Step 1: Upload your M4R 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 FLV files.
M4R to FLV Conversion FAQ
How do I turn a M4R audio file into a FLV video?
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PDF.to wraps your M4R audio into a FLV video with a static cover image (or a generated waveform) as the visual track. Upload the M4R, optionally drop in a cover image, and download the finished FLV.
Why would I convert M4R audio to a FLV video?
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A FLV video plays everywhere a raw M4R 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 FLV.
What plays in the picture of the FLV?
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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 M4R audio.
Will the audio quality of my M4R change in the FLV?
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The M4R stream is re-encoded into the FLV container at a high audio bitrate (192 kbps AAC by default), so it stays effectively transparent for music and speech. Lossless M4R sources are not upsampled.
What resolution is the FLV video?
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The FLV 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 FLV made from M4R is the audio.
Can I set a custom thumbnail or cover for the FLV?
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Yes. Upload any JPG or PNG and PDF.to centers it on a solid background for the whole FLV. This is how you give a M4R track a branded video thumbnail.
Does the FLV keep the title and artist tags from my M4R?
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Where the FLV container supports metadata, title and artist tags from the M4R are carried over. The cover artwork embedded in the M4R is also used automatically if you do not supply your own.
Can I batch-convert many M4R files to FLV?
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Yes. Drop a folder of M4R files and each becomes its own FLV video; all of them are zipped for a single download.
Is the M4R to FLV conversion free?
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Yes for files under 100 MB. PRO unlocks larger M4R uploads (up to 5 GB), longer durations, and parallel jobs.
How long can the M4R be?
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Full-length albums and multi-hour M4R recordings convert fine. Because the picture is static, even a long FLV stays modest in size relative to a filmed video of the same length.
Will the FLV play on YouTube, Instagram, and TikTok?
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Yes. PDF.to encodes the FLV with a widely supported codec and pixel format, so the resulting video uploads cleanly to the major platforms that reject bare M4R audio.
Are my M4R files private during conversion?
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Uploads are encrypted in transit, the conversion runs in an isolated worker, and both the M4R and the rendered FLV are deleted automatically a short time after you download.