The workflow
How do you add subtitles to a Twitch clip?
Five steps, and only one of them is work.
- 1Open the clip in the Boltis editor.
- 2Open the Captions tab and click Generate captions. Boltis brings back every word with its own start and end time.
- 3Read them, and fix anything the transcription got wrong.
- 4Pick a style preset, then adjust the font, colour or outline.
- 5Export. The captions are burned into the vertical MP4.
Pricing
Are the captions free?
Yes. Captioning is part of the free version, with 30 generations per month. There is no credit balance to top up, and no watermark on the export. Premium removes the cap if you caption more than that.
This is the part most comparable tools charge for, and it is worth saying plainly rather than burying it: you can install Boltis, caption a clip, and export it without paying anything or entering a card.
Honest answer
How accurate are the automatic captions?
Accurate enough that editing is a quick read rather than a retype, and not accurate enough to publish unread.
The honest answer is that it depends entirely on your audio. Clear speech over quiet game sound transcribes very well. Speech buried under gunfire, music or three people shouting at once does not, and no transcription service on the market fixes that. Streamer audio is the harder end of the range, which is exactly why every word stays editable.
Boltis does not quote an accuracy percentage, because a single figure would be true for one kind of audio and misleading for the rest.
Editing
Can you edit the captions after they are generated?
Yes, and you should. Each word is a row you can click and retype.
- Change the text of any word
- Move a word start or end time
- Delete words, or add ones the transcription missed
- Drop in emoji from a small palette
Because the transcript carries a timestamp for every individual word, Boltis can also use it to find the silent gaps in a clip, which is how the editor suggests cuts to tighten it up.
Styling
What caption styles are available?
Eight presets, each a starting point rather than a fixed look. Once you pick one you can change the font, weight, colour, outline, shadow or glow, and capitalisation.
You then choose how the captions arrive on screen:
| Animation | What it does |
|---|---|
| Quirky | Each word pops in on its own, one at a time. |
| Quirky (sentence) | The whole phrase pops in together. |
| Grow per word | The phrase stays on screen and the word being spoken grows. |
| Typewriter | Characters appear as they are said. |
Subtitle files
Can you export captions as an SRT file?
Yes. Boltis exports .srt and .vtt. This is the part of the feature that is easy to miss, and the reason this page is worth reading even if you never export a video from Boltis.
Transcription produces one timestamp per word, which is right for animated captions and wrong for a subtitle file. Boltis groups the words into phrase-level cues before writing the file, splitting on the natural pauses in speech, which is the format Premiere Pro, DaVinci Resolve and CapCut expect. You get a subtitle file that imports cleanly rather than one cue per word.
1
00:00:00,480 --> 00:00:02,140
that was actually insane
2
00:00:02,300 --> 00:00:04,010
did anyone else see that
3
00:00:04,560 --> 00:00:05,900
clip it clip it clip itOther editors
Do captions work if you edit the clip somewhere else?
Yes. That is what the subtitle export is for. Clip the moment with the hotkey, generate the captions in Boltis, export the .srt, and take it to whatever you normally edit in. You do not have to render the video in Boltis to keep the transcript.
It also means Boltis is useful as a transcription step on its own. If you already have an editing setup you like, the captioning is still free and the file it produces is a standard one.