Step 1: Submit your MP3 files using the button above or by pull and release.
Step 2: Click the 'Transform' button to start the transformation.
Step 3: Save your converted FLV files.
MP3 to FLV Transformation FAQ
How do I turn a MP3 audio file into a FLV video?
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Upload your MP3 file and the converter wraps the audio into a FLV video container with a generated visual layer (a solid background or the embedded cover art). The audio plays unchanged; you get a FLV file you can upload anywhere that requires video instead of audio.
Why would I convert MP3 to FLV instead of keeping it as audio?
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Most video platforms — YouTube, Instagram, TikTok, Facebook — reject raw audio uploads but accept FLV. Converting MP3 to FLV gives the track a video wrapper so it passes the upload check, while the sound stays exactly as it was in the MP3 source.
What appears on screen in the FLV file?
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By default a static frame: the MP3 file's embedded cover art if present, otherwise a solid background. The frame is held for the full duration of the audio, so the FLV file is a single still image with your MP3 audio as the soundtrack — small and fast to encode.
Will the FLV video lose any audio quality versus the MP3 source?
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No re-sampling beyond what the FLV container's audio codec requires. The MP3 audio is muxed into FLV and, where the container allows the same codec, copied bit-for-bit. Where FLV needs AAC / Opus, we transcode at 192 kbps or higher so the result is transparent.
How long will the FLV video be?
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Exactly as long as the MP3 audio — a 4-minute song becomes a 4-minute FLV video, a 50-minute podcast becomes a 50-minute FLV. The still-image visual costs almost nothing, so duration, not picture, drives the encode time.
How big will the FLV file be compared to the MP3 audio?
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Only slightly larger. Because the picture is a single repeated frame, the video stream adds very little — most of the FLV file size is still the audio. A 5 MB MP3 track typically yields a FLV file in the 6-9 MB range.
Can I use my own image as the background instead of the cover art?
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Not in this one-step converter — it uses the embedded MP3 cover art or a default background. To set a custom still or a looping clip behind the audio, convert MP3 to FLV here first, then use /video-editor/ to swap the visual track.
Will the FLV file play on YouTube and social platforms?
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Yes. We default to the most compatible codec for the FLV container (H.264 for MP4 / MOV, VP9 for WebM, H.265 for MKV) so the FLV upload is accepted and transcoded cleanly by YouTube, Instagram, TikTok and Facebook without a "format not supported" error.
Can I batch-convert a whole album of MP3 files to FLV?
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Yes — drop the full set of MP3 files in and each becomes its own FLV video in parallel. Premium runs more workers, so a 12-track album finishes far faster than converting each MP3 one at a time.
Are my MP3 files private during the FLV conversion?
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Yes — uploaded MP3 files are processed in isolated workers and deleted within minutes. We never listen to, retain, or share your audio. The full retention window is documented at /privacy/.
Does the FLV video keep the MP3 title and artist tags?
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Where the FLV container supports metadata, the MP3 title / artist / album tags are copied into the FLV file. Note that most video platforms read their own title field on upload rather than the embedded tag, so set the platform title manually too.
What's the difference between converting MP3 to FLV and just extracting audio later?
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Converting MP3 to FLV adds a visual layer so the audio can live as a video; the reverse — pulling audio back out of a video — is a separate /video-to-audio/ operation. If you only need the sound in a different audio format, use the audio-to-audio converter instead of going through FLV.