How to change the DPI of an image: in Photoshop, open Image > Image Size, untick Resample and type 300 in Resolution. In GIMP use Image > Print Size; in Mac Preview use Tools > Adjust Size with Resample unticked. This changes only the print size, not the pixels. A sharp 8×10 print at 300 DPI needs 2400×3000 pixels.
DPI is one of the most misunderstood numbers in imaging. Print shops, Etsy printable buyers and publishers ask for "300 DPI", while screens and marketplaces ignore DPI completely. What actually decides print quality is the number of pixels. This guide explains DPI and PPI, when 300 DPI matters, how many pixels each print size needs, how to change the DPI setting in Photoshop, GIMP, Preview and on Windows without damaging the image, and what to do when you don't have enough pixels.
- DPI only matters for print. Websites, marketplaces and social apps use pixel dimensions and ignore the DPI value.
- Pixels ÷ DPI = print inches. A 3000×2400 image prints 10×8 inches at 300 DPI, or 20×16 at 150 DPI.
- Change DPI without resampling to keep every pixel; only the stated print size changes.
- 300 DPI is the standard for close-up prints; 150–200 is fine for posters viewed from a distance.
- Not enough pixels? Typing 300 doesn't add detail. Upscale the image first, ideally with an AI upscaler.
What is DPI, and is it the same as PPI?
PPI (pixels per inch) is how densely an image's pixels are spread when printed; DPI (dots per inch) is technically how many ink dots a printer lays down. In everyday use, and in most software, "DPI" means PPI, and this guide uses them the same way.
A digital image is just a grid of pixels, say 3000 wide and 2400 tall. The DPI value is a note stored in the file that says how many of those pixels to fit into each printed inch. Change it from 72 to 300 and nothing about the pixels changes; the image would simply print smaller and denser. That's why two files with the same pixels but different DPI values look identical on screen.
Does DPI matter for online images?
No. Screens display pixels one to one (or scaled by the device), so a 2000×2000 product photo looks the same at 72 DPI or 300 DPI. Amazon, Etsy, Shopify, eBay and social platforms all specify images in pixels. The old "72 DPI for web" rule is a leftover from early Mac monitors and can be ignored. If a marketplace rejects an image for being too small, the fix is more pixels, not a higher DPI number; the free marketplace image resizer helps you hit exact pixel sizes.
When does 300 DPI matter?
When the image will be printed and viewed up close: photo prints, product inserts, packaging, business cards, books, and Etsy printables buyers print at home. At normal reading distance, people can't see individual pixels at around 300 per inch. Large prints viewed from further away need fewer.
| Print type | Viewing distance | DPI that looks sharp |
|---|---|---|
| Business cards, labels, inserts | Hand-held | 300 |
| Photo prints, art prints up to 11×14 | Arm's length | 240–300 |
| Posters 16×20 and up | 1–2 m | 150–200 |
| Banners and trade-show graphics | Several meters | 72–150 |
| Billboards | Far away | Under 50 |
Always follow your printer's or publisher's own spec if they give one.
How many pixels do you need for each print size?
Multiply the print size in inches by the DPI. At 300 DPI, every inch needs 300 pixels.
| Print size (inches) | Pixels at 300 DPI | Pixels at 150 DPI |
|---|---|---|
| 4×6 | 1200×1800 | 600×900 |
| 5×7 | 1500×2100 | 750×1050 |
| 8×10 | 2400×3000 | 1200×1500 |
| 8.5×11 (US Letter) | 2550×3300 | 1275×1650 |
| A4 (8.27×11.69) | 2480×3508 | 1240×1754 |
| 11×14 | 3300×4200 | 1650×2100 |
| 16×20 | 4800×6000 | 2400×3000 |
| 18×24 | 5400×7200 | 2700×3600 |
| 24×36 | 7200×10800 | 3600×5400 |
To check what you have, divide your pixels by the print size. A 12-megapixel phone photo (4032×3024) gives about 13.4×10 inches at 300 DPI, enough for an 8×10 or 11×14 at a slightly lower DPI. For selling printable art, our guide to photographing artwork for prints covers capturing enough resolution in the first place.
How to change the DPI of an image without losing quality
Turn resampling off, then type the new DPI. The pixel dimensions stay the same and only the printed size changes, so there's no quality loss at all.
