Is the OPUS to FLAC converter free?

Yes. Transcodr is free with no accounts, watermarks, or hard limits beyond your device's available memory.

Are my files uploaded to a server?

No. The conversion runs locally via ffmpeg compiled to WebAssembly, so your OPUS file never leaves the browser tab.

What quality is the FLAC output?

FLAC — lossless — a lossless result, so no audio quality is lost (files are larger).

How do I convert OPUS to FLAC?

Drop your OPUS file above (or click Browse) — the output is already preset to FLAC — then click Convert and download the result.

OPUS → FLAC · On-device · No upload

Convert OPUS to FLAC

Convert OPUS to FLAC in seconds, free and entirely in your browser. Opus is the modern, highly efficient codec used for streaming and voice; FLAC is losslessly compressed audio, ideal for archiving. Transcodr runs real ffmpeg compiled to WebAssembly, so your file is processed on your own device and never uploaded.

Drop files to convert

Video, audio, images, subtitles: anything ffmpeg can read. Drop them anywhere on the page or browse from disk.

Try a sample:

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Time	From		To	Size	Δ	Duration
When you convert something, it’ll appear here. Clears on tab close — we don’t keep records.

OPUS vs FLAC

Property	OPUS	FLAC
Compression	Lossy	Compressed
Fidelity	Best at low bitrate	Lossless
File size	Small	Medium

OPUS → FLAC questions

Is the OPUS to FLAC converter free?: Yes. Transcodr is free with no accounts, watermarks, or hard limits beyond your device's available memory.
Are my files uploaded to a server?: No. The conversion runs locally via ffmpeg compiled to WebAssembly, so your OPUS file never leaves the browser tab.
What quality is the FLAC output?: FLAC — lossless — a lossless result, so no audio quality is lost (files are larger).
How do I convert OPUS to FLAC?: Drop your OPUS file above (or click Browse) — the output is already preset to FLAC — then click Convert and download the result.

01 / Engine

Real ffmpeg, compiled to WebAssembly.

Same library Netflix, YouTube, and basically every command-line video tool relies on, running in a Web Worker. Pipe a file in, run a command, pipe bytes back out.

02 / Privacy

Nothing leaves the tab.

No uploads, no accounts, no telemetry beyond an anonymous pageview. We couldn’t see your files if we wanted to — there’s no server in the loop.

03 / Limits

It is, after all, a tab.

Files up to a few hundred megabytes convert comfortably. Beyond that, your browser starts asking pointed questions. Use the desktop ffmpeg for 4K masters.

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