HEVC to Opus Converter

How to Convert HEVC to Opus Online

1. Upload Your HEVC File: Drag and drop or click "Add Files" to select.hevc,.h265, or.mov/.mp4 recordings carrying an HEVC video track. Batch upload is supported — drop in a whole folder and process them in one pass.
2. Pick a Bitrate Mode: Open File Compression and choose Quality Preset (Highest -> Lowest) for a one-click default, Constant Bitrate (8-384 kbps; default 128 kbps) for a fixed target, Variable Bitrate (6-510 kbps) to let Opus allocate bits where they matter, Custom Bitrate to type any value in bps/Kbps/Mbps, or Specific file size to hit an exact MB cap (default 8 MB).
3. Adjust Audio Channel and Sample Rate (Optional): Audio Channel keeps the original layout, downmixes to Mono (smallest, ideal for voice), or forces Stereo. Audio Sample Rate keeps the source rate or resamples to 8000 / 12000 / 16000 / 24000 / 44100 / 48000 Hz — Opus internally runs at 48 kHz, so 48000 Hz avoids any extra resample.
4. Trim and Convert: Use Trim to set a start time and duration (seconds, or HH:MM:SS.sss) to extract a single segment instead of the whole video, then click Convert. Files are uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours — no sign-up, no watermark, never shared.

Why Convert HEVC to Opus?

HEVC (H.265, ISO/IEC 23008-2) is the video codec your phone almost certainly uses for 4K capture: every iPhone since the iPhone 7 records "High Efficiency" footage as HEVC inside a.mov or.mp4 wrapper, and Samsung, Google Pixel, and most modern action cams default to HEVC for 4K and high-frame-rate clips. The audio track riding inside is almost always AAC (or AC-3 on some camcorders). Re-encoding that track to Opus — defined in IETF RFC 6716 and shipped natively by Chrome, Firefox, Edge, and Safari 18.4+ — gives you the smallest, highest-quality voice/music file the open web has, without keeping the giant video payload.

• Podcast and interview rips from phone video — A 30-minute 4K HEVC clip is often 6-10 GB, but the audio you actually want is a few megabytes once it is Opus at 64-96 kbps. Stereo speech sounds clear at 32 kbps; mono speech at 16 kbps is still intelligible — territory MP3 and AAC simply cannot reach.
• Discord, Telegram, and WhatsApp voice notes — Discord and Telegram natively use Opus inside Ogg, so an Opus upload skips a re-encode and keeps the original quality. Mono Opus at 24-48 kbps fits comfortably under Discord's 10 MB free attachment cap for clips well past an hour.
• Web audio embeds and HTML5 <audio> — Opus in WebM or Ogg plays in Chrome, Firefox, Edge, and Safari 18.4+ on macOS Sequoia 15.4 / iOS 18.4 and later. Pages load faster than with MP3 because Opus typically delivers the same perceived quality at roughly half the bitrate.
• YouTube and streaming uploads — YouTube transcodes uploaded audio to Opus internally for the WebM stream that DASH delivers to most browsers. Sending Opus directly avoids the AAC -> Opus pivot and any artifacts that come with it.
• Archiving lectures, sermons, and meetings — A 90-minute lecture stored as HEVC video plus audio is multi-GB; the same audio at Opus 32 kbps mono is about 22 MB. Long-form speech is exactly what Opus's SILK speech mode was tuned for.
• VoIP, game-engine, and embedded use — Opus is the default codec for WebRTC, Zoom's web client, and most modern game engines. Extracting Opus from gameplay HEVC captures keeps audio in the same codec the engine expects.

HEVC vs Opus — What You Are Actually Converting

Bitrate Guide for Opus Output

Frequently Asked Questions

Does this discard the video, or can I keep it?

This converter is audio-only — the HEVC video track is dropped and only the audio stream is transcoded to Opus. If you want to keep the video, convert to a video container instead (see HEVC to MP4). To keep audio in a more universal format, see HEVC to MP3 or HEVC to AAC.

What bitrate should I pick for a podcast or interview?

For mono speech, 24-32 kbps is plenty — Opus's SILK mode keeps voice intelligible down to 16 kbps. For stereo speech with light background music, 48-64 kbps sounds clean. Going above 96 kbps for spoken-word content mainly wastes space; Opus at 64 kbps already beats MP3 at 128 kbps for most listeners. Pick Variable Bitrate so quiet passages spend fewer bits.

Why does Opus sound better than MP3 or AAC at low bitrates?

Opus uses a hybrid of two codecs: SILK (derived from Skype's speech codec) for low-bitrate voice and CELT (a transform codec) for music, with the encoder switching between them per frame. Listening tests run by Xiph and the Opus working group showed Opus at 64 kbps stereo outperforming HE-AAC and Vorbis on 48 kHz music, and Opus at 96 kbps beating an LC-AAC encoder and a 136 kbps MP3 on the same material. MP3, designed in 1993, was never tuned for sub-64 kbps work.

Will Opus play on iPhone, iPad, or Safari?

Yes, with caveats. Safari 18.4 (macOS Sequoia 15.4 / iOS 18.4, March 2025) added native playback for Opus in Ogg containers. Earlier Safari versions can play Opus inside WebM or MP4 in some cases but not Ogg. If you need to support older Apple devices, convert to AAC instead — see HEVC to AAC.

Can I extract just a single segment of the audio?

Yes — use the Trim controls. Enter a start time and a duration (in seconds, or HH:MM:SS.sss like 00:01:30.500). The converter decodes only the selected window before encoding, so trimming a 5-minute clip from a 1-hour HEVC file is also faster than processing the whole thing.

What is the file size limit?

There is no fixed cap. Conversion runs on our servers, so the practical limit is upload size and connection speed and your patience for the upload. Multi-GB 4K HEVC files from iPhone, GoPro, or DJI cameras work; on low-RAM devices, trim first or convert one file at a time.

Will downmixing to mono actually reduce file size?

Yes — at the same bitrate, mono Opus carries one channel of audio instead of two, so perceptual quality per kilobit is much higher (or you can drop the bitrate by 30-50% for the same quality). For voice content, mono at 24 kbps usually sounds better than stereo at 32 kbps. For music, stick with stereo unless the source is already mono.

My HEVC file's audio is AAC — does that affect the conversion?

Not in any way you will hear. The converter decodes the source audio (AAC, AC-3, or any other track inside the HEVC container) to PCM, then re-encodes it to Opus at your chosen settings. Going from one lossy codec to another is "tandem encoding" and does add a small amount of artifact, but at sensible Opus bitrates (>=64 kbps stereo) the result is indistinguishable from the source for almost all listeners.

Can I batch-convert many HEVC files at once?

Yes. Drop multiple files (or a whole folder) and apply the same settings to all, or set per-file options before clicking Convert. Each file processes on our servers and downloads individually or as a single ZIP. To shrink an existing Opus file further, see Compress Opus; to convert Opus output to MP3 for legacy players, see Opus to MP3.