# Audio Processing

Pull, mix, and tweak audio from any video or audio file. All processing happens locally in your browser.

[🎵ExtractionExtract & convert audio from videoFormat conversion (MP3, AAC, WAV, FLAC, Opus, OGG)Trim segmentsNormalize audio](/audio/extraction)[🎛️EffectsApply audio effects and processingVolume & fadesEQ & dynamicsNoise reductionSpeed & pitch](/audio/effects)[🎚️MixingCombine, replace, and mix audio tracksMix sourcesReplace audioDuckingCrossfade](/audio/mixing)

## How Browser-Based Audio Processing Works

VidStudio processes audio entirely in your browser. When you add a video or audio file, it stays on your device and nothing is sent to a server. You get format conversion, effects, and multi-track mixing without installing anything or signing up. Processing speed depends on your device and the file length. Short clips finish in seconds; a long recording can take a few minutes.

## About Audio Processing

#### Extraction

Extract audio from videos and convert to MP3, AAC, WAV, FLAC, Opus, or OGG Vorbis. Trim specific segments and normalize loudness levels.

#### Effects

Add compression, EQ, noise reduction, and speed/pitch changes. Stack multiple effects for professional results.

#### Mixing

Combine multiple audio sources, replace video audio tracks, create crossfades, and apply ducking for voiceovers.

## Convert Video to Audio

#### [MP4 to MP3](/mp4-to-mp3)

The most common conversion. MP3 plays on every device, media player, and platform.

#### [MOV to MP3](/mov-to-mp3)

iPhone and QuickTime recordings to MP3 for broader playback.

#### [MP4 to AAC (M4A)](/mp4-to-aac)

Better quality than MP3 at the same bitrate. Native to Apple devices.

#### [WAV, FLAC, Opus and OGG](/audio/extraction)

Lossless or open formats for editing, archiving, and speech. All six outputs live on the extraction tool.

## Common Use Cases

#### Extract Podcast Audio

Pull the audio track from video recordings of podcast sessions and export as MP3 or AAC for podcast distribution platforms.

#### Add Background Music

Mix background music into your video at the right volume level using the ducking feature to keep dialogue clear.

#### Remove Background Noise

Apply noise reduction and EQ filters to clean up recordings with unwanted hum, hiss, or ambient sound.

#### Create Social Media Clips

Extract and trim audio segments from longer recordings to create short clips for social media sharing.

Privacy by architecture

## All processing happens locally in your browser, and your files never leave your device.

No upload step, no server queue, no waiting.

Verify in 30 seconds

1. 01`⌘⌥I` Open DevTools and switch to the Network panel.
2. 02 Filter to fetch and XHR requests.
3. 03 Drop your file in and start the tool.
4. 04 You will see the app itself and, on your first visit, the video engine download. Nothing involving your file.

How this works

Video and audio processing runs through FFmpeg compiled to WebAssembly. Hardware decoding goes through the browser's WebCodecs API. Speech recognition runs against a Whisper model that downloads once and caches in your browser, never streamed from a third-party server.

## Related Tools

#### [Trim & Cut](/trim)

Trim clips and remove unwanted sections from your video before extracting or processing the audio track.

#### [Compress Video](/compress)

Reduce file size while preserving audio quality. Useful after mixing a new audio track into your video.

#### [Subtitles & Text](/subtitles)

Add text overlays, burn-in subtitles, or create animated text effects to pair with your audio edits.

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Source: [https://vidstudio.app/audio](https://vidstudio.app/audio)