Change DPI of Image Online: Set 300 DPI Free
Change image DPI to 72, 96, 150, 300, or 600 DPI for high-resolution printing without changing pixel dimensions or losing image quality. 100% private.
100% private. Nothing is uploaded.
How to Change DPI of an Image Online
Add Your JPG or PNG
Drop a JPG or PNG on the box, or click to choose one. The tool shows the DPI the file has now.
Pick a DPI Value
Click a preset (72, 96, 150, 200, 300 or 600) or type any whole number from 1 to 9999 in Custom. The default is 300.
Download the New File
Press Download at 300 DPI, or at the value you picked. The file keeps its format and gets -300dpi (or your value) added to its name.
Key features
Presets From 72 to 600 DPI
Pixels Stay Exactly the Same
- Shows the Current DPI First
- Images Stay on Your Device
- Works on JPG and PNG
- Free, No Account
When to Change Image DPI
Print Preparation
- Set 300 DPI for photo prints, flyers, brochures and posters
- Set 600 DPI for line art, fine-art prints and detailed scans
- Fix a file a printer flags as 72 DPI when it has enough pixels
- Label a scanned JPG or PNG with the DPI it was scanned at
Forms and Submissions
- Meet a 300 DPI rule on visa, exam or job application forms
- Pass a print shop's DPI check before you order
- Follow journal and thesis rules for 300 or 600 DPI figures
- Replace the 72 DPI that phones and cameras often save
Documents and Screens
- Set 72 DPI when a template or brief asks for it
- Set 96 DPI to match the standard Windows screen setting
- Control how big a picture first appears in some document apps
- Give each image in a set the same DPI, one file at a time
What Does Changing the DPI of an Image Do?
Changing the DPI of an image rewrites a number saved in the file that tells printers how many pixels to fit into each inch. The pixels stay the same, so the image looks identical on screen and only its print size changes. Resizing is different: it adds or removes pixels.
How to Change an Image to 300 DPI
Load a JPG or PNG, pick 300 and press Download at 300 DPI. Before you print or submit the file, use the answers below to check that it also has enough pixels for the job.
How Big Will an Image Print at 300 DPI?
Divide each side in pixels by 300 to get the print size in inches. If that is smaller than the print you need, a higher DPI number won't help: the image needs more pixels.
- 2400×1800 px prints at 8×6 inches.
- 3000×2000 px prints at 10×6.7 inches.
- 4032×3024 px, a common 12 MP phone photo, prints at about 13.4×10 inches.
72 vs 96 vs 300 DPI: Which Should You Use?
On a screen, there is no difference. Websites and phones show every pixel the same way at any DPI, so the number only matters when an image is printed or placed in a document.
- 72 DPI: the value many phones and cameras save by default. Fine for the web, but print apps will make the image very large.
- 96 DPI: the standard screen setting on Windows. Some document apps use the DPI to decide how big a picture first appears.
- 150 DPI: enough for posters and banners seen from a few feet away.
- 300 DPI: the usual request for photo prints, flyers, books and many upload forms.
- 600 DPI: for line art, detailed scans and some journal figures.
Do Forms and Passport Photos Need 300 DPI?
Only when the form says so, and the pixel size usually matters more than the DPI number. Visa, exam and job forms often list a width and height in pixels and a top file size in KB. Some also ask for 300 DPI. Set the DPI here, then check that the pixel size and KB match the rules too.
Should You Change the DPI or Resize the Image?
Change only the DPI when the image already has enough pixels for your print size, since this tool never adds or removes pixels. To change the pixels and the DPI in one step, use the image resizer and set Output DPI under Advanced. To make a small photo bigger with AI, try the image upscaler.
Why Does an App Still Show the Old DPI?
A JPG can store its DPI in two places: the JFIF header and the EXIF data. The tool updates both when it can, and shows both values before you start if they disagree. If the EXIF value can't be changed safely, the tool tells you. Most files still download, with a note that a few apps may show the old number. A few plain-RGB JPGs are refused until you re-save them as a standard JPG.
More Image Tools
More free tools to edit, resize, and convert images in your browser.
Image Upscaler
Add real pixels with AI upscaling, 2× or 4×.
Resize Image
Resize to exact pixel dimensions or print size.
Image Metadata Viewer
See the EXIF data, GPS location and DPI in JPG, PNG, HEIC and TIFF photos.
Image Compressor
Reduce file size after editing without visible quality loss.
Check Image Dimensions
Check an image's DPI and the size it prints at in cm, mm or inches before you change it.
Change Image DPI FAQ
Common questions about changing image DPI online
Does changing DPI affect image quality?
No. The tool rewrites only the DPI value and copies the rest of the file byte for byte, so nothing is compressed again. A 3000×2000 image stays 3000×2000 at any DPI, and camera details and other data in the file stay as they were. Real extra detail needs more pixels, which a DPI change can't add.
Can I change 72 DPI to 300 DPI?
Yes. Load the image, pick 300 and press Download at 300 DPI. The pixels don't change, so the print size shrinks: a 3000-pixel-wide image goes from about 41.7 inches wide at 72 DPI to 10 inches at 300 DPI. If 10 inches is too small for your print, the image needs more pixels.
Why does my print shop ask for 300 DPI?
At 300 DPI, photos and text look sharp at normal reading distance. Print software reads the DPI value to set the print size, so a 72 DPI file can come out huge or get flagged as low quality. Setting 300 DPI fixes the label, but the image also needs 300 pixels for every inch you print.
How do I check the DPI of an image?
Drop the image on this page. Before you change anything, it shows the current value, such as "Current DPI: 72 (from EXIF data)", or "This file has no DPI saved." To see the print size of many images at once in cm, mm or inches, use the check image dimensions tool.
Which image formats can I change the DPI of?
JPG and PNG. In a JPG, the tool writes the JFIF header and updates the EXIF resolution if there is one. In a PNG, it writes the pHYs chunk. The tool takes JPG and PNG only, so convert WebP, AVIF or GIF files to one of those first. A few JPGs saved with plain RGB color can't take a DPI change unless the tool can update their EXIF resolution, and it asks you to re-save those as a standard JPG.