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Free Audio Converter Online

Convert Audio in Your Browser·freeaudioconverteronline.com

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Free Audio Converter Online is a browser-based tool that converts and compresses audio files (MP3, WAV, AAC, M4A, FLAC, OGG) and some video inputs (MP4, MOV, MKV) without uploading them to a server. Conversion runs locally using FFmpeg compiled to WebAssembly, so files stay on the user's device. It supports batch processing, format presets, advanced export settings (bitrate, sample rate, channels, normalization, fades), and downloading results individually or as a ZIP.

What it's for

Shrinking a WAV file to a smaller formatExporting an MP3 copy of an audio fileChanging audio formats before sharingConverting large WAV or FLAC files into smaller MP3 or AAC copies for email, chat, or uploadKeeping private recordings (interviews, voice notes, client drafts) on-device during conversionConverting voice memos to MP3Preparing podcast drafts with specific bitrate settingsExtracting audio from video files (e.g., MP4 to MP3)Batch converting multiple files at once and downloading as ZIP

Features 16

  • Adjustable bitrate (64–320 kbps)
  • Adjustable sample rate (22.05–96 kHz)
  • Batch file conversion
  • Browser-based audio conversion using FFmpeg compiled to WebAssembly
  • Channel selection (stereo/mono)
  • Compression mode selection (CBR/VBR)
  • Download all converted files as a ZIP
  • Fade-in/fade-out controls
  • In-browser preview before download
  • No file upload required (local/private processing)
  • No install required
  • No signup required
  • Normalization option
  • Quick presets: Default, Speech, Music, Small file, High quality
  • Supports MP3, WAV, AAC, M4A, FLAC, OGG formats
  • Supports video inputs MP4, MOV, MKV for audio extraction

At a glance

free tier
TypeWeb app
DeploymentCloud
PlatformsWeb
LanguagesEnglish
CompanyFree Audio Converter Online Team

Pricing

Described as 'Free for normal use' with 'no signup and no paywall for common audio workflows.' The site states it is supported by ads and analytics cookies to keep the tool free; no paid plans are listed.

FreeFree

No paywall for common audio workflows; site supported by ads and analytics cookies.

Recommended for browser-based workflows up to 100 MB per file; larger batches work best on desktop.

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Last checked 2 months ago·