SnipFree MP3 to MP4 Converter
Turn any audio file (MP3, WAV, FLAC, M4A, OGG, AAC) into an MP4 video — perfect for uploading audio to YouTube, Instagram, or anywhere that needs video. Add your own cover image or use our generated default. 100% in your browser. No upload, no sign-up.
100% in your browser. FFmpeg.wasm encodes locally. Your audio and image files never leave your device. First conversion loads FFmpeg (~25 MB, ~10–20 seconds); after that, every encode is instant. Privacy policy.
Drop an audio file
or click to browse. MP3 is most common.
A dark gradient with the filename and music-note icon. Or upload your own JPG/PNG (square or 16:9 works best for YouTube).
Why convert MP3 to MP4 — common use cases
- Upload a song or podcast to YouTube. YouTube doesn't accept MP3 files directly — only video. Wrap your audio in an MP4 with a still cover image and you can upload it like any other video.
- Share on Instagram, TikTok, X, LinkedIn. Same constraint as YouTube — these platforms require video files for the audio-heavy formats (carousel posts, story audio, etc.).
- Background audio for video editors. Some editors prefer importing audio as MP4 to keep all assets in one container format.
- Quick visual layer for voice memos. Turn a voice note + a screenshot or photo into a shareable MP4 in 10 seconds.
How this tool works (no upload, in your browser)
Behind the scenes, we use FFmpeg.wasm — the full FFmpeg multimedia toolkit compiled to WebAssembly. When you click Convert to MP4, your browser combines the audio track with the still image into a single MP4 file using the H.264 video codec and AAC audio codec. Because FFmpeg runs locally on your machine, your audio and cover image are never uploaded to a server. We literally cannot access what you're converting.
Output specifications
- Container: MP4 (with
+faststartflag for streaming-friendly playback) - Video codec: H.264 (libx264), still-image tune, ultrafast preset for browser speed
- Audio codec: AAC at 192 kbps (near-CD quality, broadly compatible)
- Pixel format: yuv420p — required for YouTube and most platforms
- Resolution: Your choice — 1080p or 720p
- Frame rate: Still image (efficient encoding)
Tips for YouTube uploads
- Pick a square or 16:9 cover image. YouTube's default video aspect ratio is 16:9. A square image will get letterboxed but still works.
- Make the cover image high-resolution. A 1920×1080 (or larger) cover image will look crisp; small images get upscaled and look blurry.
- Add chapters in YouTube Studio. Use timestamps in your description to break up a long audio file.
- Use 1080p output. YouTube treats 1080p as HD; lower resolutions can affect recommendation.