SMI Subtitle Translator with Perfect Sync
SubTran is a free AI-powered SMI and SAMI subtitle translator. Instantly translate captions into 100+ languages with perfect timing and format preserved.
Your subtitles are processed in memory and never stored on our servers.
Translate other subtitle formats
How to Translate SMI Subtitle Files Online with AI
Translating SMI or SAMI subtitle files with SubTran takes just a few steps. No account, no install, and your file stays private.
Upload your .smi or SAMI file
Drag and drop your caption file into SubTran’s secure online tool. All processing is done in your browser.
Select a language and translation mode
Pick from over 100 supported languages for your SMI subtitle translation. Choose single or bilingual export as needed.
Download your translated file
Get a fully timed, ready-to-use .smi file with perfectly preserved sync and formatting. No registration required.
AI Subtitle Translator Features for SAMI and SMI Files
Timing preserved for legacy subtitle converter users
Only dialogue is translated. Every timestamp and cue in your SAMI or SMI file remains byte-identical, ensuring flawless sync.
Context-aware AI for better subtitle translation
A large language model understands idioms, slang, and tone, producing natural translations for SMI captions, not just literal word swaps.
Translate SMI subtitles into 100+ languages
Enjoy full support for over 100 languages, including low-resource ones. Translate SMI files for international audiences.
Same subtitle format in and out
Upload a SAMI or SMI file and receive the same format back, ready for Windows Media Player or legacy systems.
Bilingual export for learning and review
Keep both original and translated subtitles together in one file, making it easier to compare versions or study languages.
Drag-and-drop online SMI translator
Start translating instantly in your browser. No software install, no signup, just upload, pick, and download.
Subtitle Timing Preservation and Other Key Benefits
Never lose sync with subtitle timing synchronization
Translated captions stay perfectly aligned with your video, thanks to precise handling of SMI and SAMI file timings.
Reach global audiences with multilingual subtitles
Easily localize your caption files for viewers worldwide, supporting accessibility and global distribution.
Private and free to start
SubTran runs in your browser and processes files in memory. Your first translation requires no account and nothing is stored.
Save hours over manual SAMI file translation
Skip tedious line-by-line edits. SubTran translates a full SMI file in about a minute, ready to use.
Natural, readable subtitle quality
AI-powered translation delivers captions that sound fluent and human, not robotic or stilted.
Works on any device with a web browser
SubTran is fully online. Access it on Windows, macOS, Linux, or even mobile, no downloads required.
Use Cases for Legacy Subtitle Converter and More
Translate SMI captions for international viewers
Convert .smi (SAMI) subtitle files into dozens of languages for broader accessibility and reach.
Modernize legacy media libraries
Update older SAMI collections with fresh translations for new audiences or streaming platforms.
Translate captions for Windows Media content
Handle SAMI subtitles originally made for classic Windows Media Player and make content accessible today.
Open up educational and archival SMI resources
Bring archived subtitle files to new learners and researchers across the globe.
Boost accessibility with AI subtitle translation
Provide accurate, multilingual captions for users with hearing needs or language preferences.
Language learning with bilingual SMI files
Export both original and translated captions together for side-by-side study or review.
SMI and SAMI Subtitle Translator FAQ
What is a SAMI / SMI file?
SAMI (Synchronized Accessible Media Interchange) is a Microsoft caption format with the .smi extension. SubTran translates the text while keeping all sync timings and formatting intact.
Does SubTran support multiple languages for SMI files?
Yes, SubTran supports over 100 languages for SMI and SAMI files. You can translate between any supported languages, including less common ones.
How to use SubTran for old media player subtitles?
Simply upload your legacy SMI or SAMI file. SubTran will translate the captions and preserve timing, making them ready for older media players or new platforms.
Can SubTran handle legacy subtitle libraries?
SubTran is ideal for legacy subtitle libraries. It preserves byte-level timing, ensuring translated SMI files remain compatible with archival or classic playback systems.
Is there a free tool for SAMI subtitle translation?
SubTran is a free online SAMI subtitle translator. You can translate your first SMI or SAMI file without any signup or payment.
How to upload .smi files for translation?
Drag and drop your .smi (SAMI) file into SubTran’s online tool. Select your language and download your translated file instantly.
Which subtitle formats does SubTran support?
SubTran currently supports SAMI (.smi) files. For other formats like SRT or VTT, check our dedicated SRT Translator and VTT Translator tools.
Can I convert SAMI to SRT with timing preservation?
SubTran focuses on SAMI/SMI translation while keeping timing. For SMI to SRT conversion, use our SRT Translator, which also preserves timing info.
Try SubTran: Free Online SMI Subtitle Translator
Translate SMI and SAMI subtitle files instantly, with perfect timing and AI-powered accuracy. No signup or install required.