Private browser-based image DPI metadata tool

Image DPI Checker & Converter

Check image DPI, pixel dimensions, megapixels, aspect ratio, and estimated print size. Change JPG or PNG DPI metadata to 300 DPI without uploading your image.

Drop image here to check DPI

Supports JPEG and PNG DPI metadata. You can also click the area or paste an image.

No file selected Ready to inspect image DPI metadata.

or Choose image or press Ctrl + V

Choose a JPEG or PNG for the most reliable DPI metadata result.

Loaded locally

Image file

-, -, -, current DPI: -

Target DPI 300 DPI

Custom DPI

Megapixels - Upload an image to calculate total pixels.

Aspect ratio - Reduced from the image width and height.

300 DPI capacity - Largest print size at 300 DPI without resampling.

Conversion support - JPEG and PNG can be rewritten locally.

DPI / print size Estimated output

72 DPI

150 DPI

300 DPI

600 DPI

Target

DPI conversion Metadata only

Before	After	Pixels	Status
-	300 DPI	Unchanged	Ready
Quality	Changing DPI metadata does not add pixels or improve detail.
Privacy	The file is read and rewritten in this browser.

Pixels unchanged Upload an image to see the exact pixel dimensions.

How it works

Upload

Select, drop, or paste an image. The file stays on your device.

Check DPI

Read stored DPI metadata and calculate practical print sizes.

Download

Save a copy with updated DPI metadata and unchanged pixels.

Image DPI guide

Why image DPI matters

Image DPI is often a stored metadata value. Real print sharpness depends on how many pixels are available for the physical size you want.

Print

For print, effective DPI is calculated from pixel dimensions divided by the intended print size.

Web

Browsers mainly care about pixel dimensions, not the stored 72 DPI or 96 DPI label.

Design

Some print shops, publishers, and upload forms require a 300 DPI tag even when pixels are unchanged.

300 DPI print size calculator

How many pixels do you need?

A 300 DPI metadata tag is useful for print workflows, but the real limit is still pixel count. Use this quick table to estimate whether your image has enough pixels for common print sizes.

Print size	Pixels needed at 300 DPI	Typical use
4 x 6 in	1200 x 1800 px	Photo prints and postcards
5 x 7 in	1500 x 2100 px	Photo prints and invitations
8 x 10 in	2400 x 3000 px	Portraits and small posters
8.5 x 11 in	2550 x 3300 px	Letter-size documents
11 x 17 in	3300 x 5100 px	Tabloid posters and spreads

DPI tools and guides

Find the right DPI workflow

Use these focused pages when you need a checker, a converter, a 300 DPI workflow, or a print-size calculation before downloading your image.

Checker Image DPI Checker Read stored DPI metadata, pixels, print size, and file details. Converter Image DPI Converter Change JPG or PNG DPI metadata without changing pixels. 300 DPI Convert Image to 300 DPI Prepare a 300 DPI tag for print shops and submission forms. JPG JPG DPI Converter Update JPEG JFIF or EXIF resolution metadata locally. PNG PNG DPI Converter Add or replace PNG pHYs density metadata in the browser. Print size 300 DPI Print Size Calculator Calculate inches and pixels for common print sizes.

Verify after download

How to check image DPI on your computer

Windows

Right-click the downloaded JPG or PNG, choose Properties, open Details, and check Horizontal resolution and Vertical resolution.

macOS Preview

Open the image in Preview, choose Tools, then Show Inspector. The DPI value appears under image information when the file contains resolution metadata.

Photoshop or design tools

Open Image Size or Document Properties. Confirm the resolution tag, then check that pixel width and height stayed unchanged.

FAQ

Image DPI questions

What is image DPI?

Image DPI is a density value stored in image metadata. It tells print or design software how many pixels should map to one inch, but it does not create new detail by itself.

Can I convert JPG or PNG to 300 DPI?

Yes. Upload a JPG or PNG, choose 300 DPI, and download a copy. The tool updates DPI metadata in the browser while keeping the same pixel dimensions.

Is 300 DPI good for printing?

300 DPI is a common print target for sharp close-viewed work. Whether your image is good enough depends on its pixel dimensions and the final print size.

Does changing DPI improve image quality?

No. Metadata-only DPI conversion changes the label, not the pixels. A sharper print usually needs more pixels or a smaller physical print size.

Are my images uploaded?

No. This page reads and rewrites supported image files in the browser. The image does not need to leave your device.

Which formats are supported?

DPI checking works best for JPEG and PNG. Metadata-only DPI conversion currently supports JPEG and PNG. Other formats can be previewed, but DPI metadata may not be reliably readable in the browser.