AI Subtitle Generator
Generate SRT subtitles from video audio with AI
What is AI Subtitle Generator?
AI Subtitle Generator is a free browser-based video tool from Farvixo that lets you generate SRT subtitles from video audio with AI. It uses an in-browser FFmpeg build compiled to WebAssembly, so even large clips are processed on your own machine and never uploaded. No account, no watermark and no per-file size limit imposed by a server.
How to use AI Subtitle Generator
Select a video file in AI Subtitle Generator. Conversion happens in your browser using WebAssembly, so even large files never get uploaded anywhere.
Choose the output format, resolution and bitrate — or start from a ready-made preset if you are not sure what to pick.
Start the conversion and watch the progress bar; longer clips take a little time because the work runs on your own machine. Download when it finishes.
Frequently Asked Questions
How accurate is the transcription?
Very good on clear speech with little background noise, and it degrades with accents, crosstalk, music beds and poor microphones. Always read through before publishing — an incorrect subtitle is worse than none, because viewers trust it.
Can I edit the text and timings?
Yes, and you should. Fix names, technical terms and any misheard words, and adjust timings so a caption does not appear before the line is spoken. Both are quick and both are noticed by viewers.
What format do I get?
SRT, which YouTube, Instagram, VLC, Premiere and essentially every player and platform accept. Upload it alongside your video rather than burning it in, so viewers can turn it off.
Why should I add subtitles at all?
Most social video is watched with sound off, so captions are the difference between being read and being scrolled past. They also make your content accessible to deaf and hard-of-hearing viewers, and search engines can read them.
Which languages are supported?
A wide range including English, Hindi and Bengali. Set the spoken language before transcribing — accuracy drops sharply when the model is listening for the wrong one.
What you can use AI Subtitle Generator for
- Getting a clip under the size limit for WhatsApp, Gmail, Discord or a course upload
- Converting a recording to a format a specific player, editor or platform accepts
- Editors who want a quick change without opening a full desktop suite
- Handling confidential footage that must not be uploaded to an online converter
AI Subtitle Generator at a glance
- Tool
- AI Subtitle Generator — Video Tools
- Purpose
- Generate SRT subtitles from video audio with AI
- Input
- A single file (MP4, WebM, MOV, AVI, MKV, MP3, WAV, M4A, AAC, FLAC, OGG, Opus)
- Output
- Video file in the selected container and codec
- Processing
- In your browser — files are never uploaded to a server
- Price
- Free, unlimited, no account required
- Limitations
- Bounded by your device's memory and CPU rather than a server quota; very large files may be slow on older hardware
Tips for better results
- Processing speed depends on your own CPU, since the work is local. A laptop on battery-saver will be noticeably slower.
- H.264 (MP4) is the safest choice for compatibility; VP9 or AV1 give smaller files but decode slowly on older devices.
- Leave the tab open and visible — a backgrounded tab gets throttled by the browser and the encode will crawl.
Common problems and how to fix them
The encode is very slow
Everything runs on your device rather than a server farm. Pick a lower resolution or a faster preset, keep the tab in the foreground, and close other heavy tabs.
The output has no sound
The chosen container cannot carry the source audio codec — WebM cannot hold AAC, for example. Re-encode the audio instead of copying the stream.
The browser ran out of memory
The clip is too large to hold in memory. Trim it into shorter segments and process them one at a time.
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