Toolkits by Role
Product research, listings, FBA fees and profit math — one toolkit for selling on Amazon.
Free online barcode generator for EAN-13, UPC, ISBN, Code 128, GS1-128, ITF-14, Code 39, Data Matrix and PDF417 with automatic check digits. Download PNG or SVG, create barcodes in bulk, or print Avery, A4 and thermal labels at true size. No watermark, free for commercial use.
Free bulk barcode generator: paste from Excel or import a CSV with one number per line, plus optional quantity and label text. Create up to 2,000 EAN, UPC, Code 128, ITF-14 or Data Matrix barcodes at once, download them as a PNG/SVG ZIP, or lay them out on Avery, A4 or thermal labels and print.
Free UPC barcode generator: enter 11 digits for an automatic check digit (or 12 to verify it) and create GS1-compliant UPC-A and UPC-E barcodes. Download PNG or SVG for packaging or print on label sheets, with notes on UPC sizes, quiet zones and getting numbers.
Free EAN-13 barcode generator: enter 12 digits to calculate the 13th check digit and create standard retail barcodes (EAN-8 too). Download vector SVG for packaging or PNG for e-commerce, with GS1 size, quiet zone and colour guidance.
Free Code 128 barcode generator for letters, digits and symbols: internal IDs, bin locations, parcels and Amazon FNSKU. GS1-128 (EAN-128) logistics labels are supported too, with Application Identifiers for SSCC, batch and expiry and automatic check digits.
Free Data Matrix generator for electronics, small parts, medical devices and industrial traceability, smaller than a QR code. GS1 DataMatrix (GTIN, batch, expiry, serial) is supported, with vector SVG for laser marking and print.
Free ITF-14 barcode generator: enter 13 digits for an automatic check digit and create GTIN-14 carton barcodes with bearer bars for outer cases and warehouse receiving, with ITF-14 print sizes and indicator-digit notes.
Free ISBN barcode generator: enter an ISBN-10 or ISBN-13, optionally with a 5-digit price add-on, and get it converted and validated as print-ready vector SVG or high-resolution PNG for the cover designer.
Free Code 39 barcode generator for upper-case letters, digits and - . $ / + %, used in industry, automotive parts, asset tags and legacy systems, with bulk creation and label printing.
Free Amazon FNSKU label generator: enter the FNSKU, product name and condition and print FBA barcode labels on Avery 5160 30-up, A4 21–65-up or 2×1 inch thermal labels. Import many SKUs with quantities and skip used labels on a partial sheet.
Calculate the twelfth UPC-A digit or validate a twelve-digit code's checksum.
Model order revenue, tax, fulfillment, fees, refunds, recovered inventory and advertising, with break-even prices and scenarios.
Free online margin calculator: enter any two of cost, price, margin, markup and gross profit and the rest are worked out, with markup-to-margin lookup tables that show why a 50% markup is only a 33.3% margin. Check prices before you quote.
Calculate break-even and target-profit CPA and ROAS using detailed order, fulfillment and refund assumptions.
Estimate a break-even cost per click from order value, pre-ad contribution and click-to-order conversion.
Calculate a reduced unit price, order total and savings from a percentage reduction.
免费 FBA 利润计算器：输入售价、产品成本、头程运费、FBA 配送费、仓储分摊、广告占比和退货率，选择销售类目，自动算出单件净利润、利润率、ROI 和盈亏平衡销量。费率默认 2026 年 10 月数据、可手动调整，结果仅供参考。
Calculate cost per thousand impressions, total cost or impressions from the other two values.
Calculate fractional and whole-unit break-even sales and revenue from fixed costs, unit price and unit variable cost.
Work out a selling price from cost and markup, price for a target margin, or the cost behind a price, with profit, multiplier, maximum discount, tax-inclusive price and a multi-stage markup chain.
Free online VAT calculator: add or remove VAT to get the net price, VAT and gross price, with standard and reduced VAT/GST rates for 75 countries including the UK, Germany, France and the rest of the EU, the Americas, Asia and the Middle East, plus invoice lines and a cross-country price comparison.
Free UK VAT calculator: add or remove VAT at the 20% standard rate, 5% reduced rate or 0% zero rate to get the net price, VAT and gross price, with invoice line totals and notes on the £135 import rule and common zero-rated goods.
Free reverse VAT calculator: enter a VAT-inclusive price and get the net price and VAT at any country's rate, for checking marketplace payouts, e-commerce pricing and invoices, with the correct formula and common mistakes.
免费美国销售税计算器：输入 5 位 ZIP 和订单金额，自动匹配州、按 2026 年 10 月州基准税率估算税额与总价。税率可手动覆盖。注意：实际税率因具体地址和地方附加税而异，结果仅供参考，下单前请核实。
