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

Max size: 200 MB per file

You can convert SMI Learn more about SMI files to

Document/Office
Document/Office
Subtitles
Subtitles


How to convert SMI to SUB?

You can convert SMI to SUB 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 SUB is also supported: simply paste or drag and drop it.
  2. Click or tap on SUB from the list of target formats
    Alternatively, you can use the search field to quickly find the format you need, whether it's SUB or something else.
  3. Download your SUB files, after MConverter has finished processing them
    There's an option to automatically download the converted SUB files, so you don't have to press the download icon for each SUB.
    You may see a share icon as well. Use it to directly share the SUBs with other apps.

About the formats

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

Description

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 sub
Category Subtitles file formats
Developed by Tiamat Software
Mime type -

Description

MicroDVD Subtitle files (SUB) contain subtitle text, start and end time points. SUB files are meant to be used together with the corresponding video the subtitles are for. MicroDVD Subtitle do not support text formatting.
Note: SUB files do not contain a video stream inside.

Common questions about converting SMI to SUB

Can I convert SMI to SUB in bulk?

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

Can I convert an SMI file to SUB, 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 SUB 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 2,647,755 files so far.

How long does it take to convert SMI to SUB?

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).
Get it on Google Play Available on Samsung Galaxy Store Get it from Microsoft Store

Made with 💙 in 🇧🇬

My Account
Profile Picture
...
Free Edition
Action required
We need your attention to complete a payment.

Otherwise, your Premium benefits may stop working.

Downloads blocker detected
To stop seeing this message,
turn off Block automatic downloads
in Samsung Internet's Browsing pivacy dashboard settings.
To continue downloading your converted files, press the following button:
Download Files
Conversion History

To access files you have converted in the past during previous sessions,
you need to:

Legal Information
Options
Privacy Policy
Share with other apps

Fetching your file in order to share it with other apps...

Terms of Use
Upgrade

Upgrade to Premium

And get more features

Payments are processed by .
MConverter does not see your full credit card number.
Already purchased?

Verifying Your Premium

This may take a second...