MP4 to SRT, Fast
Convert MP4 files to editable SubRip SRT in your browser, using OpenAI Whisper word timestamps and local audio extraction for privacy and accuracy.
mp4 subtitle converter quick steps
Start with a single MP4 upload and end with an edited SRT file ready for editors and publishing platforms. Follow three clear steps.
Upload MP4 and choose language
Select automatic detection or the spoken language so Whisper can produce word timestamps for accurate timed transcription.
Transcribe with local audio extraction
The browser extracts and compresses audio using FFmpeg WebAssembly, then sends chunks for ASR while keeping video frames local.
Review, edit, and download SRT
Edit cue text, line breaks, and timestamps in the preview, then export SubRip SRT, WebVTT, or TXT for editors or YouTube captions.
automatic srt generator features
Automatic speech transcription
OpenAI Whisper recognizes dialogue and returns word-level timestamps used to build synchronized subtitle cues compatible with SubRip SRT.
Local audio extraction
The browser extracts and compresses the audio track locally using FFmpeg WebAssembly before sending transcription chunks for ASR.
Readable SRT segmentation
Words are grouped around punctuation, pauses, cue duration, and line length so cues are natural and editor-ready, not arbitrary fixed intervals.
Editable SRT preview
Review and edit sequence numbers, timestamps, cue text, and line breaks in the browser before downloading a clean SRT file.
Long recording support
Long media is split into ten-minute audio chunks, transcribed in order, and merged into one continuous SubRip timeline with correct offsets.
Multiple spoken languages
Choose automatic language detection or select the spoken language to improve ASR results for multilingual interviews and courses.
mp4 captions maker benefits
Skip manual timestamps
Start with synchronized subtitle cues instead of typing dialogue and timing every line by hand, saving hours on captioning.
Keep video frames local
Only compressed audio chunks leave the browser, so your MP4 video frames remain on the device during the transcription process.
Import into common tools
Download SubRip SRT files that import into video editors, course platforms, media players, and caption workflows without conversion.
Improve accessibility
Add readable captions that follow WCAG principles so viewers can follow speech and understand recorded content across devices.
Create reusable text
Export the same transcription as TXT or WebVTT for transcripts, searchable archives, or publishing alongside video on YouTube and websites.
Work in a browser
Generate, review, edit, and download SRT without installing desktop software, using standard browser APIs and an intuitive editor.
video to srt transcription use cases
Caption interviews
Convert spoken interviews in MP4 into synchronized subtitles with editable dialogue and timing for journalism and research workflows.
Subtitle courses and tutorials
Create an SRT draft for lessons, demonstrations, and training content to make instruction more accessible and searchable.
Caption social video
Generate subtitle files for short-form clips, marketing videos, and creator content so captions display on social platforms and mobile.
Prepare editor imports
Download SubRip subtitles that editors can drop into NLE timelines or caption pipelines that accept standard SRT files.
Make archives searchable
Turn speech from older MP4 recordings into timed text for indexing, quoting, and fast review of meetings and field footage.
Support accessible playback
Add captions to recorded content so viewers can follow dialogue without relying only on audio, improving reach and compliance.
how to convert mp4 to srt online frequently asked
How do I convert MP4 to SRT?
Upload the MP4 file, choose the spoken language or automatic detection, start transcription, then review and download the SRT preview. The exported file is a SubRip SRT ready for editors and players.
Does the SRT include timestamps?
Yes. Whisper word timestamps are converted into numbered SubRip cues with start and end times, so the SRT aligns with video playback for accurate captions.
Can I edit SRT timings after conversion?
Yes. Select the SRT preview and edit its text, timestamps, sequence numbers, or line breaks in the browser editor before downloading a corrected file.
What happens with long recordings and how accurate is AI speech-to-text for MP4 files?
The browser splits audio into ten-minute chunks, transcribes each with OpenAI Whisper, and merges results into one timeline. Accuracy depends on audio quality, speaker clarity, and language choice, so review and correct cues as needed.
Can I also download TXT or VTT?
Yes. The same result can be previewed, edited, and downloaded as SubRip SRT, WebVTT, or plain TXT for transcripts or different publishing targets.
How do you keep video frames on my device while generating SRT?
SubTran extracts and compresses audio locally using browser APIs, so only audio chunks are sent for ASR while MP4 video frames remain on your device.
Which tool uses Whisper to make SRT files?
SubTran uses OpenAI Whisper for automatic speech recognition to produce word-level timestamps that are turned into readable SubRip cues.
How to generate readable subtitle cues from MP4?
SubTran groups words around punctuation, pauses, cue duration, and line length instead of fixed intervals, producing cues that are easier to read and edit for platforms like YouTube and player caption tracks.
convert mp4 to srt online now
Start converting MP4 to SRT with editable word timestamps and local audio processing for private, usable subtitles.