Voice recorded on a phone or laptop mic often has a low hum, harsh "s" sounds, or is so quiet you have to turn it way up. The "one-click studio sound" features paid services advertise are really a fixed chain of processing steps. This guide explains that chain step by step and shows how to do the same thing in your browser with our One-Click Studio Sound tool.
What to get right while recording
Post-processing has limits, so a little care while recording goes a long way.
- Keep your mouth about a hand's width (15 to 20 cm, 6 to 8 inches) from the mic. Too close gives popping breath noise; too far makes room echo louder.
- Record in a room with soft things like curtains, bedding or a closet full of clothes to cut echo. Empty rooms and bathrooms echo a lot and are hard to fix later.
- Turn off things that run constantly, like AC units, fans and fridges. Steady noise reduces well, but none is better.
- Set the level so the loudest parts reach about 70 to 80% of the meter. Clipped (distorted) audio that hits red cannot be recovered.
The processing chain, and why this order
One-click studio sound processes in this order. Changing the order changes the result, so it follows common practice.
- High-pass filter: cuts rumble and desk thumps below 80 Hz first. Voices have almost nothing there, so tone is unaffected.
- Hum reduction: narrowly cuts 60 Hz mains hum and its harmonics.
- Noise reduction: reduces background noise with the standard (RNNoise) or high-quality AI (GTCRN) engine. Strength depends on the preset.
- De-esser: gently pulls down the highs only at moments when sharp "s" and "ts" sounds spike.
- Voice EQ: slightly reduces boomy frequencies around 200 Hz and slightly boosts clarity around 3 kHz.
- Compression and leveling: narrows the gap between quiet and loud parts so the voice sounds even from start to finish.
- Loudness and limiter: finally sets overall loudness to the target LUFS and keeps true peaks under -1 dBTP.
Choosing a preset
- Podcast: -16 LUFS, comfortable for long listening on earbuds.
- YouTube narration: -14 LUFS, close to YouTube's playback reference so your video won't sound very different from others.
- Lecture recording: stronger noise reduction and leveling to handle classroom echo and distance.
- Phone call: phone audio has no real highs, so it tidies up unused bands and makes the speech band clearer.
How to check the result
When processing finishes, switch between "Original" and "Processed" at the same position. Louder always sounds better at first, so the tool also shows numbers (LUFS, peak, estimated speech-to-noise ratio) for an objective comparison. If the voice sounds muffled or underwater, or word endings get chopped, noise reduction is too strong. In that case, process with lower strength in the Voice Noise Remover, then set the level with the Loudness Meter & Normalizer (LUFS).
Where do my files go?
All processing happens in your browser on this device. Recordings are not uploaded, and even the high-quality AI engine only downloads a small model file from FreeSoundTools. You can safely clean up meeting recordings or private calls you'd rather not send anywhere.
When to process separately
If several people recorded on one mic and their volumes differ a lot, leveling can boost the quiet speaker's breathing too. Remove noise first, set only the overall level with the loudness tool, and listen. With music mixed in, EQ and de-essing can change the instruments too, so work from a voice-only original when you can.
Sources and date checked
Checked: October 6, 2026
- xiph/rnnoise — https://github.com/xiph/rnnoise
- GTCRN — https://github.com/Xiaobin-Rong/gtcrn
This article is general information. Devices and services can change over time.
Frequently asked questions
Is one-click studio sound free?
Yes. No sign-up or usage limits, and files are processed on your device instead of being sent to a server.
Will it match paid services?
It applies the same kinds of processing (noise reduction, de-essing, EQ, leveling, loudness) in your browser. Results depend on the recording, so compare with the original and choose a preset.
Does it work with video files?
Yes. It processes the audio from the video. MP4 and MOV videos can be saved back as MP4 with the cleaned audio (the picture is copied, not re-encoded); other formats are saved as audio.
Can it fix distorted audio?
Audio that clipped while recording is hard to recover. Lower the input level a little next time.