In Photoshop
- Open the image and choose Image > Image Size.
- Untick Resample.
- Type 300 in Resolution (Pixels/Inch). Width and Height in inches update; the pixel dimensions don't.
- Click OK and save a copy.
In GIMP (free, Windows, Mac, Linux)
- Open the image and choose Image > Print Size.
- Set X and Y resolution to 300 pixels/in (keep the chain linked).
- Click OK, then File > Export As to save a JPG, PNG or TIFF.
Print Size never resamples. Don't use Image > Scale Image for this; that changes the pixels.
In Preview on a Mac
- Open the image and choose Tools > Adjust Size.
- Untick Resample image.
- Type 300 in Resolution (pixels/inch). Width and height in inches shrink to match.
- Click OK, then save or export.
On Windows
Paint and the Photos app don't let you set DPI. You can see the current value under the file's Properties > Details, but to change it, use GIMP (above) or a free viewer such as IrfanView, whose resize dialog includes a DPI field; set it there without changing the pixel size. Photoshop and Affinity Photo work the same way as on a Mac.
In Canva and online DPI changers
Canva doesn't offer a DPI field, but its PDF Print download is meant for printing at 300 DPI, which is what most print shops want. Online "DPI changer" sites rewrite the DPI value in the file the same way as the methods above; check whether they upload your file before using one for client work.
Many print services ignore the DPI tag and simply scale your pixels to the size you order. What protects quality is enough pixels for that size, so check the table above before you order.
What if your image doesn't have enough pixels?
Then you need to add pixels, and typing a higher DPI won't do it. Changing 72 to 300 with resampling off just makes the print smaller; with resampling on, the editor invents in-between pixels, which looks soft once you enlarge more than about 1.5×.
- Find a bigger original. The camera file, the full-size download or the original design file always beats enlarging.
- Print smaller or at a lower DPI. 200 DPI is often fine for an art print; 150 for a poster.
- Resample carefully. Photoshop's Preserve Details 2.0 or Super Resolution handle about 2× well.
- Use an AI upscaler. Our AI image upscaler enlarges an image 4× and redraws edges and texture (3 credits). A 1000×1250 image becomes 4000×5000, enough for a 13×16 inch print at 300 DPI. Then set the DPI to 300 without resampling.
- Sharpen soft photos. The AI sharpen tool makes an image sharper and 4× larger in one step.
Upscaling guesses detail, so check text, faces and fine patterns at 100% zoom before sending a file to print. Our guides on how to make a picture higher resolution and upscaling product photos compare the methods.
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- Pixel dimensions meet the table above for your print size and DPI.
- DPI set to 300 (or the printer's spec) with resampling off.
- Color profile as your printer asks; sRGB is the safe default for consumer print services.
- Saved as high-quality JPG (quality 90 or more), PNG or TIFF, not a re-compressed web copy. Keep file size in check with these tips if an upload limit applies.
- Bleed and trim margins added if the printer requires them.
- A test print or proof checked before a large run.
Frequently asked questions
How do I change the DPI of an image to 300?
In Photoshop, choose Image > Image Size, untick Resample and type 300 in Resolution. In GIMP use Image > Print Size; in Mac Preview use Tools > Adjust Size with Resample image unticked. The pixels don't change, only the print size.
Does changing DPI change image quality?
No, as long as resampling is off. Changing DPI only rewrites how large the image prints. Quality depends on the pixel dimensions, which stay the same.
How do I change DPI on Windows without Photoshop?
Paint and Photos can't set DPI. Use GIMP, which is free: Image > Print Size, set the resolution and export. IrfanView's resize dialog also has a DPI field you can change without resizing.
What DPI should images be for the web?
DPI doesn't matter online. Websites and marketplaces use pixel dimensions, so a 2000 by 2000 image looks the same at 72 or 300 DPI. Focus on the pixel size the platform asks for.
How many pixels is 300 DPI?
300 pixels per printed inch. So a 4 by 6 inch print needs 1200 by 1800 pixels and an 8 by 10 needs 2400 by 3000 pixels at 300 DPI.
How do I make a low-resolution image 300 DPI?
If it doesn't have enough pixels for the print size, upscale it first, ideally with an AI upscaler that adds detail, then set the DPI to 300 with resampling off. Just typing 300 makes the print smaller, not sharper.
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