Local browser rendering. No audio or image upload.

Audio to Video

Turn an MP3 or recording into a video with a static cover image and animated waveform. Useful for voice demos, podcast clips, narration, and short-form publishing.

Mode：Local Visual：Cover + waveform Output：MP4/WebM

Video Generation Workspace

Upload audio, set the background, preview the canvas, then render in the browser.

Checking output...

Audio file

MP3/WAV/M4A
Click or drop an audio file here Supports browser-decodable MP3, WAV, M4A, OGG, and similar formats.
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Ready

Background

Cover or colors
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Ready

Video settings

WebCodecs MP4

Preview

1280x720

Audio duration

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Output format

--

Status

Waiting

Download video
Output note: The page uses WebCodecs hardware encoding for H.264/AAC and lazily loads a lightweight MP4 muxer. It does not load ffmpeg.wasm. Audio and images are not uploaded.

When should you turn audio or MP3 into MP4 video?

  • Publish podcasts, audiobooks, music, or narration to YouTube, TikTok, Bilibili, and other video platforms.
  • Create static-cover videos for voiceovers, readings, course narration, and demo reels.
  • Archive course recordings, meeting audio, or knowledge-sharing sessions as video files.
  • Turn audio-only clips into short-form videos for social publishing.

Why is this useful for TTS users?

After generating an MP3 in VoiceIndex AI, users can drop it here, add a brand image, avatar, or course cover, and create an upload-ready video without opening an editor.

How it works

Upload audio, choose a background and resolution, preview the canvas, then generate an MP4 file locally in the browser.

Full MP3 to MP4 Waveform Video Guide

Learn how to combine an image and audio, choose waveform video resolutions, and why WebCodecs is lighter than loading ffmpeg.wasm.

Read the audio to video guide

Create a publishable video in three steps

  1. 01Click or drag an audio file into the upload area.
  2. 02Choose a solid color, gradient, or uploaded cover image, then set resolution, frame rate, quality, and waveform style.
  3. 03Preview the canvas, start generation, and download the finished MP4 video.

How is MP4 generated?

The page encodes H.264 video and AAC audio with WebCodecs, then packages the tracks with a lightweight MP4 muxer. This avoids loading 20MB-scale ffmpeg.wasm.

Will the converted video be large?

File size mainly depends on audio length, resolution, frame rate, and quality. Since the visual layer is a static cover plus waveform, lower resolution or smaller quality settings can keep the file compact.

Which audio formats are supported?

The tool supports common formats that your browser can decode, such as MP3, WAV, M4A, and OGG. Format support can vary between browsers.

Can I use my own photo as the background?

Yes. Switch the background option to upload a cover image, then choose a local image. Both cover-crop and contain modes are supported.

Are files uploaded to a server?

No. Audio decoding, canvas drawing, and MP4 generation happen locally in the browser.