Nibbo

Most online converters upload your file to a server. Nibbo doesn't. Every tool runs on your own device: video goes through your GPU with WebCodecs, and other formats go through FFmpeg compiled to WebAssembly. Video compression, trimming, GIFs, image conversion (HEIC/AVIF/WebP), background removal, PDF merge/split/compress/OCR in 25 languages, audio tools, plus JSON, JWT and hash tools. Free, no sign-up, no watermark, files up to 3 GB, 16 languages.