Batch convert files to SUB online.
Large files from any format are supported.

You can convert to SUB Learn more about SUB from

Document/Office
txt Select TXT as "from" format
Subtitles
sami Select SAMI as "from" format smi Select SMI as "from" format srt Select SRT as "from" format


What is a SUB file?

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.

Common questions about converting to SUB

Can I convert to SUB in bulk?

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

Can I convert a file to SUB, if its size is 2 GB?

Yes, with MConverter Pro you can convert big files, up to 2 gigabytes each.
The free version lets you convert files up to 100 MB. If you need to convert files over 100 megabytes to SUB, try MConverter Pro. If your files aren’t over 1 GB, then you can use MConverter Plus instead, as it’s cheaper.

Is converting to SUB safe with MConverter?

Yes, we encrypt your connection using industry standards. Plus, your files are only accessible by you. 4 hours after the conversion completes, they are automatically deleted from MConverter’s servers. You can also delete your files immediately after finishing the conversion by clicking the bin icon.
Join thousands who have trusted us to convert over 14,958,095 files so far.

How long does it take to convert a file 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).

Converter to SUB Rating

4.5
1336 votes

Convert other Subtitles files:
SRT SMI SUB

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Apr 18, 2025
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Apr 28, 2022
I grab the webm I want to move to my phone and drag it over to the app, I click the type of file I want the webm converted to (mp4), it does it in 10 seconds. easiest 5/5 of my life.

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