100% free, no signup
Free tools for Etsy, Amazon & Shopify sellers
Fee calculators, image resizers, shipping math and listing tools. Everything runs in your browser, so your files never leave your device.
All seller tools
12 free tools for Etsy, Amazon, eBay and Shopify sellers. Pick one and get to work, no signup needed.
Etsy Image Resizer
Resize product photos to Etsy's recommended 2000px size for crisp zoom, right in your browser. Free, no upload, no watermark.
Shopify Image Optimizer
Resize and compress product images for Shopify stores. Hit the 2048px sweet spot and cut file sizes for faster pages, all in your browser.
Amazon Image Resizer
Resize product photos to Amazon's 2000px requirement to unlock zoom on your listings. Free, browser-based, no upload.
Etsy Fee Calculator
Calculate your real Etsy profit after transaction fees, listing fees and payment processing. Free and instant.
Amazon Profit Calculator
Estimate your Amazon seller profit after referral fees. See your net and margin before you source a product.
eBay Fee Calculator
Work out your eBay profit after final value fees and per-order fees. Instant, free, no signup.
Dimensional Weight Calculator
Calculate dimensional (DIM) weight for UPS, FedEx and USPS packages. Find out whether carriers will bill you by size or actual weight.
Shipping Box Size Calculator
Find the right box size for your product. Enter product dimensions and padding to get recommended box dimensions and its dimensional weight.
Etsy Title Length Checker
Check your Etsy listing title against the 140-character limit. Live character count, repeated-word alerts and title SEO tips.
SKU Generator
Generate clean, consistent SKUs for your products. Customize prefix, attributes, separator and numbering, then copy them out.
Daraz Fee Calculator
Calculate your Daraz Pakistan profit after commission, VAT, payment fees and withholding tax. Free, instant, no signup.
Daraz Image Resizer
Resize product photos to Daraz's recommended 1024px square size with white-background-ready output. Free, in your browser, no upload.
From the blog
Practical guides on seller fees, product images, shipping costs, and listing optimization.
Etsy Image Size Guide (2026): Exact Dimensions for Listings That Rank and Sell
The exact Etsy image sizes to use in 2026, why 2000px on the longest side matters for zoom, and how to prep listing photos that turn browsers into buyers.
Oct 3, 2026 · 6 min read
Etsy Fees Explained (2026): How Much Does Etsy Really Take Per Sale?
Listing fees, transaction fees, payment processing, and offsite ads: every Etsy fee in plain English, with a worked example on a $30 sale.
Oct 2, 2026 · 7 min read
Dimensional Weight in 2026: How Carriers Calculate It (and the USPS Rule Change)
The DIM weight formula, every carrier's 2026 divisor, and the July 2026 USPS change that raised billable weight 19 percent overnight.
Oct 1, 2026 · 6 min read
The free toolkit for online sellers
Selling online means doing math all day: marketplace fees that stack up silently, image dimensions each platform requires, dimensional weight rules that punish oversized boxes, and listing titles with hard character limits. SellerKitTools collects the calculators and utilities sellers actually reach for into one fast, free site.
Start with the money: the Etsy fee calculator, Amazon profit calculator and eBay fee calculator show your true net profit and margin after each marketplace takes its cut, so you price products correctly before you list. Then get the visuals right with image resizers tuned to each platform, including Etsy's 2000px zoom threshold and Amazon's main image requirements.
Shipping tools cover the part most sellers learn the expensive way. The dimensional weight calculator reveals whether UPS, FedEx or USPS will bill your package by size instead of weight, and the box size calculator finds the smallest safe box for your product. Listing text tools round it out: an Etsy title length checker that enforces the 140-character limit and flags wasted keywords, plus a SKU generator for clean, consistent inventory codes.
Why sellers use SellerKitTools
Private by design
Image tools run entirely in your browser with the Canvas API. Your product photos are never uploaded to a server, which matters for unreleased products and supplier images.
Built for marketplaces
Every tool targets a real seller workflow: Etsy's 2000px zoom requirement, Amazon's referral fees, eBay's final value fees, carrier dimensional weight rules.
Free, no signup
No accounts, no trials, no paywalled exports. The calculators and resizers are free to use as often as you need them.
Frequently asked questions
Are SellerKitTools really free?
Yes. Every tool on the site is free to use with no signup, no trial period and no paywalled features. The tools run in your browser, so they cost almost nothing to operate.
Do you store my photos or data?
No. Image resizing and cropping happen locally in your browser. Calculator inputs are never sent anywhere. There is nothing to leak because nothing leaves your device.
How accurate are the fee calculators?
They are close estimates based on each marketplace's published US fee schedule: Etsy's 6.5% transaction fee, Amazon's 15% referral fee, eBay's 13.25% final value fee. Promotions, category exceptions and taxes can change real numbers, so confirm before finalizing prices.
Which marketplaces do the tools support?
Etsy, Amazon, eBay, Shopify and Instagram, with presets matched to each platform's published requirements, like Etsy's 2000px image zoom threshold and Amazon's 2000px main image rule.
Can I request a new tool?
The catalog is growing around seller workflows: fees, images, shipping and listing text. New tools are added regularly based on what sellers actually search for.