Shoppers are voicing their frustration following a change that caused listings displaying inaccurate size information.
The second-hand shopping app has altered its size classifications for female and kids' apparel but did not contact all users about the change.
Many shoppers and sellers are expressing on platforms claiming that product pages now present an altered size classification compared to what was initially listed as a result of the reclassification.
The platform stated the new system was more in line with other platforms.
They have suggested members to examine their items and update the measurements by hand when needed, causing user dissatisfaction.
Previously, the sizing featured numerical and alphabetical indicators, such as S/8 or M/10.
The new system has a letter and a range like S/UK 8-10.
In some cases, the measurements have been reclassified - like an L measurement was previously a 12 but now shows as UK 16-18.
Frankie Bridger, who produces content about larger sizing, stated the update "complicates both purchasing and selling".
"Not many brands say XL is a 20-22," the way the service now categorizes.
Another user, from Glasgow, explained products she uploaded on Vinted with size 14 labels were showing in the marketplace as larger sizing 20-22.
"If buyers measuring 20-22 acquire them they're going to be very disappointed," she said.
A different user, based in Derby, stated she felt frustrated because the modification necessitated personal updates the sizing for "all her products".
"Personally, this is quite irritating, since I have chronic health issues and platform income has been essential following partial earnings loss," she said.
The app has more than 100 million users, comprising 18 million UK members.
It has become a favored option versus similar marketplaces including eBay and Depop.
This isn't the first time that an unexpected update to the app has proved unpopular: last year, Vinted reversed a change concerning shipment methods after backlash from users.
Liam Hendricks is a seasoned gambling analyst and writer with over a decade of experience covering online casinos.