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Image DPI Changer

Set a JPG or PNG to 72, 150, 300 or any DPI without touching the pixels.

  • Free
  • No signup
  • Nothing uploaded
  • No watermark

or drop one here — nothing is uploaded

How to Use the Image DPI Changer Online

Image DPI Changer: before and after JPG A BEFORE IMAGE DPICHANGER JPG A AFTER

Image DPI Changer writes a new DPI into a JPG or PNG and shows what the picture will print at. Open the file, see the DPI it currently declares, pick 72, 96, 150, 200, 300 or 600 or type your own, and download a copy with that number in its header. The pixels are not touched: a JPG is patched in place, so it does not lose quality the way a re-save would. For a form that insists on 300 DPI, this is the whole job.

Writes a new DPI into a JPG or PNG and shows what the image prints at. DPI is metadata rather than a property of the pixels — changing it does not add or remove any — so it alters the physical size a printer chooses and nothing about the image itself. The header is patched in place, which is why a JPG comes back at the same size and quality it went in.

No software to install Free Works on any device

Step-by-Step Guide to Using the Image DPI Changer

  1. 1. Choose an image, or drop one in

  2. 2. Adjust the settings — the result updates as you change them

  3. 3. Download the result

    The image is never uploaded.

No .png file to hand? Download a sample Image file (253.4 KB) and try it.

Try it now

What is the Image DPI Changer?

Writes a new DPI into a JPG or PNG and shows what the image prints at. DPI is metadata rather than a property of the pixels — changing it does not add or remove any — so it alters the physical size a printer chooses and nothing about the image itself. The header is patched in place, which is why a JPG comes back at the same size and quality it went in.

JPG files

.JPG .JPEG .PNG

Set a JPG or PNG to 72, 150, 300 or any DPI without touching the pixels.

At a glance

  • Takes: JPG, JPEG, PNG, WEBP, GIF
  • Writes: The JFIF density of a JPG or the pHYs chunk of a PNG; WEBP and GIF are saved as PNG first
  • DPI choices: 72, 96, 150, 200, 300, 600, or any value you type
  • Shows: The DPI the file declares now, print size in inches and mm, pixels, megapixels, file size
  • Formula: inches = pixels ÷ DPI; mm = inches × 25.4
  • Runs: The header is rewritten on your device; nothing is uploaded

Why Use Online Image Tools?

Every website, exam form and social app wants pictures in its own size, shape and format. Resizing, compressing, cropping and converting on your own device gets a photo accepted the first time, without sending it anywhere.

“The right photo in the wrong size still gets rejected.”
  • Photos that meet size limits
  • Crops that fit each platform
  • Faster loading web pages
  • Text and watermarks added
  • Any format to any format
  • Private details stripped from photos
  • Exam photos made to rule
  • Colours picked straight from pictures

Popular Uses for Photo Editing Tools

These are the picture jobs people bring here most often.

  • Exam application photos Resize a photo and signature to the exact size and KB limit an exam form asks.
  • iPhone HEIC photos Convert HEIC pictures to JPG so they open on Windows and upload to any site.
  • Faster websites Convert product images to WebP and compress them so pages load quicker on mobile.
  • Social media posts Crop and resize a picture to fit Instagram, Facebook or a Discord profile.
  • Passport-style photos Make a passport-size ID photo, cropped to the size a form or office asks for.
  • Removing location data Strip GPS and camera details from a photo before posting it publicly.
  • Favicons for websites Turn a logo into the small icon that shows in a browser tab.
  • Collages and GIFs Put several photos into one collage or join frames into a short animated GIF.

What You Can Do with the Image DPI Changer

Accepts JPG, JPEG, PNG, WEBP, GIF

Shows what a photo is actually carrying: camera, timestamp, software and GPS coordinates

Removal rewrites the file without the tags rather than hiding them from the viewer

Why Use ToolXkit for Image DPI Changer?

Your files stay with you

Everything runs inside your browser. Nothing you open or type is uploaded to a server.

Picture Tools for Different Users

Students and job applicants

Get photos and signatures accepted by admission and recruitment forms first time.

Online sellers

Prepare product photos that look sharp and load quickly on shop pages.

Web developers

Convert images to WebP or AVIF and make favicons for new sites.

Social media users

Resize pictures for each platform and add text or borders to posts.

Bloggers

Compress and watermark images so articles stay quick and credit stays with you.

Designers

Pull colour palettes from photos and check image sizes and resolution.

Best Times to Resize or Convert an Image

Image tools help most when you are:

  • Filling in an online application
  • Uploading a photo that is too large
  • Opening iPhone pictures on Windows
  • Posting to different social apps
  • Speeding up a slow web page
  • Sharing a photo taken at home
  • Adding a watermark to your work
  • Making a favicon for a new site

Tips and Good to Know

  1. It cannot make a small picture print sharply. A 600-pixel-wide image is 2 inches at 300 DPI whatever number is written into it.

  2. A form that checks pixel size as well as DPI still needs the right pixels. Use Resize Image for that, then set the DPI here.

  3. Camera EXIF resolution tags are left as they are; the JFIF and PNG fields are what printers and most checkers read.

Frequently Asked Questions

Answers to common questions about this tool.

Do I need to install anything to use the Image DPI Changer?

No. Image DPI Changer runs entirely in your browser — there is nothing to download, no extension and no desktop program. It works the same on Windows, macOS, Linux, Android and iPhone.

Is it safe to use the Image DPI Changer online?

Safer than the usual alternative, yes. Most online tools upload your file to a server you know nothing about, where it sits until someone deletes it. Here the file never leaves your device — the processing happens in the page itself, so there is no server copy to leak, retain or sell.

Does Image DPI Changer reduce my photo’s quality?

Converting and cropping keep quality close to the original. Compressing trades a little detail for a much smaller file, and a lighter setting keeps more of it. Compare the preview with your original before saving.

Will my photo be accepted by the exam form?

The exam photo tools follow the size, dimensions and file weight given in the official notice. Always read the latest notice too, because boards sometimes change their rules between years.

Can I edit pictures with Image DPI Changer straight from my gallery?

Yes. Pick a photo from your gallery or take one with the camera, then save the result back to your phone. Everything works in the browser, so there is no app to install.

Is Image DPI Changer free with no watermark?

Yes. Use it for as many pictures as you need without an account, and each image comes back without any logo or mark from the site.

Further reading

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