Video subtitles

Each video in a presentation can have its own subtitles with timing and styling — works across the editor, Present mode, and MP4 export.

How to open the editor

1. Insert a video in the slide (toolbar → 🎬)
2. In the right properties panel, a Subtitles section appears below Video
3. You see:
   • Embedded video with live preview of the active cue
   • List of cues (timing + text)
   • Add buttons
   • Collapsible "Subtitle style" and "Advanced actions" sections

Adding a cue (subtitle)

3 ways:

1. @ {time} + (blue button) — adds a cue at the current video playback time. You then type the text.
2. + (border button) — adds a cue at the end (startMs = endMs of the last, duration 2 s).
3. Auto-distribute from text (in Advanced actions) — paste text, splits into sentences, distributes evenly across video duration.

Each cue has:

• Start (time as mm:ss.s) — click 🕒 to insert current video time
• End (time as mm:ss.s) — same
• Textarea with subtitle text
• 🗑 remove

The active cue (currently showing) is highlighted in brand color.

Subtitle style (global per video)

The Subtitle style section (collapsible) lets you set:

• Font — dropdown same as text objects
• Size — slider 2–15% of video height (default 5%)
• Bold / Italic — toggle
• Text color — color picker, default white
• Background color — color picker + opacity slider (default #000 70%)
• Position — top / bottom (default bottom)
• Alignment — L / C / R (default C)
• Padding + Radius — for background box

Size relative to video = scales with video size. Same style works whether the video is small or covers the whole slide.

Reset to defaults — button at the bottom clears everything.

Per-cue style override

Each cue can override the global style for itself:

1. Click 🎨 (Palette) icon on the cue row
2. A violet panel opens with controls:
   • Size / Bold / Italic
   • Text color / Background color
   • Position (top / bottom)
3. Each property has × to remove (back to global style)
4. Reset button at the top = clear all per-cue overrides

Use case: main text white, one key cue red and larger for emphasis.

AI cue translation

Language tabs above the cue list:

• Primary | EN | DE | ... | + Add
• Click a tab to switch the whole cue list to that language (edit translation)
• × on the tab removes the language from all cues (with confirmation)
• + Add opens a dropdown with remaining languages (en/de/fr/es/it/pl/sk/uk)

When you switch to a non-primary language, a violet "Translate AI ({lang})" button appears. Click:

1. Sends the text of all cues to AI translation
2. Saves the translation with each cue
3. Pre-fills the textareas — you can edit manually

Cost: translation uses AI credits according to the length of the text — see the current price list in AI credits — how they work.

Indicator in primary view — under each cue, small green badges (EN, DE, ...) show which languages it's already translated to.

Advanced actions

Collapsible "Advanced actions" section with 3 tools:

1. Auto-distribute from text (✨)

Paste text → splits into sentences (. ! ?) → distributes evenly across video duration. Requires loaded video (for duration).

2. Import VTT / SRT (📥)

Paste .vtt or .srt file content. Auto-detects format. Supports:

• VTT with WEBVTT header
• SRT with sequence numbers
• HH:MM:SS.mmm and MM:SS.mmm timestamps

3. Export VTT / SRT (📤)

2 buttons → copies formatted content to clipboard (✓ indication 1.5s).

Preview in the editor

In the main canvas, the subtitle is shown directly over the video — you see exactly how it looks in the slide context (other object positions, animations, etc.).

Toggle at the top of the Subtitles section: Preview in editor ON/OFF — if subtitles get in the way when positioning surrounding elements, turn it off. The choice is remembered in your browser.

Rendering — where subtitles appear

In Present mode and export, subtitle language is shared with slide narration captions — one choice for the whole presentation.

Embedded video captions vs. script captions: the captions you set up here for a video are always burned into the MP4. Captions from the slide script (narration) are burned into the MP4 only when you tick Burn captions into video in the Export & Share dialog.

Tips

• Short cues (< 5 s) are easier to follow
• Size 4–6% of video height — readable without overwhelming content
• Background alpha 70–80% gives better text contrast over varied videos
• AI translations always review manually — model occasionally misses context
• Auto-distribute is a quick start, but manually adjust timing for better sync with spoken word in the video