Free Online Captions &
Subtitle Converter

Convert and edit subtitle files — ASS, SRT, VTT. Edit text and convert formats directly in your browser. 100% private, zero uploads.

100% Free No Credit Card100% Private Files Stay On Device0% Watermark Clean Export

Caption Converter Studio

Convert subtitle formats, edit cues, and preview live in real-time.

Upload Subtitle File

Change subtitle format · SRT, VTT, ASS · Private & safe on your device

Select Subtitle File
AI Subtitle and Captions

Unlock AI-powered subtitles for your videos

The free caption converter is just the start. Log in to access our full platform — auto-generate subtitles from any video, translate to 50+ languages, and burn subtitles directly into your video with custom styles.

Upgrade Your Creative Studio

MonthlyAnnualSave 20% with annual

Free

For exploring AI video creation

₹0forever

No credit card required

200 starter credits
Get Started Free
Up to 720p export
Max 1 minute video duration
All export formats (SRT, VTT, ASS)
Standard AI generation models
Community & basic support
Watermark on exports

Starter

For individuals getting started

₹559₹699/mo20% OFF

Billed annually

1,000 credits / month
Up to 720p export
Max 1.5 minutes video duration
All export formats (SRT, VTT, ASS)
Email support
No watermark on exports

Creator

For active content creators

₹1,119₹1,399/mo20% OFF

Billed annually

2,000 credits / month
Up to 1080p export
Max 3 minutes video duration
All export formats (SRT, VTT, ASS)
Email support
No watermark on exports
Priority processing queue

Pro

For power users & professionals

₹2,799₹3,499/mo20% OFF

Billed annually

5,000 credits / month
Up to 1080p export
Max 10 minutes video duration
Advanced analytics
All export formats (SRT, VTT, ASS)
Dedicated support
No watermark on exports
Priority processing queue

Answers to your top questions

Need more help? hello@avnilabs.ai

We support SRT (SubRip), VTT (WebVTT), and ASS (Advanced SubStation Alpha) formats — both as input and output.

No! All parsing and conversion happens entirely in your browser. Your files never leave your device.

Yes! You can edit any caption text, adjust start and end times, add new cues, and delete existing ones — all before downloading.

ASS-specific styling (colors, fonts, positioning) is stripped during conversion since SRT and VTT don't support those style tags. The text content is fully preserved.

Since everything runs locally in your browser, there are no server-imposed limits. Very large files may take a moment to parse.