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Image DPI Converter

Set image DPI to 72, 150, 300 or any custom value. Writes real density metadata — JFIF for JPG, a pHYs chunk for PNG — and can resample in the same pass.

Add your images

Sets the density a printer reads. Choose JPG or PNG as the output — WebP has no DPI field.

Up to 50 files at a time · nothing is uploaded, every image is processed on your own device

Settings

300 DPI is the standard for print. Raising DPI alone does not add detail; use the size box to resample as well.

Accepted everywhere. No transparency — it is flattened onto white.

dots per inch

Written into the file's metadata. 300 is the print standard.

82

80–85 looks identical to the original for most photographs.

Maximum dimensions

Optional. Images already smaller than this are left at their own size.

px
px

About setting image DPI

DPI is a note stored alongside the pixels that says how densely they are meant to be printed. It is what a layout application reads to decide how large to place an image, and what a print supplier often checks before accepting a file.

This tool writes that value properly — a JFIF density header for JPG, a pHYs chunk for PNG — rather than relying on software to infer it. It can also resample in the same pass when the pixel count needs to change too.

When this is the right tool

  • A printer, publisher or client asked for 300 DPI and your file is tagged something else.
  • An image is landing at the wrong size when placed in a layout document.
  • You are preparing a set of files for print and want the tag consistent across all of them.
  • You are not sure whether you need a tag change or more pixels — this settles it.

How to use it

  1. Work out what you actually need

    Multiply the finished print size in inches by the density asked for. That is the pixel count required — if you have it, a tag change is all you need.

  2. Drop in the images

    All three formats are accepted as input. Choose JPG or PNG as the output: WebP is selectable but has no density field, and the tool says so rather than pretending to write one.

  3. Choose the DPI

    72, 96, 150, 300 and 600 are one click; any value from 1 to 2400 can be typed. 300 is the usual answer for print.

  4. Resample as well, if you need to

    Add maximum dimensions to change the pixel count in the same pass. Leave them blank to change only the tag and leave every pixel alone.

Formats and limits

Input
JPG, PNG and WebP.
Output
JPG, PNG or WebP — but only JPG and PNG can carry a density value. Choose WebP and the tool says so rather than writing a tag that does not exist.
DPI range
1 to 2,400, with presets at 72, 96, 150, 300, 600.
Other metadata
Only the density is written. Re-encoding drops EXIF, IPTC and XMP, so a file that carried copyright or capture data loses it — what each of those holds.
Batch, limits and privacy
Up to 50 files per run at 50MB each, all processed with the same settings and returned as one ZIP. No watermark, no daily cap and no sign-up — and no upload either: every file is decoded and re-encoded by your own browser.

Common questions

Does changing DPI change image quality?

On its own, no. DPI is metadata telling a printer how large to print each pixel — it does not add or remove any. What it changes is the physical size of the print: the same 3000px image is 10 inches wide at 300 DPI and 41 inches at 72.

Why can I not set DPI on a WebP?

The WebP container has no density field at all. Choose JPG or PNG as the output format and the value is embedded properly; pick WebP and the tool tells you rather than silently dropping it.

How do I actually resample to 300 DPI?

Work out the pixels you need — inches × DPI — and enter that in the maximum dimensions box alongside the DPI value. An 8×10 inch print at 300 DPI needs 2400 × 3000 pixels.

Guides on this

Longer answers to the questions this tool raises.

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