What DPI means and why it matters for your project

DPI (dots per inch) is the number of pixels Photoshop will print in every inch of physical paper. A higher DPI means a sharper, more detailed print. A lower DPI means a smaller file and faster screen display, but blurry output if you print it.

The DPI you need depends entirely on what you're making. If you're designing something for a website or social media, DPI doesn't matter at all — screens ignore it. If you're printing a photograph or a poster, you want 300 DPI minimum. If you're printing a document with text, 72 DPI is often enough. If you're sending work to a professional printer, ask them what DPI they require before you start — some want 400 DPI, some want 600.

Changing DPI in Photoshop does not change the actual pixels in your image. It only changes the instruction that tells a printer how to space those pixels on paper. If your image is 1000 pixels wide and you change it from 72 DPI to 300 DPI, the image will print smaller, not sharper.

Key Takeaways

  • DPI only affects printing — it has no effect on how your image looks on a screen or in social media.
  • To change DPI in Photoshop, go to Image menu, then Image Size, and change the DPI number in the Resolution field.
  • Changing DPI does not add detail to a blurry image; it only tells the printer how to space the pixels you already have.
  • Most photographs and posters need 300 DPI for print; documents with text can use 72 DPI; ask your printer what they require.
  • If you need a larger print with the same DPI, you must increase the pixel dimensions first, which means starting with a larger original image or using upscaling software.

How to open the Image Size dialog

Open your image in Photoshop. At the top of the screen, click the Image menu. A dropdown list will appear.

From that list, click Image Size. A dialog box titled "Image Size" will open. This is where you change the DPI.

Where to find and change the DPI number

In the Image Size dialog, look for the section labeled Resolution. You will see a number followed by "pixels/inch" (this is DPI). The current DPI of your image appears in that field.

Click on the number and type the new DPI you want. If you're printing a photograph, type 300. If you're printing a document, type 72. If your printer gave you a specific requirement, type that number instead.

Make sure the chain link icon next to the resolution is not connected (it should look broken). If it is connected, changing DPI will also shrink your image dimensions, which is usually not what you want. A broken chain means DPI and dimensions are independent.

What happens when you change DPI without changing image size

When you change only the DPI and leave the pixel dimensions alone, your printed image will be a different physical size. If your image is 1000 pixels wide and you change from 72 DPI to 300 DPI, it will print 13.9 inches wide at 72 DPI but only 3.3 inches wide at 300 DPI.

This is the correct behavior if you want to print smaller. But if you want to print the same size with better quality, you need more pixels first. You cannot add detail by raising DPI alone.

When you need to increase pixels before changing DPI

If you want a large print (say, 8 by 10 inches) at 300 DPI, you need at least 2400 by 3000 pixels. If your image is only 1000 by 1500 pixels, raising the DPI will not help — the print will be blurry because you don't have enough pixels to work with.

Your options are: start over with a larger original image, use upscaling software like Topaz Gigapixel AI or Adobe's Super Resolution (in Photoshop 2024 and later), or print smaller. Upscaling adds pixels by guessing what the missing detail should be, which works better for photographs than for text or graphics. It is not magic — a 1000-pixel image upscaled to 2400 pixels will never be as sharp as a photograph taken at 2400 pixels to begin with.

Saving your image after changing DPI

After you change the DPI, click OK to close the Image Size dialog. The change is now part of your Photoshop document, but it is not saved yet.

To save, go to File menu and choose Export As (for JPG, PNG, or other formats) or Save As (to save as a Photoshop PSD file). When you export as JPG or PNG, the DPI information is embedded in the file and will be read by your printer or print service.

Frequently Asked Questions

Does changing DPI make my image sharper?

No. DPI only tells the printer how to space the pixels you already have. If your image is blurry, changing DPI will not fix it. You need more pixels or a sharper original image.

What DPI should I use for Instagram or Facebook?

DPI does not matter for social media. Screens display images by pixel count, not DPI. Set your image to 72 DPI and upload it at the pixel dimensions the platform recommends (usually 1080 pixels wide for Instagram feed posts).

Can I change DPI after I've already exported the image?

Yes. Open the original Photoshop file (the PSD), change the DPI in Image Size, and export again. If you only have the exported JPG or PNG, you can open it in Photoshop and change the DPI, but the image quality will not improve because the pixels themselves have not changed.

My printer asked for 400 DPI instead of 300. Will my image look different?

Only if you also increase the pixel dimensions. If you change DPI from 300 to 400 without changing pixels, your printed image will be smaller. To print the same size at 400 DPI, you need more pixels than you needed at 300 DPI.

What if I don't know what DPI my printer needs?

Ask them directly before you start designing. If you're using a home printer, 300 DPI is the safe choice for photographs. If you're sending to a professional print shop, they will tell you their requirement — it varies by service and by what you're printing.