How to Set Image Resolution in DPI

To change an image’s print resolution in Photoshop while keeping its existing pixels, open Image > Image Size, turn off Resample, enter the target resolution in pixels per inch (PPI), check the resulting print dimensions, and select OK. If you need a particular physical print size and pixel density, leave Resample on only when you intend Photoshop to add or remove pixels.

People often call an image’s PPI setting “DPI.” Strictly, PPI means pixels per inch in an image; DPI means the printer’s output dots per inch. For setting an image’s print dimensions, the useful setting in Photoshop is PPI. The distinction matters because changing that setting alone does not create image detail. [Adobe: Image size and resolution; GIMP 3.0 manual: Print Size]

1. Understand pixels, PPI, and print size

Three quantities are linked: the image’s pixel dimensions, its resolution in PPI, and its physical print dimensions. With the units in inches:

print width in inches = pixel width ÷ PPI
print height in inches = pixel height ÷ PPI
required pixels = print size in inches × target PPI

For example, Adobe illustrates that an image of 1800 × 1200 pixels prints at 18 × 12 inches at 100 PPI. Set it to 300 PPI with Resample off and it becomes 6 × 4 inches. The pixel count stays 1800 × 1200; those pixels are assigned to a smaller physical area. [Adobe: Resize images and change resolution]

What you change	Pixel dimensions	Implied print size	What happens to image data
PPI with Resample off	Stay the same	Changes	No pixels added or removed
Print size or PPI with Resample on	Can change	Can meet the target	Pixels are recalculated

Changing only PPI metadata does not sharpen an image or improve its on-screen detail. Screens display the image’s pixel data; the print dimensions associated with that data depend on the output size and density.

2. Set resolution in Photoshop without resizing the pixels

1. Open the image in Photoshop.
2. Choose Image > Image Size.
3. Turn off Resample if you want to preserve the pixel dimensions.
4. Enter the desired resolution in the Resolution field, usually expressed in pixels per inch.
5. Check the displayed width and height. Those are the print dimensions at the chosen PPI.
6. Select OK to apply the change, then save the image.

With Resample off, changing the resolution changes the implied print size while keeping the existing pixels. If the image is 1800 × 1200 pixels, setting 300 PPI implies a 6 × 4 inch print. It does not turn the image into a higher-detail 300-PPI source; it describes how densely its existing pixels are assigned for print. [Adobe Photoshop Help: Image size and resolution]

Check the units and dimensions

Confirm the resolution unit and the width and height units before editing. A value in pixels per centimeter is not the same numeric value as pixels per inch. If you see pixel dimensions changing while you edit, check whether Resample is enabled. Also verify that the print dimensions are plausible: an accidental unit choice can imply an unexpectedly large or small print.

3. Decide whether to resample

Turn Resample off when the request is simply “change this image to 300 DPI” or “set the print resolution without resizing.” This preserves the original pixels and changes the physical size associated with them.

Turn Resample on when you need the file to contain a different number of pixels for a specified print size and PPI. Calculate the target pixel dimensions first. For a 10 × 8 inch print at 300 PPI, for example, the target is 3000 × 2400 pixels. If the source is smaller, upsampling estimates new pixels; it cannot restore fine detail absent from the original. If the source is larger, downsampling removes pixels to meet the target. Inspect the result at its intended output size and follow the print provider’s specifications. [Adobe Photoshop Help: Image size and resolution]

Quick calculation examples

Source pixels	Target PPI	Approximate print size without resampling
1800 × 1200	300	6 × 4 in
2400 × 3000	300	8 × 10 in
1200 × 800	300	4 × 2.67 in

These are arithmetic estimates. A printer or print service may request a different resolution or file setup, so its job requirements control.

4. Choose a resolution for the output

Adobe describes 300 PPI as a common setting for best print quality, unless the printer requires another value. It also gives 72–96 PPI as typical for screen and web images. Treat these as general Adobe guidance, not universal standards for every printer, viewing distance, or screen. Check the requirements for the actual job. [Adobe Photoshop Help; Adobe Learn; Adobe: Resolution]

• For a print job: start with the print provider’s requested physical size, resolution, and file format.
• For a screen or web image: plan the pixel dimensions required for the display. Changing print PPI metadata alone does not add screen detail.
• When no specification is supplied: calculate the print size supported by the existing pixels and ask the provider if the expected quality or output size is uncertain.

