# Omnia Toolbox

> Free online tools for online resellers and people who ship packages from home. Every tool runs entirely in the browser: no sign-up, no uploads, no usage limits. Supported by ads.

Files (labels, photos) are processed locally on the user's device and are never uploaded to a server.

## Shipping labels

- [Vinted Label to 4x6 Converter](https://omniatoolbox.com/vinted-label-to-4x6/): Converts Vinted shipping labels into 4x6 inch (A6, 100x150 mm) PDFs for thermal label printers such as Rollo, Munbyn, Zebra, Dymo LabelWriter 4XL and Phomemo. Vinted only provides labels as full-page US Letter (US) or A4 (UK/Europe) PDFs with no option to change the size, so they print tiny, cut off or sideways on thermal printers. The tool finds the label on the page, crops it without losing quality (vector, so barcodes stay scannable) and outputs one 4x6 page per label. Works with USPS, UPS, SpeedX and other carriers; multiple labels at once; desktop and mobile.
- [Print 2 Shipping Labels per Page](https://omniatoolbox.com/print-shipping-labels-2-per-page/): Puts two 4x6 shipping labels on one US Letter (8.5x11) or A4 sheet, rotated to fit, for printing on regular home printers or half-sheet label paper (e.g. Avery 5126/8126). Accepts full-page or 4x6 label PDFs from Vinted, eBay, Poshmark, Etsy, USPS and others.
- [Dimensional Weight Calculator](https://omniatoolbox.com/dimensional-weight-calculator/): Calculates dimensional (DIM) weight and billable weight for USPS (divisor 166, only above 1 cubic foot), UPS and FedEx (divisor 139) domestic packages, in inches/pounds or centimeters/kilograms.

## Listing photos

- [Background Remover](https://omniatoolbox.com/background-remover/): Removes the background from up to 10 product photos at once using an AI model that runs in the browser (WebGPU or WebAssembly). Output with white, transparent or custom color background; download individually or as a ZIP. Free, no watermark.
- [Square Photo Resizer](https://omniatoolbox.com/photo-resizer/): Bulk-resizes up to 50 listing photos to square (1:1), 4:5 or 3:4 at 1080–2400 px, either padding with white/black edges or cropping, and compresses them to JPG. Download as a ZIP.

## Selling

- [Reseller Profit Calculator](https://omniatoolbox.com/reseller-profit-calculator/): Calculates selling fees, profit, margin and ROI for eBay, Poshmark, Vinted, Depop and Etsy (standard US seller fees, or custom fees), and compares the same sale across all platforms.

## About

- [About](https://omniatoolbox.com/about)
- [Privacy policy](https://omniatoolbox.com/privacy): Files never leave the browser. Ads are served by Google AdSense.
- Omnia Toolbox is independent and not affiliated with Vinted, eBay, Poshmark, Depop, Etsy, USPS, UPS or FedEx.