Image Tools

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

Drop an image here

JPG, PNG, or WebP · up to 25 MB

Choose fileProcessed in this browser tab. No file upload is used.

Choose an image to start.

How it works

Three clear steps

01
Choose an image.
02
Select metadata-only or a pixel-resampling mode.
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

Operation	Pixel grid	Metadata
Metadata only	Unchanged	Writes JPEG JFIF / common EXIF density or PNG pHYs. Other metadata remains.
Resample pixels for selected size	Uses the width and height you enter	The new JPG or PNG receives the selected PPI.
Upscale pixels	Uses the requested pixel dimensions	Adds 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.