DPI Converter — Change Image DPI Online
Free online DPI changer. Convert any image to 72, 150, 300, 600 DPI or any custom value for print-ready output. Your files stay in your browser — nothing is uploaded.
Drop your image here or click to browse
JPG, PNG, WebP — up to 20 MB
How to change your DPI
Changing an image's DPI takes three steps: upload your image, pick a DPI value, and click convert. The tool writes the new DPI into the JPEG file header (the JFIF segment) without altering any pixel data. Your image quality stays identical — only the print instructions change. The converted file downloads as a JPEG with the correct DPI metadata embedded, so printers and design software read it automatically. For a full walkthrough, see our guide on how to change image DPI for printing.
You can use the preset buttons (72, 96, 150, 300, 600) or type any value into the custom field. The print size calculator updates in real time so you can see exactly how large your image will print at the selected DPI before converting.
What DPI do I need?
| DPI | Best for | Print quality |
|---|---|---|
| 72 | Websites, email, social media | Screen only — not for printing |
| 96 | Windows default screen resolution | Screen only |
| 150 | Large posters, banners, billboards | Good at viewing distance (1+ metres) |
| 300 | Photos, brochures, business cards, magazines | High quality — industry standard for print |
| 600 | Fine art prints, technical drawings, medical imaging | Maximum detail — used for close inspection |
If you're unsure, 300 DPI is the safe choice for almost all print jobs. Print shops, online photo services, and design software all expect 300 DPI as the default for high-quality output.
Convert to 600 DPI
600 DPI is used when you need maximum sharpness — fine art reproduction, detailed architectural drawings, scientific illustrations, or any print where viewers will examine the image closely. Select the 600 DPI preset button or type 600 in the custom field. The tool embeds 600 DPI metadata into your JPEG, and the print size calculator shows you the physical dimensions at that resolution.
Keep in mind that 600 DPI means more dots per inch, so your image prints physically smaller. A 3000 × 2000 pixel image prints at 5" × 3.3" at 600 DPI, compared to 10" × 6.7" at 300 DPI. If you need a larger print at 600 DPI, you'll need a higher-resolution source image. You can check your image dimensions with the image resizer tool.
DPI for common print sizes
Here's how many pixels you need for standard print sizes at 300 DPI (the recommended resolution for quality prints):
| Print size | Pixels needed at 300 DPI | Typical use |
|---|---|---|
| 4" × 6" | 1200 × 1800 | Standard photo prints |
| 5" × 7" | 1500 × 2100 | Framed photos, greeting cards |
| 8" × 10" | 2400 × 3000 | Wall prints, portfolios |
| A4 (8.3" × 11.7") | 2490 × 3510 | Documents, flyers, brochures |
| 11" × 14" | 3300 × 4200 | Large wall prints |
| A3 (11.7" × 16.5") | 3510 × 4950 | Posters, large documents |
The DPI converter shows your image's print size after conversion, so you can confirm it meets the size requirements before sending it to a print shop.
DPI vs PPI — what's the difference?
DPI (dots per inch) describes how many ink dots a printer places per inch of paper. PPI (pixels per inch) describes how many pixels fit per inch on a screen. When preparing images for print, the terms are often used interchangeably — if someone asks for a "300 DPI image," they mean an image with 300 PPI metadata so it prints at the correct size. This tool sets the PPI/DPI metadata in the file header, which is exactly what printers and design software read.
DPI for passport photos and IDs
Most government ID and passport photo requirements specify 300 DPI at a specific print size (typically 2" × 2" for US passports or 35mm × 45mm for UK/EU passports). Use this tool to set your image to 300 DPI, then check the print size calculator to confirm it matches the required dimensions. If your image is too large or too small, resize it first, then set the DPI.
Your image stays private
This DPI converter runs entirely in your browser using JavaScript. Your image is never uploaded to any server. You can verify this by disconnecting from the internet — the tool still works. After converting, you can also compress the image to reduce the file size for email or web use.