Is there a way to encrypt/hide image stimuli so that they can’t be found if someone were to hypothetically open the sources in the browser developer tools? If not, is this a feature that could be added in the near future?

Check my crib sheet on how to suppress information going to the Browser console and use arbitrary image file names.

I can’t find in your sheet where it talks about this (I looked at both). Could you maybe give me a section? The images are already arbitrarily named, but I can see them in the ‘Sources’ tab of the developer tools.

Developer Tools Use Developer Tools (Ctl-Shift-I in Windows/Chrome, Cmd-Opt-J or Cmd-Opt-I in Mac/Chrome, F12 in IE/Edge, Ctrl-Shift-J in Windows/Safari, Ctrl-Opt-J in Mac/Safari) to view errors via the browser console if you aren’t getting sufficient information from PsychoPy. You can add print(v…

So this will stop them from being able to open developer tools altogether? I did see this bit, but I thought that was just stopping people from seeing things printed to the console. I’m really glad this is a thing, thanks!

I think it turns off logging not preventing tools being opened. Click on sotiri’s name for more details.

Oh okay. I really need a way to just disable tools or to hide the images in sources (because I can’t have curious participants viewing and/or saving them from sources). It doesn’t seem like there’s a way to do this in web programming at all… The closest thing I can think of is just clearing all reso…

It’s impossible to stop someone taking a photo of their screen, even if you could disable the print screen button. Therefore anything you do will be best effort rather than airtight. Is it easy to find the file names used by PsychoPy via the Browser Console if logging is turned off?

They’re all in a folder in the sources tab of the developer tools window. They’re all given random names and links, so you can click on them and see them. You can find images from any website there as well, so I guess there’s really no way of hiding them. Which is why I was thinking of maybe kicking…

This might help (though possibly not on all browsers) [image] CompletedURL / IncompleteURL Online experiments Thank you for that. Pressing ‘escape’ twice is something that participants would never do, so I think it is a poor trigger for the incomplete URL to be honest. F…

Encrypting experiment images online (feature request?)

Online experiments

wakecarter September 14, 2021, 6:56pm 10

This might help (though possibly not on all browsers)

Topic		Replies	Views
Lots of warnings in the console when running online Online experiments	17	1503	December 16, 2020
Possible to access variables in console while debugging? Online experiments	7	1031	May 12, 2021
PsychoJS log-saving error message cuts off the crucial URL Online experiments	3	413	February 20, 2023
Experiment crases randomly Online experiments	11	183	October 2, 2025
Wakefield's Daily Tips Blog online , pavlovia	119	3852	April 1, 2026

Encrypting experiment images online (feature request?)

Related topics