You don't need expensive software to run a reselling business. The best eBay tools for sellers, Poshmark seller tools, and cross-platform utilities are either completely free or have free tiers generous enough to get real work done.
This list only includes tools that are genuinely useful at $0. No "free trials that expire in 7 days" or "free plans limited to 1 listing per month." Every tool here earns its spot.
Pricing & Research
Knowing what something sells for — before you buy it to resell — is the single most valuable skill in this business. These tools make it easy.
eBay Terapeak
The best free eBay research tool, and it's built right into Seller Hub. Terapeak gives you up to three years of eBay sales data: average sold prices, Best Offer accepted prices, sell-through rates, and seasonal trends. Unlike third-party tools, it pulls directly from eBay's database, so you see data that other tools can't access — including what buyers actually paid on Best Offer listings, not just the asking price.
Free for all registered eBay sellers. No limitations.
Use it at: ebay.com/sh/research
eBay Completed Listings
Before Terapeak, there was the completed listings filter — and it's still useful for quick price checks. Search for any item on eBay, filter by "Sold Items," and see what it actually sold for in the last 90 days. Green prices mean sold; red means it didn't sell. No additional software needed.
Free for anyone on eBay.
Google Lens
Point your phone camera at any item and Google Lens identifies it, finds comparable listings, and surfaces keywords you might not have thought of. It's roughly 10 times more useful than a barcode scanner for used clothing, vintage items, and home decor where there's no barcode to scan.
Free with no limits. Built into the Google app on your phone.
Cross-Listing
If you sell on more than one platform, a cross-lister saves hours of duplicating listings by hand. The free options have gotten significantly better.
Closo
The most feature-rich free cross-listing tool available. List items across eBay, Poshmark, Mercari, Depop, and more with one-click crossposting. Includes real-time inventory sync, AI pricing suggestions, and automatic delisting when items sell. The core crosslisting features are genuinely free with no strict listing limits.
Cloud-based, so it works from any browser including mobile.
Use it at: closo.co
Vendoo
Supports the most marketplaces of any crosslister — 11 platforms including eBay, Poshmark, Mercari, Depop, Etsy, Grailed, and Vinted. The catch: the free plan limits you to 5 listings per month on 3 marketplaces, which is essentially a trial. Worth testing to see if crosslisting fits your workflow before committing to a paid plan ($8.99/month and up).
Use it at: vendoo.co
Shipping
Shipping is where hidden costs eat into your margins. These tools fix that.
Pirate Ship
The most recommended shipping tool in the reselling community, and it's genuinely 100% free — no subscription, no hidden fees, no minimum volume. You only pay for the postage itself. Pirate Ship gets you commercial USPS and UPS rates that individuals can't access on their own, saving up to 87% compared to retail prices. It also unlocks Priority Mail Cubic pricing, which saves up to 40% on small, heavy items.
Integrates with eBay, Etsy, and Shopify for automatic order importing.
Use it at: pirateship.com
eBay Shipping Labels
If you sell primarily on eBay, you might not need Pirate Ship at all. eBay offers discounted USPS and UPS labels directly through Seller Hub with rates that are competitive with Pirate Ship. Tracking uploads automatically. No extra tool needed.
Built into the eBay selling flow at no additional cost.
Photo Editing
Good photos sell items. You don't need Photoshop to take good listing photos.
Photoroom
AI-powered photo editor built specifically for product listing photos. One tap removes the background, adds a clean white backdrop, and even generates natural-looking shadows. Much faster than generic photo editors for the repetitive workflow of listing 10 items a day.
The free plan includes a watermark and lower-resolution exports. Good enough for casual sellers; the Pro plan ($12.99/month) removes the watermark.
Use it at: photoroom.com
Your Phone's Built-in Editor
Both iPhone (iOS Photos) and Android (Google Photos) now include free background removal, cropping, brightness adjustment, and filters. Zero friction — no app to download, no account to create. For most resellers listing a few items a week, this is all you need.
