What if my SMI file won't convert?

Ensure the file isn't corrupted or DRM-protected. Try a different file to verify. If issues persist, the file may use an unsupported codec variant.

How many times can I convert SMI to TTML per day?

There's no daily limit for free users. Convert as many files as you need, as often as you need. PRO users get additional batch processing features.

Can I use this converter for commercial purposes?

Yes. There are no restrictions on how you use your converted files. Convert SMI to TTML for personal, educational, or commercial projects freely.

Can I convert TTML back to SMI?

Yes! Xonvert supports reverse conversion too. Visit the TTML to SMI converter page to convert back.

Can I convert SMI to TTML without losing transparency?

Transparency is a concept specific to image formats. For subtitle files, all content data is preserved during conversion.

Is TTML better than SMI?

Neither is universally "better" — they serve different purposes. SAMI Subtitle excels at HTML-like subtitle format with CSS styling support. TTML Subtitle is stronger in broadcast and streaming industry standard with rich features. Choose based on your needs.

How long does SMI to TTML conversion take?

Most files convert in under 5 seconds. Larger files may take 10-30 seconds depending on your device's processing speed.

Convert SMI to TTML

Fast, free, and secure SMI to TTML conversion. No registration required.

smi

ttml

Fast, free, and secure SMI to TTML conversion. No registration required.

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High Quality

Maintain maximum quality during conversion

Fast Processing

Convert files in seconds with our optimized engine

Secure & Private

Files automatically deleted after conversion

How to Convert SMI to TTML

Upload SMI File

Click the "Select File" button to upload your smi file from your device.

Start Conversion

Click the "Convert" button to instantly start converting to TTML.

Download TTML

Download your converted ttml file immediately after processing.

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