Change DPI Pro

DPI (Dots Per Inch) is a measurement that tells printers how many ink dots to place within a one-inch space. Higher DPI means more dots packed into each inch, resulting in sharper, more detailed prints. For screen display, 72 DPI is standard. For professional printing, 300 DPI is the industry standard because it produces prints where individual dots are invisible to the naked eye at normal viewing distances.

No, changing DPI does not add new pixels or detail to your image. DPI is purely metadata—instructions for the printer. If your image is 1000x1000 pixels at 72 DPI, changing it to 300 DPI means the printer will print it at a smaller physical size (about 3.3 inches instead of 13.9 inches) with the same number of pixels packed more tightly. To truly increase quality, you need more pixels (higher resolution source image).

300 DPI is the standard for most professional printing including: photo prints, business cards, brochures, magazines, and books. For large format printing (posters, banners viewed from a distance), 150 DPI is often acceptable. For fine art or high-end commercial work, some printers request 600 DPI. Always check with your print shop for their specific requirements.

We specifically support JPEG because it's the most common format used in photography and has a well-defined metadata structure (JFIF header) that allows reliable DPI modification. Changing DPI in PNG files requires modifying the pHYs chunk, which is more complex and can cause compatibility issues. Most print-ready photos are JPEGs, so this covers the majority of use cases.

Absolutely not. Change DPI Pro processes all images 100% locally in your web browser using JavaScript. The DPI metadata is modified directly in your browser's memory, and the file never leaves your device. This ensures complete privacy. The tool even works offline once the page has loaded.

Yes! Our Pro version supports bulk processing. Drag and drop multiple JPEG files or select them all at once. Each image will have its DPI metadata updated to your chosen value, and you can download them all with a single click. There's no limit to how many images you can process in one session.

DPI (Dots Per Inch) refers to printer output—how many ink dots are placed per inch on paper. PPI (Pixels Per Inch) refers to digital display—how many pixels are displayed per inch on screens. In practice, the terms are often used interchangeably when discussing image resolution, but technically DPI is for print and PPI is for screens.

Divide your image dimensions (in pixels) by the DPI to get the print size in inches. For example: a 3000x2000 pixel image at 300 DPI will print at 10x6.67 inches (3000÷300 × 2000÷300). The same image at 72 DPI would print at 41.7x27.8 inches but with lower quality. Use this formula: Print Size = Pixels ÷ DPI.

Most professional print software reads and respects the DPI metadata embedded in image files. However, some consumer software and web-based print services may override or ignore this setting. For best results, also specify the desired print size when placing your order, and confirm with your print shop that they'll use the file's native resolution.

If you print a 72 DPI image at its 'native' size, the printer will only place 72 dots per inch, resulting in a visibly pixelated, low-quality print where you can see individual dots or pixels. To avoid this, either: (1) change the DPI to 300 and accept a smaller print size, or (2) obtain a higher resolution source image with more pixels.

Yes! Photo book services typically require 300 DPI for best quality. Upload your JPEG photos, set DPI to 300, and download the updated files. Keep in mind that this only changes metadata—if your original photos are low resolution, they may still appear pixelated in print regardless of DPI setting.

Our tool allows DPI values from 1 to 2400. While 300 DPI is standard for most printing, some specialty applications like fine art reproduction or medical imaging may use 600-1200 DPI. Values above 1200 DPI often provide no visible improvement and just create larger file sizes.