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FLAC to Opus Converter

Convert FLAC audio to Opus with bitrate, resampling, and channel options

Click to upload file or drag and drop file here

Maximum file size: 80MB Supported formats: audio/flac, audio/x-flac

Select the source audio file

Key Facts

Category
Media
Input Types
file, select, checkbox
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

The FLAC to Opus Converter allows you to efficiently transform high-quality, lossless FLAC audio files into the highly efficient Opus format, perfect for streaming and web applications while maintaining excellent sound fidelity.

When to Use

  • •When you need to reduce file sizes for web streaming without significant loss in audio quality.
  • •When you want to optimize your audio library for compatibility with modern web browsers and mobile apps.
  • •When you need to adjust audio parameters like bitrate, sample rate, or channel configuration for specific playback requirements.

How It Works

  • •Upload your source FLAC file using the file selector.
  • •Select your preferred output settings, including bitrate, sample rate, and channel count.
  • •Toggle the metadata option if you wish to preserve artist and title tags.
  • •Click the convert button to process your file and download the resulting Opus audio.

Use Cases

Preparing high-fidelity music archives for bandwidth-efficient web streaming.
Standardizing audio assets for cross-platform mobile application development.
Reducing storage footprint for large collections of lossless audio files.

Examples

1. Optimizing Podcast Audio for Web

Content Creator
Background
A podcaster has high-quality FLAC recordings that are too large for quick website loading.
Problem
The files need to be compressed to a web-friendly format without sacrificing voice clarity.
How to Use
Upload the FLAC file, set the bitrate to 128 kbps, and ensure the sample rate is set to 48 kHz.
Example Config
bitrate: 128, sampleRate: 48000, channels: auto, keepMetadata: true
Outcome
A compact Opus file that maintains professional audio quality while loading instantly on the website.

2. Downmixing for Mobile Compatibility

App Developer
Background
An app developer needs to include sound effects in a mobile app, but the source files are multi-channel FLACs.
Problem
The mobile audio engine requires simple stereo files to ensure consistent playback across devices.
How to Use
Upload the FLAC file and select 'Stereo (2 channels)' in the channel settings.
Example Config
bitrate: 192, sampleRate: 48000, channels: 2, keepMetadata: false
Outcome
A standardized stereo Opus file ready for integration into the mobile application.

Try with Samples

audio, file
Copyright-Free OPUS Audio Samples
Next-generation OPUS audio samples with superior compression and quality, featuring nature sounds and meditation music optimized for modern streaming
title token opus
audio
Copyright-Free FLAC Audio Samples
Lossless FLAC audio samples for testing and development, mirrored from MP3 set with nature sounds and meditation music
title token flac
audio
Copyright-Free AAC Audio Samples
High-quality AAC encoded audio samples for testing and development, featuring nature sounds and meditation music with excellent compression
preferred input family audio
audio
WebRTC Real-Time Communication Samples
Comprehensive WebRTC samples for peer-to-peer audio/video communication, data channels, screen sharing, and signaling server implementation
preferred input family audio
audio

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FAQ

What is the benefit of converting FLAC to Opus?

Opus is a highly efficient, low-latency audio codec that provides superior sound quality at lower bitrates compared to older formats, making it ideal for web use.

Can I change the audio channels during conversion?

Yes, you can choose to keep the original channel configuration or force the output to Mono or Stereo.

Will I lose my song metadata?

By default, the tool is set to preserve metadata such as artist and title tags, provided they are available in the source file.

What is the maximum file size I can upload?

You can upload FLAC files up to 80 MB in size.

Does this tool support batch conversion?

This tool is designed to process one audio file at a time.

API Documentation

Request Endpoint

POST /en/api/tools/flac-to-opus

Request Parameters

Parameter Name Type Required Description
audioFile file (Upload required) Yes Select the source audio file
bitrate select No -
sampleRate select No -
channels select No -
keepMetadata checkbox No -

File type parameters need to be uploaded first via POST /upload/flac-to-opus to get filePath, then pass filePath to the corresponding file field.

Response Format

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}
File: File

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-flac-to-opus": {
      "name": "flac-to-opus",
      "description": "Convert FLAC audio to Opus with bitrate, resampling, and channel options",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=flac-to-opus",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

Supports URL file links or Base64 encoding for file parameters.

If you encounter any issues, please contact us at [email protected]