Y4M to PCM Converter
Processing entirely on your device — large files may take a moment.
Convert any audio to raw PCM for DSP pipelines, or wrap a PCM dump into WAV/MP3 to make it playable. If your files are still in Y4M format, this page is the shortcut: Y4M is uncompressed video with a text header — the interchange format of video-filter pipelines (avisynth/vapoursynth) and encoder test suites.
This converter runs entirely in your browser using WebAssembly — your files never leave your device, nothing is uploaded, and there are no watermarks, sign-ups or queues. Drop in several files at once to convert them as a batch.
How to convert Y4M to PCM
- 1
Select your files
Select your Y4M video.
- 2
Convert instantly
The engine demuxes the container and encodes the audio track into your chosen format.
- 3
Download results
Download the PCM audio — the video track is simply dropped.
About the Y4M format
Y4M (YUV4MPEG2) is uncompressed video with a one-line text header: resolution, framerate and color space, then raw YUV frames. It is the lingua franca of video-filter pipelines — AviSynth, Vapoursynth and encoder test suites pass frames around as Y4M because there is nothing to misparse.
A Y4M of any real length is enormous (30MB per second of 1080p), so conversion to MP4/WEBM with H.264 or VP9 is always the destination — the value is in the zero-ambiguity input, not the format itself.
+Strengths
- ✓Zero-ambiguity pixel format declaration
- ✓Standard between filter frameworks
- ✓Lossless by construction
!Limitations
- −No compression whatsoever
- −Color space variants (limited/full) trip decoders
- −Not natively playable in browsers
About the PCM format
Raw PCM is audio at its most naked: 16-bit little-endian samples, no header, no metadata, no sample-rate label — just the waveform bytes. It is the lowest common denominator every DSP pipeline, telephony stack and embedded system speaks, which is why exports and lab tools keep asking for it.
Because the file carries no sample-rate information, consumers must agree on the rate out of band (8000 Hz telephony and 48000 Hz video are the common conventions). Wrapping PCM into WAV adds the missing header and makes the bytes playable anywhere.
+Strengths
- ✓Zero overhead — pure sample data
- ✓Universally understood by DSP tools
- ✓Bit-exact lossless representation
!Limitations
- −No header: sample rate must be known out of band
- −Unplayable directly in most apps
Why convert Y4M to PCM?
Converting makes sense where the strengths of PCM meet what Y4M cannot give you. Zero overhead — pure sample data Meanwhile No compression whatsoever One pass through the converter above puts your file on the right side of that trade-off.
Frequently asked questions
Is this Y4M to PCM converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for Y4M to PCM?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
Does converting Y4M to PCM re-encode my video?
Yes. The video is decoded and re-encoded with the settings chosen by the quality slider, which is what allows the format and size to change. For an archival copy, keep higher quality; for sharing, lower quality gives a much smaller file.
Will the audio track be kept?
Yes. The audio is carried over and re-encoded to the standard audio codec of PCM, staying in sync with the video. If your Y4M file has multiple audio tracks, the first one is used.