DPI (dots per inch) tells you how large an image will print before it looks pixelated. This tool reads the DPI stored in your file and works out the physical print size from the pixel dimensions.
The file is read in your browser, so nothing is uploaded.
How to use DPI Checker
Using DPI Checker takes only a few seconds and just four simple steps — no sign-up, no software, and nothing to learn:
- Upload an image: Add a JPG or PNG file to inspect.
- DPI is read: The tool extracts the resolution from the file's metadata.
- Review: See the DPI, pixel dimensions, and resulting print size.
- Adjust if needed: Use the Set DPI tool to change it for printing.
What you can do with DPI Checker
DPI Checker is built to do one job well, and gives you everything you need to get it exactly right:
Reads real metadata. Pulls DPI from JPEG JFIF and PNG pHYs data.
Print-size estimate. Shows the size in both inches and centimetres.
Instant and private. The file is parsed locally in your browser.
Free, no sign-up. Check as many images as you like.
Know before you print
Printing an image at too low a DPI gives a soft, blocky result. Checking the resolution first tells you the largest size it can print cleanly, so you avoid a wasted print run.
Whether you need it once or every day, DPI Checker keeps the process quick and predictable. Because it focuses on a single task, there are no crowded menus to wade through — you open the page, set what you need, and get your result. That simplicity is exactly why a dedicated image tool beats a heavyweight editor for a job like this.
Everything runs in your browser
Unlike most online tools, DPI Checker never uploads your image to a server. The moment you choose a file, it is processed right here in your web browser using your own device's power. Nothing is sent over the internet, nothing is stored, and nothing is shared with anyone.
That gives you two real advantages. First, it is private: sensitive documents, ID photos and personal files never leave your computer or phone. Second, it is fast — there is no slow upload or download round-trip, so even large files are handled almost instantly. And it is completely free, with no watermark added to your result and no account required.
Tips for the best results
- Start from the highest-quality original you have — the better the input, the better the result from DPI Checker.
- Check the exact requirement — size, dimensions, or format — before you begin, so you only need to do it once.
- Reads real metadata: Pulls DPI from JPEG JFIF and PNG pHYs data.
- Print-size estimate: Shows the size in both inches and centimetres.
- Everything is repeatable — if the result isn't quite right, just adjust the settings and run it again. Nothing is uploaded, so you can try as many times as you like.
Frequently asked questions
What if my image shows 72 DPI?
72 is the default assumed when a file has no resolution metadata. The pixels are unchanged — you can set a print DPI with the Set DPI tool.
Does DPI affect on-screen display?
No — screens use pixel dimensions. DPI only matters for printing.
Is the image uploaded?
No, it's read entirely in your browser.
Is DPI Checker free to use?
Yes — DPI Checker is completely free. There is no account to create, no subscription, and no watermark added to your result. Use it as many times as you need.
Do I need to install anything?
No. DPI Checker runs entirely in your web browser on any modern device — Windows, Mac, Android or iPhone. There is nothing to download or install.
Ready to start? Scroll back to the top, drop your image into DPI Checker, and download the finished file in seconds — free, private, and right inside your browser.