Audio2MIDI.orgAudio2MIDI.org

midi to mp3

MIDI to MP3 Converter

Render MIDI with a real grand piano or a clean synth. Nothing is uploaded.

.mid → mp3
Free

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MID — up to 10 MB per file

Only upload files you have the right to use.

  • MID
  • Up to 10 MB per file
  • Free · no sign-up
  • Files stay in your browser

Related tools

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ABefore / after

See what changes

Drag the divider to compare. Drawn from demo data, not a model result.
Before · Quantized to 1/16After · Rendered audio
Demo · Prelude in C, BWV 846 — J.S. Bach · Solo piano · public domain
BHow it works

How to convert MIDI to MP3

Drop a .mid file into the converter, choose a sound, Grand piano or Synth, and pick a bitrate: 128, 192 or 320 kbps. Mute any tracks you don’t want, render, and download the MP3. Everything happens in your browser, so your MIDI file never leaves your device.

  1. Step 1

    Open a MIDI file

    Drag a .mid or .midi file onto the page, or choose one from your device. Type 0 and Type 1 files work, and you can preview playback before you render.

  2. Step 2

    Choose sound and quality

    Pick Grand piano for a realistic piano or Synth for a light, quick render. Set the bitrate and mute any tracks you want to leave out.

  3. Step 3

    Render and download

    The converter plays the file into an audio buffer, usually faster than real time, encodes it to MP3 and hands you the download. No watermark, no account.

CWhat you get

What you get

  • F.01

    Sampled grand piano

    Render with Splendid Grand Piano, a public-domain set of real piano recordings. Its velocity layers change the tone as well as the volume, so soft passages sound soft.

  • F.02

    Built-in synth voice

    Need a quick reference render or a lighter sound? The synth needs no download and renders fast, which helps with long or busy MIDI files.

  • F.03

    128, 192 or 320 kbps

    Choose a small file for sharing or 320 kbps, the top MP3 bitrate, for your final copy. The bitrate guide below helps you pick.

  • F.04

    Mute tracks before rendering

    Leave out the drums, a click track or the part you want to play yourself, and render a practice track in one pass.

  • F.05

    No upload, no watermark

    The MIDI is read and rendered on your device. The MP3 is yours: no audio tag, no sign-up, no ads.

  • F.06

    Keep going with the same file

    Need lossless audio? Render the same MIDI with MIDI to WAV. Want to fix a note first? Open it in the MIDI Editor.

DWho uses it

Who uses MIDI to MP3

  • Composers and songwriters

    Send a demo to a collaborator who doesn’t own a DAW. An MP3 plays on any phone and in any chat app, while a .mid file often won’t.

  • Piano students and teachers

    Turn a MIDI file into a practice track. Mute the right-hand track, render, and play the melody yourself over the left hand.

  • Choirs and ensembles

    Make rehearsal tracks from a MIDI arrangement. Mute the other parts so each section hears its own line, then share the MP3s.

  • Game and app developers

    Render a MIDI theme for platforms that can’t play MIDI. For music that loops, render WAV instead, since MP3 adds a short gap at the loop point.

EAccuracy & limits

How accurate is it?

The MP3 follows the MIDI file’s notes exactly: same pitches, timing and tempo changes, with velocity shaping the dynamics. What changes is the sound. A MIDI file holds no audio, so the result depends on the instrument that plays it. Piano music sounds closest to a real recording.

Measured accuracy: results published at launch.How we measure →
SourceResultWhat to expect
Solo piano MIDI, Grand piano soundGoodSampled piano with velocity layers. The closest to a real recording this tool makes.
Any MIDI, Synth soundGoodClean and light. Useful as a reference render or for long files.
Multi-instrument arrangementsFairStrings, brass, guitar and other parts play with the piano or synth voice, not their own instruments.
Drum tracksFairDrums use a simple synth voice. Mute the drum track if it distracts.
Sustain pedal, pitch bend and other controllersFairController data may not render as it does in your DAW, so heavily pedaled passages can sound drier.
FTips

Tips for better results

A render can only be as good as the MIDI behind it. These habits make an audible difference.

  1. Vary your velocities. MIDI exported from notation apps often plays every note at the same velocity, which sounds mechanical on a sampled piano.
  2. Use Grand piano for piano music and Synth for drafts, long files and quick checks.
  3. Mute what you don’t need. Click tracks, drums and doubled parts make the render busier and louder.
  4. Pick 192 kbps for everyday listening and sharing. Choose 320 kbps if the MP3 is your final copy.
  5. For gapless loops in games or apps, render WAV. MP3 encoding pads the start and end with a few milliseconds of silence.
  6. If the render sounds harsh or distorted, lower velocities or mute doubled parts. Many loud notes stacked together can clip.
  7. If the MP3 starts with dead air, trim the silence at the start of the MIDI in your DAW before you render.
  8. Hear a wrong note? Fix it in the MIDI Editor, then render again.
GCompared

MIDI to MP3 vs. desktop software and other online converters

You can render MIDI in a DAW or a desktop synth, and plenty of sites convert MIDI online. Here’s how the options compare on the features that matter for a quick render, limited to what we could check.

