Step 1: Upload your MP3 files using the button above or by drag and drop.
Step 2: Click the 'Convert' button to start the conversion.
Step 3: Download your converted WebM files.
MP3 to WebM Conversion FAQ
How do I turn a MP3 audio file into a WebM video?
+
PDF.to wraps your MP3 audio into a WebM video with a static cover image (or a generated waveform) as the visual track. Upload the MP3, optionally drop in a cover image, and download the finished WebM.
Why would I convert MP3 audio to a WebM video?
+
A WebM video plays everywhere a raw MP3 sometimes will not — most notably on video-only platforms and social feeds that require a video container. It is the standard way to publish a podcast, song, or mix as a shareable WebM.
What plays in the picture of the WebM?
+
By default PDF.to shows a single still cover image for the full duration. You can upload your own artwork, or let the converter render an animated waveform that moves with the MP3 audio.
Will the audio quality of my MP3 change in the WebM?
+
The MP3 stream is re-encoded into the WebM container at a high audio bitrate (192 kbps AAC by default), so it stays effectively transparent for music and speech. Lossless MP3 sources are not upsampled.
What resolution is the WebM video?
+
The WebM matches the cover image you supply, defaulting to 1280x720. Because the picture is static, a higher resolution adds almost nothing to the file size — the bulk of a WebM made from MP3 is the audio.
Can I set a custom thumbnail or cover for the WebM?
+
Yes. Upload any JPG or PNG and PDF.to centers it on a solid background for the whole WebM. This is how you give a MP3 track a branded video thumbnail.
Does the WebM keep the title and artist tags from my MP3?
+
Where the WebM container supports metadata, title and artist tags from the MP3 are carried over. The cover artwork embedded in the MP3 is also used automatically if you do not supply your own.
Can I batch-convert many MP3 files to WebM?
+
Yes. Drop a folder of MP3 files and each becomes its own WebM video; all of them are zipped for a single download.
Is the MP3 to WebM conversion free?
+
Yes for files under 100 MB. PRO unlocks larger MP3 uploads (up to 5 GB), longer durations, and parallel jobs.
How long can the MP3 be?
+
Full-length albums and multi-hour MP3 recordings convert fine. Because the picture is static, even a long WebM stays modest in size relative to a filmed video of the same length.
Will the WebM play on YouTube, Instagram, and TikTok?
+
Yes. PDF.to encodes the WebM with a widely supported codec and pixel format, so the resulting video uploads cleanly to the major platforms that reject bare MP3 audio.
Are my MP3 files private during conversion?
+
Uploads are encrypted in transit, the conversion runs in an isolated worker, and both the MP3 and the rendered WebM are deleted automatically a short time after you download.