RashTools

    Audio Converter

    Convert audio files between formats

    or drop an audio file here

    Convert Any Audio

    Supports MP3, WAV, OGG, FLAC, AAC, AIFF, ALAC, WMA, AMR, M4A and OPUS formats.

    Fast & Local

    All conversions happen in your browser. No uploads — fast, private, and secure.

    Free & Secure

    100% free with no file size limits. Your files never leave your device.

    Convert audio between MP3, WAV, OGG and M4A

    Change audio format in the browser and choose the bitrate or sample rate the destination needs.

    Formats that editors and uploads accept

    WAV for editing, MP3 for sharing, OGG for the web, M4A for Apple devices — convert to whichever one is currently blocking you.

    Try this tool
    Formats that editors and uploads accept

    Voice notes into normal files

    Messaging apps export voice notes in formats desktop software often ignores. Converting to MP3 makes them playable and attachable anywhere.

    Open Text to Speech
    Voice notes into normal files

    Control the quality settings

    Pick the bitrate and sample rate rather than accepting a fixed preset, so speech stays small and music stays clean.

    Open Compress MP3
    Control the quality settings

    Step-by-step guide

    How to use Audio Converter?

    Convert MP3, WAV, OGG, M4A, FLAC, AAC and other audio formats right in your browser.

    Step-by-step instructions

    1. 1

      Upload one or many audio files (mix formats freely).

    2. 2

      Choose the target format (MP3, WAV, OGG, M4A, FLAC, AAC, OPUS, WMA).

    3. 3

      Adjust the bitrate for lossy formats if needed.

    4. 4

      Click Convert and wait a few seconds.

    5. 5

      Download the converted files individually or as a ZIP.

    Benefits

    • Supports 9+ formats including modern OPUS and legacy WMA.
    • Lossless-to-lossless conversion preserves the original waveform.
    • Batch convert an entire music folder in one go.
    • Runs on FFmpeg.wasm in your browser — no upload.

    Who is it for?

    • Podcasters converting iPhone M4A voice memos to MP3
    • Music lovers turning FLAC into space-saving AAC
    • Game developers preparing OGG assets

    FAQ

    Frequently asked questions

    MP3 Converter Online Free is a browser-based tool that converts individual audio files such as WAV (.wav), M4A (.m4a/.mp4 audio) and OGG (.ogg) to MP3 (.mp3) without creating an account. To use it, click the Choose File button (or drag-and-drop), pick your file, set the bitrate/sample-rate if offered, then press Convert to MP3 and wait for the Download MP3 button to appear. The conversion runs in your browser so there’s no server upload step; if you close the tab you must restart the process.

    Open the site, click Choose File and select your .wav file, then click Convert to MP3 and Download MP3 when ready. WAV is uncompressed PCM so converting to MP3 reduces file size dramatically; choose 128 kbps for spoken audio (~0.94 MB per minute) or 320 kbps for music (~2.4 MB per minute) depending on quality needs. If the file is larger than ~150 MB on desktop you may see slowdown; for very long WAV files use a desktop tool like Audacity or FFmpeg for batch processing.

    Yes — click Choose File and select your .m4a, then Convert to MP3 to get an .mp3 output; common M4A files that contain AAC audio convert reliably in Chrome and Firefox. Note that some M4A containers can hold Apple Lossless (ALAC); browsers don’t always decode ALAC, which can trigger an Unsupported codec or Conversion failed message. If that happens export the file as WAV in iTunes or Audacity first, or use a desktop converter that supports ALAC before re-encoding to MP3.

    The site accepts .ogg (typically Vorbis or Opus) and converts it to .mp3, but remember you are re-encoding from one lossy format to another so some quality loss is inevitable. For music choose 256–320 kbps MP3 to reduce audible artifacts; for speech 96–160 kbps is usually sufficient and keeps files small. The tool shows a Download MP3 button when finished; if you need lossless preservation, export to WAV or FLAC first and avoid double lossy transcodes.

    The converter handles one file per conversion operation — there is no batch upload interface, so convert multiple files sequentially. On desktop Chrome and Firefox files up to about 150 MB usually convert without issues; on mobile Safari and low-memory devices you should keep files under ~50 MB to avoid browser crashes. If you have very large or many files, use a desktop app like FFmpeg or Audacity which supports batch scripts and higher memory usage.

