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I have an jpeg file of 300 dpi. I need to reduce it to 200dpi. How can I do that?

Do I need any specific application or it can be done using Picasa/paint/MS picture manager, if yes how? Thanks

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For those who are confused about the difference between dpi and resolution, read The Myth of DPI. –  Dheeraj V.S. Apr 10 at 12:13

6 Answers 6

Use Paint.NET

http://www.dotpdn.com/downloads/pdn.html

Go to Image > Resize > Change its resolution (dpi)

As I said the resolution in the Paint.NET is the DPI (pixel/inch)

enter image description here

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Resolution and DPI are different things. –  AthomSfere Jun 14 '13 at 13:46
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I just re explained why I said "Resolution", you can see it on the screenshot (pixel/inch) –  eXshade Jun 14 '13 at 13:58
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Gave +1 after the update, as it is an important distinction. –  AthomSfere Jun 14 '13 at 15:08
    
Paint.NET has the right terminology. DPI is only for printing, not for display on monitors. –  Karan Jun 14 '13 at 23:09
    
I voted this answer but cannot take my upvote away. I think the best way of doing is this is software independent online. See my answer below. –  Masi Jul 23 '14 at 12:45

And I would take this one free tool: http://www.irfanview.com

To change DPI for the currently loaded image, click the "i" icon ("i" for information) on the IrfanView toolbar. Change the DPI, click OK, and save the image.

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I think the best way of doing is this is software independent and without installation processes.

  1. Google online DPI converter
  2. Click First search. For me, the first hit is online-convert.com at the time, but their URLs are time variant so google for them: dpi online-convert
  3. Select file to upload
  4. Change the value of DPI only to 200
  5. Done!
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I suggest using GIMP; it is a free image-editing solution, and it allows you to change the resolution, in pixels per inch, in both the x and y dimensions. I believe that this program can accomplish what you are looking for.

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+1 An extraordinarily powerful program that I suspect would also make tea and polish my shoes (if I knew enough of its features!) Nobody should be without it. –  pnuts Jun 14 '13 at 14:01

You can change the DPI of your jpeg image without an application using this free online tool:

convert.town/image-dpi

  1. Enter your new DPI value
  2. Upload your image.
  3. Download the adjusted image.
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Don't waste your time, images don't have a resolution (DPI) images are resolution independent

When printing tell the printer what size you wish to print the image and at what quality, then let the printer do the rest

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Some image formats store a resolution and some don't. That value is used by some applications for purposes like sizing the displayed image on the page. –  fixer1234 Jul 13 at 6:25

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