Batch convert from SMI to other formats.
Large SMI files are supported.

Max size: 200 MB per file

You can convert SMI Learn more about SMI files to


What is SMI?

Extension smi
Alternative extension sami
Category Subtitles file formats
Developed by Microsoft
Mime type -


SAMI is short for Synchronized Accessible Media Interchange. Developed in the late 90s by Microsoft, SMI or SAMI files were an accessibility initiative by the company. Such files contain subtitles with formatting, extended from HTML. In other words, subtitle text in the SAMI format can be bolded, italicized, underlined, colored, and more. SAMI files are used along with video files as closed captions.

Common questions about SMI conversions

How to open an SMI file?

If you don't know how to view an SMI file, you can convert it to another format you already recognize. You can use MConverter for the conversion.

Can I convert SMI files in bulk?

Yes, MConverter supports batch converting of multiple SMI files at once. You can even drag and drop folders containing SMIs.
Pasting SMI files and folders copied in the clipboard also works: use Ctrl+V.

Can I convert an SMI file, if its size is 1 GB?

Yes, with MConverter Premium you can convert big SMIs, up to 1 gigabyte each.
The free version lets you convert files up to 200 MB. If you need to convert SMI files over 200 megabytes, try MConverter Premium.

Is converting SMIs safe with MConverter?

Yes, we encrypt your connection using industry standards. Plus, your SMI files are only accessible by you. 24 hours after the conversion completes, they are automatically deleted from MConverter’s servers. You can also delete your SMIs and other converted files immediately after finishing the conversion by clicking the bin icon.
Join others who have trusted us to convert over 2,645,597 files so far.

How long does it take to convert SMI?

For most files with subtitles, the wait is just one or two seconds. However, MConverter also supports converting larger files with subtitles, meaning that it could take a while (up to over an hour, for example).
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