Photoshop file becomes a large file just after creating a layer

The size of a Photoshop image is its canvas size in Pixels. Photoshop is a Pixel editor.  Pixels have no physical size till you specify Print resolution that specifies how many pixels are printed per unit of measurement like Pixels per inch, pixels per centimeter, etc.   Resolution is meaningless when it come to your display.  Displays  have a fixed size pixel and are manufactured with  a fixed number of pixels like 1920 px by 1080 px  a 16:9 aspect ratio image with a fixed resolution.    You display displays one size fixed resolution image like ie 1920px by 1080px 133ppi image.  Your image may or may not  fit on your display and it it does it may not fill the display's  image area your image may have a different aspect ration than your display's image area.   The ways an your image size is changed on your displays is by Photoshop quickly scaling you image the have a different number of pixels.  The only time you see you actual  images  pixels is when Photoshop scales your  image toe 100%.  Zoomed to actual image pixels. The image may or may not fit on you display and  the image on screen is at the display's resolution not your image Print resolution if the print resolution is different then the display's fixed resolution.

A Photoshop image can be printed many sizes by changing the image's Print resolution.  All prints will have the same 1920px by 1080Px images  all have exactly the same pixels. However they are print at a different pixel density PPI the pixels have a different Physical print size.

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@egyrm wrote:

I think the title gives it away pretty much. I always open my files at 1920p x 1080p with 200 dpi. I did not touch anything, did not change anything but now files are becoming a large file right after I create a new layer. \

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Hi @egyrm 

Instead of "large file" (which is vague) can you give us specific numbers, possibly with screen shots? I think you are saying this happens every time. To confirm:

• You create a new file: 1920 px x 1080 px with 200 ppi (pixels per inch, as dots per inch only happen with ink on paper)
  Can you show a screen shot of the the dialogs for New and for Image > Image Size?
• Then you add a layer: is this a pixel layer? a smart object? a type layer?
  Can you show a screen shot of the dialog for Image > Image Size?

How much larger does the image get when you add a layer? If you give us you exact steps then we can try the same steps on our systems to see if we get the same or different results.

If we can't reproduce it, then you may need to go to Preferences > Resets Preferences on Quit (after backing up customization), but let us see if it is the same for us first.

~ Jane

Image Size show the document canvas is no longer 1920x1080 pixels? How did you create the new layer? Are you sure something is not zooming photoshop image image? What dose the Tab or Window Image show as current zoom percentage.

This is an article that may have some potential solutions to large photoshop files.

https://learn-photoshop.club/resources/why-photoshop-increases-your-file-size/

Best to post in the Photoshop for Mobile forum, this the Photoshop (for computers) forum:

https://community.adobe.com/t5/photoshop-for-mobile/bd-p/Photoshop-for-Mobile?page=1&sort=latest_replies&filter=all