Change Image DPI Online
Change image resolution (DPI) for print or web. Preview print dimensions in real-time.
How to Change Image DPI Online
Upload Your Image
Drag and drop or click to browse. SharpWebP reads the existing DPI from your image metadata and displays it alongside the current pixel dimensions and calculated print size.
Set DPI
Enter your target DPI value or choose a preset: 72 for web display, 150 for basic print, 300 for professional print, or 600 for fine art. Watch the print size preview update in real-time as you change values.
Download Updated Image
Download your image with the new DPI metadata embedded. Optionally combine with resizing to achieve your target DPI at specific print dimensions without quality loss.
Frequently Asked Questions
DPI (dots per inch) technically refers to the density of ink dots a physical printer deposits on paper. PPI (pixels per inch) refers to the density of pixels on a digital screen or within a digital image. In everyday use, the terms are used interchangeably when discussing digital image resolution. When you set "300 DPI" in SharpWebP, you are updating the PPI metadata that tells printers and design software how many pixels should span each inch when rendering the image physically.
DPI metadata determines how large each pixel appears in print. A 3000x2000 pixel image at 300 DPI prints at 10 x 6.67 inches with crisp detail. The same image at 72 DPI prints at 41.7 x 27.8 inches but with noticeably softer detail since each pixel covers more paper area. Changing DPI alone does not add or remove pixels -- it changes interpretation. For the best results, ensure your image has enough pixels to achieve at least 300 DPI at your desired print dimensions.
You have two paths. The metadata-only approach changes the DPI number without adding pixels, resulting in a smaller print at higher quality per inch. The resample approach increases pixel count alongside the DPI change -- SharpWebP uses advanced multi-pass Lanczos resampling with up to 16x supersampling to add pixels intelligently. The resample approach lets you achieve 300 DPI at a larger print size, and SharpWebP's AI-powered processing produces results far superior to basic upscaling.
72 DPI is the legacy web standard (though modern screens range from 96 to 400+ PPI). 150 DPI works well for print materials viewed at arm's length such as posters, flyers, and newspaper ads. 300 DPI is the professional standard for magazines, brochures, business cards, and photo prints. 600 DPI and above is used for fine art giclée printing, high-detail line art, and archival reproduction. SharpWebP offers one-click presets for all common values.
Changing only the DPI metadata has zero impact on file size or pixel quality. It updates a small number in the file header that instructs rendering software on print scale. The pixel data remains identical. If you choose to resample the image (change pixel dimensions along with DPI), then file size changes proportionally with the new pixel count. SharpWebP clearly distinguishes between these two modes and shows you the impact of each before you download.