⎯⎯ MP3 → MP4 ⎯⎯

Convert MP3 to MP4
editor-friendly audio tracks.

Drop a file and it's converted right in your browser — nothing leaves your device. Need to crunch huge batches? Flip one switch and let our servers do the heavy lifting.

Converter
Choose where to convert. Keep everything on your device for privacy, or use our servers for huge batches.

Drop your MP3 files here

or browse to upload — drag a whole folder if you like

.MP3 · UP TO 2GB EACH · BATCH SUPPORTED
Encoding options
🎧Music320k · stereo 🎙️Podcast96k · mono 📚Audiobook64k · 22kHz 📱Clip192k · fade 🌐Web128k · VBR 🗄️Archive256k · V0
Pick a starting point — every setting below updates to match. Tweak anything by hand anytime.
64k 96k 128k 192k 256k 320k
320k = transparent quality. 128k = smallest file for voice & sharing.
CBR VBR (V0) VBR (V2) ABR
VBR V0 ≈ 320k quality at a smaller size. CBR is best for streaming.
Match your source unless you have a reason to resample.
Stereo Mono Joint stereo
Mono roughly halves the file — ideal for podcasts & audiobooks.
Normalize loudness (EBU R128)
Trim start / end
Fade in / out
Keep / embed cover art
Carry over tags & artwork, or set them fresh on the way out.
No files yet — drop MP3 files above to get started.
No watermarks Batch conversion Files deleted instantly
Two ways to convert

Your files, your call.

Most people never need to upload anything. But when you've got hundreds of files or a 4-hour live recording, server mode is one click away.

Local mode

The audio is decoded and re-encoded on your own machine — nothing is ever sent over the wire. Perfect for sensitive recordings, demos and client work.

Server mode

Off-load big jobs to dedicated workers. Convert massive batches and multi-gigabyte sessions without tying up your laptop. Files auto-delete the moment your download finishes.

Full control

The same flags engineers reach for on the command line — bitrate, VBR quality, sample rate, channels, loudness normalization, trimming and ID3 tags — exposed as buttons you can actually understand.

Tuned for the job

Presets for what you're really doing.

Pick a use case and the right options snap into place — or tweak everything by hand.

🎧

Music & releases

Ship streaming-ready masters from your DAW without losing detail.

320k · CBR · 44.1kHz · stereo
🎙️

Podcasts

Smaller episodes that still sound clean, with broadcast loudness baked in.

96k · mono · R128 loudnorm
📚

Audiobooks

Tiny files for long-form spoken word that fit anywhere.

64k · mono · 22kHz
📱

Ringtones & clips

Trim to the hook and fade the edges for a clean loop.

192k · trim · fade in/out
🌐

Web & email

Shrink fat WAVs so they actually attach and load fast.

128k · VBR V2
🗄️

Archiving

Reclaim drive space on session backups you rarely reopen.

256k · VBR V0 · keep tags
Loved by creators

People who stopped uploading.

"

I hand off rough mixes to clients all day. Knowing the WAVs never leave my laptop in local mode is the whole reason I switched. The 320k exports are instant.

MR
Mara Reyes
Mixing engineer, Lisbon
"

I batch-convert a season of interviews at once. Server mode chewed through 240 files with R128 loudness while I made coffee. The podcast preset alone saves me an hour an episode.

TO
Theo Okafor
Podcast producer
"

Finally a converter that doesn't hide the settings or slap a watermark on everything. VBR V0, keep my tags, drag, done. It just respects that I know what I want.

JL
Jin Lee
Indie game audio
Read all testimonials
More converters

Other MP3 conversions

Need a different output format? Pick one below — same converter, same privacy options.

MP3 to AAC MP3 to FLAC MP3 to M4A MP3 to M4R MP3 to MP4 MP3 to OGG MP3 to WAV MP3 to WMA
Good to know

Questions, answered.

Is my audio really private in local mode?+
Yes. In local mode the conversion happens entirely inside your browser. Your files are read from disk into memory, encoded, and handed straight back to you as a download — they never touch a network connection or a server.
What bitrate should I pick?+
192k–256k AAC in MP4 is standard for video workflows. Match your project sample rate when resampling.
When should I use server mode instead?+
Server mode shines for large batches (dozens or hundreds of files), very long recordings, or low-powered devices like phones and tablets. The encoding runs on dedicated workers, and your uploads are deleted automatically once you've downloaded the results.
Can I convert more than one file at a time?+
Absolutely — drag in as many MP3 files as you like, or drop a whole folder. Your chosen options apply to the entire batch, and you can download everything as a single zip.
Does it keep my metadata and cover art?+
By default we carry over existing ID3 tags and embedded artwork. You can also overwrite the title and artist, or attach new cover art, on the way out.

Drop a file. Done in seconds.

No account, no upload by default, no nonsense. MP4 audio tracks from MP3 sources.

Start converting