Does changing DPI affect image quality or pixel dimensions?

No. DPI metadata only tells software how large to print the image. Pixel dimensions and visual quality remain completely unchanged.

Which file formats are supported?

JPEG (.jpg, .jpeg) and PNG (.png). For JPEG the tool rewrites the JFIF APP0 density bytes; for PNG it writes/replaces the pHYs chunk.

Is my image uploaded to a server?

Never. All processing happens in your browser using the File API and ArrayBuffer. Your image data stays on your device.

DPI (dots per inch) is a metadata value that tells printers and design applications how many pixels map to one physical inch. It does not resize the image.

Why does my image viewer still show the old DPI?

Some viewers cache file metadata. Close and reopen the downloaded file, or use a metadata tool like ExifTool to verify the new DPI value.

Image DPI Changer

Name: Image DPI Changer
Availability: InStock
Author: Nham Vu

Change the DPI (dots per inch) metadata of JPEG and PNG images in your browser — no upload required.

Upload Image

Click or drag & drop a JPEG or PNG image

Target DPI

Preview & Result

No image loaded yet

How to Use

1
Upload: Click the upload area or drag & drop a JPEG or PNG file.
2
Check info: The tool shows current dimensions and detected DPI metadata.
3
Pick target DPI: Choose a preset (72, 96, 150, 300, 600) or enter a custom value.
4
Apply & Download: Click the button — the modified file downloads instantly.

Summary

Change the DPI (dots per inch) metadata of JPEG and PNG images in your browser — no upload required.

How it works

For JPEG files the tool modifies the JFIF APP0 segment bytes that store X/Y density. For PNG files it writes a new pHYs chunk with the equivalent pixels-per-meter value. Both operations happen in JavaScript via ArrayBuffer/DataView — no server involved.

Use cases

Prepare images for print by setting them to 300 DPI.
Tag web-optimized images with 72 or 96 DPI metadata.
Correct DPI metadata on scanned documents.
Batch-adjust resolution metadata before submitting to a publisher.

Frequently Asked Questions

Last updated: 2026-06-10 · Reviewed by Nham Vu