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Change DPI metadata without adding pixels

Changing the DPI label does not add detail. This converter updates resolution metadata locally, then re-reads the new file to verify the tag before download.

Your file stays on this device. No upload or account required.

Drop an image to check print size

JPEG, PNG, and WebP. TIFF, HEIC, and AVIF are not supported.

Drag and drop, paste, or choose a file. The choose-file control is keyboard accessible.

Your file stays on this device. Nothing is uploaded.

Choose a JPEG, PNG, or WebP image. It stays on this device.

What conversion does

JPEG files keep their compressed pixels and get an updated JFIF density, plus EXIF resolution tags when EXIF is already present. PNG files get a pHYs chunk. Some WebP files can receive an EXIF tag; others are converted to PNG so a resolution tag can be stored. Pixel width and height stay the same.

Common mistakes

  • Expecting a 72 DPI photo to become sharp at 300 DPI without more pixels.
  • Sending a metadata-only change to a printer that ignores density tags and uses pixel count.

Frequently asked questions

Is this image really 300 DPI?

Only if it has embedded resolution metadata set to 300, and even then that number is a label. Effective print resolution is pixels divided by print inches.

What if my image has no DPI metadata?

That is common, especially for PNG and WebP files. The checker still uses pixel width and height to estimate print sizes at 150, 200, 240, and 300 PPI.

Does changing DPI improve quality?

No. Changing the DPI label does not add detail. It only changes how some programs translate pixels into inches.

Which formats can I check?

JPEG, PNG, and WebP. TIFF, HEIC, and AVIF are not inspected here because browser support is incomplete or the files need extra decoders.

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