How do I crop a shipping label to 4×6 for a thermal printer?

Open the label PDF, press "Top half" (or drag the box around the label), and choose "4×6 in shipping label" under "Output page size". Every page is cropped the same way and placed on its own 4×6 page, turned if that makes it bigger. Print at 100% ("actual size") on the thermal printer.

Can it remove the white margins automatically?

Yes. Choose "Trim white margins". Each page is looked at on its own and cropped to the area that has something printed on it, with a small border. Blank pages are left as they are.

Is the cropped-away part deleted?

No. Like Acrobat's crop tool, cropping changes the visible area of the page; the content outside it is hidden but still in the file, and could be shown again by someone who edits the PDF. To remove text or images for privacy, use PDF Redactor instead.

Does cropping lower the quality?

No. The pages are not turned into images: text, lines and barcodes stay vector and sharp, and text stays selectable. With a paper size such as 4×6, the cropped area is scaled to fit that page, still as vectors.

No. The PDF is shown and cropped by this page in your browser and saved straight to your device. Password-protected PDFs need to be unlocked first.

Yes. Every tool is free to use, with no account and no credit card. The work runs on your device rather than on our servers, which is what keeps it free to run.

Are my files uploaded?

No. Your files are opened and processed inside your browser and are not sent to LibraTool. Some tools first download a processing engine or AI model to your browser; that download contains no data of yours.

Does it work on mobile?

Yes. It runs in current mobile browsers on iOS and Android, with nothing to install. Very large files can be slow or run out of memory on a phone, so use a computer for those.

✂️

Free Crop PDF

Crop PDF pages to a box you draw, or trim the white margins of every page automatically. Fit a shipping label onto a 4×6 in thermal label, A6, A4 or Letter. Text stays sharp and selectable; the file is not uploaded.

File size depends on your deviceFiles stay privateNo login requiredFree foreverShipping label → 4×6 inAuto-trim white marginsText stays vector

Drop a file here, or click to browse

PDF · processed on your device

or press Ctrl+V to paste from your clipboard

Browse files

Your files never leave your device. All processing happens locally in your browser.

How It Works

The page shows each page with pdf.js and lets you place a box on it. When you crop, pdf-lib sets the page boxes (MediaBox, CropBox and the others) to that area, taking the page's rotation into account, or embeds the area as a vector object on a new page of the size you picked. To trim margins it renders every page small and finds the rows and columns that contain ink.

1
Open the PDF
Drop a PDF or press "Browse files". The first page appears with a box around its printed area.
2
Set the crop
Drag the box or its corners, use a preset such as "Top half", or choose "Trim white margins" to crop every page to its own content.
3
Choose the page size
Keep the cropped size, or fit the crop onto a 4×6 in label, A6, A4 or Letter page.
4
Crop and download
Press "Crop and download PDF". The new PDF is saved to your device.

Your PDF is cropped in this browser and never uploaded.

Related Tools

✂️

Image Cropper

Crop images with drag-to-select, optional aspect ratio constraints (1:1, 16:9, 4:3, etc.), rule-of-thirds grid, and multi-format export (JPEG, PNG, WebP).

Try itFiles stay local

✂️

Video Trimmer

Cut a clip from any video by dragging start and end handles. Fast lossless trimming or frame-precise mode. Runs entirely in your browser.

Try itFiles stay local

🎚️

Audio Trimmer

Cut a clip from any audio file on an interactive waveform. Drag handles, preview the selection, add fades. Great for ringtones and podcast clips. Runs in your browser.

Try itFiles stay local

Free Crop PDF

How It Works

Related Tools

Image Cropper

Video Trimmer

Audio Trimmer

Frequently Asked Questions