Seller Guides
Product photos, listing images and video ads for online sellers.
Do I Need a UPC Barcode to Sell Online? (2026 Guide)
Which channels require a UPC (Amazon, Walmart) and which don't (Etsy, Shopify), what GS1 charges, how Amazon's GTIN exemption works, and the risk of resold barcodes.
How to Take 360 Product Photos (2026): DIY Turntable, Frame Count and Spin Viewers
Build a cheap turntable, shoot 36 consistent frames, stitch them into a drag-to-rotate spin, and learn where 360 product photos are supported in 2026.
How to Calculate Discount Percentage (2026): Formulas, Stacked Discounts and Examples
The discount percentage formula both ways, how stacked discounts really add up, what buy-one-get-one is worth, and how deep a Black Friday sale can go before it loses money.
How to Calculate Dimensional Weight (2026): Formula, Divisors and Examples
The dimensional weight formula, each carrier's divisor after the July 2026 USPS change, rounding rules, billable weight examples with the math, and ways to pay for less air.
Cyber Monday Product Images (2026): Email, Banner and Ad Sizes, Timing and Ideas
Make Cyber Monday 2026 email headers, banners and ads: the exact sizes, when to finish them, how to show a discount honestly and how to reuse your Black Friday files.
How to Create SKU Numbers (2026): Format, Examples and Rules
A simple SKU format you can copy, examples for apparel, candles, jewelry and more, how SKUs differ from UPC barcodes, and the rules that keep inventory clean.
How to Create a Brand Kit for Your Small Business (2026, With Template)
What goes in a brand kit, how to make each part (logos, colors, fonts, photo style and voice), a template to copy, and where to keep it.
How to Convert an Image to PDF (2026): Windows, Mac, Chrome and Free Online
Step-by-step ways to turn a JPG or PNG into a PDF with Microsoft Print to PDF, Mac Preview, Chrome and Google Docs, plus how to combine and shrink multi-image PDFs.
How to Compress an Image to 50KB (2026): Free Steps for Phone and PC
Shrink any photo or scan under 50 KB: what size fits, free methods on phone and computer, and how to stop compression from blurring faces and text.
How to Compress an Image to 20KB (2026): Photos and Signatures, Free
Get a photo or signature under 20 KB for an application form: the dimensions that fit, free methods on every device and how to keep it legible.
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