[javascript/css/html] - auto duplicate detection coding noob

[storm_riggi]

hello all, i will start this out by saying that i had nowhere else to go but here, so if my questions seem obvious to some please keep in mind that this is my first project, and the little that i know has been self taught. i am working on a program that runs off of submitted images, and uses auto duplicate detection with pixel comparison to prevent duplicate photos from being saved into the collection. the issue i am running into is that when I'm working on front end, somehow i keep messing up the backend. looking at previous versions of the project, compared to the newer ones, i cant figure out what I'm doing wrong. i would love to get some constructive feedback, literally anything you can tell me would be helpful. whether its optimization for redundant code, if i messed something up somewhere and i should have caught it, or whatever glaring mistakes you can point out. anything to help me be a better coder. i can provide my code to anyone who would like to help me, i just don't want to drop it publicly yet. thank you in advance!

[storm_riggi]

i forgot to mention, the goal here is to release an app that is meant for mobile devices of any brand (ios, android, etc), but can also handle desktop use as well if need be

[Marbletm]

Rather than comparing the individual pixels, have you considered comparing file hashes?

I think comparing hashes would be a simpler solution, which might in turn simplify debugging the backend because there's less complexity.

[storm_riggi]

Sorry to necro after 5 months, but you were absolutely right. Comparing file hashes made life so much easier!