In computing and internet slang, UL means to upload — the reverse of DL (download). It's been part of tech and file-sharing communities since the dial-up era, appearing on forums, FTP sites, and peer-to-peer networks where every byte of bandwidth mattered. Separately, UL also refers to Underwriters Laboratories, the US product-safety testing organization whose seal appears on electrical devices. Context tells you which one you're dealing with.
Finally finished encoding — going to UL the file tonight so everyone in the group can grab it.
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(computing) To upload.
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(US) , a product-safety testing laboratory.
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The vocabulary of software engineers, AI researchers, and anyone living in a terminal or on GitHub — from LLM to MCP, CORS to vibe coding, agentic to enshittification.
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