Convert audio files online
Convert an audio file from one format to another in a few clicks. Drop in an MP3, WAV, OGG or M4A, choose the output format, and In1 re-encodes it in your browser. Your audio is never uploaded — the whole conversion happens on your device.
How to use Audio Converter
- 1
Add your audio
Drag an MP3, WAV, OGG or M4A file into the drop area, or click to choose one from your device.
- 2
Choose the output format
Pick MP3, WAV, OGG or M4A as the format you want to convert to.
- 3
Convert
Click convert and In1 re-encodes the audio locally in your browser. The first run loads the engine.
- 4
Download
Save the converted file. Your audio was never uploaded anywhere.
Convert between the formats that matter
Audio comes in many formats, and the one you have is not always the one you need. MP3 is the universal standard that plays everywhere and keeps files small. WAV is uncompressed, lossless audio — large, but perfect when you need maximum quality or a format that audio editors and many devices accept without fuss. OGG (Vorbis) is a free, open format that often sounds better than MP3 at the same size and is common in games and on the web. M4A (AAC) is the format favored across the Apple ecosystem and many modern devices, offering great quality at small sizes. In1 converts freely between all four, so whether a website only accepts MP3, an editor wants WAV, or a device prefers M4A, you can get your audio into exactly the right format in seconds — without hunting for a desktop program or trusting an upload site. Understanding the difference helps you choose well: the lossy formats (MP3, OGG, M4A) discard inaudible detail to stay small, while WAV keeps every sample. Converting a lossy file to WAV will not restore quality that was already removed — it just makes a bigger file — so the best results come from starting with the highest-quality source you have and converting outward to whatever each destination needs.
Pick the right format for the job
Choosing a format is really about matching the destination. Reach for MP3 when you want something that plays on absolutely anything and stays small — it is the safest default for sharing and for portable players. Choose WAV when quality is paramount or when a tool specifically asks for uncompressed audio, such as some editing software, voice-processing pipelines or certain instruments and samplers; just expect a much larger file. Pick OGG when you want strong quality at a small size and the target supports it, which is typical for web apps and game engines. Go with M4A when you are working in the Apple world or want efficient, high-quality compression on modern hardware. Because the conversion is instant and free, you can always try a format, check that it plays where you need it, and convert again if something prefers a different one.
Runs in your browser — private and free
Every conversion happens entirely on your own device using ffmpeg compiled to WebAssembly. Your audio file is read into memory, re-encoded locally and handed straight back to you — it is never uploaded to a server, stored or logged, and there is no account to create. That privacy matters more than people assume: voice memos, interview recordings, demos of unreleased music, confidential meeting audio and personal messages are exactly the kind of files you should not be sending to an unknown website just to change their format. With In1 there is no upload, no watermark and no daily limit. Because the work is local it leans on your device's processor, so a very long recording takes longer to convert, but for typical songs, clips and voice recordings the conversion finishes quickly and there is no waiting on an upload or a server queue.
The first conversion loads the engine
Since the conversion engine runs locally, the ffmpeg core downloads to your browser the first time you use an audio or video tool here. It happens once and is then cached, so later conversions start much faster and even work offline. While the engine loads and while your file is processing, a progress indicator shows that the tool is working. To stay responsive and avoid running out of memory, there is a sensible size limit on the file you can convert, because browser-based processing keeps the audio in memory; for the occasional very long recording a desktop application may be a better fit. For everyday audio, though, the in-browser approach gives you the convenience of an online converter with the privacy of an offline one — no install, no sign-up and nothing leaving your machine.
Who converts audio and why
The need turns up constantly. Musicians and producers convert WAV masters to MP3 for sharing, or MP3s to WAV to drop into an editor. People with voice memos or recordings in M4A convert them to MP3 so they play on a device or platform that is fussy about formats. Podcasters convert between formats to meet a host's requirements. Gamers and developers turn audio into OGG for engines that expect it. Students convert recorded lectures to a smaller format to save space, and transcription users convert audio into a format their software accepts. Anyone who has ever been told 'this format isn't supported' has needed an audio converter. In every case the goal is the same: take the audio you have, turn it into the format you need at a sensible quality, and do it quickly, privately and for free. It works hand in hand with the MP4 to MP3 tool as well: extract a soundtrack from a video there, then convert it here to WAV for editing or M4A for an Apple device. With both tools running locally in the same place, moving audio between formats stops being a chore that needs special software and becomes a quick, private step you can do anytime, on any modern browser.
Higher limits, batch processing and an API are on the way. Want early access?