Engineer Builds Zero-Cost 9-Platform Video Downloader Using Serverless Edge Stack

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A software engineer has developed and launched SDOWNLOADER, a free video downloading tool that supports nine platforms including Twitter and Reddit, built entirely on a zero-dollar infrastructure budget. The system uses a five-layer decoupled architecture spanning Cloudflare Pages, Cloudflare Workers, Supabase PostgreSQL, a custom ARM-based transcode worker, and Backblaze B2 storage. A key technical challenge solved was Reddit's DASH streaming format, where separate audio and video streams are fetched simultaneously and multiplexed into a single HD MP4 file. The tool is designed with no popunder ads or deceptive redirects, which the developer says is possible because the serverless edge setup eliminates traditional cloud server costs. The project is currently live at sdownloader.online, with source code expected to be open-sourced after ongoing security audits and documentation are completed.

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