note that file will be deleted from our servers after 24 hours and download links will stop working after this time period.


  • ❓ How can I convert OST?
    First, you need to add a file for conversion: drag & drop your OST file or click inside the white area to choose a file. Then click the "Convert" button. When OST to XLTM conversion is completed, you can download your XLTM file.
  • ⏱️ How long does it take to convert OST?
    This converter works fast. You can change OST to XLTM in a few seconds.
  • 🛡️ Is it safe to convert OST to XLTM using free GroupDocs converter?)
    Of course! The download link of XLTM files will be available instantly after conversion. We delete uploaded files after 24 hours and the download links will stop working after this time period. No one has access to your files. File conversion (including OST is absolutely safe.
  • 💻 Can I convert OST to XLTM on Linux, Mac OS or Android?
    Yes, you can use free GroupDocs converter on any operating system that has a web browser. Our OST to XLTM converter works online and does not require any software installation.
  • 🌐 What browser should I use to convert OST?
    You can use any modern browser to convert OST, for example, Google Chrome, Firefox, Opera, Safari.
  • </> How can I get the source code for OST to XLTM conversion?
    Detailed examples are available at GitHub in the form of executable projects. If you are only interested in OST to XLTM conversion then check .NET & Java examples.

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Java version of GroupDocs.Conversion library & API.
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Integrate document conversion in your apps using our out-of-the-box open-source front-end solutions based on Angular and GroupDocs.Conversion for .NET/Java.
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 GroupDocs.Total for .NET and Java

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GroupDocs.Total provides multiple high quality features against over 120 document formats, such as conversion, signature, parser and much more!

Other Supported Conversions

You can also convert OST into many other file formats. Please see the complete list below.

OST TO EML Converter (E-Mail Message File)
OST TO EMLX Converter (Apple Mail Message)
OST TO MSG Converter (Microsoft Outlook Email Format)
OST TO PDF Converter (Portable Document)
OST TO EPUB Converter (Digital E-Book File Format)
OST TO XPS Converter (Open XML Paper Specification)
OST TO TEX Converter (LaTeX Source Document)
OST TO PPT Converter (PowerPoint Presentation)
OST TO PPS Converter (Microsoft PowerPoint Slide Show)
OST TO PPTX Converter (PowerPoint Open XML Presentation)
OST TO PPSX Converter (PowerPoint Open XML Slide Show)
OST TO ODP Converter (OpenDocument Presentation File Format)
OST TO OTP Converter (Origin Graph Template)
OST TO POTX Converter (Microsoft PowerPoint Open XML Template)
OST TO POT Converter (PowerPoint Template)
OST TO POTM Converter (Microsoft PowerPoint Template)
OST TO PPTM Converter (Microsoft PowerPoint Presentation)
OST TO PPSM Converter (Microsoft PowerPoint Slide Show)
OST TO FODP Converter (OpenDocument Flat XML Presentation)
OST TO XLS Converter (Microsoft Excel Binary File Format)
OST TO XLSX Converter (Microsoft Excel Open XML Spreadsheet)
OST TO XLSM Converter (Microsoft Excel Macro-Enabled Spreadsheet)
OST TO XLSB Converter (Microsoft Excel Binary Spreadsheet File)
OST TO ODS Converter (Open Document Spreadsheet)
OST TO XLTX Converter (Microsoft Excel Open XML Template)
OST TO XLT Converter (Microsoft Excel Template)
OST TO TSV Converter (Tab Separated Values File)
OST TO XLAM Converter (Microsoft Excel Macro-Enabled Add-In)
OST TO CSV Converter (Comma Separated Values File)
OST TO FODS Converter (OpenDocument Flat XML Spreadsheet)
OST TO SXC Converter (StarOffice Calc Spreadsheet)
OST TO DOC Converter (Microsoft Word Document)
OST TO DOCM Converter (Microsoft Word Macro-Enabled Document)
OST TO DOCX Converter (Microsoft Word Open XML Document)
OST TO DOT Converter (Microsoft Word Document Template)
OST TO DOTM Converter (Microsoft Word Macro-Enabled Template)
OST TO DOTX Converter (Word Open XML Document Template)
OST TO RTF Converter (Rich Text File Format)
OST TO ODT Converter (Open Document Text)
OST TO OTT Converter (Open Document Template)
OST TO TXT Converter (Plain Text File Format)
OST TO MD Converter (Markdown)
OST TO TIFF Converter (Tagged Image File Format)
OST TO TIF Converter (Tagged Image File Format)
OST TO JPG Converter (Joint Photographic Expert Group Image File)
OST TO JPEG Converter (JPEG Image)
OST TO PNG Converter (Portable Network Graphic)
OST TO GIF Converter (Graphical Interchange Format File)
OST TO BMP Converter (Bitmap File Format)
OST TO ICO Converter (Microsoft Icon File)
OST TO PSD Converter (Adobe Photoshop Document)
OST TO WMF Converter (Windows Metafile)
OST TO EMF Converter (Enhanced Metafile Format)
OST TO DCM Converter (DICOM Image)
OST TO WEBP Converter (Raster Web Image File Format)
OST TO SVG Converter (Scalable Vector Graphics File)
OST TO JP2 Converter (JPEG 2000 Core Image File)
OST TO EMZ Converter (Enhanced Windows Metafile Compressed)
OST TO WMZ Converter (Windows Metafile Compressed)
OST TO SVGZ Converter (Compressed Scalable Vector Graphics File)
OST TO HTML Converter (Hyper Text Markup Language)
OST TO HTM Converter (Hypertext Markup Language File)
OST TO MHT Converter (MIME Encapsulation of Aggregate HTML)
OST TO MHTML Converter (MIME Encapsulation of Aggregate HTML)