For online resellers

List once.
Sell everywhere.

Stop copying and pasting the same listing across 11 marketplaces. PostOnce takes your inventory and publishes it to eBay, Poshmark, Mercari, and more with a single submission.

The problem
Resellers spend hours every day manually re-entering the same item details on different platforms. One wrong copy-paste and you've got mismatched prices, wrong descriptions, or double-sold inventory. It's tedious, error-prone, and it doesn't scale.

Three steps. Every marketplace.

No browser extensions. No desktop required. Just your listings, everywhere.

01

Create your listing

Upload photos, write your description, set your price. One form captures everything every marketplace needs.

02

Choose your markets

eBay, Poshmark, Mercari, Depop, Facebook Marketplace, Etsy, and more. Select which platforms to hit.

03

Post once

One click publishes your listing everywhere. Titles and tags auto-optimize for each platform's algorithm.

Built different from the rest

No browser extension

Other tools depend on Chrome extensions that break every time a marketplace updates. PostOnce runs in the cloud. Works from any device, any browser.

No marketplace limits

Competitors cap you at 3 platforms per listing unless you pay more. PostOnce doesn't gate your reach behind add-on fees.

Instant sold sync

When an item sells on one platform, PostOnce pulls it from every other marketplace immediately. No double-selling. No manual cleanup.

AI listing optimization

What works on eBay doesn't work on Poshmark. PostOnce auto-adapts your titles, descriptions, and tags for each platform's search algorithm.

Your inventory deserves every buyer

Every hour spent re-listing is an hour not spent sourcing, pricing, or shipping. PostOnce gives you that time back.