Steps
How to convert image DPI
- Open the tool and choose, drop, or paste a JPG or PNG image.
- Check the current DPI report and confirm the original pixel dimensions.
- Select a preset such as 300 DPI, or enter a custom target value.
- Download a copy with updated metadata and unchanged pixels.
What changes and what stays the same
DPI conversion here changes the resolution tag stored in the file. It does not create new detail. A 1200 x 1800 px image remains 1200 x 1800 px after you download it.
| Item | Metadata-only converter | Why it matters |
|---|---|---|
| DPI tag | Changed | Helps tools read the intended print density. |
| Pixel dimensions | Unchanged | Keeps the original image detail and file geometry. |
| Image quality | Not improved by the tag alone | Sharper output requires enough pixels for the print size. |
Supported formats
JPEG and PNG are the practical first targets for browser-side DPI conversion. The tool updates JFIF or EXIF density data for JPEG files and pHYs density data for PNG files.
- Use the JPG DPI page when the file is a photo, scan, or compressed image.
- Use the PNG DPI page when the file has transparency, screenshots, artwork, or flat graphics.
- Use the checker when the file can be previewed but the browser cannot safely rewrite its DPI metadata.
Verify after conversion
After downloading, check the file in Windows Properties, macOS Preview Inspector, Photoshop, or a layout app. Confirm both the DPI value and the pixel dimensions, because a correct DPI tag should not change the original width and height.