Chart Maker

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

Format convert, remux, mute, rotate, flip, reverse, speed change, watermark via FFmpeg

Convert Unix timestamps to dates, auto-detect seconds/milliseconds

Generate QR codes from text or URLs with adjustable size

Swap ID photo backgrounds: blue/white/red/transparent with tolerance

Compress JPG/PNG/WebP locally, adjustable quality and max width