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Add precise white borders to your photos for professional printing. Free online tool with exact inch/cm/mm measurements, custom per-side borders, and print-ready export at anyDPI.
Adding a white border (also known as a mat or margin) around your photos before printing is a professional technique used by photographers and galleries worldwide. Borders serve multiple purposes: they protect the image edges during handling, provide space for signatures or edition numbers, and create visual breathing room that makes the photograph stand out.
Unlike basic online tools that use percentages, PrintSizeChecker's border tool lets you define borders in exact real-world units — inches, centimeters, millimeters, or pixels. This precision is essential when you need your print to fit a specific frame size or when your print lab requires exact dimensions.
When your image aspect ratio doesn't match your print dimensions (for example, a 4:3 photo in an 8×10 frame), stretching the image distorts it and cropping loses parts of the photo. Our Image Fit option maintains the original aspect ratio and automatically calculates uneven borders to fill the remaining space — giving you a perfectly framed look without distortion or cropping.
Every file you download includes the correct DPI metadata (72, 150, 200, 300, or 600 DPI) that professional print labs require. Export as high-quality JPG with adjustable compression, or lossless PNG for maximum fidelity. The built-in quality indicator shows you the actual DPI of your output, so you'll know before you print whether your image has enough resolution for sharp results.
Like all PrintSizeChecker tools, your images are processed entirely in your browser. They are never uploaded to any server, stored in any cloud, or shared with third parties. Your photos remain on your device from upload to download, making this tool safe for sensitive or proprietary images.