Convert to MP3 Free
Local conversion in your browser. Your files never leave your device.
Your files never leave your device. 100% local conversion in your browser. No queues, no hidden limits.
All processing happens in your browser
Select a file
Or drag and drop here
Supported formats: MP4, WEBM, MOV, M4A, OGG, WAV
Limits: 100 MB, 30 minutes
100% Private: Your Files Never Leave Your Device
Unlike most online converters that upload your files to external servers (with risk of leaks), our tool works 100% in your browser using WebAssembly. Your voice recordings, music demos, or confidential audio remain on YOUR device.
We don't store, process, or access your files on any external server. All processing happens locally, guaranteeing your absolute privacy.
Verify Privacy Yourself (30 seconds)
- 1Open Developer Tools: Press F12 (or right-click → Inspect)
- 2Go to Network tab: Click "Network" at the top
- 3Convert a file: Select and convert any audio file
- 4Watch Network tab: You'll see ZERO file uploads during conversion
Your Files Never Leave Your Phone
Convert a file and check your mobile data usage - you'll see 0 MB uploaded. Everything happens on your device.
Try converting nowWhy PrivAudio vs Other Converters
Most converters upload your files to their servers—risky for confidential audio, voice notes, or private recordings. Here's how we're different:
File Processing
100% in your browser
Uploads to their servers
File Storage
Never stored anywhere
Stored 24h (typical)
Processing Speed
Fast browser-based conversion
Upload + Queue + Download
Network Upload
0 bytes of your file uploaded
Uploads entire file
| Feature | PrivAudio | Other Converters |
|---|---|---|
| File Processing | 100% in your browser | Uploads to their servers |
| File Storage | Never stored anywhere | Stored 24h (typical) |
| Processing Speed | Fast browser-based conversion | Upload + Queue + Download |
| Network Upload | 0 bytes of your file uploaded | Uploads entire file |
See the Difference Yourself
Convert a file and experience fast browser-based conversion with zero uploads
Try Converting NowComparison based on publicly available information as of January 2025. Convertio Privacy Policy
How to Convert to MP3
Select your file
Choose the audio or video file you want to convert
Convert
File is processed in seconds in your browser
Download your MP3
Download your converted audio
Use Cases
Convert WhatsApp voice notes (M4A) to MP3 to edit in Audacity or share outside WhatsApp
Convert online meeting recordings (MP4, WEBM) to compressed MP3 to send via email without exceeding 25 MB
Extract audio from downloaded YouTube videos (MP4) to create podcasts or listen without screen
Popular Conversions
Audio Format Comparison
MP3
Available- Size:
- Small (1 MB/min at 128 kbps)
- Quality:
- Good (lossy)
- Compatibility:
- Universal (all devices)
- Best for:
- Music, podcasts, WhatsApp (nearly universal compatibility)
M4A (AAC)
Available- Size:
- Small (1 MB/min at 128 kbps)
- Quality:
- Very good (lossy)
- Compatibility:
- High (Apple, modern Android)
- Best for:
- iPhone voice notes, Apple Music files
WAV
Available- Size:
- Large (10 MB/min uncompressed)
- Quality:
- Excellent (lossless)
- Compatibility:
- Universal (all devices)
- Best for:
- Music production, mastering, DJ
OGG/OPUS
Available- Size:
- Small (0.8 MB/min at 128 kbps)
- Quality:
- Very good (lossy)
- Compatibility:
- Modern (browsers, some devices)
- Best for:
- Web streaming, Discord, Telegram
| Format | Status | Size | Quality | Compatibility | Best for |
|---|---|---|---|---|---|
| MP3 | Available | Small (1 MB/min at 128 kbps) | Good (lossy) | Universal (all devices) | Music, podcasts, WhatsApp (nearly universal compatibility) |
| M4A (AAC) | Available | Small (1 MB/min at 128 kbps) | Very good (lossy) | High (Apple, modern Android) | iPhone voice notes, Apple Music files |
| WAV | Available | Large (10 MB/min uncompressed) | Excellent (lossless) | Universal (all devices) | Music production, mastering, DJ |
| OGG/OPUS | Available | Small (0.8 MB/min at 128 kbps) | Very good (lossy) | Modern (browsers, some devices) | Web streaming, Discord, Telegram |
How Much Does Size Reduce?
Real conversion examples to MP3 (128 kbps)
WhatsApp voice note 1 min (M4A)
3-min song (uncompressed WAV)
60-min meeting recording (MP4 video)
Results vary based on original format and audio quality
Faster Than the Competition
No upload wait time
Processing on your device.
100% Private
Your files never leave your device. Verify in Network tab.
No Queue
Start converting immediately - no queues, no upload delays.
Frequently Asked Questions
Is it free to convert files to MP3?
Yes, 100% free with unlimited conversions. No registration, no tricks, no hidden limits.
What formats can I convert to MP3?
We support all popular formats: MP4, WEBM, MOV, M4A, OGG, OPUS and WAV. We convert to 128 kbps MP3, the universal standard compatible with all devices.
Is it safe? Are my files uploaded to a server?
Completely safe. Your file NEVER leaves your browser. We use WebAssembly to process everything locally on your device. Not even we can see your files. Perfect for confidential audio, WhatsApp messages, or private recordings.
How long does conversion take?
Conversion happens in your browser using WebAssembly, which is very fast. First-time visitors will download the converter engine once (takes a few seconds). After that, conversions start immediately. Actual time depends on your file size and device performance.
Is there quality loss?
MP3 uses lossy compression, which reduces file size by removing inaudible frequencies. At 128 kbps, quality is excellent for most uses: casual music, podcasts, voice messages.
What is 128 kbps and why that bitrate?
Bitrate (128 kilobits per second) determines how much data is used per second of audio. 128 kbps offers an optimal balance between quality and file size for general use: generates approximately 1 MB per minute of audio, maintaining quality that's virtually indistinguishable from the original for the average human ear in most listening scenarios.
Are there any limits?
Technical limits only: 100 MB per file and 30 minutes per file (browser processing constraints). No daily conversion limits—convert as many files as you need.
Have more questions? Try converting and we'll guide you through the process!