Free web tools
Calculators and converters that run right in your browser — no install. Nothing you enter is sent to our server.
🎬 Video
YouTube revenue calculatorEstimate ad revenue from your views
Bitrate calculatorRecommended bitrate for your resolution and frame rate
Video file size calculatorFile size from bitrate and length, or bitrate from a target size
Resolution & aspect ratio calculatorFind the aspect ratio, or fit a size to a ratio
SRT subtitle converterConvert SRT ↔ VTT/TXT and shift subtitle timing
Thumbnail size checkerCheck instantly if your thumbnail meets YouTube rules
🎵 Music
BPM calculatorTap to find BPM, convert BPM to note lengths (ms)
Playlist length calculatorAdd up track lengths and see how many more you need
Chord progression generatorPick a key and mood, get ready-to-use progressions
Music prompt generatorBuild English prompts for AI music generators
Lyrics length calculatorEstimate how many lyric lines a song needs and count yours