Convert MP4 into MP3
in seconds
The fastest, most private MP4 to MP3 converter on the web. Studio-quality 320 kbps, batch processing, advanced editing — all in your browser, completely free.
Why MP4intoMP3 is the best MP4 to MP3 converter online
Engineered for speed, privacy, and audiophile-grade quality. The features other converters charge for — free, forever.
100% Private
Your videos never leave your device. All conversion happens in your browser.
Blazing Fast
Powered by an in-browser conversion engine — no waiting in upload queues.
Unlimited Size
No artificial caps. Convert files of any size, as many as you want, free.
Studio Quality
Up to 320 kbps MP3, 48 kHz sample rate, with optional loudness normalization.
Audio EQ Presets
15 built-in equalizer presets — Bass Boost, Vocal, Podcast, Pop, Rock, Classical, Cinema and more.
Bass & Treble Controls
Independent bass and treble sliders ±10 dB to fine-tune the tone of any track.
Pitch Shift
Shift pitch ±12 semitones independently of speed — perfect for music transposition.
Karaoke / Vocal Remover
Center-channel cancellation strips vocals from songs — make instant karaoke tracks from MP4 music videos.
Smart Silence Trimmer
Automatically detects and removes silence at the head and tail of your audio with a single tap.
Auto Cover Art
Extract a frame from your MP4 and embed it as the MP3 album art — or upload your own custom image.
Split into Segments
Cut a long file into many MP3s every 30 sec, 1 min, 5 min, 10 min — great for long lectures and audiobooks.
A/B Original vs Output
Compare original audio with the converted MP3 in one click to make sure the quality is exactly what you want.
Pro Controls
Trim, fade in/out, speed adjust, volume boost, mono/stereo, sample rate, reverse — all in one place.
ID3 Tags
Embed title, artist, album, year and genre — perfect for music libraries on any device.
Works Everywhere
Any modern browser on Windows, Mac, Linux, Android and iPhone.
Mobile Friendly
Optimized touch experience designed for phones and tablets.
Batch Processing
Drop in dozens of MP4s and convert them all in one go with the same settings.
How to convert MP4 into MP3 — three simple steps
No tech skills required. Just drop your MP4 file, pick MP3, and download. Works on every device.
- 1
Add MP4 files
Drag & drop, click to choose, or paste from clipboard. Supports MP4, MOV, MKV, WEBM and more.
- 2
Pick your settings
Choose MP3 (or WAV/AAC/FLAC/OGG/Opus), bitrate, sample rate. Add fades, trim, or ID3 tags if you like.
- 3
Convert & download
Click Convert. Files are processed in your browser and ready to download instantly. 100% private.
What makes us different
- Truly browser-based — your videos never touch a server
- No daily limits, no premium tier, no upsells
- 15 built-in EQ presets + bass / treble fine controls
- Pitch shift ±12 semitones independent of speed
- Karaoke vocal-remover and smart silence trimmer
- Auto cover art extracted from any MP4 video frame
- Split long files into multiple MP3 segments by time
- A/B compare original vs converted before you save
- Loudness normalization (EBU R 128) for podcasts
- Six output formats: MP3, WAV, AAC, OGG, Opus, FLAC
- Works offline once loaded — even on the subway
Frequently asked questions
Everything you need to know about converting MP4 into MP3 with us.
Is MP4intoMP3 really free?
Yes. Completely free, with no daily limit, no signup, no watermark, and no premium tier. We rely on non-intrusive ads to keep the service alive.
Are my files uploaded to a server?
No. All conversion happens locally in your browser. Your video never leaves your device, which is why it’s safe even for sensitive personal recordings.
What's the maximum file size?
There is no fixed limit because nothing is uploaded. The practical limit depends on your device’s memory — most modern phones handle 1–2 GB easily, desktops can go much higher.
Does it work on iPhone and Android?
Yes. The converter runs in any modern mobile browser (Safari 15+, Chrome, Firefox, Edge, Samsung Internet).
What MP3 quality do you support?
Up to 320 kbps CBR MP3 at 48 kHz, which is indistinguishable from CD quality. You can also export WAV or FLAC for archival use.
Can I convert YouTube videos?
No. We do not download videos from YouTube or other streaming sites — that would violate their terms of service. You need to provide your own MP4 files.
Why does the first conversion take longer?
On first use we load the conversion engine (~25 MB). It’s cached afterwards so subsequent visits are instant.
Do you support batch conversion?
Yes — drop multiple files at once and they will be processed sequentially with your chosen settings.
Have another question? Get in touch.
Ready to convert MP4 into MP3?
Free, fast, private. No signup. Drop your file at the top of the page or click below.
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