The LEGO.com instructions service requires a set number — a 4 or 5 digit code printed on the box and booklet. If both are gone, you need a way to find the set number first, then the instructions.
Method 1: Identify the set from a photo
The fastest path. Upload a photo of the built or partially built set to LegoFinder. Once the AI matches your set, you'll get the set number and a direct link to the official instructions PDF.
This works for the vast majority of LEGO sets. See our article on how to take photos that get the best results for tips.
Method 2: Look for the number on the bricks
Some LEGO sets include the set number printed directly on a brick — usually a baseplate, a 2x2 tile, or a structural piece. Check large flat pieces first; the number is often hidden on the underside.
Method 3: Search by distinctive features
If the photo tool can't identify the set, try narrowing it down by hand:
- Note the theme (Star Wars, City, Castle, etc.) — usually obvious from minifigures or distinctive parts.
- Estimate the year range from the brick style and printing.
- Browse the matching theme on our themes page or use the year browse pages.
- Scroll through the catalogue images until you find a visual match.
Method 4: Ask the community
If you've tried everything and still can't identify the set, post it in the LegoFinder community. Photos with a description of distinctive parts get answers from other collectors.
What if you find the set but no instructions?
Once you have the set number, the official PDF should be on lego.com/service/buildinginstructions. If LEGO.com doesn't have it (most common with pre-1990 sets), check Rebrickable.com — community members upload scans of vintage instructions there.