I built a website that shows which LEGO parts go in which…
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I built a website that shows which LEGO parts go in which numbered bag
Hey everyone,
So I've been working on something that I think a lot of you might find useful. Whether you want to neatly store a set back into its numbered bags, check if a secondhand set is complete before buying or selling, or just get the full building experience by sorting the parts yourself. Knowing which parts go in which bag makes all the difference. That's basically why I made this.
**https://bricksperbag.com/** https://bricksperbag.com/
It's a free website that gives you the full inventory per bag for LEGO sets. You pick a set, and it shows you exactly which parts are in each numbered bag, with images, colors, and quantities.
**What you can do with it:**
\- **Browse 100+ sets, m**ostly 2025/2026 sets with 150+ pieces. I'm adding new sets every week and the goal is to eventually cover everything from the last 20 years. (or even more!) You can search by set number or name, or filter by theme.
\- **See all parts per bag**, click on any bag number and it shows you every part inside it with images and quantities. Parts are sorted by color so it's easy to visually scan through them.
\- **Check mode,** This one I'm pretty proud of. You can toggle check mode and tick off parts as you go through them. It tracks your progress with a progress bar and saves it so you can come back later. Really useful if you're checking whether a set is complete before selling or rebuilding.
\- **Download as PDF**, you can export the full bag breakdown as a PDF if you want to have it printed out or on your phone offline.
**How it works behind the scenes:** All the data comes from the official LEGO instruction PDFs. I extract the inventory, bag numbers, and part assignments from those. The part images are rendered using LeoCAD, and for some unique/decorated parts I use images from Rebrickable. Right now each set takes about 20 minutes to process because I manually verify everything to make sure it's accurate. In the future I'm working towards fully automating the pipeline, which would bring it down to just a few minutes per set from a PDF. That's when covering all sets from the last 20 years becomes realistic, at 20 minutes of manual work per set it's just not feasible yet.
The site is still in beta, but I'm sharing it now because I think it's already really useful, especially if people start requesting the most popular sets. That way the database grows with what people actually need. I'd also love to get early feedback so I can improve things before scaling up.
The site is completely free, no account needed or anything like that.
If your set isn't on there yet, you can request it here https://bricksperbag.com/request and I'll try to add it within a few days. And if you spot anything wrong for example wrong part, wrong quantity, whatever... there's a report page https://bricksperbag.com/report or a report button on every set page. Feedback really helps me improve the data.
Would love to hear what you think, and if there's anything you'd want to see added!
I hope this post is allowed!
#toys
Hey everyone,
So I've been working on something that I think a lot of you might find useful. Whether you want to neatly store a set back into its numbered bags, check if a secondhand set is complete before buying or selling, or just get the full building experience by sorting the parts yourself. Knowing which parts go in which bag makes all the difference. That's basically why I made this.
**https://bricksperbag.com/** https://bricksperbag.com/
It's a free website that gives you the full inventory per bag for LEGO sets. You pick a set, and it shows you exactly which parts are in each numbered bag, with images, colors, and quantities.
**What you can do with it:**
\- **Browse 100+ sets, m**ostly 2025/2026 sets with 150+ pieces. I'm adding new sets every week and the goal is to eventually cover everything from the last 20 years. (or even more!) You can search by set number or name, or filter by theme.
\- **See all parts per bag**, click on any bag number and it shows you every part inside it with images and quantities. Parts are sorted by color so it's easy to visually scan through them.
\- **Check mode,** This one I'm pretty proud of. You can toggle check mode and tick off parts as you go through them. It tracks your progress with a progress bar and saves it so you can come back later. Really useful if you're checking whether a set is complete before selling or rebuilding.
\- **Download as PDF**, you can export the full bag breakdown as a PDF if you want to have it printed out or on your phone offline.
**How it works behind the scenes:** All the data comes from the official LEGO instruction PDFs. I extract the inventory, bag numbers, and part assignments from those. The part images are rendered using LeoCAD, and for some unique/decorated parts I use images from Rebrickable. Right now each set takes about 20 minutes to process because I manually verify everything to make sure it's accurate. In the future I'm working towards fully automating the pipeline, which would bring it down to just a few minutes per set from a PDF. That's when covering all sets from the last 20 years becomes realistic, at 20 minutes of manual work per set it's just not feasible yet.
The site is still in beta, but I'm sharing it now because I think it's already really useful, especially if people start requesting the most popular sets. That way the database grows with what people actually need. I'd also love to get early feedback so I can improve things before scaling up.
The site is completely free, no account needed or anything like that.
If your set isn't on there yet, you can request it here https://bricksperbag.com/request and I'll try to add it within a few days. And if you spot anything wrong for example wrong part, wrong quantity, whatever... there's a report page https://bricksperbag.com/report or a report button on every set page. Feedback really helps me improve the data.
Would love to hear what you think, and if there's anything you'd want to see added!
I hope this post is allowed!
#toys
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