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Resize PDFs

Change the height and width of your PDF page. Select custom or preset page sizes like A4, A3, and standard letter

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How to resize a PDF online:

  1. To start, drop your PDF file or upload it from your device or your cloud storage service.
  2. Select the size of your document in the drop-down menu.
  3. If you choose custom size, you need to enter the dimensions for height and width, in inches or millimeters.
  4. Click on the Resize button.
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Did you know?

The A4 size is the most widely used
The world is split in two: those who use the US Letter (also called LS for Letter Size) paper size and those with A4. They are almost the same size, the US Letter being 215.9 x 279.4 millimeters (8,5 x 11 inches), and the A4 format 210 x 297 millimeters (8,27 x 11,69 inches). And both are standardized, with the US Letter belonging to ANSI/ASME Y14.1 and A4 to ISO 216.
If the A4 size format is adopted almost worldwide, the US Letter is used, as you can guess, in the US, but also Canada and several Central and South American countries.
Even if these two paper sizes are the most popular, there are many others available out there. We can also find a mix of both formats and many other variations, creating even more headaches when scanning or printing. For instance, Sweden, Japan, China, and India have their standards. They are either extensions to the ISO 216 or slightly different formats to adapt to their culture and printing machines.
You would think that the larger the paper is, the heavier it is? Not always! The weight of a sheet of paper also depends on the thickness and density of the paper type used. It is called grammage, as specified by ISO 536. For example, an A4 paper sheet with 160 gsm (grams per square meter) can weigh 10 grams, while an A3 sheet (bigger than A4 in size) but with a lower grammage like 75 gsm weighs only 9.38 grams. For US paper sizes, the weight is calculated in pounds (lbs) according to the basis weight of the paper type. The basis weight equals the ream (500 sheets or more) weight of the base size, hence the term basis weight.
Common printing paper types include Bond, Book, Bristol, Cover, Index, and Newsprint.
Make your papers lighter by replacing them with PDF files!
Also, don’t forget to hyper-compress them; it’s even better for the planet.
The A4 size was invented during the French Revolution
The physician and politician Lazare Carnot originally invented what became A4 format during the French Revolution in 1798. He wanted to create a paper size both easy to use and tax. The size of this paper resulted from a sheet of one square meter folded in four. The metric system had just been established.
In the interwar period, the German engineer Walter Porstmann was commissioned to develop a standard (DIN 476) to fix paper sizes. The DIN system is an old German design from the "Deutsches Institut für Normung," an institution dedicated to standardization.
In 1922, the DIN published the A-series formats thanks to Walter Porstmann's work. The A4 format is a sheet corresponding to a fraction of sheet A0, folded in four, the ratio between the long side and the short side remains constant. Thus, if you calculate the area of A0, multiplying its height by its width, you get precisely one square meter.
In 1975, this standard was adopted internationally under the name of ISO 216. Only two years later, in 1977, already more than half of the world was using A4 as their standard for letter format. It is a worldwide success. Because it is based on the metric system, ISO 216 has not been adopted by some countries. It is the case of the United States, which has remained with the inches of the imperial system. Other countries, such as Japan, Mexico, Venezuela, or the Philippines, preferred to keep their local system.