A free audio to video converter that turns any audio file into an MP4 with your picture, a waveform and captions, in your browser.
Drop a clip of your podcast, and get a video with your words lit as they're said, a moving waveform and your show's name, ready for Instagram, TikTok, LinkedIn and X. It all happens in this browser.
Add your audio
Whisper doesn't tell speakers apart, and it can mishear names, so read the captions before you make the video. The sound stays on your computer unless you pick On our server.
This free audio to video converter turns any audio file into an MP4 video, with a picture or colors behind it, in your browser.
Upload a podcast episode to YouTube, or post a voice note where only video goes, with a waveform, a title and captions if you like. Nothing is uploaded.
Here's how to make one, and which size each platform wants.
What is an audio to video converter?
An audio to video converter makes a video file from a sound file: the sound plays over a picture. Video platforms like YouTube take video files, not MP3s.
This one draws every frame in your browser and saves an MP4 with the sound in AAC.
Which shape
| Shape | Size | Where |
|---|---|---|
| Landscape 16:9 | 1920 x 1080 | YouTube, full episodes |
| Square 1:1 | 1080 x 1080 | Feeds on Instagram, LinkedIn and X |
| Portrait 4:5 | 1080 x 1350 | Instagram and LinkedIn feeds |
| Vertical 9:16 | 1080 x 1920 | Reels, TikTok and Shorts |
Long files
A full episode works: set the start and the end, up to an hour. Every frame is drawn and encoded on your computer, so a long file takes a few minutes, and the tab needs to stay open.
For a short clip with captions, the audiogram generator opens on a square with captions on.
Captions, if you want them
Tick Add captions, and Whisper writes them on your device. Fix any word, pick a look, and they're drawn into the video.
Nothing is uploaded
The audio never leaves your computer: your browser reads it, draws each frame and saves the video.
After you convert
Upload it to YouTube with the episode's title and chapters. The podcast summarizer writes the chapters from the episode's link.
Who is the audio to video converter for?
It's for anyone who wants to post audio where only video plays:
- Audiogram generator – podcasters who want a waveform and captions
- Video resizer – people fitting the video to each platform
- Video caption generator – anyone adding subtitles
- MP4 to MP3 converter – people going back to audio only
The rest of my tools are on the free tools page.
Audio to Video Converter FAQs
Questions about the audio to video converter? Here's what to know.
An audio to video converter makes a video file from a sound file, with a picture behind the sound.
This one saves an MP4 in your browser.
Convert the episode here in the Landscape 16:9 shape, with your cover picture, then upload the MP4.
YouTube takes video files, not MP3s.
Up to an hour a video.
Every frame is drawn on your computer, so a long file takes a few minutes.
Yes, click Use your own picture and pick your cover.
It fills the frame, darkened so the title stays readable.
Yes, it's free, with no account and no watermark.
On your device there's no limit; on our server, each visitor gets 40 minutes a day.
No, not on this device: Whisper and the video maker run in your browser.
On our server, only the sound is sent, in pieces, and it isn't kept.
This audio to video converter is for podcasters and anyone with audio to post where only video goes:
- Video resizer – creators posting one video in several sizes.
- Podcast transcript generator – podcasters who clip their episodes.
- Video to text converter – anyone who needs the words as text too.
Musicians use it to put a track on YouTube with its artwork.
I did.
I'm Navid Moazzez, and the audio to video converter is one of my free tools on navid.me.
Read more about me.
There's a video caption generator, an audiogram generator, an audio to video converter, a video resizer and a video to text converter.
The rest are in free tools.
Navid Moazzez
AI business strategist & AI OS builder
Navid Moazzez helps creators and founders master AI and build their own AI Operating System (AI OS) to automate their business and life.
Navid.me is reader-supported. When you buy through links on this site, I may earn an affiliate commission. Learn more.
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