Audio レコーダー

MP3/AAC/FLAC/WAV/OGG/M4A conversion via FFmpeg command generator with tutorial

Trim audio clips locally with fade in/out, export as WAV

Text-to-speech with adjustable speed and pitch for reading aloud

Adjust audio volume and export, supports extracting audio from video

Merge multiple audio files in sequence with configurable gap, export WAV

Validate, pretty-print or minify JSON with error line:col reporting

Merge multiple PDF files in sequence, all processed locally in browser

Generate cryptographically secure passwords with custom length and charset