Beautiful size charts for every Shopify store
SmartSize is the Shopify size chart app that turns any chart into a modern, mobile-friendly size guide — for apparel, lingerie, footwear, and pet products. Free plan, no theme code.
The size guide your shoppers actually read
Most stores still bury sizing in a description image no one scrolls to. SmartSize puts a clear Size Chart button right next to the size selector and opens a modern, mobile-first guide — with measurements, how-to-measure tabs, automatic unit conversion, and international size mappings. Around 90% of merchants who add a sizing app start with a chart, because a clear size guide is the fastest way to answer “what size should I buy?” — and cut size-related returns.
Trusted by more than 5'000 Shopify stores
See what store owners say about SmartSize
Built for Shopify — find SmartSize on the Shopify App Store
SmartSize earned Shopify's Built for Shopify badge — the top-tier quality recognition for apps that meet the highest bar on storefront and admin performance, integration, and merchant experience. You can install SmartSize directly from the Shopify App Store in a couple of clicks — no theme code, no developer required.
Size charts from main dropshipping and print on demand brands
Printful
Printify
Gelato
Spocket
SheIn
Zendrop
DS
Printful
Printify
Gelato
Spocket
SheIn
Zendrop
DS
From chart image to live size guide in minutes
No spreadsheets to rebuild, no theme code to touch.
Upload your size chart
Drop in an image, a screenshot, or a spreadsheet. SmartSize's AI extracts every row and column into a structured, editable table.
Make it yours
Pick a style preset, add tabs and how-to-measure blocks, set units and international sizes. Everything matches your brand — no code, no theme edits.
Publish to your products
Assign charts by product, collection, type, vendor, or tag. A Size Chart button appears next to the size selector on every matching product.
Less manual work, thanks to AI
SmartSize turns the tedious parts of sizing into a few clicks — so you launch charts in minutes, not afternoons.
AI builds the chart for you
Drop in a screenshot or photo of an existing size chart. SmartSize's AI reads it and fills in the columns and rows automatically — ready to edit, with no retyping and no spreadsheets.
Localize every chart in a click
Activate translations and AI localizes your headings, table labels and helper text into each published storefront language. Edit anything by hand — your manual changes are protected from being overwritten.
Compose any size chart from draggable blocks
A Shopify-theme-editor experience for sizing. Drop Scale, Table, Callout, Media + Text and Divider blocks into your Size Guide and How to Measure tabs, reorder them freely, and fine-tune each one in the side panel — with a live preview as you build.
Everything you need to build a great size guide
Modern size charts that do far more than a static table — built for fast-growing Shopify stores.
Start 90% done with templates
You don't build a chart from a blank page. Pick your audience and product type and SmartSize loads a template with real sizing content already in place — then you tweak it to match your products.
- Pre-made templates by audience — men / women / kids / lingerie / pets
- Real starting content — sizes / measurements / how-to-measure guidance
- Multiple tabs in one chart (Size Guide / How to Measure / International)
- Always-visible header zone above the tabs
- A true-to-size fit scale to flag items that run small or large
On-brand by design
Match every size chart to your store without writing a line of CSS. Choose a preset or save your own, then fine-tune colors, fonts, spacing and corners until it looks like part of your theme.
- Four built-in style presets — Bold / Classic / Clean / Soft
- Save your own reusable brand preset
- Control colors / fonts / corner rounding / spacing
- Upload your own images and how-to-measure illustrations
- A dedicated mobile layout — not a shrunken desktop view
Built for global catalogs
Sell to shoppers anywhere without maintaining a chart per market. SmartSize converts units, maps international sizes, and assigns the right chart to the right products automatically.
- Automatic conversion between cm / in and kg / lbs
- International size mappings across US / EU / UK / JP and more
- Assign charts by product / collection / type / vendor / tag
- One chart
- many products — set up once and reuse everywhere
- Match condition and priority rules for overlapping products
Fast and lightweight
SmartSize installs through Shopify theme app extensions, so charts load instantly and add nothing to your store's render path — the storefront stays as fast as you built it.
- No impact on your store's loading times
- Zero theme code — install and uninstall cleanly
- Fully responsive across desktop and mobile
- Built for Shopify badge for storefront and admin quality
Built for every size-dependent product
If your shoppers ask “will this fit?”, SmartSize has a template to start from.
Apparel
Men's, women's, and kids' clothing — tops, dresses, jeans, and outerwear.
Lingerie & swimwear
Bra, underwear, and swim sizing with the right measurements and guidance.
Footwear
Length and width charts with international shoe-size conversions built in.
Pet products
Collars, harnesses, and apparel for dogs and cats — neck, chest, and back.
Tailored & formalwear
Suits, blazers, and dresses where precise measurements really matter.
Furniture & gear
Any product with dimensions — give buyers a clear, scannable spec table.
Clear sizing, fewer returns
A shopper who knows their size before checkout is far less likely to send the item back. SmartSize gives every product a clear, localized size guide — so customers buy the right size the first time, and fewer size-related questions reach your support inbox.
More than a chart? Add the AI size quiz.
Pro plans unlock an interactive quiz that gives every shopper a single answer — "Your size is M" — and remembers their measurements across visits.
