Add a track
Drag an audio file into Sonic or pick one from your device. The file stays in your browser while it is processed.
Browser-native audio converter
Convert your files.
Convert your files.
Boost the sound.
Convert audio files and lift quiet tracks right in your browser. No account, no upload queue, no waiting on a server.
Start converting
Your audio stays on your device
Sonic Studio
Local processing
Convert your audio
Drop an audio file here, or tap to choose
MP3, WAV, FLAC, AAC, OGG, M4A and other browser-decodable audio
Choose fileMP3 encoding loads the open-source lamejs encoder. Your selected audio is not uploaded.
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Preparing audio…
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Getting started
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Convert audio in three steps
Choose the output
Select MP3 or WAV, pick a bitrate for MP3, and optionally raise the loudness or fine-tune the volume.
Download
Sonic encodes the finished file locally and gives you a direct download, with no remote conversion queue.
Audio formats
Pick the right format for the job
Audio formats trade off compatibility, file size and how much of the original signal is preserved. Sonic exports to MP3 for wide compatibility and to WAV for uncompressed PCM audio, while many common formats can be used as input depending on what your browser can decode.
MP3
Portable and widely supported
Use MP3 when you need a smaller file that plays on many devices and services. The bitrate lets you balance file size against encoded quality.
WAV
Uncompressed PCM
WAV suits editing, production or archiving when you want uncompressed PCM output. Files are much larger than compressed formats.
FLAC
Lossless source
FLAC is a lossless source that works well when you want to decode a high-quality recording before exporting it to MP3 or WAV.
AAC · OGG · M4A
Common compressed sources
Modern recordings often arrive as AAC, OGG or M4A. Whether they open depends on your browser and operating system.
Loudness enhancer
Make quiet audio easier to hear
Some recordings stay quiet even when your device is already at 100%. Sonic can raise the signal level while respecting a peak ceiling, which helps with voices, lectures, demos and tracks exported too low.
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Smart Enhance
Analyzes the decoded signal and picks a cautious gain based on the headroom available at the peaks, instead of blindly applying a fixed multiplier.
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Peak protection
Gain is limited by a −1 dBFS ceiling to reduce digital clipping caused by samples exceeding the maximum range.
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Manual control
Choose +3, +6, +9 or +12 dB for a predictable amount of gain, combined with the fine volume control. Peak protection may limit the requested boost.
Conversion guide
Common audio conversion workflows
WAV to MP3
Useful when a large PCM recording needs to become a smaller file that is easy to share. Choose 256 or 320 kbps for a higher-bitrate encode.
FLAC to MP3
Turn a lossless music library into compact MP3 copies for devices, messaging or any case where space matters more than lossless delivery.
MP3 to WAV
Creates an uncompressed WAV file from the decoded MP3 stream. It does not restore information that MP3 encoding already removed.
Boost a quiet recording
Use Smart Enhance or a small manual gain when a track is hard to hear at normal volume. Moderate amplification is usually better than an aggressive boost.
Local processing
Your audio stays in the browser
No upload to convert
Sonic decodes, processes and encodes the selected audio in your browser. Your file is loaded into local memory and turned into a downloadable file on your device.
Good for sensitive recordings
Local processing is useful for meetings, classes, interviews, private voice notes or any recording you would rather not send to a third-party conversion service.
No cloud queue
There is no remote conversion job waiting for a server to be free. Speed depends mainly on your browser, your device and the length of the recording.
Browser limits still apply
Local processing uses the memory and CPU your browser has available. Very large files need far more resources than a short recording.
FAQ
Frequently asked questions about Sonic
Which formats can Sonic convert?
Sonic can use audio formats your current browser can decode, including common MP3, WAV, FLAC, AAC, OGG and M4A files. The current output formats are MP3 and WAV.
Does Sonic upload my audio files?
The conversion runs in your browser. Sonic reads, decodes, processes and encodes the selected file locally instead of sending it to a conversion server. MP3 encoding code is loaded from a public CDN; audio content is not uploaded by Sonic.
Is Smart Enhance LUFS normalization?
No. Smart Enhance uses signal-peak analysis and peak protection. It is not standards-based LUFS normalization.
Can boosting the volume remove distortion?
No. Boosting changes gain; it does not repair clipping, background noise or microphone distortion. A poor source file can still be noisy after it is made louder.
Does converting MP3 to WAV improve quality?
No. WAV is uncompressed, but converting an already compressed MP3 to WAV does not bring back the detail the MP3 encoder removed. It mainly changes the output format.
Is Sonic free?
Yes. Sonic is a free, browser-native audio tool within the RuntimeHub ecosystem, with no account needed for the basic conversion workflow.