Instant, Reliable, Ad-Free - MP3 Converter Web Service. Convert WAV, AIFF into MP3 format in seconds, from your phone, tablet or laptop, on the go. Choose 320, 192 or 128 kbps, select your files, and download — fast processing quality, no ads, nothing to install, runs from your own account.
Upload your audio, choose your bitrate, and collect a distribution-ready MP3 in moments.
Even today, converting audio to MP3 is still a chore. Open files in apps, settings, and set the file properties for exporting them. We make the process much simpler. Wherever you are, on your phone or on the go, just upload your audio anywhere through our web services; we’ll handle the rest, instantly, 24hrs 365 days a year. Handy when you're on the go!
Upload your WAV, AIFF or MP3 straight from your browser — drop several to queue them.
320 kbps for best quality, or 192/128 for smaller files. Our MP3 converter encodes it cleanly. It's also the perfect tool for getting your podcast audio file ready for distribution.
Download your MP3 in instantly and on any device, Save to your mobile phone, ipad or desktop. MP3s make the perfect files to share over email.
Clean encoding, full control over quality, and none of the ads or quality loss you get from free online converters.
Clean, transparent encoding up to 320 kbps CBR from our own pipeline — your MP3 sounds like your source, not a generation down.
Optimised conversion. Drop it in and it just works — nothing to configure.
Choose 320, 192 or 128 kbps — full control, instead of one anonymous default.
Your files are yours. Processed securely and never sold, shared, or mined for ads.
No pop-ups, no fake download buttons, no bundled installers. Just the tool.
Drop multiple tracks to queue them, convert in one go, and download your MP3s together.
Create a free account and convert your first files on us. Need more? Go unlimited any time.
Yes, it's a personal web service, with no install: just log into your account, upload from your audio files, and download the converted MP3s right back. Just log into our portal and convert on the go.
Yes, create a free account, and your first conversions are on us, no card needed. For regular or unlimited use, there's a simple paid plan.
WAV, AIFF and MP3. Lossless sources like WAV and AIFF give the cleanest MP3, because the encoder starts from the full original signal.
MP3 is a compressed format, so some data is discarded — but at 320 kbps the difference is inaudible to almost everyone. Our pipeline encodes cleanly, without the muddiness cheap converters add.
320 kbps for the best quality (recommended for music), 192 kbps for a smaller file that still sounds great, 128 kbps for the smallest size.
Yes. Files are sent over a secure connection, used only to create your MP3, and deleted after conversion — never shared or reused.
No. It runs entirely in your browser — desktop or phone. Nothing to download or install.
Create your account in seconds and hear the ST Mastering difference for yourself.