GIMP
If you want full Photoshop-level editing without the Photoshop price tag, GIMP is the answer. It's free, open-source, and has no limitations. The learning curve is steeper, but the power is unlimited — layers, masks, batch processing, color correction, everything. Best for resellers who want to create branded listing templates or do advanced editing.
Use it at: gimp.org
Poshmark-Specific Tools
Poshmark's algorithm rewards activity — specifically sharing. These tools automate the most time-consuming part of selling on Poshmark.
Closo Poshmark Sharer
Cloud-based Poshmark sharing automation. Shares your closet to followers and Posh Parties automatically, sends offers to likers, and reposts stale listings. Because it's cloud-based, it runs without keeping your phone screen on or a browser tab open.
Free with no upfront costs.
Use it at: closo.co
SellerAider
Free Poshmark automation that also works with Vinted and Depop. Includes sharing, relisting, sending offers, auto-responses, and following. One of the few tools offering free automation across three platforms.
Use it at: selleraider.com
eBay-Specific Tools
Beyond Terapeak and Seller Hub (covered above), a few more free eBay seller tools are worth knowing about.
eBay Seller Hub
The command center for your eBay business. Manage listings, view sales analytics, track which items get views and watchers, monitor performance metrics, and handle returns. All free, all built in. If you're selling on eBay and not using Seller Hub, you're missing the most important eBay tool for sellers there is.
Use it at: ebay.com/sh/overview
Fee Calculators
Know your actual profit before you list. Several free calculators account for category-specific eBay fees, store tiers, and promoted listing costs:
- Vendoo eBay Fee Calculator — accounts for store subscriptions and Top Rated Seller discounts
- 3Dsellers Fee Calculator — clean interface, covers all fee types
- SellerAider Poshmark Fee Calculator — for Poshmark-specific calculations
All free, no signup required.
Dewiso
Free eBay listing template editor. Creates mobile-responsive, policy-compliant listing designs without HTML knowledge. Since most eBay browsing happens on phones, a mobile-optimized template can meaningfully improve your conversion rate.
Use it at: dewiso.com
Inventory & Bookkeeping
Google Sheets
The starting point for most resellers' bookkeeping. Track purchases, sales, fees, shipping costs, and net profit in a customizable spreadsheet. Free reseller-specific templates are widely available — search for "reseller bookkeeping spreadsheet" and you'll find plenty. Works for any selling platform and scales until you hit roughly 100+ active listings, at which point a dedicated tool starts making sense.
Free with no limits.
Sortly
Visual inventory management with barcode and QR scanning, photo organization, and real-time tracking. The free plan allows up to 100 entries with one user — enough for a small to mid-size operation.
Use it at: sortly.com
Username & Branding
Username Inspector
Before you sign up on any platform, check if your desired username is available across eBay, Poshmark, Depop, Etsy, Grailed, Vinted, and Mercari at the same time. Unlike general online username checkers like Namechk that focus on social media, Username Inspector is built specifically for reselling platforms. Free, no signup required, and runs entirely in your browser.
Use it at: usernameinspector.com
What You Actually Need
You don't need all of these tools. Here's what matters at each stage:
Just starting out:
- eBay completed listings (pricing research)
- Your phone's camera and built-in editor (photos)
- Google Sheets (inventory and bookkeeping)
- Username Inspector (grab your name on every platform)
Selling on 2-3 platforms:
- eBay Terapeak (deeper research)
- Pirate Ship (cheaper shipping)
- Closo or Vendoo (crosslisting)
- Photoroom (faster photo editing)
Scaling up:
- eBay Seller Hub analytics (data-driven decisions)
- Poshmark sharing tools (if selling on Poshmark)
- Fee calculators (know your margins on every listing)
- Dedicated inventory management
The best tool is the one you actually use. Start with the free basics, add more as your business grows, and don't pay for anything until the free version stops being enough.
For more on getting started, see our guide to how to start selling on every major reselling platform.