What is 4×6 in PDF points?

4 × 6 inches is 288 × 432 points, because one PDF point is 1/72 inch. A 4x6 label page must report exactly that MediaBox.

Will the label be stretched to fill 4×6?

Not in this tool. The crop is scaled uniformly and centred, so the aspect ratio never changes, even when the crop is not exactly 4:6.

Size and scaling

Convert Shipping Labels to 4×6 PDF Online

“4×6” is a physical size, not a file format. A PDF only becomes a real 4×6 label when its page box measures 4 × 6 inches and the printer is told not to rescale it. Here is how to get both right.

Convert now: drop the PDF in, the output page is 288 × 432 pt (4 × 6 in) by construction.

Open the splitter

The numbers behind 4×6

Unit	4 × 6 in label
Inches	4 × 6
Millimetres	101.6 × 152.4
PDF points (1/72 in)	288 × 432
Pixels at 203 dpi (common thermal head)	812 × 1218
Pixels at 300 dpi	1200 × 1800

If a converted label measures 4 × 6.25 in, the printer was fed 4×6 stock but the page was built from a half-sheet ratio; if it measures 3.9 × 5.9 in, the PDF was scaled to 96% somewhere in the chain. Both are common, and both are why a “converted” label sometimes prints with a clipped bottom edge.

Two ways to convert, and why one is better

Rasterising to an image

Many free tools render the page to a bitmap and place that bitmap on a 4×6 canvas. It works, but the output resolution is fixed at whatever the tool chose — often 150 dpi. Barcodes drawn at 150 dpi with anti-aliasing can fail a scanner that expects crisp bars, and the file grows quickly.

Cropping and re-placing the original page

This tool keeps the page content as vector data and only changes the coordinate system it is drawn in: the source page is clipped to the crop rectangle and mapped onto a 288 × 432 pt page. Text stays text, bars stay bars, nothing is resampled. The output is also smaller than a rasterised version of the same label.

Scaling: the setting that ruins most conversions

Even a perfect 4×6 PDF prints wrong when the print dialog is left on “Fit to page”. The printer then scales 4×6 content up or down to whatever it thinks the paper is, and a shrunk barcode is harder to scan.

Set Scale: 100% or Actual size.
Turn Fit to page / Shrink to fit off.
Select 4 × 6 label stock in the paper list, not Letter or A4.
Check the preview: a label that does not fill the preview is being scaled.

What the converter can and cannot fix

Situation	Handled?
2 or 4 labels on a Letter or A4 sheet	Yes — split into separate 4×6 pages
Page stored with a 90°/180°/270° rotation	Yes — cropped exactly as your viewer shows it
Already-separated labels with large white margins	Yes — margins are trimmed to the printed area
A label drawn upside down inside a correct page	Rotate it with the 90° button, one label at a time
A PDF where the label artwork itself is distorted	No — the splitter never re-draws artwork, so a distorted source stays distorted
Password-protected PDFs	No — printing to a new PDF first is the reliable workaround

Is the conversion private?

Yes. The PDF is read with the browser's File API and processed in the page itself. There is no upload endpoint, no account, and no server-side copy of your label. Addresses and tracking numbers never leave the device.

Common questions

Can I get a 6×4 landscape label instead?

Yes. Set “Output page” to 6 × 4, or leave it on Auto and the tool follows the shape of the label it found.

Does the file size stay reasonable?

Yes. The original page content is embedded once and referenced by every label on that page, so splitting a 2-up sheet does not duplicate the fonts or images twice.

What if my label is 4 × 6 in but on a Letter page?

Choose “1 label per page”. The tool trims the surrounding white area and fits the label to the 4×6 page.