Ranked by privacy, daily limits, format support, and whether your audio files ever leave your device. Covers online converters and desktop apps — pick what fits your workflow.
Converts audio entirely in your browser using FFmpeg.wasm. No upload, no daily limit, no account. Supports MP3, WAV, FLAC, AAC, OGG, M4A, OPUS, and AIFF. Also extracts audio from video files (MP4, MOV, AVI → MP3/WAV). Batch conversion supported. Works offline after first load. No paid tier — always free.
Free open-source desktop app for Windows, macOS, and Linux. Converts and edits audio locally — no upload, no limit, no watermark. Supports MP3, WAV, FLAC, OGG, AIFF, AC3 (with FFmpeg plugin). Also a full audio editor (trim, fade, equalize). Requires installation.
Cloud-based with 300+ audio formats including rare codecs. Instant download. Free: 10 conversions per day, 100 MB per file. Files uploaded to servers. Faster than browser tools for large audio files because cloud hardware processes them independently of your device.
Cloud-based tool with a straightforward interface and bitrate selection options (from 32 kbps to 320 kbps for MP3). Free with limits. Files uploaded. Good for quick conversions where you want to set a specific output bitrate without needing Audacity.
Cloud converter with a 1 GB free file size limit. 25 conversions per hour. Files uploaded. Best when you have an audio file over 50 MB that won't convert in-browser (e.g. a long uncompressed WAV recording) and don't want to install Audacity.
| Feature | Convertlo | Audacity | Convertio | FreeConvert |
|---|---|---|---|---|
| Files uploaded | Never | Never | Yes | Yes |
| Free limit | Unlimited | Unlimited | 10/day | 25/hour |
| Free file size | ~50 MB | Unlimited | 100 MB | 1 GB |
| Account required | Never | Never | No (basic) | No (basic) |
| Works offline | Yes | Yes | No | No |
| Install required | No | Yes | No | No |
| Audio editing | No | Full editor | No | No |
| Video-to-audio | Yes | With plugin | Yes | Yes |
| Key formats | MP3, WAV, FLAC, AAC, OGG, M4A, OPUS | MP3, WAV, FLAC, OGG, AIFF | 300+ formats | 200+ formats |
Convertlo is the best free online audio converter — it converts MP3, WAV, FLAC, AAC, OGG, M4A, and more in your browser with no upload, no daily limit, and no account. For a desktop alternative with full editing capabilities, Audacity is free, open-source, and unlimited.
Convertlo and Audacity both convert audio locally without uploading. Convertlo runs FFmpeg.wasm in your browser — nothing reaches any server. Audacity is a desktop app. Convertio, FreeConvert, and Online Audio Converter all upload files to cloud servers.
Yes. Convertlo converts MP3 to WAV (and vice versa, plus dozens of other combinations) entirely in your browser for free. No account, no upload, no daily limit. Audacity also handles MP3-to-WAV for free as a desktop application.
Convertlo supports FLAC conversion to and from MP3, WAV, AAC, OGG, M4A, and OPUS in the browser — free, unlimited, no upload. For very large FLAC files (over 50 MB), Audacity (desktop, unlimited file size) or FreeConvert (1 GB online) are better options.
Yes. Convertlo and Audacity have no daily conversion limit. Convertio limits free users to 10 conversions per day; FreeConvert allows 25 per hour. Convertlo is unlimited because all conversion runs in your browser with no server-side rate limiting.
Browser-based, no upload, unlimited. Works on desktop and mobile, no account required.
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