Audio format
What is a MP3 file?
MP3 is the format that made digital music mainstream — lossy compression that plays back on essentially every device made in the last 25 years.
MP3 (MPEG-1 Audio Layer III) was developed by the Fraunhofer Institute and standardized as part of MPEG in the early 1990s, and it became the format that made portable digital music practical in the first place — shrinking a CD-quality track down to roughly a tenth of its uncompressed size by discarding audio detail the human ear is least sensitive to. Decades later, despite the rise of more efficient codecs like AAC and Opus, MP3 remains the safest choice whenever compatibility is the priority, since there's essentially no device or piece of software made in the last two decades that can't play it.
How to open a MP3 file
MP3 files open readily in Any media player, Any web browser, Every phone and car stereo made in the last two decades. For real editing rather than just viewing, reach for Audacity (free), Adobe Audition.
Strengths & limitations
Good for
- universal playback support
- small files at a reasonable bitrate
Watch out for
- lossy — some audio detail is discarded permanently
Convert MP3 files
Orbfile can convert MP3 both ways, entirely in your browser — pick a direction below:
Frequently asked questions
What does a MP3 file contain?+
MP3 is the format that made digital music mainstream — lossy compression that plays back on essentially every device made in the last 25 years.
Can I convert MP3 for free?+
Yes — Orbfile's audio converter handles MP3 for free, with no file limit, watermark, or account, and it runs entirely in your browser.
Is converting a MP3 file safe and private?+
Yes. Orbfile processes MP3 files locally on your device using WebAssembly — nothing is uploaded to a server, so there's nothing to leak or store.
Who created the MP3 format?+
MP3 was developed by Fraunhofer Institute / MPEG, first released around 1993.
Browse the full file format guide.