HEVC to FLAC Converter

HEVC to FLAC, or HEVC to Something Lossy — Which Should You Extract To?

If you are pulling the soundtrack off an H.265 clip, the destination format is the real decision, and FLAC is the one people pick for the wrong reason. FLAC is genuinely lossless: it stores the decoded samples bit-for-bit and, since December 2024, is formally specified as RFC 9639. What it cannot do is undo the encoder that came before it. The audio riding alongside HEVC video is nearly always AAC, which is lossy, so a FLAC made from it is a perfect copy of an imperfect source — bigger than the original track and no better sounding. Pick FLAC when the file is going into an editor, an archive, or a further transcode, where every generation of loss you avoid matters. Pick a lossy target when the file is going into your ears.

FLAC vs the Other Extraction Targets

When FLAC Is the Right Target

• The audio is going into an editor, a DAW, or a mastering chain, where you may re-encode several more times and want no additional loss stacking up at this step.
• You are archiving a recording and want the smallest file that is still an exact copy of the decoded audio — FLAC typically lands around half to two-thirds the size of the equivalent WAV.
• You need something a transcription or analysis tool will read without the encoder artefacts a low-bitrate lossy file introduces.
• The source audio was genuinely lossless to begin with, which happens with FLAC or LPCM tracks muxed into Matroska alongside HEVC video. In that case FLAC preserves it exactly and is the obvious choice.

When a Lossy Target Makes More Sense

• You are going to listen to it, not edit it. If the source track was AAC at 128–256 kbps, HEVC to M4A keeps it in the same codec family at a fraction of FLAC's size.
• The file has to go on a phone, in a car, or into an Apple Music library — Apple Music does not import FLAC, and HEVC to MP3 is the safest universal option.
• You are sending it to someone else and file size matters more than fidelity that the source never had.
• You want a spoken-word file. Speech survives a low bitrate well, and a lossless copy of a talk is mostly wasted bytes.

How to Convert HEVC to FLAC

1. Upload Your HEVC File: Drag your .hevc onto the page or click "+ Add Files" to browse. Several files can be queued and processed with the same settings in one pass.
2. Set the Compression Level: Open Advanced Options and move the Compression level slider, which runs from 1 to 12 and starts at 12. Every setting is lossless — the slider trades encode time against file size only, and the decoded audio is identical at 1 and at 12.
3. Set Audio Channel, Audio Sample Rate or Trim: Audio Channel offers Original, Mono and Stereo; Audio Sample Rate offers Original, 8000, 12000, 16000, 24000, 44100 and 48000 Hz. Leave both on Original unless a specific device demands otherwise. Trim → Time Range takes a Start time and a Duration in seconds or HH:MM:SS.sss.
4. Convert and Download: Click "Convert" and save the .flac. Your file is uploaded over an encrypted connection, converted on our servers, and deleted automatically a few hours later. No sign-up, no watermark.

What the Compression Level Slider Really Changes

For context: the reference flac command-line tool exposes levels 0 to 8 and defaults to 5, while the FFmpeg-family encoder this page uses accepts 0 to 12 with a documented default of 5. The extra rungs above 8 buy progressively less size for progressively more CPU, which is why the difference between 8 and 12 on a short clip is usually a rounding error.

Frequently Asked Questions

Will converting to FLAC improve the sound of audio pulled out of a video?

No, and this is the single most common misunderstanding about the format. FLAC is lossless with respect to what it is handed, not with respect to the original recording. The audio muxed alongside HEVC video is almost always AAC — lossy by design — and everything that encoder discarded is already gone by the time our decoder reads it. FLAC then stores those decoded samples exactly, producing a file that is larger than the AAC it came from and identical in sound. The benefit is not fidelity you did not have; it is that no further loss is added, which matters if the file has more editing or re-encoding ahead of it.

My FLAC came out silent or empty — what went wrong?

