Audio File Converter

Convert audio files between 10+ formats including MP3, WAV, FLAC, OGG, AAC, M4A, OPUS, AMR, 3GP, and WebM. Download audio from URLs, convert to platform-optimized formats, and get direct download links. Perfect for voice messages, podcasts, and cross-platform audio compatibility.

What does Audio File Converter do?

The Audio File Converter downloads audio files from public URLs and converts them between popular formats. It supports converting to formats optimized for specific platforms like Telegram (OGG), WhatsApp (AMR/OPUS), Discord (OPUS), Apple (M4A), and modern web browsers (WebM). The Actor processes each audio file individually and provides detailed metadata including duration, file size, and quality settings.

You simply provide an audio file URL, specify the target format and quality, and receive a converted audio file with a direct download link. The Actor handles all the conversion work using FFmpeg, ensuring high-quality output regardless of the source format.

Why use Audio File Converter?

Platform-specific audio optimization

Get audio files formatted specifically for your target platform:

• Telegram voice messages → optimized OGG Vorbis with small file sizes
• WhatsApp voice notes → AMR/OPUS format for modern compatibility
• Discord voice communication → OPUS codec optimized for WebRTC
• Apple ecosystem → M4A format for iTunes and iOS devices
• Web streaming → WebM with HTML5 browser support
• Universal use → MP3 for maximum compatibility everywhere

Simplified workflow

Instead of installing audio conversion software or using command-line tools, simply provide a URL and get your converted file. The Audio File Converter runs on the Apify platform, which means you get:

• No software installation required
• Monitoring and logging of every conversion
• Automatic retries for failed downloads
• API access for programmatic use
• Scheduled runs and automation
• Integration-ready with other Apify tools
• Proxy rotation for accessing blocked URLs

Cost-effective audio processing

With pay-per-event pricing, you only pay for the audio files you convert. Each conversion is charged as one event ($0.01), regardless of file size or duration. This makes it cost-effective for both single conversions and batch processing via automation.

Try for free on Apify Store

How to convert audio files

Quick start (3 steps)

1. Provide your audio file URL and select target format
2. Choose quality level (low, medium, high, or lossless)
3. Start the Actor and download your converted file

That's it! The Audio File Converter handles downloading, conversion, and storage automatically.

Step-by-step tutorial

1. Provide audio URL: Enter a direct link to your audio file (MP3, WAV, FLAC, M4A, AAC, etc.)

2. Select target format: Choose from 10 output formats:

   • MP3, WAV, FLAC, OGG, AAC, M4A, OPUS, AMR, 3GP, WebM

3. Choose quality level:

   • Low (128 kbps) - fastest, smallest files
   • Medium (192 kbps) - balanced quality/size
   • High (256 kbps) - excellent quality
   • Lossless - original quality

4. Optional sample rate: Override default (8,000 - 192,000 Hz)

5. Start conversion: The Actor downloads, converts, and stores your file

6. Download result: Get direct download URL from the Output tab

Advanced options

• Custom sample rates: Specific formats benefit from particular sample rates (48kHz for OPUS, 44.1kHz for general audio, 16kHz for voice)
• Quality trade-offs: Higher quality = larger file sizes, longer processing time
• Format-specific optimizations: Each format uses optimized codecs and settings for its target platform

How much does audio conversion cost?

The Audio File Converter uses pay-per-event pricing. You're charged $0.01 per converted audio file, regardless of file size or duration.

Pricing breakdown

Event	Price	When charged
Audio conversion	$0.01	For each audio file processed (success or failure)
Actor start	$0.00005	Covers initialization (free 5 seconds from Apify)

What's included?

• Download from public URLs (no platform usage fees)
• Audio conversion processing
• File storage for 7 days
• Conversion metadata and quality information
• Direct download links
• Error handling and retries

Free usage

• Check the Free plan to see available monthly credit
• Use the prefilled sample URL to test for free
• Only successful conversions consume credits

View full pricing details

Input

The Audio File Converter accepts a JSON object with the following fields. Click on the Input tab for more options and see the prefilled example.

Required fields

Field	Type	Description	Example
file_url	string	Direct URL to audio file	https://example.com/audio.mp3

Optional fields

Field	Type	Description	Default
target_format	string	Output format	mp3
quality	string	Quality level (low/medium/high/lossless)	medium
sample_rate	integer	Sample rate in Hz (8000-192000)	44100

Supported audio formats

Input: MP3, WAV, FLAC, M4A, AAC, OGG, OPUS, and most common audio formats

Output: MP3, WAV, FLAC, OGG, AAC, M4A, OPUS, AMR, 3GP, WebM

Output

You can download the dataset extracted by Audio File Converter in various formats such as JSON, CSV, or Excel from the Storage tab.

