An audiogram is a short video made from audio: a background, moving sound bars and captions, so a podcast excerpt can be shared where video plays. Upload a trimmed clip, keep captions on, choose a frame shape and download an MP4. The tool does not pick highlights, edit multiple tracks or publish to social platforms.
See real examples
- Landscape caption video for a short voice clip
- Speech with background music: compare raw and reviewed captions
Practical use cases
How do I turn a podcast highlight into a vertical video?
Trim the highlight, upload it in Create video, enter the episode title, upload cover art and choose 9:16. Keep captions and the spectrum on, generate, correct names in the caption editor, then download the MP4.
Best for a short excerpt with one or two clear voices. Background music remains in the audio and may reduce recognition accuracy.
Specs and free limits
| Input | MP3, WAV, M4A, AAC, FLAC, OGG; MP4, MOV, WebM or MKV with sound (soundtrack only) |
|---|---|
| Maximum size | 100 MB per file |
| Maximum length | 10 minutes per file |
| Output | MP4 (H.264 video, AAC audio) |
| Frame and resolution | 9:16, 16:9 or 1:1 at 720p or 1080p |
| Recognition languages | English, Chinese, Japanese, Korean, Spanish, French, German or automatic detection |
| Watermark | None |
| Sign-up | Not required |
| File retention | Deleted after 24 hours |
| Price | Free; shared queue and hourly usage limit |
Supported formats
MP3, WAV, M4A, AAC, FLAC and OGG; MP4, MOV, WebM and MKV with sound. Optional JPG, PNG or WebP cover image. Export H.264/AAC MP4 in 9:16, 16:9 or 1:1 at 720p or 1080p.
How it works
1. Trim a self-contained clip
Cut the excerpt you want to share in your audio editor first, ideally from 30 seconds to a few minutes. Files are limited to 10 minutes and the tool does not choose highlights.
2. Upload and set the episode look
Open Create video, upload the clip and enter the episode or show name as the title. Choose a theme or upload cover art (JPG, PNG or WebP up to 5 MB), and keep the audio spectrum on.
3. Choose captions and frame
Keep captions enabled and select the spoken language. Use 9:16 for vertical feeds, 1:1 for square posts or 16:9 for YouTube; one caption line at the bottom suits landscape.
4. Review and download
Generate, correct names and caption timing in the caption editor, render again if needed and download the MP4. Post it yourself on your chosen platform.
Is it right for you?
Good fit
- Promoting a podcast episode with a short captioned clip
- Sharing interview or voice-note highlights on social media
- Making an audio-only show watchable with captions
Not a good fit
- Recordings longer than 10 minutes or larger than 100 MB
- Full-episode video editing, multicam or host footage
- Timeline editing, multitrack mixing or team collaboration
Limits and privacy
Up to 100 MB and 10 minutes per upload; cover image up to 5 MB. Free without sign-up or payment; shared queue and hourly usage limits apply. Results expire after 24 hours.
What to check before sharing
Speech recognition can mishear names and overlapping speakers, and captions are not labeled by speaker. Spectrum bars react to audio frequencies; they are not a waveform of the voice. The tool does not edit multitrack recordings, add footage of the hosts, or schedule and publish posts.
Common questions
What is an audiogram?
A short video made from an audio clip, usually with a background image, animated sound bars and captions, so audio can be shared on platforms that play video.
Can I upload a full episode?
Only up to 10 minutes and 100 MB. Trim a highlight first; longer episodes need to be cut into shorter clips.
Can I show my podcast cover art?
Yes. Upload a JPG, PNG or WebP image up to 5 MB as the background and check how it is cropped in the chosen aspect ratio.
Does it identify different speakers?
No. Captions are not labeled by speaker. Correct names and wording in the caption editor before downloading.
Is there a watermark?
No. The exported MP4 contains only your audio, background, title, captions and spectrum; no site logo is added.
Compare free audio to video tools ↗
Product facts
AI Free Audio to Video · audiosubvideo.com
- Price and account
- Free to use without payment or sign-up; shared queue and hourly usage limits apply.
- Speech and image recognition
- Whisper small for speech and Tesseract for images on the production server. No speaker identification, transcript translation or vocal separation.
- Downloads
- MP4 for videos; TXT, JSON and SRT for timed transcripts; TXT and JSON for image OCR.
- Who can access results
- The originating browser session and signed-in site administrators. Uploaded content is not a public case study.
- Audio and video limits
- 100 MB · 10 min
- Completed file retention
- 24 hours