Online Audio Studio

How to Use the Online Audio Studio Step by Step

Online Audio Studio is one form and one recording. You load a file, set the parameters, and save the finished result as a WAV file. All processing happens in your browser, on your device.

1. Load one audio file — choose a recording from your computer or phone. It can be any audio format your browser supports.
2. Set the tempo — the available range is 0.5 to 2. A value of 1 leaves the tempo unchanged.
3. Set the pitch in semitones — from -12 to 12. Zero means the recording's pitch will not change.
4. Set the volume in dB — from -30 to 20. Zero leaves the level unchanged.
5. Set the fade-in and fade-out — smooth entry and exit at the start and end of the recording, given in seconds. A value of zero disables this change.
6. Decide whether to play in reverse — select this option if you want the recording to be reversed.
7. Click Run — wait for processing to finish, then save the WAV file to your device.

The order of settings does not matter, because all changes are applied to the same recording during one processing run. Before you save the result, you can return to the settings and run the operation again on the source file.

Tempo and Pitch in Semitones: What They Actually Change

Tempo is a speed multiplier for the recording. A value below 1 slows the material down, a value above 1 speeds it up, and 1 changes nothing. The lowest value in the tool is 0.5, and the highest is 2.

Pitch in semitones works on a different level: one semitone is the smallest step in music, and 12 semitones make an octave. Positive values raise the recording's pitch, negative values lower it, and zero leaves the pitch unchanged.

Semitones are converted to a pitch factor using the formula: factor = 2 to the power of (number of semitones ÷ 12). At 12 semitones the factor is 2, at -12 it is 0.5, and at 0 it remains 1. On that basis, the recording is first stretched or compressed in time, then played back at the new speed. This lets you change tempo and pitch independently.

In practice, it looks like this: if you only want to speed up a recording without raising the voice, you change the tempo and leave semitones at zero. If you only want to change the key, you set semitones and leave tempo at 1.

Volume in dB and How to Avoid Clipping

You specify the volume level in decibels, in the range from -30 to 20. A value of 0 changes nothing, positive values boost the recording, and negative values make it quieter. The tool converts decibels to a regular multiplier using the formula: volume multiplier = 10 to the power of (number of dB ÷ 20). This is a logarithmic scale, so even a small change in the decibel number is clearly audible.

The biggest risk is clipping. If you boost the volume, or apply a boost to material that is already recorded very loudly, the highest sound peaks will be cut off at the maximum level. This sounds like rasping, crackling, and a loss of clarity, especially on strong drum hits and loud vocal sections.

How to deal with it:

• start with small volume changes and increase them gradually;
• if the material is already loud, lower it rather than boosting it;
• pay special attention to choruses, accents, and places where several people speak at once;
• listen to the finished WAV file on the same headphones or speakers it will be used with.

Limitations: What to Know Before You Use It

The tool is deliberately simple, so it has a few practical limits:

• Only one file at a time. You cannot combine several recordings into one or process a whole list of files in a single operation.
• No preview of changes. You will see and hear the effect only in the saved WAV file, so for larger changes it is worth testing them first on a short excerpt.
• WAV output only. You cannot choose another format or compression level — the result is always saved as a WAV file.
• No limiter. The tool does not automatically level the volume and does not protect against clipping, so you are responsible for the loudness.
• Quality depends on the source material. Processing cannot recreate information that is not in the file — a heavily compressed recording will still sound flat.
• Reverse applies to the whole recording. You cannot reverse only a selected section.
• Fade-in and fade-out length is limited by the recording length. Very short files will not accept a long smooth fade-in.
• No other sound operations. You cannot cut sections, combine tracks, add reverb, or adjust tone.
• Processing time depends on file length and device performance. Long recordings may need a moment to process.

Everything happens locally, so your device has to handle the file. If the material is very long and the browser starts to respond more slowly, split the work into smaller source files.

Example Use Cases

Podcasts and spoken recordings. Gently speeding up or slowing down the tempo lets you match an episode's length to your plan, while smooth fade-in and fade-out soften the start and end of the recording. Lowering the volume by a few decibels helps when the material was recorded too close to the microphone.

Karaoke and singing along to backing tracks. Changing the pitch in semitones lets you match the song's key to your vocal range. Leave tempo at 1 and change only the semitones, so the backing track does not slow down or speed up.

Ringtones and short notifications. Smooth fade-in and fade-out keep the sound from starting with a sharp jolt and make it end gently. If you are using a short source file, just set the fade and, if needed, lower or boost the level.

Sound effects. Reverse playback, heavy slowing or speeding up, and pitch changes let you create unusual variants of a single recording — for example, reversed noise, a lowered voice, or a sped-up interface sound.

Materials for online publishing. Before uploading audio to Amazon, Etsy, eBay, Shopify, Vinted, or TikTok, you can standardize the tempo and volume level of several separate files by processing them one after another.

Frequently Asked Questions

Processing happens locally in your browser; make a copy of the file before use, because the studio.wav result can clip when you apply positive dB.