Timed SRT, not a flat transcript
Every caption block comes back with real start and end timecodes lifted from the speech in your file — a proper .srt subtitle file, not a wall of text you have to time by hand.
5 free SRT files — no watermark, no credit card
Audio to SRT
Upload an MP3, WAV or any audio or video file and get a timed SRT subtitle file in seconds. Download the SRT, or export VTT or plain text — with 5 free SRT files and no credit card.
Best-in-class AI accuracy
MP4, MOV, WebM, MP3, WAV, M4A, FLAC, or OGG · 100+ languages
Leave on Auto-detect, or pick the spoken language for a hint.
Drag and drop your file here, or click to upload
MP4, MOV, WebM, MP3, WAV, M4A, FLAC, OGG
Why use this audio-to-SRT converter
Most “free” subtitle sites cap you at a minute, add a watermark, or hand back untimed text. This one gives you a proper timed SRT subtitle file — plus VTT and TXT — for free.
SRT, VTT and TXT in one click
Convert once and download a standard .srt subtitle file, a .vtt caption file for the web, or a plain-text .txt transcript — whichever your editor or platform needs.
100+ languages, 5 free files
Convert audio to SRT in 100+ languages online. 5 free SRT files — no install, no watermark, no credit card.
How it works
Get an SRT in three steps
- 1Upload your audio or video file (MP3, WAV, M4A, MP4 and more).
- 2Pick the spoken language so the AI times it accurately.
- 3Download your subtitles as SRT — or grab VTT or TXT instead.
What people use it for
From audio to ready-to-use subtitles
- Caption a podcast or interview by dropping the SRT straight into your editor
- Generate ready-to-upload subtitles for a YouTube video from its audio
- Subtitle a voiceover or webinar recording without timing captions by hand
- Produce an SRT for accessibility and compliance from any audio file
Subtitle at scale
Need longer audio or captions in your editor?
The free tool above gives you 5 SRT files of up to 5 minutes each. CaptionX Pro unlocks unlimited, watermark-free SRT subtitles for longer audio — and generates styled, animated captions directly inside Adobe Premiere Pro.
CaptionX Pro includes
- Unlimited SRT files, not just 5 free
- Longer audio, no length cap
- 100+ languages — all included
- Styled captions inside Premiere Pro
- No watermark, monthly or yearly
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Open toolFrequently asked questions
How do I convert audio to an SRT file?
Upload your audio file using the tool on this page, select the spoken language, and click Transcribe to Text. The AI returns timed captions — click Download .srt to save a standard SRT subtitle file. You can also export VTT or plain text. A free CaptionX account includes 5 SRT files — no credit card needed.
Can I convert an MP3 to SRT for free?
Yes — it's free. You get 5 free SRT files with a free CaptionX account, and no credit card is needed. Each file can be up to 5 minutes. No watermark, ever. After your 5 free files, a CaptionX subscription makes them unlimited.
Is the SRT timed and ready for YouTube or my editor?
Yes. Every caption block in the SRT carries real start and end timecodes from the speech in your file, so it imports cleanly into YouTube, Premiere Pro, DaVinci Resolve, CapCut, Final Cut and any player that reads .srt.
What audio and video formats can I upload?
You can upload MP3, WAV, M4A, FLAC and OGG audio, or MP4, MOV and WebM video, up to 500 MB per file. The audio track is transcribed and timed into SRT either way.
Can I also get VTT or plain text from my audio?
Yes. Alongside the .srt download you can grab a .vtt caption file for the web, or a plain-text .txt transcript with the timestamps stripped — all generated from the same upload in one pass.
Does it support languages other than English?
Yes. The converter handles 100+ languages including Spanish, Portuguese, French, German, Arabic, Hindi, Japanese, Korean, Chinese and more. Just pick the spoken language before you convert and the SRT comes back in that language.
What if my audio is longer than 5 minutes?
Free accounts can convert files up to 5 minutes of audio. For longer recordings and unlimited, watermark-free subtitles — plus captions directly inside Adobe Premiere Pro — see CaptionX Pro.
Convert your audio to SRT — free
Upload a file above for an instant SRT subtitle file, or get CaptionX Pro for unlimited subtitles and captions inside Premiere Pro.