Drop an MKV and download SRT or VTT timed to what is said. This creates subtitles by listening to the audio; if your MKV already contains a subtitle track you only want to pull out, a remuxing tool does that without transcribing.
How it works
The file is read as it is. If it has several audio tracks, the first one is used, so put your voice on track one or upload the right track on its own.
The language is detected automatically. A one-hour recording is typically ready in a few minutes.
Name the SRT exactly like the video (film.mkv and film.srt) and most players load it automatically.
Extract or create
"MKV to SRT" means one of two things, and only one of them needs transcription:
ffmpeg -i film.mkv -map 0:s:0 subs.srt does it in seconds for text tracks. Picture-based tracks from discs need an OCR tool. You do not need this page for either.Not sure which you have? Open the file in VLC and look under the Subtitle menu. If it lists no tracks, there is nothing to extract.
OBS recordings
OBS records to MKV so that a crash does not ruin the file. Those recordings upload here as they are, with no remux to MP4 needed. Two settings make the subtitles noticeably better:
Then import the SRT next to the footage in DaVinci Resolve or Premiere Pro.
Sample output
1 00:00:34,680 --> 00:00:46,500 fourscore and seven years ago our fathers brought forth upon this continent a new nation conceived in in liberty, and dedicated to the proposition 2 00:00:46,500 --> 00:00:50,300 that all men are created equal. 3 00:00:50,300 --> 00:00:57,500 Now we are engaged in a great civil war, testing whether that nation, or any nation so conceived 4 00:00:57,500 --> 00:01:01,620 and so dedicated, can long endure. 5 00:01:01,620 --> 00:01:07,920 We are met on a great battlefield of that war we have come to dedicate a portion of that field 6 00:01:07,920 --> 00:01:14,240 as a final resting place for those who here gave their lives that their nation might live 7 00:01:15,360 --> 00:01:18,800 it is altogether fitting and proper that we should do this
Real output, unedited: a public-domain LibriVox reading of the Gettysburg Address (2 min 41 s) transcribed here in October 2026. The repeated word and the missing capitals are what came back; you would fix those on the transcript before downloading.
Before you rely on it
Each cue is a phrase from the transcript with its start and end time. Most run a few seconds. A passage spoken without a pause can come out as one long cue of up to about half a minute, so split those in your editor if your platform wants two short lines at a time.
Cue times are taken from the recording itself, so the file lines up with the video or audio you uploaded. If you trim the start of the video afterwards, shift the cues by the same amount in your editor.
On public test recordings, about 7 words in 100 differed from the reference for clean English read speech, between 4 and 9 in 100 for Spanish, Portuguese, Russian, French and German, and about 21 in 100 for Hindi. Noisy rooms, music and crosstalk do worse. Method and every number: the benchmark.
Open the transcript, correct a misheard name or number on its line, and the SRT and VTT you download carry the correction with the timing unchanged.
You get the subtitle file. Fonts, colours, position and captions drawn into the picture are done in your video editor or player, which reads this file.
Up to 10 hours or 5 GB per recording. The box on this page takes files up to 500 MB; larger ones continue on the upload page. 99+ languages, detected automatically.
Pricing
The preview is free. When the full transcript needs a pack, one-time packs are $4 for 500 minutes, $8 for 1,000 minutes, $12 for 2,000 minutes, $24 for 5,000 minutes. Credits never expire, which comes to about $0.29 to $0.48 per hour of audio.
| Recording | $4 or $8 pack | $12 pack | $24 pack |
|---|---|---|---|
| 25-minute episode | $0.20 | $0.15 | $0.12 |
| 2-hour film or recording | $0.96 | $0.72 | $0.58 |
| 4-hour OBS session | $1.92 | $1.44 | $1.15 |
Figures are the share of a pack each recording uses. A button opens secure checkout for that pack. Every export format is included; full details on the pricing page.
FAQ
If the MKV has no subtitle track, upload it here and download an SRT made from the speech. If it already contains a text subtitle track, extract it with MKVToolNix or ffmpeg instead; that needs no transcription.
No. It creates new subtitles from the audio. Use MKVToolNix or ffmpeg to copy an embedded track out of the file.
The first audio track. If the language or voice you need is on another track, extract that track and upload it on its own.
Up to 5 GB or 10 hours. The box on this page takes files up to 500 MB; larger ones continue on the upload page. Uploading only the audio is much faster for big files.
Yes. Put the SRT in the same folder with the same name as the video and VLC loads it automatically, or add it from the Subtitle menu.
Every page in this set uses the same upload box and the same export. All subtitle pages
Free preview. New subtitles from the speech in the file; packs from $4 when the full transcript needs one.