Image DPI Converter - Change DPI/PPI for Print Use

Change Image DPI for Print or Web

Image DPI Converter lets you check and change the DPI/PPI resolution of any photo so it meets a printer's requirement or fits a web layout. Drop in a JPEG, PNG, WebP, or BMP and convert it to 300 DPI, 72 DPI, or any value you need — straight in your browser.

You get two ways to work: Change DPI Only rewrites the embedded DPI tag without touching a single pixel, while Resample Image recalculates the pixel dimensions to hit a target DPI at the same physical print size. Either way, the output dimensions and print size update live before you download.

Private by design: every image is read and converted locally with the Canvas API. Your files never leave your device — nothing is uploaded to a server.

What DPI Means

DPI (dots per inch) — often used interchangeably with PPI (pixels per inch) — sets how many dots fit into one printed inch. A higher DPI packs more detail into the same physical size for a sharper print; a lower DPI is fine for screens. The DPI tag stored in a file decides its default print size, not how it looks on a monitor.

72 DPI

Standard for web and on-screen display.

150 DPI

Suitable for draft prints, proofs, and large-format viewed from a distance.

300 DPI

The industry standard for high-quality printing.

600 DPI

Used for fine art and professional output.

How to Change an Image's DPI

Upload your image

Drop an image onto the upload zone or click to browse. JPEG, PNG, WebP, and BMP files up to 50 MB are supported.

Review the image info

See a preview plus the dimensions, format, current DPI (detected from the file, or 72 default if none is found), and the print size in centimeters and inches.

Choose a mode

Pick Change DPI Only to update just the DPI tag, or Resample Image to resize the pixels for a target print resolution.

Set the target DPI

Type any value from 1 to 9999, or tap a preset — 72 (Web), 150 (Draft), 300 (Print), or 600 (HQ). The output dimensions and print size refresh in real time.

Download the result

Click Download. JPEG images stay JPEG; every other format is saved as PNG, with the new DPI metadata embedded in the file.

Features

Automatic DPI Detection

Reads DPI from JPEG JFIF headers and EXIF data, and from PNG pHYs chunks. Falls back to 72 DPI when no metadata is found.

Two Conversion Modes

Change the DPI metadata only, or resample the pixels to match a target DPI while keeping the same physical print size.

Quick DPI Presets

One tap sets 72 (Web), 150 (Draft), 300 (Print), or 600 (HQ) — or enter any custom value from 1 to 9999.

Real-Time Output Preview

Switch modes or change the target DPI and watch the output dimensions and print size update instantly — no guesswork before you download.

Print Size Calculator

See the physical print dimensions in both centimeters and inches for any DPI, so you can tell if an image is big enough for an A4 page or a poster.

Accurate Metadata Injection

Writes proper DPI metadata into the file — JFIF density fields for JPEG, a pHYs chunk for PNG — so print and design software reads it correctly.

Broad Format Support

Upload JPEG, PNG, WebP, or BMP files up to 50 MB via drag & drop or the file browser.

Client-Side Processing

Everything runs locally in your browser with the Canvas API. No uploads, no tracking, no server round trip.

Frequently Asked Questions

How do I change an image to 300 DPI?

Upload your image, then tap the 300 (Print) preset or type 300 in the target DPI field. Use Change DPI Only to set the tag without altering pixels, or Resample Image to resize the pixels for that print resolution, then click Download.

What is the difference between DPI and PPI?

The two terms are often used interchangeably. Technically, DPI refers to the physical dots a printer lays down, while PPI refers to pixels on a screen. For a digital image, the DPI/PPI value stored in its metadata is what determines the default print size.

Does changing DPI reduce image quality?

In Change DPI Only mode the pixels are re-encoded through Canvas, which may cause a minor change for JPEG (re-saved at 95% quality) but does not add or remove pixels. In Resample mode, upscaling adds interpolated pixels (which can look softer) and downscaling removes them. For the best print, start from the highest-resolution source you have.

How do I change DPI without resizing the image?

Use Change DPI Only mode. It updates the embedded DPI tag while keeping the exact same pixel dimensions — the image looks identical on screen, but its physical print size changes to match the new DPI.

What DPI should I use for printing?

300 DPI is the standard for most print jobs, including brochures, magazines, and photo prints. For large-format prints viewed from a distance, such as posters and banners, 150 DPI is often enough. For fine art or professional output, 600 DPI may be appropriate.

Does DPI matter for screen versus print?

Screens display images by pixel count, so the DPI tag has no visible effect online — what matters for the web is the actual pixel dimensions. DPI only comes into play when an image is printed, where it sets the physical size and detail of the output.

Why does my image show "72 DPI (default)"?

It means no DPI metadata was found in your file. Many editors and cameras omit it, or it gets stripped during compression. The tool then falls back to 72 DPI, the standard screen resolution. You can set any DPI you like before downloading.