pixel size for posting

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Hey Everyone I have a question regarding prepping photos for posting on the internet to thwart theft using Affinity. I hate watermarks and fully understand that the only real way to prevent theft is not to post on the internet in the first place. When I hit export option a window opens up for converting to jpeg that looks like this  

Size:  ___px   by    ___px

Preset:      Jpeg quality

Resample:   Bilinear

Quality :   slider    85

Area:   whole document

Don't export layers hidden by Export persona

Estimated file size:    3.86mb



What do you guys/gals enter for this option for posting on the net? What dpi is good for optimal viewing on the net but at the same time not optimal for printing if it's stolen?



Thanks in advance

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Hi Hson278,

Welcome to Affinity Forums :)

The DPI is irrelevant for web. The only thing you have to care about (regarding unauthorised use of your photos) is the image size in pixels (and compression). If you post a large image, lets say for example 3000 x 2000 px (I'm exaggerating a bit on purpose), and set the dpi to 300 it will have 25.4 x 16.9 cm. If you reduce the DPI a little (let say to 200) you can still get a relatively high quality print at an even larger size (38.1 x 25.4 cm) - there's other factors that are important here like the paper type, printer's resolution, resampling etc but i'm not covering those here). Reducing the longer side to somewhere between 600 and 800 pixels will limit the print size considerably (800 px translates to 7,6 cm at 300 dpi on the longer side). You can also compress the file a little to reduce the quality even further. But as you can see it's all a bit relative and depends on how much you are willing to restrict the quality of the print.

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This tends to be what I go with - 1200 x 800 px in theory, but sometimes it rounds down to 799: I just put 1200 in the long side and lock the proportions.




I set the Quality slider to whatever it needs to be at to give me a file of around 300kb.


In quality terms it gets you something like this (although knowing how to take a decent picture in the first place; and knowing how to convert and process Raw files well, matter too):






As MEB says, DPI is irrelevant for online viewing.

Alfred and MEB like this

Keith Reeder


(I don't need bird photography lessons - OK..?)

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Wow, gorgeous images Keith!


What he said!  B)

Alfred online2long.gif
Affinity Designer (, beta Photo (, beta • APh for iPad 1.6.3 (but no iPad  yet!)

Windows 10 Home4th gen Core i3 CPU

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Please note that there is no "safe" or secure means to protect your images. If someone wants them, they can generally be resampled using better technology that is typically built into an photo editing application and even your (nice looking) watermark can be removed. And the better the images, the better the resizing/resampling that can occur.


I used a free application to resize/resample your image of the squirrel (great shot,, btw). I have better ones available. Point is, it is now filling a letter-size document, landscape orientation (so 11" wide). Do note the actual and effective resolution in the screen shot. And your watermark is removed.




As I know photographers get antsy about such demonstrations, I have deleted the images. I did this to make a point.


I do a lot of font work at various times. But it is mostly work for others. I have been sitting on several families to be released under my own name for months. Why? Because I know they are going to be ripped off, it's just a matter of how long. For one of my font customers, the shortest time before it hit the wild was two weeks.


This crap weakens a brand and hence revenue. But it is a fear I need to overcome. Point is, one or more of your images will be ripped off if shown on the web. there is no good means of preventing that.



My computer is a nothing-special Toshiba laptop with unremarkable specs running Windows 10 64-bit.

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Thanks, guys - this is the quality I aspire to (the squirrel is a completely wild animal, incidentally - this is where fieldcraft comes in) and - as an aside - I wouldn't use Affinity Photo as my image processing software unless it was entirely capable of delivering on my aspirations. Which it certainly is..!




Please note that there is no "safe" or secure means to protect your images. 


This, 100%. 


I don't even try to protect my images. Yes, I've had images ripped off/presented as someone else's work - umpteen times - and it's just a crappy aspect of the internet you deal with either by accepting it as the price of entry, or by not posting images online.   


I suppose I'd feel different if this was my living, of course...


could make removing my name harder to remove by sticking it right across the subject matter, but I think it spoils the experience (I hate seeing it in other people's images), and it's still a far from foolproof method if an image thief is sufficiently motivated and reasonably able to use certain image editing tools.

Keith Reeder


(I don't need bird photography lessons - OK..?)

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