If you need to double the size of both your artboard and all its contents, follow these simple steps:
Step 1: Select Everything
Press Ctrl + A (or Cmd + A on Mac) to select all objects on your artboard.
Step 2: Scale by 200%
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Press S to activate the Scale Tool.
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Click once anywhere on the canvas.
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In the pop-up window, type 200% and press Enter.
This will scale all selected objects to twice their size.
Step 3: Scale the Artboard
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Press Shift + O to activate the Artboard Tool.
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In the top control bar, find the Width and Height fields.
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To double the artboard size:
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If the current size is 297, type *2 after it → like this: 297*2
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Illustrator will automatically calculate the new value (594, in this case)
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Do the same for the height.
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Step 4 (Optional): Center the Artwork on the Artboard
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Press Ctrl + A (or Cmd + A) again to reselect everything.
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Go to the Align panel (or top bar)
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Choose:
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Align to Artboard
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Horizontal Align Center
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Vertical Align Center
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Bonus Tip: You Can Use Math in Input Fields!
Here’s a neat trick I discovered (and love!):
In Illustrator, you can enter math expressions in most size fields:
Type *2 to multiply
Type /2 to divide
Type +10 or -5 to add/subtract
Even type 10cm or 2in — and Illustrator will auto-convert to your current units
It works in artboard sizes, object dimensions, stroke widths, and more. Saves a ton of time!