The source almost certainly had no audio track. HEVC as a standard covers picture only, and a true .hevc file is a bare Annex B elementary stream with no container around it to hold sound. Screen recorders, DVR exports and ffmpeg raw dumps all produce files like that, and no setting can create a soundtrack that was never encoded. Files with a .hevc name that came from our own HEVC converters are different — those are Matroska containers that keep the source audio track — but if yours is a genuine elementary stream, go back to the .mp4, .mov or .mkv the clip was demuxed from and convert that instead.

Should I use FLAC or WAV if I am importing into an editor?

FLAC, in most cases. Both are lossless, so neither adds a generation of loss, but FLAC typically lands at half to two-thirds the size of the equivalent WAV and every current DAW imports it. WAV wins in two situations: when a tool is old or narrow enough to accept only PCM, and when you are working with something long, because WAV's 32-bit RIFF size field puts a practical 4 GB ceiling on a single file that FLAC does not share. If your chain is fine with FLAC, take the smaller file — see HEVC to WAV if you specifically need raw PCM.

Does the compression level change how the FLAC sounds?

Not at all — it changes only how long the encoder thinks and how small the result is. FLAC's compression levels select internal prediction and search settings; the decoder reconstructs exactly the same samples in every case, which is what "lossless" means. Level 12 is the most thorough setting and is where this page starts. Drop it if you are converting a long recording and want it finished sooner; the size difference between the top few levels is small.

Why is my FLAC bigger than the video file's audio track was?

Because you moved from a lossy codec to a lossless one. An AAC track at 128 kbps stores roughly a tenth of the data that the same audio needs when written losslessly, so expanding it to FLAC multiplies the size several times over without adding anything you can hear. That growth is the honest cost of a format that promises not to discard anything. If the size bothers you and the file is only for listening, extract to HEVC to M4A or HEVC to MP3 instead.

Can I keep the original 5.1 surround mix in the FLAC?

The format can — RFC 9639 allows 1 to 8 channels — but this page's Audio Channel control offers Original, Mono and Stereo, so surround only survives if you leave it on Original and the source really carries a multichannel track. In practice most HEVC-carrying containers ship stereo AAC, and the ones that do carry 5.1 usually use AC-3 or DTS. If a downstream tool needs a guaranteed two-channel file, set Audio Channel to Stereo explicitly rather than trusting the source.

Which sample rate should I choose?

Original, unless something downstream insists otherwise. Resampling is a signal-processing step that cannot add information and can only approximate what was there, so changing 48000 Hz to 44100 Hz for no reason is a small unnecessary loss inside an otherwise lossless workflow. Pick a fixed rate when a specific tool demands one — 44100 Hz for CD-oriented software, 16000 Hz or 8000 Hz for speech-recognition input that expects narrowband audio. The dropdown on this page tops out at 48000 Hz.

Will Apple Music or my iPhone play the FLAC?

Your iPhone will, but Apple Music will not import it. iOS Safari has played FLAC in the audio element since version 11, and Safari on the desktop since version 13, so the file opens fine in a browser or in third-party players such as VLC. What Apple's own music library refuses is FLAC as a library format — Apple uses ALAC for lossless instead. If the destination is an Apple Music library, extract to HEVC to M4A; if it is just playback, the FLAC is fine as it is.

Can I extract only part of a long recording?

Yes. Switch Trim from Unchanged to Time Range and enter a Start time and a Duration, in plain seconds or as HH:MM:SS.sss. Only that span is decoded and encoded, which also shortens the job noticeably on a multi-hour capture. If you need several separate excerpts from one file, export the full FLAC first and then split it with the audio cutter.

How are my files handled, and how long are they kept?

Your .hevc is uploaded over an encrypted connection, converted on our servers, and the .flac is returned to you. Uploads and outputs are both deleted automatically a few hours after the conversion — no sign-up, no watermark, and files are never shared or made public. Because FLAC output is several times larger than a lossy equivalent, download time is the thing most likely to surprise you on a long recording; trimming first is the easy fix.