AI Subtitle Organizer

AI Auto Subtitles: The Complete Workflow from Speech Recognition to Subtitle Export

The most time-consuming part of subtitling a video usually isn’t the typing, it’s syncing each line to the timeline. This tool uses the Whisper speech recognition model to produce a time-coded first draft, then gives you a convenient editing interface to turn the results into ready-to-use subtitles. It’s well suited to YouTube creators, podcasts, teachers recording lessons, and anyone who needs transcripts of meetings or talks.

Recognition modes: cloud-accelerated and on-device

The tool offers two ways to run recognition, so you can choose what fits your needs:

• Cloud-accelerated recognition (on by default): Audio is sent to this site’s Whisper service hosted on Cloudflare Workers AI for recognition. It’s faster and works smoothly on phones too. After processing, the audio is not kept or used for anything else by this site; see the Privacy Policy for details. If the cloud quota runs out or the connection fails, the tool automatically switches to the on-device engine.
• On-device recognition: Uncheck “Use cloud-accelerated recognition” and the AI model is downloaded to your browser and runs on your device, so the audio never leaves the browser. The model must be downloaded the first time; after that it loads from cache.

Recommended settings

• Language: If you know the video’s language, specifying it prevents the model from guessing wrong; use “Auto-detect” only when languages are mixed or you’re not sure.
• Recognition quality: “Standard” balances speed and accuracy and suits most content; “High accuracy” is slower and best used on a desktop, ideal for videos with lots of technical terms or poor audio.
• Chinese subtitle script: The Whisper model outputs Chinese in Simplified characters by default; choosing “Traditional Chinese” converts it to Traditional automatically.
• If you already have a subtitle file, you can “import an existing SRT file” to skip recognition and use only the editing and export features.

Tips for editing subtitles

• Click any subtitle text to edit it; pressing Enter at the cursor splits the subtitle into two, while Shift + Enter adds a line break within the same subtitle.
• When a sentence has been chopped up too much, use “Merge next” to join two segments back together.
• Timecodes are collapsed by default; expand them only when you need to fine-tune, which keeps the view uncluttered.
• “Filler check” highlights verbal tics and filler words so you can clean them up in one go and make your subtitles easier to read.
• Editing while playing the media preview on the left is the easiest way to spot recognition errors.

Choosing an export format

SRT is the most universal subtitle format and can be imported by most platforms and editors, including YouTube, Premiere Pro, DaVinci Resolve and CapCut; VTT suits HTML5 video players on web pages; TXT is a plain-text transcript without timecodes, ideal for meeting minutes or rewriting into an article. You can also “Copy All Text,” or “Burn Subtitles to MP4” to produce a video with the subtitles built in.

Tips for better recognition accuracy

• The clearer the audio, the better: loud background music or several people talking at once will reduce accuracy.
• Names of people and places, and technical terms, are easily misrecognized; after recognition, use your browser’s search to check them one by one and correct them consistently.
• On-device recognition on iPhone and iPad is still experimental. If the page reloads, use cloud acceleration or generate the subtitles on a computer instead, and then use your phone just for editing.