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How to resize a PDF.
Easily resize your PDF to fit any format, whether you’re preparing to print, share or just improve its readability.
If you’ve ever needed to change the page size of a PDF, you’re not alone. Whether you need to resize a document for printing, fit it to a specific paper size or adjust it for better readability, changing a PDF size is a common task for business professionals, students and more. In this guide, we’ll show you how to change the PDF page size quickly and efficiently.
PDFs are commonly used because they maintain formatting across different devices. However, there are times when you need to adjust the page size to match specific requirements, such as fitting to A4, Letter size or any other customised dimensions. Changing the PDF page size ensures your documents are formatted correctly and look as intended.
How to resize PDF pages.
Resizing PDF pages can be useful for a variety of reasons, whether you’re adjusting documents to meet printing requirements, standardising page dimensions or making files easier to view on different devices. This process involves changing the size of one or more pages within a PDF without altering the content itself. Here’s what you need to know about how to resize PDF pages.
Open the PDF document you want to modify with a PDF editing software like Adobe Acrobat.
Step 1: Select the page size option.
The following three steps are specific to Adobe Acrobat but should be similar to other PDF editing software.
- In Adobe Acrobat, go to File > Print
- Choose Page Size & Handling
- Select the Fit option to scale your PDF to the selected paper size or if you want a specific size, choose Customised Scale
Step 2: Adjust the PDF page size settings.
- Select one of the preset options (such as A4, Letter or Legal)
- If you need a customised size, manually input the dimensions in the width and height fields
Step 3: Apply the changes and save your file.
- Once you’ve chosen the desired page size, click Apply or OK
- Preview your document to ensure that it looks correct
- Finally, save your newly resized PDF by clicking Save As
How to resize PDF images.
If you need to adjust the size of an image within a PDF, whether to improve layout, readability or design, the process is fairly simple with the right tools.
Adobe Acrobat makes it easy to scale images without affecting the rest of your document. Here’s how to do it:
This method allows you to quickly resize images without needing to leave your PDF editing environment or use separate image software.
- Launch Adobe Acrobat and open your file.
Go to the Tools menu and choose Edit PDF to enable editing features. - Click the image you want to adjust.
Move your cursor over the image you’d like to resize. Once it’s highlighted, click to select it. - Resize by dragging the edges.
Use your mouse to drag one of the corners or edges of the image. Pull inward to make the image smaller or outward to enlarge it while maintaining proportions.
How to resize a PDF online.
If you prefer to avoid downloading software, online tools offer a quick and easy way to change PDF page size.Here are a few great options for various PDF needs:
- Crop PDF Pages. If you need to trim or resize a PDF, the crop PDF tool can help to eliminate unwanted white space or adjust margins to how you need them.
- Compress PDF. Need to resize and reduce file size? The compress PDF tool will help to make your PDFs smaller without losing quality.
- Split PDF. If you want to use only a few pages of a PDF document, use the split PDF tool to separate PDF pages into individual files.
Tips for changing PDF page sizes efficiently.
You can always create a copy of your original PDF before resizing it so you have a backup. And, if you're resizing multiple pages, make sure to adjust your settings to apply changes across all pages. Lastly, check your final document’s text, images and formatting to make sure they’re clear and properly aligned.
Discover all the ways Adobe Acrobat makes it easy to professionally edit your documents on any device.
Frequently Asked Questions.
Adobe Acrobat can handle most PDF resizing tasks. To change the page size, for example, go to File > Print, then Page Size & Handling, and select a standard size like A4, or set your own dimensions. To resize an image inside the document, open the PDF editor, select the image and drag the corners to fit.
If the file itself is too large to send, you could skip resizing and run it through Acrobat's online PDF compressor instead.
To resize a PDF page without losing quality, it's worth avoiding resampling images while you work. In Acrobat, deselect "Resample image" before changing the height or width, which helps keep the original detail intact rather than stretching or compressing it. You can also adjust the size by percentage, or hold Shift while dragging to maintain the original proportions.
If it's file size rather than page dimensions you're trying to reduce, use the online compressor or PDF Optimiser instead of resizing manually — Acrobat aims to balance file size against image and font quality automatically.
In many cases, yes — Acrobat's online tools can handle this without needing to install anything. You can drag and drop your file into the Crop PDF online tool to trim margins or adjust page dimensions in your browser. Sign-up may not be needed unless you want to save the result to the cloud, though this can vary.
Page size and file size aren't quite the same thing, so resizing on its own doesn't usually shrink a PDF by much. Cropping or scaling a page changes how it appears, while the underlying content, including embedded images, generally stays as it was.
To reduce file size specifically, you'd want to compress the PDF or resample its images, which reduces the data needed for storage. Resizing an image with resampling switched on can do both at once, adjusting the dimensions and trimming the file size together.
There are other tools available for resizing PDFs, so the best option often depends on your specific needs. Acrobat's resizing tools are built to work closely with how PDFs are structured, which can help produce consistent results, especially with complex documents that include embedded fonts, images or interactive elements.
For printing, Acrobat's Page Size & Handling settings, found under File > Print, are often the quickest route. Select Fit if you just need the page to match your printer's paper size, or Custom Scale for a specific dimension like A5. It's worth checking the preview before printing, as resizing can sometimes affect margins or cut off parts of the page.
Resizing a PDF doesn't automatically reduce its quality. Changing the page dimensions through cropping or scaling generally only affects how the document displays or prints, not the resolution of what's inside it. Image quality typically only drops if you resample the image while resizing, since that reduces the amount of data being stored.
Resizing a PDF on mobile is generally straightforward with the Acrobat mobile app. Open your PDF, tap More options, then choose Compress PDF. You can pick a compression level to help get the file to the size and quality you need.
If you're wanting to change the dimensions rather than the file size, you can also use the Crop pages tool and drag the selection handles to set the new size. For a multi-page document, switch on Apply to all pages to avoid repeating the process manually.
Acrobat Pro can handle this through the Action Wizard, found under Tools. Create a new action, add the resizing or file-size step you need, then select the files or folder you want processed. This can save you from opening each PDF individually, which is especially useful for a large batch.
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