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Change an image’s DPI

Files never leave your device. All processing happens in your browser.

300 for print, 72 or 96 for screen. The pixels do not change.

How to convert Image to New DPI

  1. 1

    Drop in the JPG or PNG your printer rejected.

  2. 2

    Set the DPI — 300 is the usual requirement.

  3. 3

    Download. The image is byte-identical apart from that one number.

This tool does something narrower than its name suggests, and understanding that will save you a great deal of confusion. DPI is not a property of an image. It is a note attached to the file saying how large it should be printed. Changing it changes the note, not the picture.

What DPI actually means

An image is a grid of pixels — say 3000 across. That number is fixed. DPI, dots per inch, tells a printer how densely to lay those pixels down. At 300 DPI, 3000 pixels occupy 10 inches. At 72 DPI, the same 3000 pixels are spread across nearly 42 inches. Same file, same pixels, different printed size.

So when a print shop or a journal asks for "300 DPI", what they usually mean is "enough pixels to look sharp at the size we are printing it". Setting the metadata to 300 does not create pixels. If your image is 500 pixels wide, tagging it 300 DPI just means it will print sharply at 1.7 inches — it does not make it suitable for a full page.

When changing the number is the correct fix

  • Your image has plenty of pixels but was exported at 72 DPI, and an automated checker is rejecting it on the tag alone. This is extremely common and this tool solves it completely.
  • A layout program is placing your image at the wrong physical size because it is reading the embedded value.
  • A submission system demands a specific value and validates the metadata rather than the dimensions.
  • You need consistent metadata across a set of images going into the same document.

When it is not

If the real problem is that the image looks soft or pixelated in print, no DPI value will fix it. You need more pixels, which means going back to a higher-resolution original or re-shooting. A tool that claims to "convert your image to 300 DPI" and makes it print-ready is either upscaling it — which invents detail that was never captured — or simply changing the same number this page changes and letting you believe otherwise.

The arithmetic is worth knowing: divide your pixel width by the target DPI to get the printable width in inches. 3000 pixels at 300 DPI is 10 inches. If that is smaller than you need, the file is genuinely too small and the metadata is not the issue.

Nothing is re-encoded

The DPI value lives in a small header — the JFIF segment in a JPEG, the pHYs chunk in a PNG — and this tool rewrites that header in place, leaving the image data byte-for-byte identical. Most online DPI tools decode and re-encode the whole image, which throws away real quality to change a number that has nothing to do with quality. Your file comes back the same format it went in as, at the same pixel dimensions, with the same picture.

It runs in this tab on your own machine, which matters given how often the files people are preparing for print are unpublished artwork or client work.

Questions about Image to New DPI

Will changing DPI make my image sharper?

No. DPI is a note about intended print size, not a property of the picture. The pixels are identical before and after. If the image looks soft in print, it needs more pixels, and no metadata value can supply them.

My printer wants 300 DPI. Is setting it here enough?

It is enough if the image already has the pixels for the size you are printing. Divide the pixel width by 300 to get the printable width in inches — if that is smaller than you need, the file is genuinely too small and the tag will not help.

Does this re-compress my JPEG?

No. Only the small header holding the density value is rewritten; the image data is untouched, so there is no quality loss at all. Tools that decode and re-encode to change this number are damaging your file for nothing.

What DPI should I use?

300 for professional printing, 150 for casual home printing or large posters viewed from a distance, and 72 or 96 for anything shown on a screen. Screens ignore the value entirely, so for web use it makes no difference.

Does DPI affect how my image looks on a website?

Not at all. Browsers display images by pixel dimensions and ignore the embedded DPI completely. It matters only for printing and for layout programs that place images at a physical size.

Why do WebP and GIF files not work here?

They have no standard field for physical resolution. Only JPEG and PNG store a DPI value that software reliably reads, which is why this tool accepts just those two.

Is DPI the same as PPI?

In practice, as used here, yes. Strictly PPI describes pixels in an image and DPI describes ink dots a printer lays down, but the metadata field is universally referred to as DPI and the two terms are used interchangeably.

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