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Free · In-browser · No upload

Audio Converter.

Turn browser-supported audio into WAV or MP3 with the bitrate, sample rate and channel layout you need, without uploading the selected file to AudioWrench.

Before-and-after illustration of Audio Converter: Source audio file becomes Converted file through Decode and encode.
Before → process → afterSee the signal story, then hear it in the workspace.

FILE STRUCTURE MAP

Format Conversion Route

Follow audio, metadata and delivery as separate layers. Container work is easier to trust when decoded audio, editable fields and the final export are shown as distinct stages with explicit preservation limits.

Before-and-after illustration of Audio Converter: Source audio file becomes Converted file through Decode and encode.
Source audio fileDecode and encodeConverted file
A file pipeline: source bytes and decoded content pass through explicit structure rules before a new, inspectable delivery is written.
Open the full signal breakdownBest source, processing logic, limits and three-pass listening check
  1. Source audio file

    Start with the right material

    Preparing a compatible WAV, shrinking a source to MP3 or making a mono speech file.

  2. Decode and encode

    Understand the transformation

    The browser decodes to PCM, then JavaScript resamples, downmixes if requested and re-encodes the result.

  3. Converted file

    Verify the usable result

    MP3 at the available bitrate settings, or 16-bit/32-bit-float WAV depending on the chosen option.

Format settings

Where this workflow stops

Input support depends on the browser, and the tool does not write FLAC, AAC or OGG. Lossy-to-lossy conversion adds generation loss and long files are memory-limited.

THREE-PASS CHECK

Make the final decision by ear

  • Keep the untouched original until the exported file is verified.
  • Confirm sample rate, channels, duration and metadata independently.
  • Test the delivery in the application or device that will consume it.

How to convert audio online

  1. Drop your file into the upload box — the converter shows its duration, sample rate and channel count.
  2. Choose the output format: MP3, 16-bit WAV or 32-bit float WAV, plus the MP3 bitrate if relevant.
  3. Optionally resample (48 000, 44 100 or 22 050 Hz) or mix stereo down to mono.
  4. Press Convert & Download — the finished file lands straight in your downloads.

This audio converter works inside your browser: the source is decoded with browser codecs, optionally resampled or mixed to mono, then encoded as MP3 or written as WAV. Output is limited to MP3 and WAV; it does not write AAC, FLAC or OGG. Inputs have a 200 MB cap, and codec support, speed and practical duration depend on the browser and available device memory.

Use it to shrink WAV recordings into shareable MP3s, convert browser-decodable FLAC or M4A sources to MP3/WAV, prepare 44.1 kHz files, or make mono versions of stereo recordings. For a video source, use Video to Audio to decode and re-encode its soundtrack first.

Audio Converter: quick answer and technical limits

Quick answer: A local audio transcoder that decodes any browser-supported source and writes MP3 or WAV with selected rate and channel settings.

Best for
Preparing a compatible WAV, shrinking a source to MP3 or making a mono speech file.
How it works
The browser decodes to PCM, then JavaScript resamples, downmixes if requested and re-encodes the result.
What you get
MP3 at the available bitrate settings, or 16-bit/32-bit-float WAV depending on the chosen option.

Know before you use it: Input support depends on the browser, and the tool does not write FLAC, AAC or OGG. Lossy-to-lossy conversion adds generation loss and long files are memory-limited.

Public browser workflow evidence

Question: Can the real UI turn a stereo 48 kHz WAV into a mono 22.05 kHz float32 WAV while preserving duration and both authored tones at the expected downmix levels?

Observed result: The two-second stereo fixture became a 22,050 Hz mono float32 WAV (176,444 bytes); both authored tones remained at the expected downmix levels.

Evidence boundary: This case covers WAV-to-WAV conversion, one downmix and one output rate. MP3 encoding and every browser-decodable input codec remain outside this wave.

Network observation: No audio-payload or cross-origin requests were observed during this published workflow.

Open the public benchmark, method and fixture →

Privacy: Selected audio is processed in this browser and is not uploaded to AudioWrench. Normal page assets can still be requested as described in the privacy notice. Privacy details →

FAQ

Which formats can this audio converter read and write?
Input support depends on browser codecs and may include MP3, WAV, FLAC, OGG or M4A/AAC. Output is MP3 at 128–320 kbps or WAV as 16-bit PCM or 32-bit float. It does not write AAC, FLAC or OGG; WAV is uncompressed but conversion is not necessarily bit-perfect.
Are my files uploaded during conversion?
No. Decoding, resampling and encoding run on your device, and the selected file is not uploaded to AudioWrench. Normal page assets can still be requested as described in the privacy notice. Inputs are capped at 200 MB; available memory and browser codec support can impose lower practical limits.
What is the best MP3 bitrate to choose?
320 kbps is the safest choice for music — most listeners cannot distinguish it from lossless. 192 kbps is a good size/quality balance for casual listening, and 128 kbps halves the size again, which suits speech and voice notes more than music.
Does converting MP3 to MP3 lose quality?
Yes, a little — every MP3 encode is lossy, so re-encoding an MP3 stacks a second generation of loss even at 320 kbps. It is usually inaudible once, but avoid repeated round-trips; convert to WAV instead when you plan to edit the file further.