v1.2
Drag & drop an audio file, or click to select
MP3 / WAV / OGG / M4A / FLAC / WebM supported
🎬 MP4 / MOV video works too — the picture is copied untouched, only the audio is processed
Drag & drop or click to select the audio file you want to denoise. Supports MP3, WAV, OGG, and other major formats.
The AI (RNNoise) analyzes the audio and removes background noise entirely in your browser.
Switch between the original and processed audio tabs to compare.
Audio files download as MP3 (192 kbps); video files download as MP4. The picture is copied untouched — only the sound is cleaned up.
Added video support (MP4 and MOV). Load a video as it is and Shizuka cleans up only the sound, keeping the picture untouched, then writes it back out as MP4. Stereo is now processed left and right separately, and the progress display during processing has been improved.
Fixed a click/pop noise at the very end of the processed audio that occurred only when using the DPDFNet model.
No sign-up required. No usage limits. All features are free.
Audio is never uploaded to a server. All processing happens in your browser.
Detects and removes background noise in real time using the RNNoise AI model developed by Mozilla / Xiph.org.
Works on iPhone and Android browsers. No app installation needed.
Shizuka offers three AI models. Choose the one that best fits your use case.
A lightweight RNN-based model. Extremely fast, runs smoothly even on smartphones. Best for steady background noise such as air conditioning, fans, and white noise. Try this first if unsure.
A noise suppression model developed by Microsoft. Converts audio to the frequency domain via STFT and processes entire frames, handling complex noise patterns. Try this when RNNoise is not enough. Processing takes a bit longer.
A stateful model that maintains internal state across frames. Considers the context of surrounding audio, making it strong against fluctuating or sudden noise. Ideal for podcasts and narration production.
You can process the same file with multiple models and compare the results.
Remove air conditioner and keyboard noise from recordings of Zoom, Google Meet, or Microsoft Teams calls. Also helps improve transcription accuracy.
Remove background noise from recordings made at home or on the go for near-studio quality.
Remove ambient noise from interviews recorded in cafes or on the street, making the speaker's voice clear.
Remove noise from voice memos recorded on your smartphone, making them easier to listen to.
Just load a video for YouTube, TikTok or a vlog as it is, and the noise is removed from the sound while the picture stays untouched. No extracting, no re-editing — just content that is easy for viewers to follow.
Denoise before running AI transcription (e.g., Whisper) to significantly improve recognition accuracy.
Yes, it is completely free. No sign-up or login is required, and there is no usage limit.
No. Everything runs inside your browser. Neither audio nor video is ever sent to a server, so your privacy is protected.
Input supports MP3, WAV, OGG, M4A, FLAC, WebM and any audio format your browser can play. Output is MP3 (192 kbps).
It excels at background noise such as air conditioners, fans, keyboard typing, cafe and office chatter, wind, white noise and hiss. It is not suited for removing background music, reverb or echo.
Yes. You can load MP4 and MOV files directly. The picture is copied without re-encoding and only the sound is cleaned up by the AI, so the image quality is not degraded by a single byte. Note that removing noise from the picture itself (grain or speckle) is not supported.
Shizuka specializes in removing background noise. It does not restore clipping or muffled audio itself, but removing the noise layered over the voice often makes it noticeably clearer.
Noise cancelling on earphones cancels sound you hear in real time. Shizuka removes background noise from already-recorded audio files using AI — ideal for cleaning up meeting recordings or voice memos.
RNNoise is light and fast, great on phones and for steady noise. NSNet2 (by Microsoft) is balanced and handles complex noise. DPDFNet is a high-quality model that considers audio context — best for podcasts and narration.
Yes, it works directly in iPhone and Android browsers with no app to install. For long audio, keep files within about 5 minutes due to memory limits.
Shizuka (1) processes audio entirely in your browser without uploading, (2) needs no sign-up, (3) is completely free with no limits, and (4) lets you compare three AI models.
Yes. Just load the video file itself and you can download an MP4 with hiss, room noise and keyboard clatter removed. There is no need to extract the audio by hand or put it back with an editor. The picture is preserved untouched (supported: MP4 and MOV with AAC audio).
Yes. For streams and videos for YouTube or TikTok, you can load the video file as it is and clean it up. It removes air-conditioner hum, keyboard clatter and background chatter picked up by the microphone, leaving audio that is easy for viewers to follow. Audio-only files work the same way.
Your audio and video files are never sent to a server. Because the AI runs inside your browser (WebAssembly), you can clean up sensitive material such as meeting recordings and interviews with confidence.
Load major audio formats in your browser and export as MP3 (192 kbps). Works for MP3 noise removal, WAV and M4A denoising, and more — regardless of format.
Remove background noise — air conditioners, keyboards, chatter — from Zoom, Teams and Google Meet recordings, phone voice memos, and podcast or stream voice tracks to make them easier to hear.
With Chrome, Edge, Safari or Firefox it runs on Windows, Mac, iPhone and Android with no installation. Long audio is more stable on a PC.
Many noise removal services are upload-based, require accounts, or have paid plans. Shizuka is local-processing, sign-up-free and completely free — better for both privacy and cost.
If you want to remove noise from a video for free, Shizuka takes the video file as it is. Three steps: (1) choose an MP4 or MOV file, (2) pick an AI model and run it, (3) download the cleaned-up video as MP4. The video track is copied without re-encoding, so the image quality is untouched, and everything runs inside your browser. No upload, no sign-up, completely free. Note that removing noise from the picture itself (grain or speckle) is not supported.