Audio Input Formats
The converter accepts around 30 audio formats, including all the ones you are likely to meet in the wild: WAV, M4A, AAC, OGG, FLAC, WMA, AIFF, Opus, ALAC, AMR, AC3, and APE, among others. This covers modern lossless formats, legacy Windows and Mac formats, phone-recording formats, and codecs ripped from discs or streams. If you are not sure what a format actually is, our guides on WAV, FLAC, and AAC are a good place to start. If a file will not upload, check that its extension matches its real contents- A renamed extension is the most common cause of a rejected file.
Extracting Audio From Video
You can also upload a video file and receive just its soundtrack as an MP3. Around 24 video formats are supported, including MP4, MOV, MKV, AVI, and WebM. This is the quickest way to turn a lecture recording, concert clip, or screen capture into a listenable audio file- See our MP4-to-MP3 guide for a walkthrough. Keep in mind that video files are large, so the per-file size limit of your plan is the constraint you will meet first.
Output Formats: MP3 and Beyond
The primary output is MP3, with your choice of bitrate. But conversion also works in the other direction: mp3.now offers MP3-to-X converters for 16 audio target formats, so you can turn an MP3 into WAV for editing, M4A for Apple devices, or OGG for game engines. Unsure which direction to go? MP3 vs WAV and lossy vs lossless explain the trade-offs.
Beyond Format Conversion
A set of utility tools handles the jobs that usually follow a conversion: compress an MP3 to a smaller size, trim a clip out of a longer track, merge several MP3s into one, normalize loudness, change bitrate or playback speed, convert stereo to mono, or jump straight to a fixed target with 320 kbps and 128 kbps presets. All tools share the same file-size limits as the converters.