PDF Label Cropper

One PDF label cropper for any shipping label

Not every shipping label comes from a big marketplace. Many Indian sellers also sell through their own website, through social media, through chat orders and through courier booking platforms, and each of those routes produces a label in a slightly different PDF layout. The PDF Label Cropper on this page is for all of them. It makes no assumptions about where a label came from. You give it a PDF, it finds the printed label on every page, removes the empty paper around it and returns a new PDF in which each page is 4 inches wide and 6 inches tall by default, ready for a thermal label printer.

Use it for any courier label PDF, a label booked through your own online store, or a mixed batch from several sources that all need to become thermal-size files.

If you only sell on one marketplace, you can use the dedicated pages for Flipkart, Amazon, Meesho, Myntra, Snapdeal, GlowRoad and Ajio. They all run the same engine as this page, so the results are the same. This general page is for everything else, and for sellers who handle labels from many sources in the same day.

LabelsCropper is an independent website. It is not connected with any marketplace, courier or shipping platform, and it has no access to any account. It works only on a file that you provide.

Who uses a general PDF label cropper

The audience is wider than it first appears. Here are the groups who most often need a tool that is not tied to one marketplace.

• Owners of independent online stores. If you run a store on a website platform and book couriers through a shipping service, the label arrives as a PDF whose layout depends on the courier.
• Sellers who take orders through chat or social media. You may book a courier by hand for each order, and the courier's portal gives you a label for each one.
• Multi-channel sellers. If you sell on several platforms, you may have five different label layouts to deal with. A single tool avoids having to remember which cropper goes with which.
• Warehouse and packing teams. A team that packs for several brands can use one standard process, whatever label arrives.
• Small manufacturers and home businesses. A business with a few orders a day may not need a marketplace at all, yet still needs a clean label.

How to use the PDF Label Cropper

1. Get your PDF. Download the shipping label from the website or portal where you booked the courier. Any PDF with one label per page, or one label and some other content per page, will work.
2. Choose the file. Drag it into the upload box above, or click the box and select it. There is no fixed page-count or file-size cap. Very large PDFs depend on available browser/device memory.
3. Pick padding. Tight is 2 percent, Normal is 6 percent and Loose is 12 percent of the label size, added as white space on each side.
4. Pick the crop mode. Label only keeps the first main section of every page and leaves out a lower section when there is a clear empty gap between them. Keep everything on page crops around all printed content.
5. Wait while it works. A bar shows progress, and the tool reports when the file is ready.
6. Download and print. The 4x6 PDF is saved to your device. Check the first label and print at actual size on a 4x6 printer.

The cropping method in depth

Because this tool is meant for any layout, it is worth looking closely at how it makes decisions. The method is deliberately simple and does not depend on knowing the label design in advance.

Loading libraries only when needed

When you choose a file, the browser fetches PDF.js to read the file and jsPDF to write the output. They are loaded after you choose a file, not when the page opens. This keeps the page quick to display.

Turning each page into a picture

Each page is drawn on a hidden canvas at twice the normal PDF scale. A white background is painted first, so transparent areas of the PDF count as white rather than black.

Finding the content

The tool then scans the picture. A pixel counts as content when any of its red, green or blue values is below 242 out of 255. This threshold ignores faint paper texture and compression noise but still sees light grey lines. The scan samples every second pixel in each direction to stay fast.

Splitting the page into sections

Rows that contain content are joined into runs. Two runs belong to the same section unless the empty band between them is taller than about 3.5 percent of the page height. Sections shorter than about 8 percent of the page height are treated as stray marks and are ignored in Label only mode.

Choosing, padding and redrawing

In Label only mode, the first substantial section is chosen. In Keep everything mode, the whole content area is used. Your padding is added, and only that area is drawn again at about 1200 pixels across, close to 300 dpi at a width of 4 inches. Limiting the redraw to the chosen area keeps memory use low on phones.

Building the output

Each redrawn area is saved as a high-quality image and placed on a 4x6 inch page with a margin of 0.12 inch, scaled to fit without any stretching and centered across the width. All pages are collected into one PDF.

What the tool can and cannot do

An honest list of limits helps you decide whether the tool fits your job.

• It can crop labels from any PDF where the label is printed as dark content on a light background.
• It canThere is no fixed page-count or file-size cap. Very large PDFs depend on available browser/device memory.
• It can separate a label from a lower section such as an invoice when there is a clear empty gap.
• It cannot split one page that holds two or more labels into separate pages. Each input page produces one output page.
• It cannot read the text of a label or change its content.
• It cannot open password protected PDFs. Remove the password first.
• It cannot make a poor scan better. If the input is blurry, the output will be blurry too.
• It does not rotate pages. If your label is landscape, it is placed on the portrait page at its natural proportions, which will leave extra white space above and below.

If you often receive pages with several labels on one sheet, a good workaround is to ask the courier portal for a one-label-per-page format, which many portals offer.

Understanding the 4x6 label size

A 4x6 label is 4 inches wide and 6 inches tall. It is the most common parcel label size worldwide, which is why almost every thermal printer supports it. The table shows the same size in different units.

The 2:3 aspect ratio explains why the tool never stretches a label. A label that is wider than 2:3 is scaled until its width fills the page, and one that is taller is scaled until its height fills the page. Either way, the proportions of the label are kept.

