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Change Image DPI or PPI

Edit JPG or PNG density metadata, or resample to pixel dimensions you enter, with the differences clearly explained.

Use the tool

Prepare your file

JPG, PNG, WebP · up to 25 MB · 40 megapixels

Try it with a sample

Density test chart · 1200 × 800 PNG. These files contain no personal information.

Loading selects the sample only. Choose the settings in the worked example before processing.

Drop an image here

JPG, PNG, or WebP · up to 25 MB

Processed in this browser tab. No file upload is used.
Choose an image to start.

Change print density while keeping the same pixels

The source has a 96 PPI tag. The exported sample has a 300 PPI tag while retaining the same 1200 × 800 pixels. A pixel comparison of these two files is identical.

Input
31,541 bytes
Output
31,541 bytes
Result
1200 × 800 px

Settings: Metadata-only mode; 300 PPI; use the PNG test card.

Download input · Download measured output

Measured with this site’s processing engine in Edge 156 on 27 October 2026. These are results for this sample, not promised sizes for other files. Browser encoders can produce different byte counts. How to repeat the examples

Same 1200 × 800 pixelsIntended widthIntended height
96 PPI12.5 inchesAbout 8.33 inches
300 PPI4 inchesAbout 2.67 inches

The image does not gain detail when its density changes. If a form needs 600 × 400 pixels, a density-only edit cannot satisfy that rule; use the pixel resizer. If it needs a physical size at a stated density, use the physical size resizer.

Before you accept the download

  • Check both pixel dimensions before and after a metadata-only edit.
  • Use a viewer that exposes density metadata; a browser’s display size does not prove the PPI tag.
  • Metadata-only mode preserves other source data. It is not a metadata-removal or privacy-cleaning operation.

How it works

Three clear steps

  1. 01

    Choose an image.

  2. 02

    Select metadata-only or a pixel-resampling mode.

  3. 03

    Set the PPI and process the file; review whether pixel dimensions changed.

What this tool does

Choose between editing a density tag and resampling to entered pixel dimensions.

Accepted inputJPG, PNG, WebP · up to 25 MB · 40 megapixels
Processing locationThis browser tab
Account requiredNo
Output validationSignature, byte count, and tool constraints

How this result is produced

Metadata-only mode changes density information where the output format supports it. Resample and upscale modes instead use the pixel width and height you enter; use the physical-size resizer to calculate pixels from millimetres, centimetres, or inches.

Practical example

A 1,200 × 1,800 image remains 1,200 × 1,800 pixels when only its 72 PPI tag becomes 300 PPI; at 300 PPI those pixels describe a 4 × 6 inch print. Resampling for a different requested print size changes the pixel grid. Neither method can recover detail that the original never captured.

Read the guide to pixels, PPI, format, and file-size terms

Limits and troubleshooting

  • Metadata-only changes do not create detail.
  • WebP density metadata is not standardized in this workflow, so WebP uses resampling modes only.

If another program still reports the old density, it may be ignoring the new metadata. Use a resampling mode when the receiving workflow needs a specific pixel count, and lower the requested dimensions if the browser runs short of memory.

Questions people ask

Will setting 300 DPI improve a blurry image?

No. A metadata-only change affects how physical size may be interpreted. Upscaling adds pixels but cannot reconstruct detail that was not captured.

Pixels stay separate from the density tag

OperationPixel gridMetadata
Metadata onlyUnchangedWrites JPEG JFIF / common EXIF density or PNG pHYs. Other metadata remains.
Resample pixels for selected sizeUses the width and height you enterThe new JPG or PNG receives the selected PPI.
Upscale pixelsUses the requested pixel dimensionsAdds a larger grid, without reconstructing missing detail.

For a 50 mm print at 300 PPI, calculate 50 ÷ 25.4 × 300 = 590.55 and round to 591 pixels. The current resampling controls accept pixels; they do not read a physical size automatically from the source. Metadata-only mode keeps the source format even if another export format is selected.

Use Physical Size Resizer when you want to enter millimetres directly. Metadata-only editing retains other EXIF fields, which can include camera or location details. Choose a re-encoding workflow when metadata removal matters.