Output example

{
  "success": true,
  "original_filename": "audio.mp3",
  "output_filename": "audio.opus",
  "input_format": "mp3",
  "output_format": "opus",
  "file_size_mb": 0.45,
  "conversion_duration_seconds": 3.2,
  "download_url": "https://api.apify.com/v2/key-value-stores/...",
  "timestamp": "2024-02-21T12:00:00Z",
  "quality_settings": {
    "quality_level": "high",
    "bitrate": "256k",
    "sample_rate": 48000,
    "channels": 2
  },
  "platform_info": {
    "primary_use": "Discord voice communication",
    "platforms": "Discord, WebRTC, modern browsers",
    "optimization": "Real-time voice/music"
  },
  "input_duration_seconds": 3.5,
  "input_channels": 2,
  "input_sample_rate": 44100
}

Output fields

Each conversion produces one dataset item containing:

• File information: Original and converted filenames, formats
• Conversion details: Duration, file size in MB
• Download URL: Direct link to download the converted file
• Quality settings: Bitrate, sample rate, channels used
• Platform information: Optimization details for target format
• Input metadata: Duration, channels, sample rate of source file
• Timestamp: When conversion was completed

Error messages are included in the dataset if conversion fails.

Tips and advanced options

Optimize for your use case

Voice messages (Telegram, WhatsApp):

• Use quality: "low" for small file sizes
• Target opus or amr format
• Sample rate: 8000 or 16000 Hz

High-quality audio (music, podcasts):

• Use quality: "high" or lossless
• Target mp3, flac, or wav format
• Sample rate: 44100 or 48000 Hz

Web streaming:

• Use quality: "medium" for balance
• Target webm format
• Sample rate: 48000 Hz

Limit Compute Unit usage

• Use "low" quality for faster conversions and lower costs
• Skip conversion if file is already in target format
• Process shorter files individually instead of large batches

Improve performance

• Use direct URLs (no redirects) for faster downloads
• Avoid very large files (over 500 MB) as they may timeout
• Test with small sample files before processing large batches

FAQ

Is it legal to convert audio files?

The Audio File Converter does not download or modify copyrighted content without authorization. Users are responsible for ensuring they have the right to convert and use the audio files they provide. The Actor simply processes files that users make accessible via public URLs.

What audio file size limit is supported?

The maximum download size is 500 MB per file. Larger files may exceed the run time limit (1 hour) and fail to complete.

Can I convert multiple files in one run?

Currently, the Audio File Converter processes one file per run. For batch processing, use automation to run the Actor multiple times with different URLs, or integrate with other Apify tools for batch operations.

Does the Actor work with streaming services?

No, the Actor requires direct download URLs for audio files. Streaming URLs (YouTube, Spotify, etc.) are not supported. Use a tool that can extract direct audio links first.

What happens if conversion fails?

If conversion fails, an error item is still added to the dataset with the error message. You're still charged because the work (download attempt, validation) was performed. Common failures include invalid URLs, corrupted files, or unsupported formats.

How long are converted files stored?

Converted files are retained in key-value storage for 7 days after the run completes. Download your files promptly to avoid losing access.

Can I use this programmatically?

Yes! The Audio File Converter provides a REST API and SDK clients for Python, JavaScript, and other languages. See the API documentation for details.

Related Actors

Looking for other media processing tools? Explore:

• Video Converter Actor - Convert videos between formats
• Image Processor Actor - Resize and optimize images
• Media Downloader Bundle - Download and convert media in one workflow

(Will be linked to actual Actors when published)

Support

Common issues

"Download failed" error - Verify the URL is publicly accessible. Try opening the link in your browser first.

"Not a valid audio file" - The URL points to a non-audio file or corrupted file. Check the file type.

"Conversion timeout" - File is too large or processing took longer than 1 hour. Try splitting the file or using lower quality.

"Format not supported" - Check that the target format is in the supported list. This Actor doesn't handle video-to-audio extraction.

Get help

• Documentation: Apify Documentation
• Community: Apify Discord
• Issues: Report bugs on the Actor's issue tracker
• Custom solutions: Contact for tailored audio processing workflows

Is audio conversion legal?

This Actor converts audio files but does not bypass any DRM or copyright protection. Users are responsible for ensuring they have the legal right to convert and use the audio content. The Actor processes files provided by the user via public URLs and does not store or redistribute the content beyond the 7-day retention period for download purposes only. For more information on web scraping legality, see our blog post on the legality of web scraping.

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