Private browser audio tools
Trim a recording, change volume, shorten quiet gaps, or convert to MP3 or WAV. Choose a task, then a file. Processing stays on your device.
Your selected file stays on this device. No upload, account, or server-side media job.
Choose the part of a recording you want to keep.
Raise the volume and check the result for distortion.
Adjust overall loudness with peak or RMS presets.
Create a smaller MP3 and compare its sound and size.
Save a supported audio file as MP3 or WAV.
Save a separate audio file from your video.
Reduce quiet gaps in a recording and review the timing.
Try light cleanup for steady noise in speech.
Browser-local workspace
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 shared workspace has a focused starting point for cutting, volume, normalization, compression, conversion, extraction, silence shortening, and lightweight speech cleanup. It is not a browser DAW, multitrack editor, or AI restoration studio.
The media engine loads only after the workspace is opened. It checks the selected track, performs supported work in a dedicated worker, then reopens the completed MP3 or WAV result before enabling its download. Unsupported inputs produce a local error rather than an upload.
Private browser handling
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.
Choose an audio task for one local source when you need trimming, level adjustment, compression, conversion, extraction, silence shortening, or lightweight noise cleanup. The browser creates and reopens a separate MP3 or WAV result when the selected operation can finish. Codec support, audible quality, performance, and memory use still depend on the source, browser, device, and task.
| Need | Focused route | Why it matches |
|---|---|---|
| Keep one selected interval from an audio file. | Cut or trim an audio file | The cutter owns explicit start and end times plus MP3 or WAV output. |
| Create a smaller MP3 and inspect its actual bytes. | Compress audio and measure the output size | Compression exposes quality and approximate one-pass byte choices. |
| Turn a supported primary track into MP3 or PCM WAV. | Convert supported audio to MP3 or WAV | Conversion re-encodes the full track and reopens the result. |
| Increase level with linked peak protection. | Increase the volume of an audio file | The gain route reports limiter reduction instead of claiming unclipped restoration. |
| Normalize measured peak or RMS toward a selected target. | Set a consistent listening level with a measured target. | The normalization route distinguishes its measurements from LUFS mastering. |
| Extract a video track into a new MP3 or WAV. | Extract the main audio track from a video | The extraction route accepts video and discards frames while checking the audio result. |
| Shorten long low-level runs without speech recognition. | Shorten silence deliberately, not every natural pause. | The silence route exposes its level-based pause-retention behavior. |
| Reduce steady rumble and hiss around speech. | Reduce steady background noise in speech audio | The cleanup route is bounded filtering, not AI source separation. |
The shared workspace has a focused starting point for cutting, volume, normalization, compression, conversion, extraction, silence shortening, and lightweight speech cleanup. It is not a browser DAW, multitrack editor, or AI restoration studio.
Free Local Audio Tools — Trim, Compress & Convert
The selected audio stays in the current browser session and is not sent to an Aftermath processing service. How local processing is verified.
Checks the displayed limits and reports or creates a separately downloaded MP3 or 16-bit PCM WAV result from one audio file with a primary track supported by the bundled local decoder.
A local audio result does not guarantee universal codec support, audible quality, or platform acceptance.
