Free · No Upload · Instant

Convert OPUS to FLAC Free Online — Best OPUS to FLAC Converter 2025

Convert OPUS to FLAC online for free. Fast, private Opus Audio to Free Lossless Audio Codec converter — no upload, no signup. Works in your browser instantly.

Choose Files

or drag and drop files here

Max file size: 2GB

Your files are processed locally in your browser. Nothing is uploaded to any server.

How to Convert OPUS to FLAC

Upload your OPUS file by clicking "Choose Files" or drag and drop it.

Select FLAC as the output format.

Click "Convert Now" and download your converted file.

About OPUS Format

Extension: .opus
Full name: Opus Audio

About FLAC Format

Extension: .flac
Full name: Free Lossless Audio Codec

Frequently Asked Questions

Is it safe to convert OPUS to FLAC online?

Yes! Convert999 processes all files directly in your browser. Your files are never uploaded to any server, ensuring complete privacy and security.

How long does it take to convert OPUS to FLAC?

Conversion is nearly instant for most files. Large files may take a few seconds depending on your device's processing power.

Is there a file size limit?

Convert999 supports files up to 2GB. Processing happens locally, so larger files depend on your device's available memory.

Do I need to install any software?

No installation required. Convert999 works entirely in your web browser on any device.

Can I convert OPUS to FLAC on my phone?

Yes! Convert999 works on any device with a web browser — iPhone, Android, iPad, or desktop. No app installation required. Simply open the converter, upload your OPUS file, and download the converted FLAC file.

Will I lose quality converting OPUS to FLAC?

Convert999 uses high-quality conversion algorithms to minimize quality loss. For lossless formats, the conversion is exact. For lossy formats like images and audio, we use optimized settings that balance quality and file size.

Can I batch convert multiple OPUS files to FLAC?

Yes, Convert999 supports batch conversion. Select or drag & drop multiple OPUS files and convert them all to FLAC format at once. Each file is processed locally in your browser.

What is the difference between OPUS and FLAC?

Opus Audio (OPUS) and Free Lossless Audio Codec (FLAC) differ in compression, compatibility, and features. OPUS is optimized for its native use cases, while FLAC may offer different advantages. Visit our OPUS vs FLAC comparison page for a detailed breakdown.

Why Convert OPUS to FLAC?

Advantages

✓Free Lossless Audio Codec offers better compatibility with modern applications and workflows
✓Converting is completely free with no file size limits on Convert999
✓Your files never leave your device — 100% private and secure conversion
✓Instant conversion without waiting for server processing

Key Differences

→OPUS (Opus Audio) is optimized for its native use cases
→FLAC (Free Lossless Audio Codec) may offer different compression or feature set
→Choose based on your target platform, quality needs, and file size requirements

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