This free image DPI changer lets you convert JPG or PNG to 300 DPI online — lossless, instant, and private. Check the current DPI of any image, set a new value, and download without uploading files.
Target DPI
Drop images here, or click to browse
JPG & PNG · up to 50 files · checked & converted instantly, never uploaded
Use this built-in calculator with the image DPI changer to see print size at a target DPI, or how many pixels you need for a given print dimension.
Pixels → print size
10.00 × 6.67 in · 25.4 × 16.9 cm
Print size → pixels
3000 × 2001 px
Private by design: your images are processed locally and never uploaded.
DPI (dots per inch) is metadata that tells printers how densely to place your image's pixels on paper. A 3000×2000 px photo contains exactly the same pixels at 72 DPI and at 300 DPI — the only difference is the intended print size. This image DPI changer rewrites the resolution fields (JFIF & EXIF for JPG, the pHYs chunk for PNG) and leaves every pixel byte exactly as it was.
| Print size | Pixels needed @ 300 DPI | Common use |
|---|---|---|
| 4 × 6 in (10×15 cm) | 1200 × 1800 | Standard photo print |
| 5 × 7 in (13×18 cm) | 1500 × 2100 | Portrait print |
| 8 × 10 in (20×25 cm) | 2400 × 3000 | Framed photo |
| 8.5 × 11 in (US Letter) | 2550 × 3300 | Documents, KDP interiors |
| A4 (21 × 29.7 cm) | 2480 × 3508 | Posters, printables |
Drop any JPG or PNG into the DPI changer and see its existing DPI metadata before you convert — doubles as a free DPI checker.
Only the DPI fields are updated. Pixel dimensions, file quality, and visual appearance stay identical.
One-click targets for 72, 96, 150, 200, 300, and 600 DPI — plus any custom value your print shop requires.
Convert a whole folder of images and download them all as a ZIP — still 100% local in your browser.
Drop JPG or PNG files above. The current DPI of each image is detected and shown instantly.
Pick 300 DPI — the print standard — or 72, 150, 200, 600, or any custom value.
Click Download. The DPI metadata is rewritten losslessly on your device — pixels untouched, nothing uploaded.
Drop your JPG or PNG into the image DPI changer above, select the 300 preset, and click Download. The DPI metadata is rewritten directly in your browser — free, instant, no watermark.
Not here. This tool only rewrites the DPI metadata (JFIF/EXIF for JPG, pHYs for PNG) and never re-encodes your pixels, so quality is 100% preserved.
No. The pixel dimensions and file size stay essentially identical. DPI only tells printers how densely to place those pixels on paper.
Drop the image into the tool above — its current DPI is displayed instantly before any conversion.
300 DPI is the standard for high-quality photo and document printing. 150 DPI works for large-format posters viewed from a distance; 600 DPI is used for fine line art.
72 DPI is a legacy screen convention; 300 DPI is print density. A 3000×2000 px photo prints at 10×6.7 in at 300 DPI, but at 72 DPI it's interpreted as 41.7×27.8 in — same pixels, different printed size.
Yes. PNG stores print density in its pHYs chunk, and this tool writes it losslessly — just like the JFIF and EXIF resolution fields in JPG files.
Never. Everything runs locally in your browser with JavaScript — files never leave your device.
