TwitterDown is an online tool for downloading videos from public Twitter/X posts as MP4 files. Its straightforward workflow lets users paste a post link, review the available download options, and save a suitable version to a phone, tablet, or computer. HD quality is offered when the source makes it available, and no app installation or sign-in is required. The web downloader is free for single public links; it cannot access private posts, direct messages, deleted content, or videos requiring special permissions.

For larger or automated workflows, TwitterDown also offers an API for integrations, internal tools, and media archiving. API features include JSON responses with metadata, documentation and sample code, with paid plans providing higher throughput, additional credits, and support options. Batch processing is also presented for users handling multiple public links. The service focuses on MP4 downloads, a widely supported format, and lets users choose among the qualities supplied by the public source. TwitterDown advises users to respect copyright, creator rights, and platform terms when saving or using videos.