How do I upload old screenshots taken with traditional methods to Steam?

Take a screenshot in a game with the Steam overlay. When you exit the game, a window will pop up with your recent screenshots for that game. Just click "View on Disk" and it'll open up the screenshots folder (folders are game-specific and named with numbers). Drop whatever pictures you want (Steam uses .jpg, not sure if others will work) in there, but be sure to make a 200x125 thumbnail of the picture in the thumbnails directory or it won't show up. You may have to restart Steam before they show up but you should then be able to upload them like normal.

Sometimes, I have run into issues, where it assigns a random time that the screenshot was taken, if that matters, and I don't yet know how to fix that. Also, you may have to use the same naming scheme as the normal screenshots (year-month-day_#####.jpg - 2011-09-10_00001.jpg, for example).

Saving new files using the naming convention including thumbnails fails for me: the screenshot manager sees them, but uploading reports an error.

However, I was able to open a screenshot captured via Steam and paste the existing screenshot I wanted over it - save and overwrite and it uploads just fine. Not ideal if you want to do many screenshots, though.

1. Take an in-game screenshot with Steam and then exit game. Open the Steam screenshot manager and choose Last Session > View on Disk. (Make sure you don't upload anything.)

2. Find the screenshot you would like to upload and put it in your Steam screenshots folder. (It should have opened from step 1.)

3. Copy the name of the screenshot you took with Steam.

4. Name the screenshot you took with Steam to something temporary.

5. Paste the copied name to replace/rename the picture you want to upload.

6. Close the Steam screenshot manager and then open it again.

Your picture will be available for upload but in the manager; it will look like the one you replaced. Simply select upload and view online and you will see the correct one.

I hope you can find this guide useful. Unfortunately for some games not compatible with Steam overlay this is the only way.

Go to Steam user data folder located in by default in

• C:Program Files (x86)Steamuserdata[xxxxxxxxx]760remote (for 64bit machines)
• C:Program FilesSteamuserdata[xxxxxxxxx]>760remote (for 32bit machines)

[xxxxxxxxx] depend on your Steam ID. 760 is the App ID for Steam Screenshot app.

Now you have to find the Steam App ID of the game you want to upload a screeshot. The easiest way is search the game in Steam Store (http://store.steampowered.com/) and look at the number in browser URL address (e.g. http://store.steampowered.com/app/265610/).

If there is no folder already with the same name as App ID you can create it using these structure.

userdata
+--[xxxxxxxxx]
   +--760
      +--remote
         +--265610
            +--screenshots
               +--thumbnails

So now that you have create the folder structure you just need to save the screeenshot in screenshots folder using this format

YYYY-mm-dd_0000n.jpg

With n start always from 1 for a certain date. Some examples:

2014-08-02_00001.jpg
2014-08-02_00002.jpg
2014-08-03_00001.jpg
2014-08-03_00002.jpg

It is important that the date of the screenshot file match the date you are writing as filename. It is also important that screenshot is JPG.

In addition you have to create a thumbnail of the screenshot and save it in thumbnails folder. You have to use the same name but the width of the image should always be 200px.

Once you have load all screenshot you have to exit Steam and restart it. It could take a while for you screenshot to be shown on the game library, but you can accelerate the process by launching manually the Screenshot management

.

Looks like this is possible in 2020 with SteaScree. Worked great for me.