Print settings that work with any label

• Paper size: 4 x 6 inches or 100 x 150 mm.
• Scale: Actual size or 100 percent.
• Margins: none, or the smallest your printer allows.
• Orientation: portrait.
• Quality: use the printer's native resolution. Raising it beyond the native value adds nothing.
• Darkness: start at the middle setting and adjust in small steps.
• Sensor type: if the printer has a choice between gap, black mark and continuous, pick gap for standard label rolls.

When you change the roll, run the printer's calibration. After calibration, print one label and compare it with the preview on your screen.

A workflow for sellers with many label sources

When labels come from several places, a short routine keeps them under control.

• Create one folder per day. Save every label PDF you download into it, with the source in the file name, such as the courier or channel name.
• Crop one file at a time. Each output file is named labelscropper-4x6-labels.pdf, so rename it as soon as it downloads.
• Check each file. Open the output and look at the first and last page before printing.
• Print by source. Print one source's labels, pack them, then move on to the next.
• Mark parcel groups. A coloured dot or a crate label tells the pickup agent which courier collects which group.
• Delete when finished. Labels contain personal data. Delete the files from your device once the parcels are delivered and you no longer need them.

Compared with other ways to resize labels

There are several ways to get a 4x6 label from an A4 PDF, and each has trade-offs.

Desktop PDF editors give you complete control, but you must crop each page by hand, which takes time and may need a paid licence. Print settings such as printing a selected area work for one label but are hard to repeat for a hundred. Online converters are quick, but many upload your file to a server, which is a privacy risk for labels that contain customer data. Custom scripts can automate the process, but they need technical skill and maintenance.

This tool aims at the middle ground: automatic like a script, simple like a web page and private because the work is done in your own browser.

Privacy: the file never leaves your device

Because the PDF is read and cropped by code running in your browser, we never receive it. No copy is stored, no account is linked to it and no one on our side can open it. The page does fetch two public libraries and a web font, and those requests contain no label data. For details, including advertising cookies, read the privacy policy.

Troubleshooting

• The label looks too small. Try Label only mode with Tight padding. If the page has other content without a clear gap, it cannot be separated automatically.
• The label edge is clipped. Use Loose padding.
• Only part of the label is kept. Switch to Keep everything on page.
• The output is blank or nearly blank. The source page may be empty or may contain only very faint content. Check the original PDF.
• The tool rejects the file.There is no fixed page-count or file-size cap. Very large PDFs depend on available browser/device memory.
• The engine does not load. Check your connection and any script-blocking extension.

Getting the best results from your source PDF

The quality of the output depends a great deal on the quality of the input, so a few habits at the download stage will save trouble later.

First, always download the label from the original source rather than taking a screenshot or a photo of it. A PDF contains sharp vector shapes and text that can be redrawn at any size, while a screenshot is a fixed grid of pixels that gets blurry when it is enlarged. If the only version you have is a screenshot placed inside a PDF, the cropper will still work, but the barcode can only be as sharp as the original picture.

Second, avoid opening a label PDF in one program and saving it again in another before you crop it. Each conversion step can change the page size, add margins or flatten transparency. If you can, use the file exactly as the label provider gave it to you.

Third, check the page setup at the source if the portal lets you choose. Some portals offer options such as A4, A5 or 4x6 label output, with one label per page or several. A one-label-per-page choice gives the best result with this tool. If the portal already offers a 4x6 option, you may not need to crop at all, though the cropper can still tidy the margins.

Fourth, look at the first page before you upload. If you can see that it contains the label and a large block of other text, you know in advance that Label only mode is the right choice. If you can see that the label is already tight to the edges of the page, a Loose padding setting is unlikely to be needed.

More output sizes and a separate invoice file

The default output is 4x6 inches, but the Output size menu above the upload box also offers 100 x 150 mm, A6, A5, 3 x 5 in, 4 x 4 in and a custom width and height in millimetres. If you print on an ordinary office printer, choose an A4 sheet with 2 or 4 labels and the tool arranges the labels on each sheet so you can cut them apart. The size you pick is remembered on this device.

If your PDF has the invoice printed below the label, tick the option to save the invoice part as a separate PDF. The label file downloads as usual, and a Download invoices PDF button appears with the invoice parts on A4 pages. This works in Label only mode and needs a clear empty gap between the label and the invoice. If none is found, the tool tells you.

Browsers, devices and accessibility

The tool needs a current browser with support for canvas drawing and for downloading files, which every mainstream browser provides. It has been written to work on Chrome, Edge, Firefox and Safari, on Android phones, iPhones, tablets, laptops and desktop computers. Older browsers that cannot run modern scripts may fail to load the PDF engine, in which case an update usually solves the problem.

Memory is the main limit on phones. The tool draws one page at a time and releases the memory afterwards, and it draws only the label area at the final high resolution, so most phones cope well with files of a hundred pages or so. If a very old device slows down or the browser reloads the tab, split the file into smaller parts and process them one at a time.

For people who use a keyboard or a screen reader, the upload area can be reached with the Tab key and opened with Enter or the space bar, and the status messages are announced as they change. If you find something that does not work well with your assistive technology, please tell us through the contact page so we can improve it.

Finally, the first use of the tool on a device needs an internet connection to fetch the two libraries. After that, your browser may keep them for later, but you should not rely on offline use. The label file itself is never sent over the connection at any time.