Convert audio files locally to MP3, WAV, FLAC, OGG, M4A or Opus.
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Category
Audio
Convert, trim, merge and adjust audio files directly in your browser with free tools designed for local processing.
23 tools available · 2 subcategories · 23 embeddable widgets
All toolsAudio conversion 7
Convert audio files locally and prepare batch audio workflows.
Convert a WAV file to MP3 locally in your browser.
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Convert an M4A file to MP3 locally in your browser.
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Convert an MP3 file to WAV PCM locally in your browser.
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Convert a FLAC file to MP3 locally in your browser.
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Convert an OGG file to MP3 locally in your browser.
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Extract and convert WebM audio to MP3 locally in your browser.
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Audio editing 16
Trim, merge and adjust audio files locally.
Record, trim, adjust volume, apply effects and convert audio in one editor.
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Keep only the useful part of an audio file.
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Increase or reduce the volume of an audio file.
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Join multiple audio files in the selected order.
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Reduce audio file size by choosing an output format and bitrate.
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Normalize the perceived loudness of an audio file to a LUFS target.
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Speed up or slow down an audio file without changing pitch.
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Add fade-in and fade-out effects to an audio file.
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Convert audio to mono or stereo.
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Resample audio to 44.1 kHz, 48 kHz or another rate.
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Reverse an audio file directly in your browser.
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Split the left and right channels of stereo audio into two mono files.
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Remove overly long silent sections from an audio file.
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Record your voice directly in the browser without uploading it.
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Raise or lower audio pitch by semitones without changing duration.
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Adjust bass, midrange and treble directly in your browser.
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Why this category?
Why use audio tools?
Audio files often need several operations before they are ready to share or reuse. This category brings conversion, trimming, volume adjustment and merging into consistent tools that can be used on their own or reused as transformations inside the Workspace.
Processing is built around one shared audio engine so tools, widgets and pipelines apply the same operations. Web Audio is used when the browser can process the file directly; FFmpeg/WASM is loaded on demand for codecs and filters that require it.
Use cases
Prepare an audio excerpt
Trim the useful part of a recording without uploading the source file to a server.
Adjust audio level
Increase or reduce a file's volume before using it in another piece of content.
Combine several files
Merge tracks or recordings in the required order using the same engine as the Workspace.
All these tools are also available as widgets
Add tools from this category to WordPress, Webflow, Wix, or any HTML page with the same local processing.
Related resources
GuideBest practicesIntermediate
Normalize audio volume: peak, RMS and LUFS
Understand peak level, RMS and LUFS, when normalization is useful, and how to make several audio files sound more consistent.
30 August 20262 min
GuideFormatsIntermediate
Audio compression: bitrate, format and quality
Learn how bitrate, lossy and lossless compression affect audio quality and file size, and choose sensible settings for distribution.
30 August 20262 min
GuideBest practicesBeginner
Change audio speed, add fades and reverse sound
Understand speed changes, fade-ins, fade-outs and audio reversal, with practical advice for editing and reusable browser workflows.
30 August 20262 min
GuideConcepts and technologiesIntermediate
Audio sample rate: 44.1 kHz, 48 kHz and resampling
Understand sample rate, why 44.1 kHz and 48 kHz are common, and when converting an audio file sample rate is actually useful.
30 August 20261 min
GuideConcepts and technologiesBeginner
Mono, stereo and audio channels: convert or separate them
Learn the difference between mono and stereo, when downmixing is useful, and how to split left and right channels into separate files.
30 August 20261 min
GuideFormatsBeginner
MP3, WAV, FLAC, OGG, Opus and M4A: which audio format should you choose?
Compare common audio formats, compatibility, compression and typical uses to choose the right working, archive or distribution format.
30 August 20262 min
Frequently asked questions
Are audio files uploaded to a server?
No. User files are processed locally in the browser. The FFmpeg/WASM core may be downloaded on demand the first time an operation requires it, but the media itself is not sent to Bethemesh.
Which output formats are available?
Depending on the operation, Bethemesh can produce WAV PCM or convert to MP3, WAV, FLAC, OGG Vorbis, M4A (AAC) and Opus.
Can these operations be reused in a pipeline?
Yes. Compatible audio transformations reuse the same engine across tools, widgets and Workspace modules.