Video Subtitle Generator & Caption Generator

Upload a video, get back accurate, properly paced SRT and VTT subtitle files — free tier included, no card required.

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MP3, WAV, M4A, AAC, OGG, OPUS and more · up to 100 MB on the free plan

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Meetings and calls up to 30 minutes free — longer on paid plans

Free account · 60 trial minutes, then 30 minutes a month · no credit card required

Most video today is watched with the sound off. A subtitle or caption file is what keeps your video understandable in a feed, in a lecture hall with a hearing-impaired student, or on a phone in a quiet office — and it's also what search engines and platform algorithms use to index what your video is actually about. Transkio turns any video file into a downloadable subtitle track without you having to type a single line of timecode by hand.

Upload your video and Transkio transcribes its audio track, then formats that transcript into properly paced subtitle cues — split at natural word boundaries, kept within readable character and duration limits per cue — and exports it as an SRT or VTT file ready to hand to your video editor, LMS, or upload directly to YouTube. You can review and correct the transcript first, so what ends up burned into your captions is exactly right.

Manually Timing Captions Eats Hours You Don't Have

Writing subtitles by hand means transcribing the video, then guessing at timestamps, then nudging each cue back and forth in an editor until the words line up with the audio. For a 10-minute video that's easily an hour of tedious work, and it's the first thing that gets skipped when a deadline is tight — which is how videos end up published with no captions at all, locking out viewers who are deaf, hard of hearing, or just watching muted on the train.

Upload Once, Export a Synced Subtitle File

Transkio listens to your video's audio track, generates a full transcript, and automatically paces it into subtitle cues — timed to the audio and split so no cue is a wall of text or a flash of one word. Fix any misheard names or terms in the editable transcript, then export as SRT or VTT and drop the file straight into your editing software, video host, or course platform.

What You Get

Free SRT and VTT Export

Caption export isn't locked behind a paid tier — every Free account can export SRT and VTT files, up to 60 trial minutes then 30 minutes a month.

Properly Paced Cues, Not a Wall of Text

Subtitles are split at natural word boundaries and kept within readable character and duration limits per cue, so viewers aren't stuck reading a paragraph in two seconds.

Edit the Transcript Before You Export

Click any line to jump the video player to that moment, fix a misspelled name or technical term, and rename speakers — your corrections carry straight through to the caption file.

Works From a Direct Upload, No URL Fetching

Upload the video file itself — MP4, MOV, WebM, MKV, or MPEG — and Transkio pulls the audio track for you. There's no link-paste shortcut, so keep your source file handy.

50+ languages

Transcribe lecture recordings, product demos, and interviews in dozens of source languages and get accurate captions back in that same language.

Same Transcript Powers Captions and a Readable Script

The transcript behind your subtitle file is also a clean, readable document on its own — useful for show notes, a blog recap, or an accessible text version of the video.

See it work

See the Difference

A real example of how the same recording reads before and after Transkio.

Lecture captioning example

Before — raw auto-captions

so today were gonna talk about uh cellular respiration and uh specifically how mitochondria uh produce energy for the cell

After — Transkio transcript

1 00:00:00,000 --> 00:00:03,500 So today we're going to talk about cellular respiration — 2 00:00:03,500 --> 00:00:07,000 specifically how mitochondria produce energy for the cell.

Frequently asked questions

Is a caption generator the same thing as a subtitle generator?

Yes — on Transkio, captions and subtitles come from the same transcript and the same export step. Whichever word you use, you'll end up with a timed SRT or VTT file synced to your video's audio.

Does adding captions actually help with accessibility compliance?

Captions are the core requirement in most accessibility standards for video, since they give deaf and hard-of-hearing viewers access to spoken content. Transkio exports a standard SRT or VTT file you can attach to your video wherever it's hosted to meet that requirement.

Is SRT and VTT export available on the free plan?

Yes. Every Free account can export TXT, SRT, VTT files, with 60 trial minutes to start and 30 minutes included every month after — no card required.

Can I get translated subtitles in another language?

Not yet. Transkio's translation feature (available on Pro and above) produces a translated text transcript, but SRT/VTT subtitle export is currently original-language only — the captions match the language spoken in your video.

What video formats can I upload?

MP4, MOV, WebM, MKV, and MPEG are all supported. Upload the file directly — Transkio pulls the audio track from it automatically, so there's no need to extract or convert audio yourself first.

Get Captions on Your Next Video in Minutes

Upload a video, review the transcript, and export a properly paced SRT or VTT file — free tier included, no card required.

Transcribe for free

30 free minutes, no card required
Transcripts in minutes, not hours
50+ languages