Optimize & Print
Image DPI Checker
Instantly check the DPI of JPG and PNG images, plus pixel dimensions and the largest sharp print size. Read locally — no upload.
Checked locally — your images never leave your device.
To check an image's DPI, drop JPG or PNG files above — the JFIF, EXIF or pHYs density metadata is read locally, never uploaded. You'll see the stored DPI, pixel dimensions and the largest size each image prints sharply at 300 DPI. Files with no density metadata are flagged, since software assumes 72 in that case.
Honest limits
- Reads JPG and PNG only — the two formats print portals actually check.
- Files without density metadata are reported as such — most software then assumes 72 DPI.
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 images
JPG and PNG files, single or batch.
Read instantly
DPI, pixel dimensions and metadata source are parsed locally.
Check print size
See the largest size each image can print at 300 DPI — and fix it with the Change DPI tool.
Frequently asked questions
Is this safe? Do my photos get uploaded?
No upload happens — ever. Checking 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.
Where is DPI stored in an image?
JPG files carry it in the JFIF header and/or the EXIF XResolution tags; PNG files use the pHYs chunk (stored as pixels per metre). This tool reads all of them and tells you which one it found. If a file has no density metadata, software typically assumes 72 DPI.
My image says 72 DPI — is it low quality?
Not necessarily. DPI metadata says nothing about quality; a 6000×4000 px photo at '72 DPI' contains exactly the same pixels as the same photo at '300 DPI'. What matters for printing is pixel dimensions ÷ print size. The checker does that maths for you, showing the largest print that stays at or above 300 DPI.
Can I check the DPI of multiple images at once?
Yes — drop a whole folder and each file is listed with its DPI, pixel dimensions and largest sharp print size. Checking is metadata-only and local, so even hundreds of images take moments.
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 reading 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.