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A quick way to understand who this helps, what it solves, and where it connects next.
People preparing images for print, publishers, and forms that require a specific DPI such as 300
Setting the DPI of a photo or scan for print, or changing an image between screen and print resolution
Capture DPI and print-resolution intent (change image dpi, 300 dpi converter, image resolution converter) with a direct browser-first tool that writes real density metadata
Cleanor Labs
These sections explain the job in plain language and set expectations for what the tool should do well.
DPI (dots per inch) tells a printer how large to print an image. At a fixed pixel size, a higher DPI prints the same image smaller and sharper, while a lower DPI prints it larger. Screens ignore DPI and use pixels directly, which is why an image can look fine online yet get rejected by a print shop or a form that asks for 300 DPI.
This tool writes a real density value into the file: a pHYs chunk for PNG and a JFIF density block for JPG. That is the metadata print software reads. You can keep the original pixels and only change the DPI, or resample the pixel dimensions at the same time. Everything runs locally in your browser, so the image is never uploaded.
Short answers for the questions people usually have before trying a utility like this.
Yes. It is a free online image DPI converter that runs in your browser with no signup and no watermark.
Upload the image, choose the 300 DPI preset (or type 300), and export. The exported PNG or JPG carries 300 DPI in its metadata.
Not by itself. Keeping the original pixels only updates the DPI metadata, which changes the print size. Turn on resampling if you also want to change the pixel dimensions.
No. The DPI is written into the file locally in your browser, so the image never leaves your device.
Every tool on Cleanor is free with no sign-up, no credits, and no limits. Files are processed privately in your browser. Looking for on-device phone cleanup and Premium features? That lives in the Cleanor app.
Upload one image, set the print resolution, and export a PNG or JPG with the DPI embedded.