M4A to SRT — Convert Audio to SubRip Subtitles Online
Transcribe M4A audio into SRT (.srt) subtitles with AI. Free 2-minute preview, no account required. Download .srt/.vtt/.txt/.md.
99+ languages
auto-detected
2-min preview
always free
4 formats
vtt · srt · txt · md
500 MB
max upload
SRT (SubRip) remains the interchange format for editors, encoders and delivery pipelines — ffmpeg, HandBrake and most NLEs expect it. The catch has always been getting the text and the timing in the first place.
AudioToVTT transcribes your M4A directly into a clean, timestamped SRT file. The format keeps the familiar HH:MM:SS,mmm timecodes and numbered cues, so it works in any editor that reads SubRip.
No account, no subscription: preview the first 2 minutes free, then unlock the full export for $1.50 or 1 credit. M4A (AAC audio) and all other common formats are supported, including video containers.
M4A/AAC audio transcribed into precise SRT cue blocks
Comma-millisecond SRT timecodes (HH:MM:SS,mmm)
Free 2-minute preview before paying — risk-free
Same purchase also yields .vtt, .txt and .md
No signup, no subscription — $1.50 per export or 1 credit
Automatic long-file splitting at silence
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Free 2-minute preview, no account. Pay only when you export.
Frequently asked questions
Why do I need an SRT file? ▾
SRT is the most widely supported subtitle format — it works in video editors, encoders like ffmpeg or HandBrake, and most players. It uses comma-millisecond timecodes and numbered cues.
Can I convert audio inside a video file? ▾
Yes — we extract the audio track from MP4, WebM and MOV automatically, then transcribe it. Upload the video and get the subtitle back.
Are the timestamps accurate? ▾
Every cue carries precise start/end timestamps derived from speech detection, so subtitles stay in sync with your audio.