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4d2

4d2.org

4d2 dot org describes itself as a provider of free access to communication and collaboration services in a mixed Linux/BSD environment since 2001, focusing on technical transparency, user privacy and free speech. It states that its Lemmy, Mastodon and PeerTube services are being discontinued on December 16, 2026, and that registration for Matrix is temporarily closed.

4d2.sh

4d2.sh

4d2.sh is a minimalistic service for sharing temporary files. Users can upload a file through the page or via HTTP POST, including with curl. The maximum file size is 1024 MiB, and files are kept for at least 31 and at most 730 days depending on size. Executable files may not be uploaded, and uploads are scanned for viruses.