01Phase 01
1. Load Audio or Video Track
Drop any audio or video recording into the local workspace. Audio decoding executes in-memory without uploading bytes to external servers.
Whisper AI · Word Timestamps
Speech to Text Online Free & Audio Transcriber
Transcribe spoken speech and audio to text in your browser using local Whisper AI. Generate word-level subtitle cues, edit dead air with sentence protection, and export WebVTT or SRT files.
Speech to Text Online Free & Audio Transcriber
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
2. Local Whisper Speech-to-Text
Run quantized Whisper speech recognition directly in browser WebAssembly to generate word-level timestamped subtitle cues.
03Phase 03
3. Edit, Protect & Export
Review detected filler words and stutters, protect conversational pauses, and export synchronized WebVTT, SRT, or Audacity label tracks.
Connected finishing workflows
Explore companion utilities for dialogue cleanup, speech pacing, and mastering.
Auto Subtitle Generator
Sync and export WebVTT and SRT subtitle tracks with automatic cut realignment.
Filler Words Remover
Detect and trim hesitation sounds and stutters with word-level precision.
Text-Based Video Editor
Edit video and audio timelines directly by selecting transcript tokens.
Audio Standards & Research
Engineering guides & deep-dive workflows
Explore the acoustic principles, ITU-R loudness standards, and pacing techniques behind this tool.
Subtitles6 min read
How to Use Imported SRT or VTT Captions to Review Spoken-Word Edits
How text-audio alignment works: importing SRT/VTT files, protecting enclosed pauses within sentences, and exporting synchronized subtitles.
Subtitle Sync7 min read
How to Keep Subtitles in Sync After Cutting Silence and Dead Air
The mathematics of cumulative cue timecode offsetting: recalculating WebVTT/SRT start and end timestamps proportionally across trimmed pause intervals.
Text-Based Editing8 min read
Text-Based Video Editing Workflow: How to Cut Video by Editing Words
How text-based timeline engines map subtitle tokens to video frame boundaries, preserve sentence structures, and export NLE timelines.
Frequently Asked Questions
Common Questions & Technical Clarifications
How to transcribe audio to text online for free?+
To transcribe audio to text online for free: 1. Drop your audio or video file into AutoSilenceCut. 2. Click Transcribe with AI to run browser-local Whisper speech recognition. 3. Review word timestamps and export W3C WebVTT (.vtt) or SubRip (.srt) subtitle files.
Does speech-to-text upload my voice recordings to cloud servers?+
No. AutoSilenceCut executes Whisper speech recognition entirely inside your browser using WebAssembly and Web Workers. Your audio recordings, transcripts, and filenames never leave your device.
What languages does the local speech-to-text engine support?+
The built-in browser-local model is optimized for English speech recognition. For other languages or existing transcripts, you can import standard .vtt or .srt subtitle files directly.
How does speech-to-text connect to silence and filler word editing?+
Transcribing audio generates word-level timestamps that automatically identify hesitation fillers (um, uh), repeated-word stutters, and bad take retakes, while locking intentional pauses inside spoken sentences.
What subtitle and text formats can I export?+
You can export synchronized WebVTT (.vtt) subtitles, SubRip (.srt) caption files, Audacity cue label tracks (.txt), or RFC-compliant CSV edit ledgers.