How do I check that an exported image matches the dimensions I intended?

Verify the saved export, not only the canvas or the editor’s export dialog. After exporting, locate the resulting file and open that file in an image viewer. Read its pixel width and height, then compare both values with your intended dimensions. For example, if you intended 1200 × 800 pixels, a result of 1200 × 800 matches; 1200 × 799 does not.

On a Mac, Apple’s Preview instructions say to open the saved image and click the Info button to open the Inspector, which displays information about the image [S1]. Check what dimensions the Inspector actually presents. The available information may not show pixel width and height in every format or view, so don’t assume a displayed resolution or print size is the pixel size. If you can’t find both pixel values, treat the check as incomplete rather than guessing.

Make the file identity part of the check. Before exporting, note the destination folder and the output filename. Afterward, open the file at that location, and confirm its name and, if useful, its visual contents before reading its dimensions. If your editor appends a suffix or changes the format, use the actual exported filename—not the source file’s name.

A simple record can prevent mix-ups:

• Intended: 1200 × 800 px
• Exported file: [filename]
• Location: [folder]
• Inspector/viewer shows: [width] × [height] px
• Result: match / mismatch / unable to verify

Those bracketed entries are placeholders. The example dimensions are hypothetical; replace them with your actual target. Keep the width and height in the same order when comparing, because reversing them changes the orientation.

No—not unless the information you can see explicitly gives the image’s pixel width and height. Print dimensions, screen display size, and pixel dimensions describe different things, so an inch measurement alone doesn’t confirm that the file has your intended pixel dimensions. Apple’s guidance identifies Preview’s Inspector as a way to view image information, but it does not establish that every format or Inspector view presents pixel width and height in the same way [S1].

If those two pixel values aren’t available in the viewer you’re using, try a different information view or an image application that identifies the saved file’s pixel dimensions. Then reopen the exported file and check again. Until you can read both pixel values from the exported file, record the outcome as “unable to verify,” not “match.”

Use this routine:

1. Write down the intended width and height in pixels before exporting.
2. Export, then note the actual output filename and destination.
3. Open that saved file—not just the editor document—in an image viewer.
4. Find the file’s pixel width and height. On a Mac, Preview’s Info button opens the Inspector; check the displayed image information for those pixel values [S1].
5. Compare width to width and height to height. Mark the result as match, mismatch, or unable to verify.

If the dimensions don’t match, return to the editor, check the export settings and destination, export again, and inspect the new saved file. This routine confirms the dimensions you can read; it does not establish image quality, color, or whether the image meets some other delivery requirement.