Telegram URL: Paste a link from a public channel or group. The system detects videos and offers media selection.
Validation: Format, size (max 500 MB / 750 MB for dev), and duration (max 30 min / 60 min for dev) are checked before analysis. No minutes are deducted if validation fails.
UI: Progress indicator during upload. The editor is locked during analysis. The video loads into the player automatically when ready.
5.2 Trimming
Select a segment to keep (green) or remove (red).
Recommendation: Trim before AI processing to save time and minutes.
Drag handles for instant visual preview.
6. AI Tools
6.1 Language Detection & Transcription
Automatic language detection after upload.
Two-step AI processing: transcription (Deepgram – word-level accuracy) → refinement (Gemini – formatting and correction).
Word-level timestamping ensures precise timing – no manual time adjustment needed.
20+ target languages supported.
A custom subtitle processor assembles subtitles according to readability rules.
6.2 Automatic Summary
After subtitle generation, the app creates an AI summary of the video content.
6.3 Profile Editor
Intelligent profiles automatically adjust subtitle appearance based on video aspect ratio.
3 built-in profiles: Standard (16:9), Reels/TikTok (9:16), Square (1:1).
Auto-detected but manually switchable.
7. Subtitle Editor
The editor is organized into panels accessible from the floating toolbar.
7.1 Timeline
Visual display of all subtitles on a timeline.
Playhead (red line): Shows current video position.
Controls: Zoom in/out, play/pause.
Navigation: Click a subtitle in the list (left panel) to jump to its time. Use "Previous" / "Next" buttons to browse subtitles.
Split: Double-click a subtitle on the timeline to split it into two.
Delete: Cross button in the top-right corner of a segment.
Add: "+" button inserts a new subtitle at the current time.
No manual timing needed – Deepgram word-level timestamping ensures accurate synchronization. The subtitle processor assembles subtitles automatically.
7.2 Style Settings
Text: Font selection (Google Fonts), color (palette), brightness, size.
Real-time preview: Changes are instantly reflected in the player (canvas redraws the current frame only).
7.3 Watermark
Toggle watermark on/off.
Position: 9 presets (corners, edges, center).
Size: Percentage of video width.
Opacity & Margin.
Custom logo: Upload your own image or revert to the default SublyAI logo.
Brand protection: Watermark is forced visible when minutes are below 15.
7.4 Content Editing
Click a subtitle in the list (left panel) or directly on the video canvas to open the inline overlay editor.
The editor appears as a text input field positioned exactly where the subtitle sits on the video, matching its font, size, color, and background.
Auto-save: Changes are saved automatically 500 ms after you stop typing.
Enter (without Shift) saves and closes the editor. Escape closes without saving.
Video playback pauses automatically when editing and resumes when you close the editor.
7.5 Keyboard Shortcuts
Spacebar: Play / Pause
Arrow keys: Seek video
8. Export & Formats
8.1 Video with Subtitles (Hardcoded)
Subtitles are burned into the video image.
Formats: MP4, WebM, MOV.
Resolutions: 480p, 720p, 1080p, 1440p, 2160p.
Quality: Original, Low, Balanced, High.
Progress bar with percentage display during rendering.
8.2 Clean Video (No Subtitles)
Export video with watermark only, without subtitles.
8.3 Subtitle Files
SRT / VTT: Download external subtitle files.
8.4 Upload Own Subtitles
If you already have subtitle files (.srt / .vtt) from another source, you can upload them directly – no AI processing needed.
When to use: You have existing subtitles and only need styling, watermark, export, or burn-in.
Where: In the import step, click "Upload own subtitles (FREE)" and select your .srt or .vtt file.
What happens: The app skips AI transcription entirely. Your subtitles are loaded as-is into the editor.
What you can still do: Edit text, change style/position, add watermark, adjust timing, trim video.
Cost: Free – no minutes consumed.
9. Minutes & Pricing
9.1 What is Free
Uploading own subtitles (.srt / .vtt).
Styling, watermark, and video export.
Clean video export (without subtitles).
9.2 What Costs Minutes
Only AI subtitle generation and transcription.
9.3 Deduction
Minutes are deducted only when AI successfully generates subtitles for a video.
9.4 Buying Minutes
You can purchase additional minutes from the Minutes & Billing page in your dashboard.
9.5 Refunds & Claims
Minutes are deducted only for successfully generated subtitles.
If generation fails due to a server-side technical error, no minutes are deducted.
If minutes are deducted unfairly, contact us via the "Report Bug" link in the app footer.
10. Validation & Limits
Production limits: 30 minutes duration, 500 MB file size.
Development limits: 60 minutes, 750 MB.
External sources (Telegram): Supports videos from public channels and groups.
Validation: Input is validated immediately after upload. If the format or parameters do not meet requirements, the app notifies you before analysis. No minutes are deducted.
11. Support & Bug Reports
Use the "Report Bug" link in the app footer if you encounter an issue.
Describe the problem and optionally upload debug audio/video for analysis.
Use the same form to request a refund if minutes were deducted unfairly.
For general support, use the contact form at Dashboard → Support.