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Local audio converter

Convert supported audio to MP3 or WAV

Choose MP3 for a smaller compatible file or WAV for uncompressed 16-bit PCM. The worker decodes the primary audio track, re-encodes it locally, and verifies the completed result before download.

Your selected file stays on this device. No upload, account, or server-side media job.

Browser-local workspace

Choose a local source to begin.

Choose one local audio file—or a local video on the conversion route—then create a separate, verified MP3 or WAV result. The source is not sent to Aftermath, modified, or handed to a fallback service.

No upload, account, or server-side media job.

The local workspace loads after you choose a source.

Use one encoding pipeline for conversion and compression

Conversion and compression share one local pipeline that decodes, optionally changes channel count or sample rate, encodes, and checks one selected file. Conversion starts with preservation-oriented settings rather than a small-file preset.

Two clear output choices

The available outputs are MP3 and 16-bit PCM WAV. The workspace does not advertise M4A, AAC, Opus, or original-codec packet copying, and an unsupported source is never sent to a conversion server.

Private browser handling

Your source remains under your control.

Aftermath reads, decodes, processes, encodes, and verifies the selected file in this browser. It preserves the source and offers a separate MP3 or WAV result; unsupported inputs are never sent to an upload fallback.

Read the processing boundary

How to use this tool

Use Audio Converter when the complete primary track of an existing local audio file should remain while its output representation changes. Choose MP3 or uncompressed 16-bit PCM WAV; the worker decodes and re-encodes the full track, preserves source sample rate and channels where the selected path supports them, optionally requests descriptive metadata, and reopens the result. It does not choose a cut range, remove silence, boost level, or accept video input.

What to choose and what you get

What to choose

  • one selected local audio file

Result

  • a separately downloaded MP3 or 16-bit PCM WAV result

Supported use

  • One decodable local audio file whose primary track should be re-encoded in full.
  • MP3 output for a compact compatible result or uncompressed 16-bit PCM WAV output.
  • Preservation of source sample rate and channel count where supported, with optional descriptive-metadata carryover.

Before you start

  • Video-file input, range selection, automatic silence removal, gain processing, normalization, or denoising.
  • AAC, M4A, Opus, FLAC, Ogg, or original-codec output and guaranteed preservation of every metadata field.

Supported formats

  • Accepted formats: MP3, WAV, M4A, AAC, Ogg, Opus, FLAC.
  • Output formats: MP3, WAV.

Browser support and permissions

  • Modern browser with JavaScript and support for the selected audio container and codec; memory and performance vary by device.
  • No camera, microphone, or screen permission is needed.

Choose the right settings

  • Use Audio Converter when the whole primary audio track should remain and the required output is MP3 or WAV.
  • Use /audio-cutter when only one chosen range should remain, or /compress-audio when a smaller-byte trade-off is the main goal.
  • Use /extract-audio-from-video for video input and /audio-tools when the desired processing outcome is still broad.
  • Review metadata and track facts in the reopened result before replacing the source.

Worked example

A supported local audio file needs a full-track 16-bit PCM WAV copy for a compatible editing workflow.

Starting facts

  • The primary audio track is readable locally.
  • Conversion does not improve information already lost in the source.

Observed operation: Decode the full primary track, encode a separate WAV and reopen it to verify duration, channels and format.

Review the result: Listen to the result and compare duration, channel layout and audible content with the source before editing.

Boundary: The route does not preserve every tag, secondary track, bit depth or specialist production requirement.

What you can do

Re-encode the full primary track of one supported local audio file as MP3 or 16-bit PCM WAV

Choose another tool when

  • Selecting and keeping only part of the track belongs to /audio-cutter.
  • Extracting a primary audio track from a video belongs to /extract-audio-from-video or the MP3-specific video route.
  • This route offers MP3 and 16-bit PCM WAV only; it does not output AAC, M4A, Opus, FLAC, or an original-codec packet copy.

If it does not work

  • A selected video, missing primary audio track, or undecodable source is rejected for this audio-file conversion route.
  • The chosen MP3 or WAV path can fail when its source decoder or local encoder configuration is unsupported.
  • The result is withheld if its signature is wrong or it cannot be reopened with a readable audio track.

Things to know

  • Codec support, performance, and memory use vary by browser, device, source, and operation.

Privacy boundary

The selected audio stays in the current browser session and is not sent to an Aftermath processing service. How local processing is verified.

What this tool verifies

Checks the displayed limits and reports or creates a separately downloaded MP3 or 16-bit PCM WAV result from one selected local audio file.

Check before sharing

Selecting and keeping only part of the track belongs to /audio-cutter.

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