Below is the site I use to change the DPI of images:

https://image.online-convert.com/convert-to-tiff

Best option you can open the old image and save the image in 300 DPI in Photoshop.

Secondlly, you can use online image conversion software

Third option is to watch the youtube video:

https://www.youtube.com/watch?v=U8v_Dz0IqvU

I suggest something slightly different but you need photoshop software.

Using photoshop you open a good quality fig (if bad quality it will not improve when you put it in 300 ppp)

Once opened with photoshop , you go to "image size" (top up in tools bat) and there is an option, you click in it and a display is opened in wich you select directly 300 ppp and the size. This image attached may help: you should click in one of the last 4 options (all are 300 ppp). Then "save as": tif without layers (no compressions are needed). In the attached fig "pulg" (4x6, 5x7 pulg..) refer to inches

Below is the site I use to change the DPI of images:

https://image.online-convert.com/convert-to-tiff

You can also use Microsoft PowerPoint . Check this video: https://www.youtube.com/watch?v=NBtPno3VFec.

https://support.microsoft.com/en-us/help/827745/how-to-change-the-export-resolution-of-a-powerpoint-slide

You can also use this site: https://convert.town/image-dpi

Hello Mohammed

This is my channel named MOMENT_ON_PROTEOMICS.

Well, as you need, I have the best answer to do so in the simplest way.. watch this video and if you like, subscribe that Channel.

https://www.youtube.com/watch?v=tbSOvUSQJIk&index=19&list=PLQLtIQhMOBQ7QVRZKtbZfw5KqNSqg6FTG

Dear Zakwan,

Try this: https://www.presentationpoint.com/blog/convert-powerpoint-to-jpeg/

I use IrfanView a free program https://www.irfanview.com/ for converting many photo . You can convert images between different formats, also batch crop, change size, set dpi, change color depth and more. From file menu chose batch conversion,rename/advanced/set new dpi and set it to 300 or more. As shewn in the following screenshots

For one Image you can use the following sequence, from file menu , open file, from image menu select resize/re-sample change dpi as you need. As shown in the following screenshots

Please see this video

How to Save Excel Graphs as High Quality Images

https://youtu.be/-NwYoayFJbs

You can directly convert plotted excel Plot/Chart from 96 dpi to 300, 600 dpi etc

By using photoshop softwear, set the saved images in 300 ddp .

Please do not trust in online conversion websites, your data / images may be stolen. Please keep away. IrfanView is good software.

i use this image converter website and it works quite well.

https://image.online-convert.com/

I dont recommend such online tools , keep away from free online conversion tools. I recommend IrfanView, it's free and having great features.

you can you use Photoshop or similar software to convert images

Hi dear Mohammad Zakwan, you can simply create 300 dpi in MS power point. First you have to change MS power point setting (see the attached video reference).Simply paste the image or graph as editable (keep source formatting and embed workbook) and save as tiff or JPEG as per your requirement. It will show 300 dpi clear image.

https://www.youtube.com/watch?v=Ds0JNhyCYwg

Dear Mohammad,

I think using the Photoshop program is the best way to set the exact DPI value on your images. First, open your 96 DPI image in Photoshop. Then go to 'Image' tab and select "Image Size" and set the resolution on 300 DPI (Pixels/Inch) and then save it.

Regards

- S. M.

Hi Mohammad,

If you are still stuck with this, I would like to share my Python code for high resolution (default: 300 dpi) conversion.

Just place the script inside the PHOTOS folder like the idea of Kristofer Lasko Kristofer Lasko . With the installation of Python 3, all you need is simply run 'python high_resolution_conversion.py'. It will automatically change the resolution of all images to 300 DPl.

Here's the link to the code: https://drive.google.com/drive/folders/1IE--yuRS3KA1oMsvTcWKokuwnKiLz9wv?usp=sharing

https://www.peernet.com/creating-high-resolution-tiff-images-for-print/

use that online link to imrove image quality@ Anh Phan

https://www.peernet.com/creating-high-resolution-tiff-images-for-print/

use that online link to imrove image quality@ Anh Phan

Go to google and type "enhance image dpi online". Upload your image it will enhance in seconds.

Use this toolbox! it work perfectly to generate high-resolution images (up to 1200 DPI) and its free. The best I've ever used!

https://www.xltoolbox.net/

I liked Volkan Yilmaz `s solution. It works perfect without installing any programs.

1. Open your picture to adobe photoshop- click image size-click width 6.5 inch and resulation (dpi) 300/400/600 you want. -click ok.

Your picture will be 300/400/600 dpi then click image- brightness and contrast- increase contrast 20 then click ok.

Yes Volkan Yilmaz `s solution works perfect..

If the original resolution is 96 changing it to 300 is not going to improve the resolution. You need to improve the resolution of the original image.

https://image.online-convert.com/convert-to-tiff

Once I uploaded a figure, I couldn't withdraw it. When I pressed the convert button, I lost my figure without getting any outcome. I wouldn't recommend using the site.