# Audio converter to MP3, right in your browser This free audio converter turns M4A, WAV, OGG, OPUS, FLAC and other formats into MP3 on your own device, with M4A and WAV as options. The file never leaves your browser, so voice notes and private recordings stay with you. - Free - Runs in your browser - MP3, M4A or WAV ## How to convert audio to MP3 Most converters upload your audio to a server first. This one does the work inside your browser tab, so private recordings stay on your device. 1. **Choose the files**: Pick one recording or several. They convert one after another. 2. **Pick format and quality**: MP3 or M4A at 128, 192 or 320 kbps. WAV is uncompressed and has no quality setting. 3. **Save the result**: Press Convert and save each file to your device, ready for any player or for transcription. ## What this audio to MP3 converter handles ### Voice notes OGG and OPUS voice messages from chat apps, as MP3s any player opens. ### iPhone memos M4A from Voice Memos, as MP3 for older players and editors. ### Recorder WAV Large WAV files from a recorder, as much smaller MP3s. ### FLAC and others FLAC, AAC, AMR, WMA and AIFF, all as MP3. ## What the converter does | Converter | | |---|---| | Price | Free | | Where it runs | In your browser, on your device | | Your file | Stays on your device the whole time | | Input | MP3, M4A, WAV, AAC, OGG, OPUS, FLAC, AMR, WMA, AIFF | | Output | MP3 or M4A at 128, 192 or 320 kbps, or uncompressed WAV | | Several files | Drop them at once, they convert one after another | Want the text too? Upload the MP3 for transcription, free for the first 5 minutes of each file on a free account. ## Your file stays with you The converter runs inside your browser. Your file is read and converted on your own device, and no copy reaches Kotosay or anyone else. ## Tools - [MP4 to MP3 converter in your browser](https://kotosay.com/mp4-to-mp3) - [audio transcription for voice memos and calls](https://kotosay.com/audio-to-text) - [MP3 to text converter](https://kotosay.com/mp3-to-text) - [transcribe audio to text free](https://kotosay.com/free-transcription) ## Using the online audio converter ### How the audio converter works The page loads a small conversion program into your browser. It reads the file on your device and writes a new MP3 next to it. Your computer or phone does the work, and nothing is uploaded. That makes it an online audio converter in name only. Once the page is open, the file stays on your device the whole time. ### How do I convert M4A to MP3? Pick the M4A on this page, convert it and save the MP3. iPhone Voice Memos are M4A, so on an iPhone, first share the memo to Files, then pick it from there in your browser. To convert M4A to MP3 on a computer, drag the file onto the page. ### How do I convert WAV to MP3? The same way. A WAV file from a recorder holds uncompressed sound, so turning a WAV file to MP3 makes it far smaller while speech sounds the same. That helps when you want to send a recording by email or keep it on your phone. ### Voice notes from chat apps Voice messages saved from chat apps are often OGG or OPUS, which some players and editors refuse. Converting them to MP3 lets any device play them, and keeps the conversation on your own device while you do it. ### Older formats from phones, recorders and Macs Some recordings arrive in formats that few players open any more. The audio converter reads them and writes a file that a phone, a car stereo or a laptop plays without extra software. - AMR comes from call recorders and voice notes on older Android phones and basic mobiles. - WMA comes from older Windows recordings and some handheld dictation recorders. - AIFF comes from GarageBand and other Mac audio programs. - FLAC comes from lossless music rips and from stores that sell lossless downloads. ### Quality and file size Converting to MP3 or M4A compresses the sound. From WAV or FLAC, the file shrinks a lot and speech stays clear. From M4A, OGG or OPUS, which are already compressed, the new file keeps the quality of the source and adds none. Choosing WAV writes uncompressed sound, which some editors prefer, and the file grows much larger. Tip: Need the text of the recording? Upload the original file for transcription. Every common format uploads directly, and the first 5 minutes of your first file are free. ### MP3, M4A or WAV for the job at hand MP3 plays almost everywhere, from car stereos and old MP3 players to smart TVs and every browser. Choose it when you are not sure where the file will end up. M4A is the format Apple uses for voice memos and music. Choose it when the file stays on an