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I just tried to make a post on another StackExchange site, but unfortunately, when I tried to take a picture of the problem, I got an error that the image must be less than 2 MB to upload it to StackExchange! The edit button on my Android photos app lets me draw over, crop, change tint/brightness/contrast, and add lots of WACKY EFFECTS to my pictures, but I can't figure out how to shrink the resolution! Thanks in advance.

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I'm not aware of any "native" or "pre-installed" capabilities. But the easiest way, if you need it more than once a year, is to use a suitable app. You can find some candidates in my app-listing Other photo editors. Examples:

  • JustResizeIt! allows to resize single images or entire batches. Comes for free, size less than 1MB, decent permissions (access storage and internet only).
  • Image Shrink Lite is even smaller (less than 400k), and additionally allows you to remove Exif data (location etc.) No network permissions requested, just read/write storage. Free again.

Both mentioned apps also have paid counterparts; I didn't check the differences between those versions. For more candidates, see the list linked above :)

  • The 2nd one works really easily, thanks! I can just select upload from Image Shrink Lite, then select the image, then it uploads the shrinked version right away! Awesome! – Aaron Franke Nov 25 '16 at 21:55
  • I can recommend my app Resize image, free, no size limit, decent permission requests and share capability. – Briefkasten Dec 29 '18 at 8:14
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Easey peasy. Search online for resize tools. I'll give you a random one...

http://www.picresize.com/

Upload your image and select the resolution you want to get.

  • That requires to upload the picture twice: full resolution (to the resizer), reduced resolution (to SE). Plus downloading the reduced resolution from that site. Needs to be considered concerning bandwidth and data plan :) – Izzy Nov 25 '16 at 9:50
  • @Izzy Well another solution would be to download one of the android apps who handles this type of problems :) On other hand, it also needs bandwidth and data to download the app. So, it's up to user on which side he wants to lose or gain :) Online - flexibility, use when you need, also takes data. App - fast/reliable, but takes space on device. – FiN Nov 25 '16 at 9:55
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    You download the app once. See my answer: 400k, one time only. Already bandwidth saved on the first image resized from 2M to 500k :) – Izzy Nov 25 '16 at 10:07
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i'm not sure if this is the right thing for you but from time to time i use Send Reduced:

once you have done your settings in the app, you can resize images by just using the share button and "share it via"/"send it to" Send Reduced. no extra interface, settings or other junk you have to consider... just resizing.

share picture via

it is very handy if you use the same resolution for the most of the pictures you want to resize, and also for batch-resizing it is quick and easy.

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