MIDI to MP3 vs. desktop software and other online converters
FeatureAudio2MIDI.orgDesktop softwareOther online converters
Nothing to installYesNoYes
File stays on your deviceYesYesVaries
Realistic piano sound out of the boxYesDepends on the appVaries
Full General MIDI instrument setNoDepends on the app or SoundFontVaries
Choose the MP3 bitrateYesUsuallyVaries
Mute tracks before renderingYesYesVaries
No watermark, no sign-upYesUsuallyVaries
FreeYesVariesVaries

Checked October 2026

HFormats & limits

Formats and limits

Input
  • .mid and .midi files, Type 0 and Type 1
  • MIDI from any DAW, notation app or keyboard, or from our transcription tools
Output
  • MP3 at 128, 192 or 320 kbps
Limits
  • Two sounds: a sampled grand piano and a built-in synth; no full General MIDI bank yet
  • Drum tracks play with a simple synth voice
  • Rendering runs on your device, so long files take longer on older phones
  • The piano samples download the first time you choose Grand piano
Works with
Any music player, phone or browser · Video editors and presentation apps · Messaging apps and email · DAWs that import MP3
IField notes

A MIDI file has no sound of its own

MIDI is a set of instructions, not a recording. A .mid file says which notes to play, when, for how long and how hard, plus tempo changes and which instrument each track should use. It’s closer to a player-piano roll than to an MP3. That’s why MIDI files are tiny, often a few kilobytes for a whole song, and why many phones, apps and websites can’t play them at all.

Converting MIDI to MP3 means performing the file. A synthesizer plays every note into an audio buffer, and an encoder compresses that audio into an MP3. Audio2MIDI.org does both steps in your browser: the Web Audio API renders the notes, and an MP3 encoder based on LAME runs locally on your device.

The upside is portability: an MP3 sounds the same everywhere. The trade-off is that the choices you make at render time, instrument, bitrate and which tracks play, are baked in. Keep the MIDI file in case you want to change them later.

General MIDI, SoundFonts and why renders sound different

General MIDI, introduced in 1991, standardized 128 instrument numbers: program 1 is Acoustic Grand Piano, 25 is a nylon-string guitar, 41 is Violin, and channel 10 is reserved for drums. A General MIDI file can say “play this track on a violin”, but not what that violin should sound like. Each player supplies its own sounds, usually from a SoundFont or a built-in sample set.

That’s why the same file can sound grand on one system and toy-like on another. A large orchestral SoundFont and a tiny phone synth follow the same notes, but their samples, envelopes, reverb and velocity response all differ.

This converter takes a focused approach: a sampled grand piano for piano music and a lightweight synth for everything else. It doesn’t include a full General MIDI bank yet, so a string quartet will render with piano or synth rather than strings. If you need every instrument, render in a DAW with sounds you like, and use this tool for quick piano renders and drafts.

Which MP3 bitrate should you choose?

Bitrate is how much data the MP3 spends on each second of audio. Higher bitrates keep more detail and make bigger files. A minute of audio takes roughly 1 MB at 128 kbps, 1.4 MB at 192 kbps and 2.4 MB at 320 kbps.

128 kbps is fine for quick previews and small attachments. 192 kbps is a sound everyday choice; on phone speakers and earbuds, most people won’t hear much difference above it. 320 kbps is the highest bitrate MP3 supports. Choose it when the MP3 is your final copy, or for solo piano, whose long decays reveal compression on good speakers.

If the audio is headed into a DAW, a video editor or a mastering chain, skip MP3 and render a WAV with MIDI to WAV. Every MP3 encode throws some information away, and re-encoding a lossy file stacks up artifacts. Lossless WAV keeps everything for the next step.

Getting a natural piano render

Piano MIDI that sounds stiff usually has one of three problems: flat velocities, missing pedal, or notes cut short. Files exported from notation apps often play every note at the same velocity. Recorded files tend to sound more natural because they keep the player’s touch.

Before you render, shape the velocities in your DAW: a melody a little louder than the accompaniment, phrases that rise and fall, softer inner voices. If the sustain pedal was recorded as controller data, consider lengthening the pedaled notes so the render rings the way it did when you played it.

JFAQ

MIDI to MP3 FAQ

Open your .mid file in the converter above, choose Grand piano or Synth, pick 128, 192 or 320 kbps, and render. The MP3 downloads straight to your device. The whole process runs in your browser, so there’s nothing to install, no account to create and no upload to wait for. Mute tracks first if you want to leave parts out.

Yes. MIDI to MP3 runs entirely in your browser, so there’s no server cost to pass on and no reason to stamp your audio. The MP3 has no audio watermark, no intro jingle and no length cap tied to a plan. You don’t need an account, and there are no ads on the page.

Two sounds are available: Grand piano and Synth. Grand piano uses Splendid Grand Piano, a set of real piano recordings released into the public domain, with several velocity layers. Synth is a lightweight built-in voice that needs no download. Drum tracks play through a simple synth voice with either option. A full General MIDI sound set isn’t included yet.

You can switch between Grand piano and Synth, and mute individual tracks. Other instruments, such as strings, guitar or brass, aren’t available as separate sounds yet, so those tracks play with whichever voice you choose. For a full orchestral render, open the MIDI in a DAW and use its instruments, then export audio from there.

Because MIDI carries notes, not sounds. Your DAW plays the file through its own instruments, effects and mix settings, such as reverb, EQ and compression, and none of those are stored in the .mid file. This converter uses its own piano or synth, so the notes match but the tone, room sound and balance won’t. Pedal and controller data can also be handled differently. To capture your DAW’s exact sound, bounce audio from the DAW itself.

No. Your MIDI file is opened, rendered and encoded inside your browser, on your own device. It isn’t sent to our servers, and we don’t keep a copy. The only thing your browser downloads is the piano sample set, the first time you choose Grand piano, and that download is the same for everyone.

Choose 192 kbps for everyday listening and sharing; it balances quality and file size well. Pick 320 kbps when the MP3 is your final copy, or for solo piano played on good speakers. Use 128 kbps for small previews and email attachments. If you plan to edit or mix the audio later, render a WAV instead.

KNext

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MIDI to MP3 is free and runs in your browser. Drop a file and hear the result.