iPhone, iPad or Mac, or goes into GarageBand. WAV suits editing. If you plan to cut a recording in an audio editor and export it again, start from WAV, so the sound is compressed only once, at the final export. ### Where the converted file lands On a computer, the file goes to your browser's downloads folder, unless the browser asks where to save it. On an iPhone, Safari puts it in Downloads in the Files app. On Android, look in Downloads in the Files app or your file manager. Rename each file as soon as it lands, for example with the date and the person speaking. After a day, a stack of converted voice notes all looks the same. ### When a file will not convert A file in iCloud Drive or Google Drive that shows only a cloud icon is not on your device yet. Download it first, then pick it again on this page. The converter takes files up to 1 GB. If a large file stalls or the page says it is too big for this device, close other tabs to give the browser more memory, or move the recording to a computer. The online audio converter works in your browser's memory, and a laptop has more of it than most phones. ## Audio converter questions ### How do I convert audio to MP3? Pick the file on this page and press Convert. Your browser rewrites it as an MP3 on your own device, and you save it to your files. M4A, WAV, OGG, OPUS, FLAC, AAC, AMR, WMA and AIFF all work. Nothing is uploaded, so private recordings stay with you. ### How do I convert M4A to MP3? Choose the M4A file on this page, convert it and save the MP3. On an iPhone, share the voice memo to Files first, then pick it in your browser. The conversion runs on your phone or computer, so the memo never leaves your device. ### How do I convert WAV to MP3? Drop the WAV file onto this page and press Convert. The MP3 is much smaller than the WAV, because WAV is uncompressed, while speech sounds the same. That makes recorder files easier to email, store on a phone or upload for transcription later. ### Which bitrate should I choose for MP3? For speech, 128 kbps is plenty and keeps the file small. For music you care about, choose 192 or 320 kbps, and WAV skips compression altogether. If you only want to transcribe the recording, upload the original file instead, because every common format uploads directly and converting first adds nothing. ### Is the audio converter free? Yes, the audio converter is free. It runs inside your browser on your own device, so it uses no Kotosay server time. Convert voice notes, memos and recordings to MP3 whenever you need to, and keep the original file next to the new one. ### Can I convert several files at once? Yes. Drop several files at once and they convert one after another on your device. Choose the format and quality once, press Convert and save each file when it is done. A laptop gets through a stack of recordings faster than an older phone, and every file stays on the device. ### Is my audio uploaded? No. The converter works inside your browser, and your audio stays on your device from start to finish. That suits voice messages, calls and other private recordings. Only if you choose to transcribe a file does it go to Kotosay, as a separate upload. ### Can I convert a WhatsApp voice note to MP3? Yes. Save or export the voice note from the chat first. It is usually an OPUS or OGG file. Pick it on this page, convert it and save the MP3. You choose the file yourself, so the converter only ever sees the recording you picked, and it stays on your device. ### Will converting lose quality? From WAV or FLAC, the MP3 is much smaller and speech sounds the same. From M4A, OGG or OPUS, which are already compressed, the MP3 keeps the quality of the source and adds none. Keep the original if you might need the best version later. ### Does it work on my phone? Yes, in a current mobile browser on iPhone or Android. Pick the file from Files, the file manager or your downloads, convert it and save the MP3. Phones convert more slowly than computers, so long recordings are quicker on a laptop. - [Kotosay](https://kotosay.com/audio-converter) ## Site language - [Português](https://kotosay.com/pt-br/converter-audio-para-mp3.md) - [Español](https://kotosay.com/es/convertir-audio-a-mp3.md) - [Bahasa Indonesia](https://kotosay.com/id/konversi-audio-ke-mp3.md) - [Français](https://kotosay.com/fr/convertisseur-audio-mp3.md) - [Italiano](https://kotosay.com/it/convertitore-audio-mp3.md) - [Deutsch](https://kotosay.com/de/audio-konverter.md) - [Türkçe](https://kotosay.com/tr/ses-mp3-cevirme.md) - [العربية](https://kotosay.com/ar/audio-converter.md) - [日本語](https://kotosay.com/ja/audio-converter.md)