Convert SMI to TXT in bulk.
Large SMI files are supported.

Max size: 200 MB per file

You can convert SMI Learn more about SMI files to


How to convert SMI to TXT?

You can convert SMI to TXT with MConverter in three easy steps:
  1. Choose SMI files from your device
    At the top of this page, drag and drop your SMIs.
    You can also click to select SMI files using your operating system's file picker.
    Another method is to press the keyboard shortcut Ctrl+V (⌘+V on Mac) to paste an SMI file you have copied to clipboard.
    Converting a folder with SMI files to TXT is also supported: simply paste or drag and drop it.
  2. Click or tap on TXT from the list of target formats
    Alternatively, you can use the search field to quickly find the format you need, whether it's TXT or something else.
  3. Download your TXT files, after MConverter has finished processing them
    There's an option to automatically download the converted TXT files, so you don't have to press the download icon for each TXT.
    You may see a share icon as well. Use it to directly share the TXTs with other apps.

About the formats

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.
Extension txt
Category Document/Office file formats
Developed by -
Mime type text/plain


TXT files are regular text files. They cannot contain formatting.

Common questions about converting SMI to TXT

Can I convert SMI to TXT in bulk?

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

Can I convert an SMI file to TXT, 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 to TXT 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 2,646,840 files so far.

How long does it take to convert SMI to TXT?

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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