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Change Image DPI Online

Print services and submission portals often require '300 DPI' images. DPI is just a metadata note telling printers how densely to print the pixels — so Filesvo rewrites exactly that note and nothing else. Your pixels are untouched and quality is bit-for-bit identical.

or drag and drop JPG/PNG files here — you can also paste from the clipboard

Processed on your device — files are never uploaded to Filesvo.

Convert an image to 300 DPI — Set the tag in one step, and see the pixel dimensions a sharp 300 DPI print actually needs.

How to use Filesvo

  1. Select or drop JPG or PNG files.
  2. Pick a preset (72, 150, 300 or 600 DPI) or type a custom value.
  3. Click Change DPI and download — each file shows the DPI it declared before, when it declared one.

What DPI actually is

DPI (dots per inch) tells printing software how large to render an image on paper: a 3000-pixel-wide photo at 300 DPI prints 10 inches wide, and the same file at 150 DPI prints 20 inches wide. The pixels themselves are identical in both cases — DPI is an instruction, not a property of the image data.

Filesvo edits only the density fields: the JFIF and EXIF resolution entries in a JPG, and the pHYs chunk in a PNG. No decoding or re-encoding happens, which is why this change is truly lossless — most online 'DPI converters' quietly re-compress your image; this one doesn't.

Private by design

Your files are processed directly in your browser using the browser's built-in image APIs and are not uploaded to Filesvo. Nothing is stored on our servers, because nothing ever reaches them.

Frequently asked questions

Does changing DPI make my image sharper or larger?
No, and any tool claiming it does is misleading you. Sharpness comes from pixel count. Changing DPI only changes the intended print size. If a service demands both '300 DPI' and specific pixel dimensions, set the DPI here and use the resize tool for the pixels.
Is there really no quality loss?
Really none. The image data bytes are copied through untouched — only the few metadata bytes holding the density values are rewritten. For JPG this covers both the JFIF header and, when present, the EXIF resolution tags, so viewers that read either one agree.
What DPI should I choose?
300 DPI is the standard for quality photo printing and is what most portals ask for. 150 DPI suits large-format posters viewed at a distance, and 72 DPI is a web-era convention with no practical effect on screens.
Why only JPG and PNG?
These are the two formats with a standard, widely-respected place to store print density, and the ones print portals ask about. WebP has no equivalent standard field that print workflows read.

Related Filesvo tools

Resize Image

Resize JPG, PNG and WebP images by percentage or to exact pixel dimensions — in your browser.

Image Metadata Viewer

View EXIF data hidden in your photos — camera, settings, dates and GPS location — privately in your browser.

Compress Image

Reduce JPG, PNG and WebP file sizes in your browser with adjustable quality and honest before/after numbers.