Windows
Compatible applications
Quick Facts
Basic information about this file format
Extension
.SMI
File Type
Synchronized Multimedia Integration Language
Category
Data
Best first step
Use compatible software
Quick Summary
A practical overview of the .smi file format
The SMI (Synchronized Multimedia Integration Language) file format, often seen with the extension .smi or .sami, is a text-based markup language used to add subtitles or captions to multimedia content, primarily video. It's a relatively simple format that allows for the synchronization of text with…
File extension
.SMI
File type
Synchronized Multimedia Integration Language
Category
Data
Recommended action
Open with a trusted compatible app
How to open a .smi file
Start with a trusted app that supports this format
- Check the file extension carefully and confirm that the file name really ends with .smi.
- Use software that supports this file type. If one app does not work, try another compatible program for the same platform.
- Update the application if the file was created by a newer version of the software.
- Scan files from unknown sources before opening them, especially documents, archives, scripts, installers, and executable files.
What is a .smi file?
File extension details and usage information
The SMI (Synchronized Multimedia Integration Language) file format, often seen with the extension .smi or .sami, is a text-based markup language used to add subtitles or captions to multimedia content, primarily video. It's a relatively simple format that allows for the synchronization of text with audio and video streams. SMI files contain the text of the subtitles along with timing information that specifies when each line of text should appear and disappear on the screen. The timing is usually expressed in milliseconds. SMI files are typically used in conjunction with video players to display subtitles in various languages, making video content accessible to a wider audience, including those who are deaf or hard of hearing, or those who prefer to watch videos in a different language. The format supports basic text formatting, such as font styles and colors, although the extent of formatting support can vary depending on the video player or software being used. SMI is a precursor to more advanced subtitle formats like SRT and WebVTT, but it remains a widely supported format due to its simplicity and ease of creation. It's often used for encoding subtitles for DVDs and online video streaming.
Software Compatibility
Programs that may open or work with .smi files
macOS
Compatible applications
Linux
Compatible applications
Mobile
Mobile applications
Can .smi files be converted?
Options for saving or exporting this file to another format
In many cases, a .smi file can be converted by opening it in compatible software and using an option such as Save As, Export, or Convert. The available output formats depend on the file type and the application used.
- Use the original software that created the file when possible.
- Check whether the application supports exporting to common formats.
- Be careful with online converters when working with private, business, or sensitive files.
- If conversion fails, the file may be corrupted, incomplete, encrypted, or not actually a .smi file.
Why can't I open a .smi file?
Common reasons this file type may not open correctly
Wrong software
The file may require a specific program that supports the .smi format.
Incorrect extension
The file extension may have been renamed manually, even though the actual file format is different.
Corrupted file
The file may be incomplete, damaged during download, or transferred incorrectly.
Outdated app
Your software may need to be updated before it can open newer versions of this file format.
Frequently Asked Questions
Common questions about .smi files
To open a .smi file, use software that supports this file format.
- VLC Media Player
- Media Player Classic
- BS.Player
- PotPlayer
- Windows Media Player (with codecs)
Open the file in compatible software and look for options such as Save As, Export, or Convert. If no export option is available, the file may require a specialized converter or the original application that created it.
- Verify that the file extension is correct.
- Install or update compatible software.
- Try another application that supports this format.
- Check whether the file is corrupted, incomplete, or encrypted.
A file extension alone does not guarantee whether a file is safe or unsafe. Only open files from trusted sources, scan unknown files before opening them, and be especially careful with executable, script, archive, and document files.
File safety tips
Use caution with unknown files
Only open files from trusted sources. Before opening a .smi file, scan it with antivirus software, verify that the file extension is expected, and avoid running unknown executable, installer, macro-enabled document, or script files.