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SUB SMI
File conversion

Convert SUB to SMI

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Is it possible to convert SUB to SMI?
Yes - SUB converts to SMI.

Convert to SAMI (.smi/.smil), Microsoft's older HTML-like caption format. Subtitle Edit supports SAMI as a target; db lists 1 program for this pair.

1 programs
Also to SMI: TDT

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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How to convert SUB to SMI

Converting a .SUB file to .SMI lets you open the content in software that prefers the .SMI format, though some details may change compared with the original. The programs listed below open .SUB files and can save or export them to .SMI (or a closely related format). One of them is URUworks Subtitle Workshop: Subtitle Workshop is a subtitle file editing and creation application developed by URUWorks. It supports a wide range of subtitle formats including SRT, ASS,….

A full step-by-step guide for this conversion is on the way; the information above is drawn straight from our database.

Programs that convert SUB

URUworks Subtitle Workshop

About these formats

.SUB MicroDVD / SubViewer Subtitle File (text-based movie subtitles)

A SUB file stores movie subtitles as plain text, either in MicroDVD format (frame numbers in braces) or SubViewer format (timecodes). To use it, give it the same name as the video and put…

Open .SUB details →
.SMI SAMI Captioning File

A SMI file is usually a SAMI caption file - Microsoft's HTML-like subtitle format for video, introduced in 1998. To watch it with a video, give the .smi the same base name as the video and…

Open .SMI details →