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Aggregate trending topics from Weibo, Zhihu, Bilibili, Douyin, Baidu
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