Optimize & Print
Change Image DPI
Set any DPI (72, 150, 300, 600…) on JPG and PNG images without recompressing a single pixel. Runs locally in your browser.
Metadata-only change, done locally — zero quality loss, nothing uploaded.
To change an image's DPI, drop JPG or PNG files above and pick 72, 150, 300, 600 or any custom value — the density metadata is rewritten in your browser with zero upload and zero recompression. Pixels never change; print portals that demand 300 DPI simply read the new value and pass the file.
Honest limits
- JPG and PNG only — DPI lives in format metadata (JFIF/EXIF and pHYs).
- Metadata-only change: pixels are never resampled, so sharpness in print still depends on pixel dimensions.
Need more than a browser can do? Desktop browsers go further than phones — and Media Moana converts at scale on hosted infrastructure.
How it works
Drop JPG or PNG files
Batch works — set a whole folder to 300 DPI at once.
Pick the DPI
Choose 72 / 150 / 300 / 600 or type any value.
Download
Only the density metadata changes — pixels and quality are untouched.
Frequently asked questions
Is this safe? Do my photos get uploaded?
No upload happens — ever. Changing DPI runs entirely inside your browser using WebAssembly. Your files never leave your device, nothing is stored on any server, and the tool even keeps working if you go offline after the page loads. That's also why there are no file size limits, no queues and no sign-up.
Does changing DPI change image quality or size?
No. DPI is just a metadata field — a note telling printers and layout software how many pixels to place per inch of paper. Your image keeps exactly the same pixels; this tool rewrites only the density metadata (JFIF/EXIF for JPG, pHYs for PNG), so there is zero recompression and zero quality change.
Why do print services ask for 300 DPI?
300 pixels per inch is the standard threshold at which printed photos look sharp at normal viewing distance. Many print portals simply check the DPI metadata field and reject files below 300 — even when the image has plenty of pixels. Setting the field to 300 satisfies the check; whether the print actually looks sharp depends on the pixel dimensions (e.g. 3000×2400 px prints sharply at 10×8 inches).
What DPI should I choose?
300 for photo printing and most submission portals, 150 for large-format posters viewed at a distance, 72 or 96 for screen-only use. If a portal told you a specific number, use exactly that.
Can I change the DPI of multiple images at once?
Yes — set a whole folder to 300 DPI in one pass. Each file gets only its density metadata rewritten, locally, so even big batches finish in seconds and download individually or as a single ZIP.
Is there a file size or quantity limit?
There is no hard limit. Server-based converters cap uploads because your files consume their bandwidth and CPU; here rewriting density metadata happens on your machine, so the only practical limit is your device's memory. Desktop browsers comfortably handle very large files and big batches.