Upload your video or audio file. AI transcribes it and downloads an SRT subtitle file ready to upload to YouTube — no account required.
MP3, MP4, WAV, M4A, FLAC, OGG, or WebM · Max 25 MB · No account required
Match the spoken language for transcription — or pick a different language to translate the subtitles automatically.
Drag and drop your file here, or click to upload
MP3, MP4, WAV, M4A, FLAC, OGG, WebM · Max 25 MB
How it works
Generate the subtitles right here in your browser. The SRT file it produces goes straight into YouTube Studio — no extra tools, no account, and no manual formatting required.
Drop in your file and CaptionX transcribes the speech automatically in your chosen language — no manual typing and no timeline.
Get a properly formatted .srt subtitle file — the standard format YouTube accepts. The same SRT works with Vimeo and every other major platform.
In YouTube Studio, open Subtitles for your video, click Upload file, and select the .srt. YouTube applies the timed subtitles immediately.
YouTube's own auto-captions are convenient for English content but fall short for multilingual creators, accented speech, and content where accuracy matters.
YouTube's built-in auto-captions cover a limited set of languages. CaptionX generates accurate subtitles in 100+ languages, including Arabic, Hindi, Urdu, Indonesian, Thai, Vietnamese, and many more — so your content reaches a global audience.
YouTube auto-captions are convenient but often inaccurate for accented speech, fast talkers, and non-English content. CaptionX uses AI transcription tuned for accuracy — the output is ready to upload without manual correction.
CaptionX exports a properly formatted SRT file that YouTube accepts without modification. There is no intermediate formatting step, no download from an external site, and no manual cleanup needed.
YouTube subtitles are uploaded as an SRT file, so this generator produces a clean, standards-compliant .srt with correct line lengths and timing — the exact format YouTube Studio accepts under Subtitles → Upload file. No reformatting, no cleanup, no watermark.
Already published the video and want accurate subtitles instead of YouTube's rough auto-captions? Download your own video from YouTube Studio (or use the original file), drop it into the generator above, and it transcribes the speech and hands back a timed SRT. Back in YouTube Studio, open Subtitles for that video, click Upload file, and pick the SRT — your accurate track replaces the automatic one.
Because the SRT keeps the original timing, the subtitles stay in sync with the video that's already live — no re-upload of the video itself required.
Free, in your browser
Use the generator above to create YouTube subtitles free — no account and no watermark. Need unlimited generations or to caption inside Adobe Premiere Pro? See the Pro plans.
What you get
Translate for a multilingual audience
Upload the SRT you just downloaded into the Subtitle Translator, pick a target language, and upload the translated .srt back to YouTube Studio as an additional subtitle track — no signup, cue timings preserved.
For YouTube Shorts
An uploaded SRT is ideal for long-form YouTube videos. For YouTube Shorts, use the auto caption generator to add animated captions directly onto the video and export a captioned MP4 — the on-screen caption style that performs on Shorts.
Upload your video or audio to the generator above and CaptionX transcribes it automatically, then downloads an SRT file. In YouTube Studio, open Subtitles for your video, click Upload file, and select the SRT. Editing in Premiere Pro? Caption X works there too.
Yes — the generator on this page is free to use with no account required. For unlimited generations or to caption inside Adobe Premiere Pro, see the Pro plans.
CaptionX generates YouTube subtitles in 100+ languages, including English, Spanish, Portuguese, French, Arabic, Hindi, Urdu, Indonesian, Thai, Vietnamese, Japanese, Korean, and many more.
Yes. YouTube generates automatic captions for supported languages, but the accuracy varies and language coverage is limited. For non-English content or when accuracy matters, generating your own subtitle file with CaptionX and uploading it gives much better results.
YouTube accepts SRT (.srt), VTT (.vtt), and other formats. CaptionX generates SRT files, which are the most widely supported format and work across YouTube and every other major platform.
YouTube's auto-captions can struggle with accents, technical vocabulary, non-English speech, and background noise. CaptionX uses AI transcription tuned for accuracy across languages and content types.
For YouTube Shorts, on-screen burned-in captions work best. Use the CaptionX auto caption generator to add animated captions directly onto your video and export a captioned MP4, then upload it to Shorts. For long-form videos, an uploaded SRT subtitle track is the better fit.
Yes. The tool generates a standard .srt subtitle file — the exact format YouTube Studio accepts under Subtitles > Upload file. Upload your audio or video and it produces a timed SRT you can drop straight into YouTube, or reuse in Premiere Pro, Vimeo, and any other editor that reads SRT.
Yes. Download your own video from YouTube Studio (or use the original file), drop it into the generator, and it produces a timed SRT. Then in YouTube Studio open Subtitles for that video, click Upload file, and select the SRT — it replaces YouTube's rough auto-captions with an accurate, correctly-timed track.
Burn animated, on-screen captions onto a video and export a captioned MP4 — ideal for YouTube Shorts.
Open toolTranslate your downloaded SRT into another language and upload it as a second YouTube subtitle track.
Open toolGenerate a clean SRT from audio or video for any platform — not just YouTube.
Open toolConvert your YouTube SRT to WebVTT for HTML5 video players and other web platforms.
Open toolCreate a properly formatted .srt subtitle file from your audio or video in seconds.
Open toolPaste a YouTube URL and get the full video transcript — copy it or download as TXT, SRT or VTT.
Open toolSee how CaptionX stacks up against other caption and subtitle generators side by side.
Open toolFree, no account and no watermark — your SRT is ready to upload to YouTube Studio.