Free tool / PDF page preparation
4×6 PDF Page Converter
Prepare one or more PDF pages for a 4 × 6-inch printer. Fit a page without distorting it, or crop a measured 4 × 6 window at original scale. Everything runs in your browser.
This tool does not certify carrier acceptance or barcode readability. Prefer the original 4×6 label supplied by the shipping service. Fitting a Letter page onto one small label can shrink its barcode and make it unusable. Do not remove routing text or quiet zones.
01 / Work with a local PDF
Choose a PDF and conversion method
Supports PDF files up to 15 MB containing 1–10 pages. No account or server upload.
Your PDF is parsed locally. The processing library is loaded from a third-party CDN only after you select a file, but the PDF bytes are not sent to that CDN by this tool.
Useful for pages already close to 4×6. Larger source pages may shrink barcodes; the tool will require an extra warning confirmation.
The tool verifies the saved result's page count and 288 × 432 pt dimensions in-browser before enabling the download. Physical print and carrier compliance are not tested.
Convert a PDF page to exactly 4 × 6 inches (101.6 × 152.4 mm) using your own browser. This free tool offers two deliberately different methods: fit the entire source page inside a 4 × 6 canvas without distortion, or crop a specific 4 × 6-inch region at its original physical scale. The file remains on your device; no PDF content is uploaded to LabelFix Lab.
Which conversion method should you choose?
| Method | Best use | Important limitation |
|---|---|---|
| Fit the entire page | Resizing page geometry for proofs or documents already close to 4×6 | Letter or A4 pages may shrink text and barcodes too much for shipping |
| Crop a measured 4×6 region | Extracting an existing 4×6 document region from a larger page | The tool cannot automatically locate the required label or check what the crop removes |
The distinction matters. A PDF with a 4 × 6 shipping label located somewhere on an 8.5 × 11-inch Letter page is not the same as a PDF whose whole canvas is already 4 × 6. If you fit the entire Letter page onto 4 × 6 stock, the printed carrier barcode may become unreadably small. For live shipping, the safer approach is to obtain the original authorized 4 × 6 export from the carrier or marketplace whenever available.
How the 4×6 conversion works
After you choose a PDF, the browser reads its page dimensions using a PDF-processing library. With Fit, the entire source page is embedded as a page object into a new 288 × 432-point PDF canvas, with proportional scaling and optional 90-degree rotation for landscape sources that have no internal rotation flag. The tool does not stretch pages into a different aspect ratio.
With Crop, you enter the position of the top-left corner of the 4 × 6-inch region you want to keep, measured in inches from the source page’s top and left edges. The selected rectangle is copied at original physical scale. The result contains exactly one converted page for each supported source page. It is your responsibility to make sure this rectangle includes all required content.
On every successful output, the tool opens the new PDF again in your browser and checks that its page count matches the original and each page’s dimensions equal 288 × 432 PDF points. That verifies document geometry, not barcode compliance or physical printer output. You can then inspect the converted file in the embedded preview and save it locally.
Preparing a Letter-size shipping-label PDF
A US Letter document measures 8.5 × 11 inches (612 × 792 PDF points), while a portrait 4 × 6 label is 4 × 6 inches. If the complete label artwork appears within a rectangular 4 × 6-inch region of the Letter page, use Crop only after identifying the correct boundaries and checking that the selection includes the full barcode, quiet margins, shipping address, carrier routing information and other mandatory symbols.
If the label is not exactly 4 × 6 on the source page, a simple rectangle crop may not produce a compliant shipping label. Do not assume that any output that fits on the stock is accepted by the carrier. Return to the original shipping platform and request the correct thermal-printer format if one is available.
What the tool intentionally does not do
- It does not purchase, issue, verify or modify postage or tracking numbers.
- It does not detect or reconstruct barcodes, address blocks or carrier routing symbols.
- It does not automatically find a 4×6 label embedded somewhere on a Letter page.
- It does not support encrypted or damaged PDFs, or PDF pages whose internal rotation flag is non-zero.
- It does not upload PDFs to the site, and it does not provide server-side conversion.
- It does not guarantee that a printer can physically print edge-to-edge on 4-inch-wide stock.
Privacy and browser compatibility
Your selected PDF is processed in local browser memory. After you select a file, the page loads the PDF processing library from a third-party content delivery network; the application itself does not send PDF bytes there. The converted PDF is offered as a temporary browser download. Public websites and browser add-ons can behave differently, so do not assume that any website provides stronger privacy than your own device or approved workplace tools.
The tool supports PDFs up to 15 MB containing 1–10 pages. A browser with limited memory, a restricted network or an unsupported document may fail. If the library cannot load, no conversion is performed. Some PDF viewers open files instead of saving them automatically; use your browser’s save command if necessary.
How to check a converted document before printing
- Inspect each output page in the preview for clipped text or barcode bars.
- Confirm the page dimensions are reported as 4 × 6 inches.
- Check the actual physical stock width, height, pitch and printable area of your printer.
- Use an approved 4 × 6 sample document first if the device is unfamiliar.
- For live carrier labels, follow official shipping-platform instructions and verify the required symbols with the accepted shipping process before use.
Frequently asked questions
Is 4×6 in PDF points 288×432?
Yes. The standard PDF coordinate system uses 72 points per inch, so 4 × 6 inches equals 288 × 432 points exactly.
Will fitting an A4 PDF to 4×6 preserve barcode readability?
Not necessarily. The tool preserves aspect ratio but may reduce bar widths, quiet zones and text to an unusable physical size. Use a native thermal-label export for live postage whenever available.
Is cropping a Letter PDF better than fitting it?
Cropping an already-correct 4 × 6 region at 1:1 scale avoids shrinking the selected artwork, but it can also remove required content if the coordinates are wrong. The output needs careful visual and operational verification.
Does the tool work on a PDF with several pages?
Yes, for 1–10 compatible pages. The same chosen method and crop offsets are used on each page, which may not be appropriate for documents whose label locations vary.
Can I convert a USPS, eBay or Shopify shipping label?
You can prepare a locally supplied PDF page, but this tool does not authenticate the label or guarantee carrier acceptance. When the shipping service offers a native 4 × 6 format, that original is generally the preferred source.
Related tools and troubleshooting guides
- Check PDF page dimensions before converting
- Download a free, non-postage 4×6 printer test PDF
- Why shipping labels print too small
- Multiple shipping labels on one PDF page
- Barcode does not scan after printing
Editorial limitation: This is a page-geometry preparation tool. A measured 4 × 6 PDF output is not evidence of carrier compliance. Always follow the shipping issuer’s latest instructions for real postage and labels.