T ≈ t / v
Audio Editor
Edit audio locally with a waveform, transport controls, recording, trimming, equalizer, volume, speed, format conversion and export.
- Export
Start your audio project
Drop an audio file here or choose an option below.
Recording…
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How does this tool work?
A short audio edit should not require a different page for every adjustment. Bethemesh Audio Editor puts waveform navigation, trimming, recording, gain, speed, fades, equalization and conversion into one workspace. Start with an existing track or capture a recording through your microphone. Each operation works on the current result, so you can make several changes before a single final download. The audio stays on your device rather than being uploaded for processing.
Drop an MP3, WAV, OGG, FLAC, M4A, AAC, Opus or WebM audio file onto the workspace, or select Record. Click the waveform to seek and drag across it to select a time range. The Start and End fields provide more precise trimming than dragging alone. Pick any action from the left-hand rail; its controls appear in the right inspector. Apply the transform, play back the new result and continue editing it. Undo and Redo let you navigate a limited history without changing the file on your disk. Compare the original with the edited version before export. Most transforms generate intermediate WAV PCM files. MP3, FLAC, OGG, M4A and Opus encoding uses the existing FFmpeg/WASM runtime, which may need to load on first use. The silence remover detects quiet passages by their level, not by transcribing speech. Merge appends multiple files in order; it does not layer their playback. Split channels offers a pair of separate left/right WAV downloads. Initial controls include 100% gain, 1× speed, zero pitch shift, three EQ gains at 0 dB and a −16 LUFS target. History keeps at most eight states and reduces intermediate states when they total roughly 110 MiB; it is not a saved project. The editing surface limits each imported file to 180 MiB. Effects process the complete working file. A waveform selection defines trimming, rather than automatically restricting every effect to that region. Native intermediate WAV files use 16-bit PCM; repeated lossy export should be avoided.
How to use this tool
Import or record
Drop an audio file or use the microphone in the same workspace.
Edit and preview
Choose an action, change its settings and apply it to the current result.
Export
Compare the original and edited audio, then pick a download format.
Audio Editor — Calculation reference
T = end − start
- T
- Duration in seconds
- t
- Duration in seconds
- v
- Speed ratio, dimensionless
- start, end
- Selection boundaries in seconds
Use cases
Prepare a voice-over
Record a take, trim dead air, adjust loudness and download a compatible file.
Make a short clip
Select the useful segment, add fades and export it for a presentation.
Improve an audio track
Balance bass, mids and treble, change speed or pitch and normalize the result.
Examples
Prepare a spoken quotation
42 − 12 = 30; 30 ÷ 1.5 = 20. Tempo processing can introduce a small duration difference depending on the signal.
Input
Trim from 12 s to 42 s, then use 1.5× speedResult
30-second excerpt, then approximately 20 sMake a take quieter
The gain multiplies amplitude by 0.5. It reduces existing background noise by the same factor rather than separating it from speech.
Input
50% gain on a sample with amplitude 0.6Result
Amplitude 0.3 before PCM quantizationTips and best practices
- Keep the original until you are happy with the export.
- Use the numeric start and end times when a cut must be precise.
- Excessive gain may introduce clipping; loudness normalization is a different operation.
- Long uncompressed WAV files and editing history consume browser memory.
- Merge joins files sequentially rather than mixing them into overlapping tracks.
Sources and references
- W3C, Web Audio API (opens in a new tab)Page in English
- W3C, MediaStream Recording (opens in a new tab)Page in English
- FFmpeg project, FFmpeg Filters Documentation (opens in a new tab)Page in English
- FFmpeg project, FFmpeg Formats Documentation (opens in a new tab)Page in English
- European Broadcasting Union, EBU R 128 — Loudness normalisation and permitted maximum level of audio signals (opens in a new tab), 2023Page in English
Frequently asked questions
Can I apply several edits?
Yes. The editor keeps working on the current output and provides a bounded undo history.
Does the audio leave my device?
No user audio is uploaded. A processing module may be fetched from a CDN when first required.
Which formats can I download?
Choose MP3, WAV, FLAC, OGG, M4A or Opus in the export panel.
Does Merge create a multitrack mix?
No. It concatenates the files in order. For overlapping tracks, use a dedicated multitrack editor.
Does selecting a region restrict equalization or normalization?
No. The selection determines the continuous excerpt kept by trimming. Other operations process the current file; trim first if you need to work on just that excerpt.
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