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Garry's Mod Workshop Collection Checker

Half your addons arrive and the rest do not? A Garry's Mod server downloads a collection one item at a time and abandons any item that takes too long, so the ones that fail are the big ones. Paste your collection and this shows every addon with its real size, which items are large enough to be the problem, and the exact config lines to mount it. Sizes come from Steam, not from a guess.

The lookup is relayed to Steam through this site (Steam's API does not answer browsers). Nothing about the collection is stored.

Want this on a real server? Supercraft hosts Garry's Mod →

Would rather the collection just mounted? Supercraft runs Garry's Mod servers where the Workshop collection is a field in the panel, addons update themselves, and 2 to 8 GB of RAM means a big collection has somewhere to load.

Frequently asked questions

Why does my Garry's Mod server not download all the Workshop addons?

The server downloads a collection item by item and gives up on an item that takes too long, so the failure is size-driven: small addons arrive and one large one does not. The log shows "Timed out!" or "Error! Failed to read the downloaded file". Splitting the biggest items out of the collection, or mounting them as fast-download content instead, is what fixes it rather than restarting.

How do I make players download my server's addons?

host_workshop_collection makes the SERVER mount the collection. It does not make clients download anything. For that each addon needs a resource.AddWorkshop line in a Lua autorun file, or the content has to come from a FastDL host. A collection that mounts fine server-side and still shows missing textures to players is almost always this.

How large can a Garry's Mod Workshop collection be?

There is no published hard limit, but the practical one is join time: everything a client must download before it can spawn. A collection over roughly 1 GB makes a first join slow enough that players leave, and individual items over about 100 MB are the ones that most often fail to download server-side.

Does the collection ID go anywhere?

The lookup is relayed through this site's server to Steam's public API, because Steam's API does not accept requests from browsers. Nothing about the collection is stored, and the results go only back to your page.

This tool: v1.8 · updated 7 Oct 2026