Image DPI Changer: Set 300 DPI for Printing
Change the DPI of JPG and PNG images to 72, 96, 150, 200, 300 or 600 without altering the pixels, for correct print size in Word, InDesign and print shops.
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How to change the DPI of an image
DPI (dots per inch, often called PPI for images) is a small value stored inside JPG and PNG files that tells layout programs and printers how large to print the image. A photo of 3000 × 2000 pixels at 300 DPI prints at 10 × 6.7 inches; the same pixels tagged with 72 DPI would be placed at more than 41 inches wide. Print shops, publishers and online forms therefore often ask for "300 DPI" images.
The Image DPI Changer writes the DPI value you choose directly into the file: into the JFIF header of JPG images and into the pHYs chunk of PNG images. The pixels are not resampled, so image quality and dimensions stay exactly the same; only the stored print resolution changes. 300 DPI is preselected, and 72, 96, 150, 200 and 600 DPI are available under More options. WebP, GIF and BMP files can be added too, but DPI is only written to JPG and PNG output, so choose one of those formats under Format.
How to use the Image DPI Changer
- Drop your images onto the upload area, click it to choose files, or paste an image with Ctrl+V. This page accepts JPG, PNG, WebP, GIF and BMP files, many at once and up to 80 MB each.
- Keep 300 DPI for professional printing, or choose another value under More options → DPI: 150 to 200 DPI is fine for posters viewed from a distance, 72 to 96 DPI is the screen convention.
- Check the print size you will get: pixel width ÷ DPI = width in inches (× 2.54 for centimetres). If it is too small for your print, you need more pixels, not just a higher DPI value.
- Check the result with the before/after slider: drag the divider across the preview and read the new dimensions, file size, quality and percentage saved underneath. Any change to the settings re-processes every image automatically.
- Download a single image, or use Download all (ZIP) for the whole batch. Under More options you can also set a DPI value and a file-name pattern with {name}, {w} and {h}.
When the DPI value matters
- Print shops and photo labs. Many order forms check the DPI tag and reject 72 DPI files even when the pixel count is sufficient.
- Word, InDesign and PowerPoint. These programs use the DPI value to set the initial size when you insert an image.
- Application and ID photos. Some portals require a specific DPI together with exact pixel dimensions; set the size first with custom image resize.
- Screens ignore DPI. Websites and apps display images by pixels, so for web use focus on dimensions and compression with the image compressor.
Changing DPI never adds detail. A 600 × 400 pixel image tagged at 300 DPI simply prints at 2 × 1.33 inches; to print it larger at good quality you need a larger source image.
Private, free and fast
The whole job runs in your browser: images are decoded, resized and re-encoded on your own device, so nothing is uploaded to a server. There is no sign-up, no watermark and no daily limit, and location and camera data (EXIF) are removed from every result.
Features
- Writes DPI into JPG (JFIF) and PNG (pHYs)
- Pixels and quality unchanged
- 72, 96, 150, 200, 300 and 600 DPI
- 300 DPI preselected for printing
- Batch processing with ZIP download
- Metadata removed, files stay private
Frequently asked questions
Does changing DPI change image quality?
No. Only the stored print resolution changes; the pixels are not resampled, so the image looks exactly the same on screen.
How do I convert an image to 300 DPI?
Add the image, keep the preselected 300 DPI and download the result. For JPG or PNG the 300 DPI value is written into the file.
What print size will my image have at 300 DPI?
Divide the pixel dimensions by 300: 2400 × 3000 pixels print at 8 × 10 inches (about 20 × 25 cm).
Can I change the DPI of WebP images?
This tool writes DPI only to JPG and PNG output. Convert WebP to JPG or PNG under Format to store a DPI value.
Is 72 DPI bad quality?
Not by itself. 72 DPI is only a tag; quality depends on the number of pixels. For print, though, many services expect the tag to say 300.
Are my images uploaded to a server?
No. The images are processed locally in your browser and never leave your device. Closing the tab discards them.