InDesign Millimetre to Pixels Conversion Anomaly

Question

I annually produce Yearbooks for a client, printed at a finished size of 210 x 210mm.

I am now developing interactive digital versions to supplement these using InDesign and In5. When I convert 210 x 210mm with an online converter, I get 794 x 794px. When I convert the existing print document (through InDesign Preferences / Units) the new document size is 595 x 595px - what is going on?

Converting the metric to digital file sizes consistently is important as I think they will want both formats for a few years to come.

Thanks

rob day · Accepted Answer

What am I doing wrong? Please see the attached screen recording of me converting the file ...

Thanks

InDesign’s Pixel Ruler Unit is a static output dimension of 1/72".

So if you set your rulers to Inch units, your 210mm x 210mm doc will measure 8.2677" x 8.2677", or 595px x 595px — 8.2677*72= 595.2744.

Looks like your online converter was assuming a pixel has an output dimension 1/96"—8.2677*96 = 793.6992

Eugene Tyson · Answer

210mm in px is 794px210mm in pts is 595pts

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