More level, with peak protection
Gain follows the requested decibel change rather than an arbitrary percentage. A linked limiter protects both channels around a −1 dBFS ceiling instead of hard-clipping samples.
Local volume booster
Increase the volume of an audio file
Choose +3 dB, +6 dB, +12 dB, or a custom increase. The local worker applies that gain and a stereo-linked limiter with a protective −1 dBFS ceiling before encoding the result.
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.
Make heavy limiting clear
The completed result reports the strongest limiter reduction. Raising level can make a recording easier to hear, but it cannot recreate detail absent from a quiet, clipped, or noisy source.
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.
How to use this tool
Use this route when a local audio file needs a specific gain increase rather than normalization to a measured target. Choose a preset or custom gain; the worker applies it to decoded samples, follows it with stereo-linked peak protection, reports the strongest limiter reduction, and writes a separate MP3 or 16-bit PCM WAV. Raising level can improve audibility, but it cannot repair distortion or recreate missing source detail.
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 with a preset or custom non-negative gain choice.
- Stereo-linked peak protection during the gain operation with limiter reduction reported in the result.
- A verified separate MP3 or 16-bit PCM WAV export.
Before you start
- Automatic loudness matching, LUFS normalization, calibrated acoustic measurement, or restoration of clipped samples.
- Noise removal, time editing, video input, or a server fallback for an unsupported source codec.
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 this route when you know how much gain to add and want linked peak protection.
- Use /normalize-audio when the worker should first measure peak or unweighted RMS and calculate gain toward a target.
- Use /remove-background-noise for steady speech noise or /audio-tools when the intended processing outcome is unclear.
- Compare the reopened result with the source because heavy limiting can change dynamics.
Worked example
A quiet voice recording needs a moderate gain increase without allowing measured peaks to clip.
Starting facts
- The source is decoded locally.
- Gain changes signal level but cannot recover missing or distorted detail.
Observed operation: Choose the gain, retain linked peak protection and encode a separate MP3 or WAV through the local worker.
Review the result: Listen to the result and inspect peak warnings, noise increase and the reopened output facts before download.
Boundary: Peak protection is not mastering, broadcast loudness compliance or a guarantee against every audible distortion.
What you can do
Apply a chosen gain to one local audio file with linked peak protection and export MP3 or WAV
Choose another tool when
- Target-based peak or unweighted RMS analysis belongs to /normalize-audio.
- This route cannot restore detail already lost to clipping, noise, or prior compression.
- It does not measure calibrated dB SPL, clean noise, trim time, or change an existing video source.
If it does not work
- An unreadable or undecodable primary audio track cannot enter the local gain pipeline.
- An invalid gain setting is rejected rather than passed to the processor.
- Unsupported local encoding or a result that cannot be reopened as audio prevents a successful download.
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
Target-based peak or unweighted RMS analysis belongs to /normalize-audio.