Upload your lesson videos or their audio and download one caption file per lesson, in the format your course platform takes. A twenty-lesson course is an afternoon, not a week.
How it works
One file per lesson. Audio-only exports are quicker to upload and give the same captions. Signed in, you can add many files at once or import a Google Drive folder.
Course vocabulary is where errors cluster: technical terms, product names, your own name. Fix them on the transcript.
Download .vtt or .srt for each lesson and upload it in the lesson's caption settings on your platform.
Which format each platform wants
.vtt per lecture and per language. Udemy's automatic captions cover only some languages and are worth replacing when your subject has specialist terms.Since both formats come from the same transcript at no extra charge, download both and keep them with the lesson's source files.
Why course captions pay for themselves
Screen recordings with one clear voice are the easiest audio to transcribe. Lessons recorded in a classroom with questions from the room need a closer check.
Sample output
WEBVTT 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 00:00:46.500 --> 00:00:50.300 that all men are created equal. 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 00:00:57.500 --> 00:01:01.620 and so dedicated, can long endure. 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 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 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. A four-hour course fits in the smallest pack with half of it left over.
| Recording | $4 or $8 pack | $12 pack | $24 pack |
|---|---|---|---|
| One 10-minute lesson | $0.08 | $0.06 | $0.05 |
| 20 lessons of 12 minutes (4 hours) | $1.92 | $1.44 | $1.15 |
| A 30-hour programme | $14.40 | $10.80 | $8.64 |
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
Udemy accepts WebVTT (.vtt) caption files, uploaded per lecture and per language from the course's Captions page.
Upload each lesson as its own file. Signed in, you can add many files together or import a Google Drive folder, then download a VTT or SRT per lesson.
Yes. With credits on the account, the download menu translates a lesson's subtitles into 35 languages as SRT with the original timing. Convert to VTT in the browser where a platform needs it.
Accessibility rules ask for accurate, synchronised captions. A file made here and reviewed by you meets that description; an unreviewed automatic track from any tool generally does not.
Usage is per minute of audio. Twenty 12-minute lessons are 240 minutes, under half of the $4 pack of 500 minutes.
Every page in this set uses the same upload box and the same export. All subtitle pages
Free preview. VTT and SRT per lesson; packs from $4, credits never expire.