Free 300 dpi converter

Drop the picture and it comes back saying 300 dpi — the number is already filled in. You can also fix the printed size in centimetres, so the result is exactly what the form asks for rather than merely close. Nothing is uploaded: the work happens inside your browser, on your own device.

How to use it

1. Drop the photo or signature JPG, PNG, WebP and HEIC all work, and several at once is fine.
2. Type the resolution 200 and 300 are one tap away. The line underneath shows what the file says now and what it will say afterwards, with the printed size in centimetres.
3. Choose what should change Writing only the number keeps every pixel and changes the printed size. Keeping the printed size resizes the pixels instead. The third option gives you an exact size in centimetres at that resolution — what a form like CCC means by "3.5 × 4.5 cm at 200 dpi".
4. Save it Add a KB limit if the form has one, and the result is compressed to fit with the resolution still written in.

Questions

How do I make an image 300 dpi?

Drop it above — 300 dpi is already set — and press the button. The number is written into the file, not just displayed, so whatever checks it reads 300.

Why 300 dpi?

It is the usual requirement for printing and for office documents.

Can I also set the size in centimetres?

Yes. Choose "Make it an exact printed size", type the centimetres the form states, and the pixel count is worked out for you at 300 dpi.

Can I keep it under a KB limit too?

Type the limit in the max file size box. The picture is compressed to fit and still carries 300 dpi.

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