01
Choose your video
Drop an MP4, MOV, WebM, MKV, AVI, M4V, or MPEG file. We check the file locally before conversion.
Local conversion workspace
Convert video to audio
Your video stays on this device. Processing starts only after you click Convert.
0 bytes uploaded
0 bytes uploadedMulti-thread mode is used only when this browser supports SharedArrayBuffer and cross-origin isolation.
Three steps, no upload
How to convert video to audio
A focused workflow that keeps the file, the processing, and the result on your device.
02
Pick format and trim
Use MP3 for sharing, WAV for editing, M4A for efficient playback, or Original to avoid re-encoding.
03
Convert and download
ffmpeg.wasm extracts the audio in a worker. Download the result, then temporary processing memory is released.
Choose with confidence
MP3, WAV, M4A, or original audio?
The best format depends on what happens after the download. This table makes the trade-off explicit.
FormatBest forWhat happens to qualityTypical size
Format
MP3
Best for
Sharing, music players, presentations
What happens to quality
Lossy re-encode at your chosen bitrate
Typical sizeSmall
Format
WAV
Best for
Editing, transcription, archives
What happens to quality
Uncompressed PCM output; it cannot restore detail already lost in the source
Typical sizeLarge
Format
M4A
Best for
Phones, podcasts, efficient libraries
What happens to quality
AAC re-encode with strong quality per byte
Typical sizeSmall
Format
Original (.mka)
Best for
Fast extraction and later editing
What happens to quality
Audio packets are copied; no generation loss
Typical sizeSame as source audio
Practical rule: choose Original when you want the source audio untouched, WAV before serious editing, MP3 for maximum compatibility, and M4A when file size matters.
Built around the real constraints
A private converter that explains its work
Local, not merely encrypted
The selected video is not uploaded for conversion. WebAssembly processes it inside this browser tab.
Original track extraction
Stream-copy mode skips re-encoding, so it is usually the fastest option and introduces no generation loss.
Device-aware processing
Single-thread mode is the safe default. Compatible isolated browsers can use a faster multi-thread core.
Memory has an exit
Cancel stops the worker. A finished job revokes old download URLs and closes temporary processing memory.
Made for the next step
Turn video sound into something useful
The converter is tuned for common tasks, not an endless list of unexplained switches.
Podcast editing
Extract interview audio to WAV before cleanup, mixing, or mastering.
Meeting notes
Trim a recording and export a compact MP3 or M4A for transcription.
Music and samples
Copy the original track when you need the closest possible source for later work.
Classes and lectures
Remove the picture and keep a smaller audio file for listening on the move.
Implementation notes
What “browser local” means here
Conversion uses ffmpeg.wasm, a WebAssembly port of FFmpeg. The engine runs in a Web Worker so the page stays responsive. When supported, the selected video is mounted read-only through WORKERFS instead of being copied into the worker's memory file system; a memory copy is the compatibility fallback. The result is returned as a browser Blob for download. We do not receive either file. Browser conversion is slower than native desktop FFmpeg and still needs output memory, so the first release limits input to 300 MB, blocks risky output estimates, and handles one file at a time.
Reviewed with automated checks and primary sources
Found a format edge case? Use the Contact page.
Clear answers
Video to audio converter FAQ
Format, quality, privacy, trimming, performance, and compatibility answers without vague promises.
No. Conversion runs in this browser with ffmpeg.wasm. The selected video and converted audio are not sent to our server. Standard hosting or optional analytics may still receive normal page-request data, never the file contents.
The first release accepts MP4, MOV, WebM, MKV, AVI, M4V, MPEG, and MPG. A container can hold unusual codecs, so a valid extension does not guarantee that every file can be decoded by the browser build of FFmpeg.
Choose MP3 for broad compatibility, WAV for editing, M4A for efficient AAC audio, or Original when you want to copy the source audio without re-encoding.
No. WAV avoids another lossy compression step, but it cannot recreate detail already removed by AAC, MP3, Opus, or another source codec. It is useful because editors handle PCM predictably.
It copies the first audio stream into an MKA container with no audio re-encoding. This is usually faster and preserves the encoded source quality, but MKA is less universally supported than MP3 or M4A.
Yes. Set start and end times before conversion. Re-encoded MP3, WAV, and M4A cuts are precise for normal use; Original mode follows source packet boundaries and may differ by a fraction of a second.
WebAssembly runs on your device and is slower than native FFmpeg. Video length, source codec, output format, CPU, memory, and whether multi-thread mode is available all affect speed.
The current limit is 300 MB because browser conversion may hold the input, engine, and output in memory at the same time. Shorter files are more reliable on phones and older devices.
Yes. Cancel terminates the processing worker and releases its temporary file system. You can then choose another file or start again.
It works in current mobile browsers for modest files. Mobile memory limits vary, so long or high-resolution videos may fail even when they are below 300 MB. A desktop browser is safer for large jobs.