FLAC to MP4 Converter

Wrap a FLAC track in an MP4 video so you can upload it where only video is allowed, like YouTube and Instagram. Free, in your browser, no signup.

Select FLAC file →

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Choose Files

Click or drag and drop to upload files

We support most file types including: MP4, MOV, WEBM, AVI, MP3, WAV, PNG, JPEG, GIF, MKV, PDF, FLAC, TIFF!

EchoWave is used by creators, marketers, educators, and businesses to convert and edit media online.

Updated June 2026

YouTube, Instagram, and TikTok want video, not a bare FLAC, so a great-sounding track gets rejected before anyone hears it. Converting FLAC to MP4 wraps your audio in a video with a simple visual, so it uploads anywhere a video does. The sound rides along in full, and you can swap in cover art or a waveform in the editor.

Free, no sign-upNo account, no trial

Runs in your browserNothing to install

Works on every devicePhone, tablet, laptop

No watermarkClean output, every time

How it works

How to convert FLAC to MP4

1
Upload your FLAC
Drag your FLAC onto the converter or pick it from your device. Nothing to install.
2
Choose MP4 and convert
Select MP4 as the output. Your audio is placed into a video with a clean background.
3
Download your MP4
Save the MP4 ready to upload, or open it in the editor to add a cover image first.

Try it

Estimate your MP4

Pick a video bitrate and a length to see the MP4 file size before you convert.

Video bitrate

Length5 min

1 min30 min

Estimated MP4 size183MBSharp 1080p

An estimate. Real size varies with resolution, frame rate, and how much the picture moves.

The formats

FLAC vs MP4

FLAC

Free Lossless Audio Codec

Lossless audio at about half the size of WAV

Type: Lossless audio format
Holds: Compressed audio with no quality loss
Typical size: About half the size of WAV
Plays on: VLC and most players, not older iPhones by default

Best for:Archiving music at full quality

MP4

MPEG-4 Part 14

The video format that plays everywhere

Type: Video container
Holds: H.264 video plus AAC audio, sometimes subtitles
Typical size: Large, it carries video
Plays on: Phones, browsers, TVs, almost any player

Best for:Watching and sharing video

Will it look and sound right?

Your audio is kept at full quality inside your new MP4 video, so nothing is lost from the sound.
The picture is a simple visual because the source is audio only. Add a cover image or waveform in the editor for a richer look.
A longer track makes a larger video, since the file carries a picture for every second.

Use cases

What people use it for

MusiciansPost tracks to video sites

PodcastersPublish episodes on YouTube

TeachersShare a lesson as video

CreatorsMake an audiogram to share

SocialUpload where video is required

Troubleshooting

If something looks off

The video is just a still image

That is expected, since the source is audio only. Open the MP4 in the editor to add a cover image, logo, or animated waveform.

It will not upload to YouTube or Instagram

Most sites want MP4. Convert to MP4 for the widest support, then upload the video file.

The file is large

Video files are bigger than audio because they store a picture for every frame. A shorter track or a plain background keeps the size down.

FAQ

FLAC to MP4 questions

Is the FLAC to MP4 converter free?

Yes. EchoWave converts FLAC to MP4 with no signup, no file-count limit, no trial, and no watermark. Upload your FLAC, convert it, and download the MP4 from your browser.

Why turn a FLAC into an MP4 video?

Sites like YouTube, Instagram, and TikTok only accept video uploads, so a plain audio file is rejected. Converting FLAC to MP4 lets you post a song, mix, or podcast where audio alone would not go through.

Will the MP4 just be a blank screen?

It starts with a simple visual because the source is audio only. Open the editor to add cover art, a logo, or an animated waveform so the video has something to watch while it plays.

Does the MP4 keep the FLAC audio quality?

Your audio is carried into the MP4 at full quality, so nothing is lost from the sound itself. MP4 stores the audio as AAC, which is plenty for streaming and uploads, and the original FLAC fidelity is preserved as closely as the container allows.

Can I add my own image or cover art?

Yes. Open the MP4 in the editor to set a cover image, add a title, or layer in a waveform before you share it, so the video matches your channel.

Why is the MP4 larger than my FLAC?

A video stores a picture for every frame on top of the audio, so it is bigger than an audio-only file. Keeping the background simple and the clip as short as you need keeps the size down.

How long can the audio be?

There is no fixed limit on these pages, so full songs and long podcast episodes are fine. Longer tracks make larger videos and take a little more time to upload and convert.

Does the FLAC to MP4 converter work on iPhone, Android, Mac, and Windows?

Yes. The converter runs in any browser, so you can convert FLAC to MP4 on iPhone, iPad, Android, macOS, Windows, Chromebook, and Linux with nothing to install.