SUB to SMI Converter • Online & Free • MConverter

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

Drop Tap to Choose SUB Files Here

Or Browse

Paste files with Ctrl+V

To select multiple, hold and drag on the file icons

Please wait... Automatically download converted files Notifications when a conversion is done Remove "MConverter.eu" from file names

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How to convert SUB to SMI?

You can convert SUB to SMI with MConverter in three easy steps:

Choose SUB files from your device or cloud storage
At the top of this page, drag and drop your SUBs.

Alternatively, click on the Browse box to select files with your device's file picker, or copy and paste a SUB file by pressing Ctrl+V (or ⌘+V on Mac).

MConverter can easily import SUBs from Google Drive, OneDrive, and Dropbox.

Converting a folder with SUB files to SMI is also supported: simply paste, drag and drop it, or use the ADD FOLDER button.
Click or tap on SMI from the list of target formats
You could also use the search box at the top right to quickly find the format you need, whether it's SMI or something else.
Get your SMI files after MConverter has finished processing them
Click on DOWNLOAD ALL to save your SMIs to your default downloads folder, or select SAVE TO to choose another location.

You can also configure automatic file downloads during the conversion process or in the settings menu. When enabled, each SMI file is downloaded as soon as its conversion is complete, without waiting for the others to finish.

If supported by your device, you'll see a Share icon, allowing you to directly send converted files to other apps.

About the formats

File extension	.sub
Category	Subtitles file formats
Developed by	Tiamat Software
Mime type	text/x-microdvd

Format 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.

File extension	.smi
Alternative filename extension	.sami
Category	Subtitles file formats
Developed by	Microsoft
Mime type	application/x-sami

Format 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.