DPI/PPI Changer

Modify the DPI (dots per inch) or PPI (pixels per inch) resolution metadata embedded in image files without altering pixel dimensions or image quality. DPI/PPI is metadata that tells software how to interpret pixel dimensions as physical measurements—it doesn't affect how the image appears on screen, but it does affect how software calculates print sizes and how some applications validate files.

A 3000×2000 pixel image tagged at 300 DPI implies a 10×6.67 inch print at full resolution. The same pixel data tagged at 72 DPI implies 41.7×27.8 inches. This tool changes only the resolution metadata in the file header—every pixel remains identical, and visual quality is completely unaffected. The change matters only to software that reads this metadata for sizing calculations or validation checks.

Print production professionals submitting to publishers or print services that require specific DPI values (typically 300 DPI for quality printing) mark files appropriately without resampling. Photographers preparing files for stock agencies with DPI requirements meet submission standards without affecting image data. Designers working with layout software that uses DPI for sizing calculations ensure images place at intended dimensions. Users correcting images saved with incorrect or missing DPI values fix metadata without reconverting the entire file. Technical document preparers ensuring images meet specification requirements for archival or regulatory submission modify metadata as needed. Anyone encountering "resolution too low" errors from software that validates DPI metadata can correct the issue without any loss of image quality.