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Need help?FLV to AIFF Converter
This tool extracts the audio track from an FLV (Adobe Flash Video) file and writes it to an AIFF file — the video frames are discarded, and only the sound is kept. It exists to rescue audio out of a Flash-era archive — old webcasts, screen recordings, lecture captures, and downloaded clips from when Flash ran the web — into AIFF, an uncompressed format that DAWs like Logic Pro, Pro Tools, and GarageBand open natively. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically a few hours after conversion — no sign-up, no watermark, never shared or made public.
FLV Format at a Glance
| Property | Value |
|---|---|
| Full name | Flash Video |
| Developer | Macromedia, later Adobe |
| Type | Container (video + audio) |
| Audio codecs carried | MP3, AAC, Nellymoser (Asao), Speex, ADPCM — all lossy or low-rate |
| Platform status | Dead — Adobe ended Flash Player support December 31, 2020, and blocked Flash content January 12, 2021 |
| File extensions | .flv, .f4v |
| Typical sources | Flash-era webcasts, screen captures, downloaded streaming clips |
AIFF Format at a Glance
| Property | Value |
|---|---|
| Full name | Audio Interchange File Format |
| Developer | Apple, introduced 1988 (based on EA's IFF) |
| Payload | Uncompressed linear PCM — lossless |
| Byte order | Big-endian (this tool's default: PCM 16-bit Big Endian) |
| Bit depth options | 16, 24, or 32-bit |
| File extensions | .aif, .aiff (.aif and .aiff are interchangeable) |
| Typical size | ~10 MB per minute at CD quality (44.1 kHz, 16-bit stereo) |
| Best for | Editing in macOS DAWs — Logic Pro, Pro Tools, GarageBand |
A Note on Quality: This Is a Transfer, Not an Upgrade
FLV audio is always stored in a lossy codec (MP3, AAC, Nellymoser, or Speex). Converting that to AIFF gives you a bit-exact PCM copy of what the decoder produces — but it does not restore detail the original lossy encoder threw away. The file gets larger and the sound stays the same. The reason to do it anyway is workflow: an uncompressed AIFF is edit-ready and drops straight into a DAW timeline without re-decoding on every playback, whereas a raw FLV is awkward to import into audio software. If you instead want a small, shareable file, convert to FLV to MP3. If you want to keep the picture too, use FLV to MP4.
How to Convert FLV to AIFF
- Upload Your FLV File: Drag and drop your .flv file onto the page or click "+ Add Files" to select it. You can queue several clips and convert them with the same settings.
- Set Audio Channel and Sample Rate: Both default to "Original," which copies the source layout unchanged. Open Advanced Options to force Mono or Stereo, or to resample to a target like 44100 Hz.
- Choose the PCM Codec (Optional): AIFF output defaults to PCM 16-bit Big Endian (CD quality). Switch to PCM 24-bit or 32-bit in the codec list only if a later stage in your DAW needs the extra headroom.
- Convert and Download: Click "Convert" and download your AIFF file. No sign-up, no watermark.
Frequently Asked Questions
Will converting FLV to AIFF improve the audio quality?
No. FLV stores audio in a lossy codec, so the detail discarded at encode time is already gone. AIFF gives you a lossless, uncompressed copy of the decoded audio — same sound, larger file. The benefit is that AIFF is edit-ready in a DAW, not that it sounds better.
What audio codec does an FLV file actually contain?
Most commonly MP3 or AAC, but older Flash recordings often use Nellymoser (Asao) — a proprietary mono codec built for low-bandwidth voice — or Speex. All of these are lossy. Whatever the source codec, this tool decodes it and re-writes the result as uncompressed PCM inside the AIFF container.
Why convert to AIFF instead of WAV?
Both are uncompressed PCM and sound identical. AIFF is big-endian and is the native uncompressed format on macOS, so it imports cleanly into Logic Pro, GarageBand, and Pro Tools. If you are on Windows or need broad compatibility, FLV to WAV is the better target.
What bit depth and sample rate will the output use?
By default the codec is PCM 16-bit Big Endian and the sample rate is copied from the source ("Original"). In our testing, a typical Flash webcast carrying 44.1 kHz audio came out as a 16-bit/44.1 kHz stereo AIFF of roughly 10 MB per minute. You can raise the bit depth to 24 or 32-bit, but that only pads the file — it cannot add resolution the lossy source never had.
Is .aif different from .aiff?
No. They are the same format; the extension is just truncated to three letters on some systems. A file saved as .aif and one saved as .aiff open identically in audio software.
Can you still play FLV files now that Flash is dead?
Adobe ended Flash Player support on December 31, 2020 and blocked Flash content in January 2021, but FLV is just a container — modern players and converters read it directly without Flash Player installed. Extracting the audio to AIFF is a reliable way to preserve it before the source clips become harder to open.
My FLV uses mono Nellymoser voice audio — will the AIFF be mono too?
By default Audio Channel is set to "Original," so a mono source such as a Nellymoser voice recording stays mono and the AIFF carries a single channel — there is no benefit to forcing it to stereo, since duplicating one channel only adds size, not information. If a later tool insists on a stereo file you can set Audio Channel to Stereo, but both channels will be identical.
How long do you keep my uploaded file?
Your FLV upload and the AIFF result are stored only long enough to process and return the download. Both are deleted automatically a few hours after conversion. Files are sent over an encrypted connection, are never shared or made public, and no sign-up is required.