Audio & Media
Voice recorder, metronome, tone generator, white noise mixer, subtitle converter, and media utilities
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(CLS Prevention Active · Zero Shift)Available Tools (12)
Speech Time Calculator & Web Teleprompter
Calculate speech run-time based on WPM/CPM and practice with an interactive auto-scrolling teleprompter.
YouTube Thumbnail Downloader (HD & 1080p)
Download original full-resolution YouTube video thumbnails in 1080p MaxRes, HQ, and MQ tiers.
Shorts & Reels & TikTok Safe Zone Preview
Preview 9:16 vertical video frames with accurate UI danger zones to ensure titles and subtitles are never blocked.
Online Voice Recorder & Audio Wave Trimmer
Record microphone audio with real-time waveform display, slice unwanted silence, and export lossless WAV files.
Tone Frequency Generator & Oscilloscope
Generate accurate sine, square, and triangle acoustic tones from 20Hz to 20kHz with real-time oscilloscope FFT.
Online Precision Metronome & Tap Tempo
Precision Web Audio metronome featuring 30-280 BPM range, multiple time signatures, tap tempo, and downbeat visualizer.
White Noise & Ambient Soundscape Mixer
Synthesize relaxing ambient soundscapes featuring procedural white noise, pink noise, rain, waves, and wind.
YouTube Timestamp Chapter Maker
Create valid YouTube description timestamp chapters and offset deep-links (?t=120s) for video navigation.
SRT ↔ WebVTT Subtitle Converter & Sync Adjuster
Cross-convert between SubRip SRT and WebVTT formats, extract pure transcripts, and adjust timecode sync offsets.
Video Bitrate & SD Card/SSD Storage Calculator
Calculate required SD card and SSD storage capacity (GB/TB), data write throughput, and recording hours across video codecs and bitrates.
Audio Delay, Distance (ms), DSP Samples & BPM Calculator
Calculate acoustic propagation delay (ms), temperature-corrected sound speed, DSP sample offsets, and BPM tempo-synced delay times.
Music Key Transposer & Chord Capo Calculator
Transpose chord progressions by semitones or guitar capo positions with instant slash chord and flat/sharp support.
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(CLS Prevention Active · Zero Shift)