# AI Subtitle Generator > Generate timed SRT subtitles from a video's audio with AI transcription. Free, editable before export, and ready for YouTube or any player. - URL: https://farvixo.com/tools/video/ai-subtitle-generator - Category: Video Tools (https://farvixo.com/tools/video) - Price: Free - Last reviewed: 7 August 2026 - Publisher: Farvixo Technologies ## 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. ## Specifications | Property | Value | | --- | --- | | 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 | ## How to use AI Subtitle Generator 1. **Load your video** — Select a video file in AI Subtitle Generator. Conversion happens in your browser using WebAssembly, so even large files never get uploaded anywhere. 2. **Pick format and quality** — Choose the output format, resolution and bitrate — or start from a ready-made preset if you are not sure what to pick. 3. **Convert and save** — 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. ## Use cases - 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 ## Tips - 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 - **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. ## FAQ ### 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. ## Related tools - [Video Converter](https://farvixo.com/tools/video/video-converter): Convert videos to MP4, WebM, MKV, MOV, GIF or extract MP3/AAC — AI analysis, batch queue, social presets, 100% private FFmpeg in your browser - [Video Compressor](https://farvixo.com/tools/video/video-compressor): Shrink videos to a target file size — hit 16 MB for WhatsApp or 25 MB for email with two-pass encoding, live size prediction and no visible quality loss, 100% private in your browser - [Video Trimmer](https://farvixo.com/tools/video/video-trimmer): Cut and trim video clips precisely - [Video Merger](https://farvixo.com/tools/video/video-merger): Join multiple videos into one file - [Video Splitter](https://farvixo.com/tools/video/video-splitter): Split a video into equal parts - [Video Watermark](https://farvixo.com/tools/video/video-watermark): Add text watermarks to videos --- > Machine-readable index: [llms.txt](https://farvixo.com/llms.txt) · full corpus: [llms-full.txt](https://farvixo.com/llms-full.txt) · agent skill: [skill.md](https://farvixo.com/skill.md). 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