Image DPI / PPI Changer

View and change the DPI/PPI metadata of images for print-ready output without resampling.

Tested tool guide Tested browser tools Checked August 16, 2026

What Image DPI / PPI Changer does, with a checked example

Image DPI / PPI Changer reads the resolution value stored with an image and lets you replace that value while keeping the pixel grid unchanged. The new metadata changes the physical size that print and layout software may infer: pixels divided by PPI gives inches. The common surprise is that entering a higher PPI does not create detail or increase pixel dimensions. It only declares that the existing pixels should occupy fewer inches, provided the next application honors the metadata.

Worked example

A concrete input and expected output from the current implementation.

Input

Upload a 1200 x 1800 pixel image and set its resolution to 300 PPI.

Expected output

A modified image with resolution metadata set to 300 PPI and pixel dimensions still equal to 1200 x 1800. Its implied print size is 4 x 6 inches.

The dimensions reconcile because 1200 / 300 = 4 and 1800 / 300 = 6. With no resampling, the image still contains 2,160,000 pixels.

How the result is produced

Metadata-only change

Choose an image to inspect its stored density, then enter the replacement PPI value. The resulting image retains the original pixel width and height while its resolution metadata is updated. No pixel rows or columns are inserted, removed, or interpolated, so this operation changes the declared density rather than resizing the image.

Print-size relationship

The metadata connects pixel dimensions to an intended physical size. Divide each pixel dimension by its corresponding pixels-per-inch value to calculate inches. A 2400-pixel edge at 300 PPI therefore represents 8 inches. Changing that declaration to 200 PPI makes the same edge represent 12 inches, but the edge still contains exactly 2400 pixels.

Good uses

Correct the resolution tag before sending an image to a printer or publication that expects a stated PPI value, after confirming that the existing pixel dimensions are sufficient.
Change the physical size that page-layout or print software initially assigns to an image without resampling its artwork, photograph, or scan.
Inspect whether an unexpected print-size reading comes from the image's stored density metadata rather than from its actual pixel width and height.

Limits and checks

A higher PPI setting does not recover focus, reveal detail, remove compression artifacts, or make a small image equivalent to one captured with more pixels.
Applications can ignore image density metadata, substitute a default value, or scale the image independently. The declared PPI therefore does not guarantee a particular physical output size.
An image may have no usable density metadata at all. If another program reports a familiar default in that situation, the reported number may be that program's assumption rather than an embedded value.

Common questions

Will changing an image to 300 PPI improve its print quality?

No. Changing only the PPI metadata leaves every source pixel unchanged. It may cause software to place the image at a smaller physical size, which increases the number of existing pixels used per inch. Whether the result is suitable depends on the pixel dimensions, intended print size, image content, and printing process.

Are DPI and PPI the same value in this tool?

They are commonly used interchangeably when referring to an image's stored resolution, but they describe different things. PPI relates image pixels to physical inches. DPI properly refers to output-device dots, such as printer marks. Changing the image value does not configure a printer's dot resolution, screening, ink behavior, or other output settings.

References and verification

The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.