01Phase 01
Container Stream Isolation
Your browser’s Web Audio decoder reads the video container in local memory and decodes only its audio track; the video frames are ignored.
Instant Client Demuxing · Lossless WAV Master
Extract audio from video and save it as WAV
Pull crystal-clear dialogue and soundtrack audio directly from local video files with zero network latency, zero quality degradation, and complete data privacy.
Extract audio from video and save it as WAV
Ready for a local audio or video file
Local Browser Audio Engine
Scanning speech & quiet pauses…
Reading media and computing RMS energy…
1Reading file
2Decoding audio
3Scanning quiet
4Building map
Loudness:-16.0 LUFS
Peak:-1.0 dBFS
0:00 savedPacing Preset
Speech cushionsFine-tune detection parameters
Balanced
Balanced (~-38dB): Calibrated natural balance recommended for podcasts, YouTube videos, and dialogue.
0.80s
0.20s (all micro-pauses)2.50s (only long pauses)
0.32s
0.00s (flush / jump)0.80s (spacious)
Automatically removes silence before first speech and after last speech.
Pause #01✂️ Cut Proposed
00:14.2 → 00:16.8 (2.6s gap)
1.6s quiet gap; keeps 0.32s breathing room.
Tip: Press Del or Backspace to cut selected silenceR to keep
Silence Map (0)
0 silences found (0.0s dead air) · 0 will be cut, 0 kept
Target ScopeAll Clips
All edits reversible
Studio DSP & Ambience Rack
Real-Time DSP✨
1-Click Full Background Noise Removal
Removes 80Hz rumble, 50/60Hz hum, room hiss & mouth clicks
Anti-Blackout
Fills shortened silence gaps with authentic room tone synthesized from your recording, eliminating unnatural "vacuum dropouts".
Butterworth
-40 dBFS
+2.5dB Clarity
Sibilance
Cubic Spline
-1.0 dBFS
Subtitle Range Protection
Protect Intentional Sentences & Pauses
Importing your subtitle transcript locks dialogue boundaries so dramatic reflections and deliberate speech pauses inside sentences are never auto-cut.
No subtitles loaded
Hesitation Splicer (Fillers & Stutters)
Removes verbal hesitation sounds (um, uh, er, like) and repeated stutters.
0 fillers0 stutters
Merged with acoustic cuts
A/V Dual-System Sync
Drift ConformerEdit Evidence & Provenance
Manifest v1.0Total Proposals
0
Active Cuts
0
Restored Pauses
0
Protected Lines
0
Structural Export Validation:
✔ Zero server uploads (100% Client-Side)
✔ True-Peak Limiter ceiling ≤ -1.0 dBFS
✔ Duration conservation verified (Δ ≤ 5ms)
✔ 8ms anti-click zero-crossing micro-fades
Media Preflight & Capabilities
Source Format:Audio Track
Sample Rate:44.1 kHz
Channels:Stereo (2-ch)
Memory Footprint:~12 MB RAM
Local Processing:100% Client-Side
Verified Export Options:
- ✔ 16-Bit PCM WAV: Uncompressed lossless master audio.
- ✔ Audacity Labels: Drag-and-drop label track for Audacity / Reaper.
- ✔ CSV Cue Sheet: Tabular marker list with exact timestamps.
- ✔ EDL / FCPXML: Timeline cut lists: EDL for Premiere & Resolve, FCPXML for Final Cut & Resolve.
- ✔ Evidence Manifest: JSON & CSV audit trail with a CRC-32 source checksum.
Episode Show Notes
Silence #01 detected (00:04.4 → 00:05.0)
🎬Sequence Track1 clip
Pause Map & Timeline
Click / drag to scrub0:000:00
✨
✨ Cleaning Noise...Background Noise Remover
Multi-band spectral Wiener filtering & room rumble removal
Strong (75%)
0% (Off)50% (Balanced)100% (Studio Max)
Space Play/Pause · Del Trim · R Keep · J/L Jump 2sDouble-click waveform to trim
Lossless 16-Bit Master Audio & Edit Ledger Export
Rendered locally in browser memory with 8ms anti-click micro-fades. Zero server upload.
Detected from video
Chain in Studio FlowTimeline files reference your media by file name only. Final Cut Pro, DaVinci Resolve or Premiere Pro will ask you to relink the clip to the original file.
✨ Hover any tool icon to see what it does · Click to launch
100% browser-local processing · No files uploaded to any server
Acoustic Engineering Guide · Architecture
How this tool works in browser memory
How this tool decodes, analyzes, and masters your dialogue locally with zero cloud latency.
02Phase 02
Sample-Accurate Waveform Render
Generates high-density RMS waveform bars on a calibrated HiDPI canvas for instant visual inspection of vocal dialogue.
03Phase 03
One-Click Studio Export
Export the isolated audio track as an uncompressed 16-bit PCM WAV file ready for editing in any DAW or NLE.
Connected finishing workflows
Explore companion utilities for dialogue cleanup, speech pacing, and mastering.
Audio Standards & Research
Engineering guides & deep-dive workflows
Explore the acoustic principles, ITU-R loudness standards, and pacing techniques behind this tool.
MP4 Demuxing7 min read
How to Extract Audio from MP4 Videos Without Re-Encoding Generation Loss
Demuxing ISO base media files directly in the browser: unpacking AAC/PCM audio tracks from MP4 containers without lossy re-encoding.
Audio Extraction6 min read
How to Extract Audio From Video: When to Use MP3 or WAV
Direct client-side demuxing workflows: extracting uncompressed PCM audio vs compressed distribution MP3s without cloud uploads.
WAV vs MP36 min read
WAV vs MP3 for Editing Voice: When to Choose Each Format
A technical deep-dive into codec generation loss: why you must keep your master timeline in PCM WAV and only compress to MP3 for final distribution.
Frequently Asked Questions
Common Questions & Technical Clarifications
Why is browser-local extraction faster than online converters?+
Traditional converters force you to upload large multi-gigabyte video files to their cloud servers before processing. AutoSilenceCut decodes the file inside your local browser memory, so there is no upload or download wait. Decoding time depends on the length of the recording and the speed of your device.
Is my video footage private during extraction?+
Yes, 100%. AutoSilenceCut processes media with a zero-upload architecture. No video frames, audio tracks, or filenames ever leave your machine.
Can I extract audio from 4K and 1080p high-bitrate video files?+
Yes. As long as your browser can decode the container, AutoSilenceCut will isolate the full-bandwidth audio stream regardless of video resolution.
What audio sample rates are supported?+
The browser decodes the audio at your audio device’s sample rate, usually 44.1 kHz or 48 kHz, and the WAV is exported at that rate. Sources recorded at a different rate, such as 96 kHz, are resampled during decoding.
Can I open the extracted audio directly into Audacity or Premiere?+
Yes. The exported 16-bit PCM WAV format imports natively into Audacity, Adobe Premiere Pro, DaVinci Resolve, Logic Pro, and Reaper.