Audio + image video maker
Turn a single 1080p image and a long MP3 into an MP4 locally in your browser. The output is encoded without real-time playback and is streamed to disk when your browser supports it.
JPEG, PNG, or WebP. The image is fitted inside the selected output size.
MP3 is recommended. Audio is decoded and re-encoded as AAC for broad MP4 compatibility.
1 fps is enough for a static image and keeps the file small.
Files stay on this device. Chrome or Edge on desktop is recommended because it supports WebCodecs and the File System Access API. Safari and Firefox may not support this tool yet. The fallback download keeps the encoded file in a Blob, so it is less suitable for very long recordings.
For a 2-hour source, browser audio decoding can still require substantial temporary memory. Close memory-heavy tabs first.