Setting the DPI changes how big an image prints without touching its pixels. Print shops and document specs often ask for 300 DPI; this tool writes the DPI value you choose into the file.
The change is made in your browser and the image content stays exactly the same.
How to use Convert Image DPI
Using Convert Image DPI takes only a few seconds and just four simple steps — no sign-up, no software, and nothing to learn:
- Upload an image: Add the JPG or PNG you want to set the DPI on.
- Enter the DPI: Type the target resolution, such as 300.
- Apply: The DPI metadata is written into a fresh copy of the file.
- Download: Save the image with its new DPI.
What you can do with Convert Image DPI
Convert Image DPI is built to do one job well, and gives you everything you need to get it exactly right:
Any DPI value. Set 150, 300, 600 — whatever the spec requires.
Pixels untouched. Only the print-resolution metadata changes.
JPG and PNG. Writes JFIF density or a PNG pHYs chunk as appropriate.
Free and private. Processed locally with no watermark.
Hit a print-resolution spec
When a printer or form demands a specific DPI, the fix is metadata, not resampling. This tool sets the value cleanly so your file reports the resolution required — without degrading the image.
Whether you need it once or every day, Convert Image DPI 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, Convert Image DPI 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 Convert Image DPI.
- Check the exact requirement — size, dimensions, or format — before you begin, so you only need to do it once.
- Any DPI value: Set 150, 300, 600 — whatever the spec requires.
- Pixels untouched: Only the print-resolution metadata changes.
- 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
Does changing DPI make my image sharper?
No — DPI doesn't add pixels. To print larger at high DPI you need more pixels, which means a higher-resolution source image.
Will the file look different on screen?
No, on-screen appearance is unchanged. Only the printed size is affected.
Which formats are supported?
JPG and PNG. The correct metadata field is written for each.
Is Convert Image DPI free to use?
Yes — Convert Image DPI 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. Convert Image DPI 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 Convert Image DPI, and download the finished file in seconds — free, private, and right inside your browser.