Auto Subtitles · Burned In · Free

Add Subtitles to Video
— Free, Burned In, No Watermark

Upload your audio and we transcribe it, build your video, and burn subtitles permanently into every frame — so your captions show up on every platform, even with the sound off.

Add Subtitles Free Just need an SRT file?

Two ways to get subtitles — pick yours

⚡ Full pipeline — audio to video with subtitles

Upload your MP3 or WAV. We transcribe it, find stock footage per sentence, and return a complete video with subtitles permanently burned in.

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📄 Just the SRT file — no video needed

Already have a video? Use our free subtitle generator to create an SRT file from your script. Download and import it to your editor.

Free SRT generator →

Why burned-in subtitles beat soft subs

85% of social media video is watched without sound. Burned-in captions are always visible.

❌ Soft subtitles (SRT/VTT files)
Only show if the viewer turns them on
Not embedded in the video file itself
Hidden by default on most platforms
Don't show in video thumbnails or previews
Often ignored on social feeds
✅ Burned-in subtitles (what we create)
Always visible — no user action needed
Permanently part of the video file
Show in previews, stories, and shares
Work on every platform without a separate file
Optimised for muted social media scroll

How auto subtitles work in ZinAIStudio

1
Upload audio
MP3, WAV, or M4A. Your voice recording, podcast clip, or narration track.
2
AI transcribes with timing
Vosk AI generates a timed transcript — every word gets a precise start and end timestamp.
3
SRT generated automatically
We produce an SRT subtitle file from the transcript, sentence by sentence, synced to your audio.
4
Subtitles burned into video
FFmpeg bakes the captions directly into every frame of the final MP4. The SRT file is also available to download separately.

Subtitle questions answered

Can I add subtitles to an existing video file?
Currently ZinAIStudio creates new videos from audio + stock footage. If you want subtitles on an existing video, use our free SRT generator to create the subtitle file, then import it into CapCut or DaVinci Resolve.
What subtitle style is used?
White text with a subtle dark shadow — the standard style that's readable on any background, on any screen size.
Can I edit the subtitles before the video is generated?
Yes. After transcription, you can review and correct the text before the video is assembled.
Are the subtitles accurate?
Vosk achieves 90%+ accuracy on clear English audio. The review step lets you fix any errors before burning them in.
Can I download just the SRT file?
Yes. After your video is generated, the project dashboard lets you download the SRT file separately.
Do platforms like Instagram and TikTok recognise burned-in subtitles?
Yes — since they're part of the video image, they display identically on every platform, in every feed, and in every preview.

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No credit card required. Generate your first reel in under 5 minutes.

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