Choose a recording.
It is decoded at 48 kHz on your device, and more than two channels are folded to stereo.
SOLIPSIUM Super resolution audio engine
Free video tool
Turn an MP3 and one picture into an MP4 video.
Choose a recording and a still picture, and your browser writes an MP4 that shows the picture for as long as the sound lasts. The picture is fitted to 1280 x 720 or 1920 x 1080.
Drop the recording here
It is opened in your browser and not uploaded.
MP3, M4A, WAV, FLAC or another recording your browser opens, up to 30 minutes and 200 MB.
Then drop the picture
A JPEG, PNG or WebP photo or drawing, fitted to the frame you choose.
Make the video
Size
Fit
Whole picture shows all of it, with the background colour where its shape differs from the frame. Fill the frame cuts off the edges that spill over.
Making the video.
Your video
How it works
From a recording and a picture to a video.
The picture is drawn once on a canvas in your browser, and your browser's own video encoder turns that canvas into frames.
Choose a picture.
The page draws it at the size you choose and shows the frame before you make the video, so you can change the fit or the background colour first.
The video is written.
One frame a second shows the picture until the sound ends. The picture is encoded as H.264, or VP9 where the browser has no H.264 encoder. The sound is encoded as AAC at 192 kbps, or Opus where there is no AAC encoder.
Questions
Before you make a video.
Will an upload form take it?
This page makes H.264 video with AAC sound in an MP4 wherever the browser has both encoders. Check the form's own rules for format, length and size.
How large will the video be?
The sound takes about 1.4 MB a minute at 192 kbps. The picture adds a full frame every 10 seconds, and the frames between only repeat it. The page shows the size once the video is made.
Which pictures work?
Any picture your browser opens. JPEG, PNG and WebP open in every current browser.
Can the picture be a waveform?
Yes. Sound wave art draws a recording's waveform and saves it as a PNG, which you can then choose here.
Why does it say Opus or VP9?
The page uses them when this browser has no AAC or H.264 encoder, and says so under the finished video. Some players and upload forms refuse Opus or VP9 in an MP4, so a browser with both encoders is the safer choice for an upload.
Is anything uploaded?
No. Your browser opens the recording and the picture, writes the video and saves it on your device. This page sends nothing from the recording or the picture to Solipsium, not even their names.
Make an old recording easier to hear.
Solipsium works on voicemails, voice memos, answering machine tapes and camcorder audio.
Try it on a recording
The check and the 20-second try need no account.