Why this tool is useful
Create timed SRT captions from speech in an owned recording without sending the audio or generated subtitles to a transcription service.
Local File Tools · runs locally
Private Audio to SRT Subtitle Maker
Create timed SRT captions from speech in an owned recording without sending the audio or generated subtitles to a transcription service.
Ready. Your working data stays in this browser.
Files and capture streams stay on this device. Processing uses browser APIs only; nothing is uploaded to YTSave, the media API or a proxy. No server copy is created, stored or left to delete. The file picker is cleared when processing starts, and disposable worker memory is destroyed after completion or cancellation. Preview and generated-output memory is released when you clear the tool or leave the page.
How it works
A pinned local Whisper pipeline returns bounded timestamped speech chunks, which the browser validates and serializes as numbered SubRip cues with comma millisecond separators.
Practical example
Select a spoken MP3 or MP4, verify the generated cue boundaries and wording, then download a standards-shaped SRT file for your editor.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.