YTConversion is a browser-based YouTube downloader and converter that allows users to save videos as MP4 files or extract audio as MP3 or WAV. The tool accepts direct links to standard YouTube videos, Shorts, playlists, or even search keywords entered into the input box. It operates entirely in the web browser without requiring account registration, software installation, or browser extensions. The service is free to use, with a fair-use rate limit of 25 conversions per minute per IP address to prevent automated scraping. Supported output formats include MP4 video in H.264 codec at resolutions up to 1080p Full HD, with 720p, 480p, and 360p options available, all pre-merged with AAC stereo audio so files play natively on phones, TVs, and computers. Audio extraction supports compressed CBR MP3 at 320, 256, or 128kbps with embedded ID3v2.3 tags, as well as uncompressed 16-bit PCM WAV at 44.1kHz. Additional features include batch playlist download mode, .SRT subtitle export, AI-generated chapter summaries, and a built-in search function. Videos up to two hours long can be converted in MP3 or MP4 format, while browser-based WAV decoding is recommended only for clips under 25 minutes due to local memory constraints. The typical workflow involves pasting a YouTube URL or typing a keyword into the search box, selecting a target format and quality, and pressing Convert Now to generate a download link. Popular videos are cached for 30 minutes, while newer or longer HD videos typically take between 8 and 18 seconds to process. The tool is compatible with desktop Chrome, Edge, Firefox, and mobile Safari on iOS 15 and later. Converted files are saved directly to the device's downloads folder, and users can generate both video and audio files in a single pass. The service does not keep permanent logs of submitted URLs, and the tool is intended for use only with content the user owns, public domain material, Creative Commons works, or content for which explicit permission has been granted.