“300 DPI” is often used conversationally for an image set to 300 PPI. In a strict technical description, the image editor assigns pixels per inch; the printer produces dots per inch, and several printer dots may contribute to rendering one image pixel. [GIMP 3.0 manual]

5. Change print size in GIMP

In GIMP 3.0, use Image > Print Size to change the image’s printed dimensions and output resolution. Enter the print dimensions or resolution and review the other displayed values before applying the change. The manual distinguishes image output resolution from printer resolution: image resolution is expressed in pixels per inch, while printer DPI describes the printer’s output. Menu names can differ between software versions, so these steps refer specifically to GIMP 3.0. [GIMP 3.0 User Manual: Print Size]

As in Photoshop, decide whether your task is to change the physical print size associated with existing pixels or to produce new pixel dimensions. The target print size, output resolution, and pixel data must agree; changing a resolution value by itself cannot supply missing detail.

6. Checklist before saving or sending a file

• Confirm whether the request means image PPI or printer DPI.
• Write down the required print width and height, not just a resolution number.
• Calculate target pixels as inches × PPI, or available inches as pixels ÷ PPI.
• Turn Resample off to retain the existing pixel count.
• Turn Resample on only if the target requires a new pixel count; inspect upsampled results for softness or artifacts.
• Verify the editor’s resolution units and the final pixel dimensions.
• Follow the printer or print provider’s requirements when they differ from a general guideline.
• Save a copy if you need to retain the original file and its settings.

7. Troubleshooting common resolution problems

Problem	Likely cause	What to do
Pixel dimensions changed unexpectedly	Resample was enabled.	Undo or reopen the original, turn Resample off, and change PPI again if you only meant to change print dimensions.
The print became smaller after setting 300 PPI	The same pixels are now assigned to each inch more densely.	This is expected with Resample off. Confirm that the resulting print size suits the job; resampling is needed to change pixel count, but cannot create original detail.
The image still looks the same on screen	Only print resolution metadata changed.	That change does not alter the screen pixel data. To change displayed size or detail, use the required pixel dimensions or display scaling.
The file says 300 PPI, but the print looks soft	The source may not contain enough useful detail at the selected print size; upsampling can only estimate pixels.	Check the original pixel dimensions and inspect at the intended print size. Ask the print provider about its requirements.
The displayed size is unexpectedly large or tiny	Units may be set to centimeters, or a different PPI unit may be selected.	Check both dimension units and resolution units, then recalculate using consistent units.
A print provider rejects the file	The job may require particular pixel dimensions, resolution, format, or other setup.	Use the provider’s documented specifications. A generic 300-PPI recommendation does not override a job-specific requirement.
GIMP’s menu does not match these steps	The instructions describe GIMP 3.0; another version may have a different interface.	Check the manual for the installed version and locate its print-size or resolution controls.

8. Performance, reliability, and file-size notes

Changing PPI with Resample off updates the print-size relationship while preserving the pixels; it does not require inventing image detail. Resampling changes pixel data and may take more time for large images. Upsampling can make a file’s pixel dimensions larger without making its source detail equally richer. Downsampling reduces pixel data and can discard detail, so retain an original when you may need another output size.

Resolution metadata alone is not a dependable way to reduce or increase a file’s visual quality. If a delivery system checks actual pixel dimensions, setting a higher PPI with resampling off will not satisfy a larger pixel-dimension requirement. Conversely, a file with sufficient pixels may still need its print-size metadata or export settings adjusted to match the recipient’s workflow. Reopen or inspect the saved copy and verify both pixel dimensions and print dimensions before delivery.

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curl -G "https://api.screenshotneo.com/v1/shot" \
  -d access_key=YOUR_API_KEY \
  --data-urlencode url=https://stripe.com \
  -o shot.webp

import requests

r = requests.get(
    "https://api.screenshotneo.com/v1/shot",
    params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"},
    timeout=90,
)
open("shot.webp", "wb").write(r.content)

const q = new URLSearchParams({
  access_key: 'YOUR_API_KEY',
  url: 'https://stripe.com'
});
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`Screenshot request failed: ${res.status}`);
const bytes = new Uint8Array(await res.arrayBuffer());
await import('node:fs/promises').then(fs => fs.writeFile('shot.webp', bytes));

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10. FAQ

Does changing an image to 300 DPI make it higher quality?

No. If Resample is off, the pixel data stays the same; only its implied print size changes. Resampling can change pixel dimensions but cannot recover detail absent from the source.

How do I change DPI without resizing?

In Photoshop’s Image Size dialog, turn off Resample, enter the desired PPI, and check the resulting print dimensions. The pixel dimensions should remain unchanged.

What is the difference between 300 PPI and 300 DPI?

PPI describes image pixels assigned per inch of print. DPI describes printer output dots per inch. People often use “DPI” for an image’s PPI setting, but they refer to different parts of the output process.

What resolution should I use for a particular print?

Use the print provider’s specification. Adobe presents 300 PPI as common guidance for best print quality, not a rule for every printer or job.

Sources

• Adobe Photoshop Help: Image size and resolution (updated September 28, 2026).
• Adobe Learn: Resize images and change resolution.
• Adobe: Resolution.
• GIMP 3.0 User Manual: Print Size.