Explore the size quizSize chart FAQs
What merchants ask before adding SmartSize size charts.
What is a Shopify size chart app?
Do I need to edit my theme code to add a size chart?
Can I turn an existing size chart image into a SmartSize chart?
What products can SmartSize size charts be used for?
Does SmartSize support multiple languages and units?
Is there a free plan for size charts?
Loved by thousands of Shopify brands worldwide
Fewer returns. More profit. Less hassle.
SunDaze Surf
Netherlands
I love using this app! It's great. My customers love it. I've used a few different apps like this and this is the one I decided to stick with. It works well and has everything I need. The app developers are super lovely and helped me out when I needed help with a setting that I missed while setting up. They are also super happy to receive any feedback to make the app even better, which I always appreciate. Highly recommend!
Lifestyle Travel Trading
Australia
I just started using this App. Until now I have been copying size charts from the supplier and loading as images. It is not as professional as I wanted. Smart Size Charts offers so much functionality to standardise, create individual charts for one or more products and to manage the info to sort your brand. I had one issue with edging on a chart. I mentioned it to support. Helen asked me to give her access and added some CSS code and all was perfect. Loving the App so far and really making my site look so much more professional after spending time to upgrade everything. If you are looking for a great size chart App. This is it!
Moke Apparel
New Zealand
Smart Size Chart & Size Guide has been a real game changer for our business. The process to setup charts + guides was not only extremely easy but looked absolutely amazing. The ability to change between in/cm, add measuring notes + images and the ability to clone size guides made it a very fast and accurate way to display information. Our questions were answered promptly and the team was willing to assist not matter the question. You won't regret using this APP!
LePantalon
France
I've been using SmartSize - Size Guide for a few weeks now, and I'm really impressed! It's made a huge difference for our customers by providing them with a clear and accurate size guide. This has helped reduce sizing mistakes and made our customers much happier overall.Thank you!
HTO Apparel
United States
This is the only app that allows unlimited size charts. I love how customizable the size chart are and easily to be setup. Support is really helpful as well.
SassynTall
Canada
As a new business Smart Size has been so valuable to my store. The free plan has been such a great way to assist in saving money and allowing me to grow. I'll definitely upgrade when my store is getting regular sales.
Riversun
Israel
Great App , use it from the launch start and its always upgraded since , great communication with costumer service and future improves...
Bgo & Me
Spain
La mejor app para guía de tallas. Traducida a la perfección, super fácil de integrar. Lo mejor de todo, el servicio de atención al cliente. Son rapidísimos y súper amables. Totalmente recomendable y feliz de haberlos encontrado.
Bit of Cats
Germany
The size charts are really easy to add to the store and they look super nice. I had an issue with the theme font option not showing for me, and Helen was amazing. I think this is one of the fastest and friendliest support experiences I've had. Thank you!
SunDaze Surf
Netherlands
I love using this app! It's great. My customers love it. I've used a few different apps like this and this is the one I decided to stick with. It works well and has everything I need. The app developers are super lovely and helped me out when I needed help with a setting that I missed while setting up. They are also super happy to receive any feedback to make the app even better, which I always appreciate. Highly recommend!
Lifestyle Travel Trading
Australia
I just started using this App. Until now I have been copying size charts from the supplier and loading as images. It is not as professional as I wanted. Smart Size Charts offers so much functionality to standardise, create individual charts for one or more products and to manage the info to sort your brand. I had one issue with edging on a chart. I mentioned it to support. Helen asked me to give her access and added some CSS code and all was perfect. Loving the App so far and really making my site look so much more professional after spending time to upgrade everything. If you are looking for a great size chart App. This is it!
Moke Apparel
New Zealand
Smart Size Chart & Size Guide has been a real game changer for our business. The process to setup charts + guides was not only extremely easy but looked absolutely amazing. The ability to change between in/cm, add measuring notes + images and the ability to clone size guides made it a very fast and accurate way to display information. Our questions were answered promptly and the team was willing to assist not matter the question. You won't regret using this APP!
LePantalon
France
I've been using SmartSize - Size Guide for a few weeks now, and I'm really impressed! It's made a huge difference for our customers by providing them with a clear and accurate size guide. This has helped reduce sizing mistakes and made our customers much happier overall.Thank you!
HTO Apparel
United States
This is the only app that allows unlimited size charts. I love how customizable the size chart are and easily to be setup. Support is really helpful as well.
SassynTall
Canada
As a new business Smart Size has been so valuable to my store. The free plan has been such a great way to assist in saving money and allowing me to grow. I'll definitely upgrade when my store is getting regular sales.
Riversun
Israel
Great App , use it from the launch start and its always upgraded since , great communication with costumer service and future improves...
Bgo & Me
Spain
La mejor app para guía de tallas. Traducida a la perfección, super fácil de integrar. Lo mejor de todo, el servicio de atención al cliente. Son rapidísimos y súper amables. Totalmente recomendable y feliz de haberlos encontrado.
Bit of Cats
Germany
The size charts are really easy to add to the store and they look super nice. I had an issue with the theme font option not showing for me, and Helen was amazing. I think this is one of the fastest and friendliest support experiences I've had. Thank you!