    The tool exposes common MP3 bitrate choices such as 64, 96, 128, 192, 256 and 320 kbps and sample-rate choices like 22.05 kHz, 44.1 kHz and 48 kHz in the conversion panel. As a rule of thumb 128 kbps produces about 0.94 MB per minute, 192 kbps ~1.4 MB per minute and 320 kbps ~2.4 MB per minute, so higher bitrates give better fidelity at the cost of larger files. Choose 44.1 kHz and 256–320 kbps for music, or 44.1 kHz and 96–128 kbps for podcasts and voice to balance quality and size.

    No signup or account is required — you click Choose File, convert and download immediately; the site is free to use and does not add watermarks to the MP3 file. The service is supported by on-page ads and rate limits may apply during heavy use; for high-volume professional workflows consider a paid desktop solution. You also won’t have to hand over an email address, but ads and occasional prompts may appear because the service is free.

    Conversions are performed client-side in your browser, so the file bytes are processed locally rather than being uploaded to a remote server; this means no network transfer of your audio file during conversion. Keep in mind large files are held in browser memory and may consume significant RAM; closing the tab aborts the conversion and you'll need to reselect the file. For absolute assurance check your browser’s network inspector — you should not see a POST upload to an external endpoint during conversion.

    First verify the file extension and codec with a tool like VLC or MediaInfo — the site supports common audio codecs inside WAV, M4A (AAC) and OGG (Vorbis/Opus), but exotic codecs may fail. If the browser reports Unsupported codec, export the audio to WAV in Audacity or iTunes and retry, or use a desktop converter like FFmpeg to transcode to a standard PCM WAV before using the online tool. Also try Chrome or Firefox on desktop if you encountered the error on mobile Safari, and reduce file size if memory-related failures occur.

    On Android Chrome and Firefox you can use drag-and-drop or file picker and conversions are similar to desktop, but on iOS you must use Safari’s file picker or the Share sheet to select files from the Files app. iOS Safari has tighter memory limits, so conversions of files larger than ~50 MB can fail or crash; if that happens move the file to a computer and convert there. After Download MP3 on iOS you may need to long-press the file link and choose Save to Files to keep the MP3 locally.

    Use MP3 Converter Online Free when you need a quick single-file conversion without installing software, creating accounts or dealing with project settings — it’s ideal for one-off WAV/M4A/OGG to MP3 jobs. Desktop apps like Audacity, HandBrake or FFmpeg are better for batch conversions, precise editing, loudness normalization, metadata/ID3 control and rare codecs (ALAC, high-resolution FLAC). If you regularly convert many files or need detailed control (VBR profiles, channel remixing), switch to a desktop workflow for speed and stability.

    For music pick 256–320 kbps and 44.1 kHz to preserve clarity; for spoken-word or podcasts choose 96–160 kbps and mono to save space. Check and add ID3 tags after download with a tag editor if the site doesn’t preserve metadata, and normalize or trim audio in Audacity before converting to avoid clipping or unnecessary length. If you need lossless archival, keep a WAV or FLAC copy — converting to MP3 is lossy, and repeated recompression degrades quality.

    About this tool

    Online audio converter — convert MP3, WAV, OGG, M4A, FLAC, AAC

    If you've ever tried to play an Apple Music M4A file in an older car stereo, send a high-quality WAV through WhatsApp, or load a FLAC track into a video editor that only understands MP3, you already know how often audio formats need a quick swap. Our online audio converter handles every common format — MP3, WAV, OGG, M4A, AAC, FLAC, AIFF, OPUS and WMA — using FFmpeg compiled to WebAssembly, which is the same engine professional editors like DaVinci Resolve and Audacity use. The difference is that ours runs entirely inside your browser tab, so there's nothing to install and nothing to upload.

    Conversion is genuinely lossless when you're going from one lossless format to another (WAV ↔ FLAC, AIFF → WAV), meaning every bit of the original waveform is preserved. For lossy targets like MP3, AAC or OGG, we default to balanced bitrates that almost no one can tell apart from the source — 192 kbps for MP3 and AAC, 160 kbps for OGG — but you can override the bitrate manually if you're squeezing audio for a low-storage device or archiving at maximum quality.

    Common things people convert here: voice memos from iPhone (M4A) into MP3 for podcast editing, FLAC concert recordings into smaller AAC for phone playback, WAV studio exports into OGG for game development, vintage WMA files into modern MP3 so they actually play on a 2026-era phone, and OPUS voice notes into WAV for transcription software that can't read the newer codec. Drop a folder of mixed formats in and the converter handles every file in the same batch.

    Drop dozens of tracks in at once — the converter queues them up, processes them one after another, and bundles the results into a single ZIP download when it's done. Because everything is running locally on your device, there's no upload limit, no privacy concern about unreleased music or sensitive interview audio leaking to a server, and no bandwidth cost on a metered mobile connection.

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