LabelFitQuick answer: Open the label PDF in this page on your phone, check that Image is selected, pick 203 dpi (or 300 dpi for a 300 dpi printer), and tap Share to printer app. Choose your Bluetooth printer's app, set the label size to match, and print. If sharing isn't offered, tap Save image and open the image from inside the printer app.
How to print a shipping label from your phone
- Save the label PDF to your phone. On iPhone, open the PDF and use Share → Save to Files. On Android it usually goes to Downloads.
- Open it here. Tap Choose label files and pick the PDF from Files or Downloads. Nothing is uploaded.
- Choose the image settings. Image is already selected on this page. Pick 4 × 6 in or 100 × 150 mm, then 203 dpi for most Bluetooth printers or 300 dpi for 300 dpi models.
- Share to the printer app. Tap Share to printer app and pick your printer's app, or save the image and open it from the app.
- Print at the same size. In the app, choose the same label size and turn off extra scaling, stretching or cropping.
Image sizes LabelFit makes
| Label size | 203 dpi | 300 dpi |
|---|---|---|
| 4 × 6 in | 812 × 1218 px | 1200 × 1800 px |
| 100 × 150 mm | 799 × 1199 px | 1181 × 1772 px |
| A6 (105 × 148 mm) | 839 × 1183 px | 1240 × 1748 px |
Each image also records its resolution, so apps that read it can print it at the right physical size. Thermal print heads have a fixed resolution, most often 203 dpi, so an image made at the printer's own resolution prints dot for dot with no resizing blur.
PNG or JPG, and pure black and white
Choose PNG unless your printer app only accepts JPG. PNG keeps barcode edges perfectly sharp. Pure black & white turns every grey pixel into black or white before saving. Thermal printers can only print black dots, so this stops the app from turning grey edges into speckled patterns, which keeps barcodes crisp.
Several labels on a phone
Pick several PDFs at once, or a PDF with several labels. When sharing, all images go to the printer app together if your phone supports it. Otherwise LabelFit saves them in one ZIP file.
Works without signal
Everything runs on your phone. After you've converted one label, LabelFit keeps working offline, which helps in a stockroom or post office queue with poor signal.
Frequently asked questions
Does it work on iPhone and Android?
Yes, in Safari, Chrome and other current mobile browsers. Sharing images straight to an app needs a browser that supports sharing files; recent iPhones and Android phones do. Otherwise use Save image.
Which dpi should I choose?
Use your printer's resolution. Most 4 × 6 desktop and Bluetooth thermal printers are 203 dpi; some are 300 dpi. If you're unsure, 203 dpi works on both.
Why not just send the PDF to the printer app?
Some apps print an A4 PDF shrunk onto the label, or crop it badly. An image that is already exactly label-sized avoids both problems.
Is the image watermarked?
No. Nothing is printed on the label. The file only carries a small Software note in its metadata.
More label guides
Last updated · Written by the MiniTools team. Printer apps differ; check your app's own help for its import options.