What features of Stack Exchange sites do you consider "hidden"?


57 Answers 57


Attached Firefox/Internet Explorer search plugin. In Firefox, when you are on Stack Overflow, just click on the search dropdown (to the left of the search text field) and hit Add "Stack Overflow".

EDIT: SO-family sites now also support OpenSearch, as described in this question.

  • Does this only work on Windows? It doesn't work on the ancient version of Firefox on my CentOS box. Oct 7 '08 at 19:29
  • 2
    It has to support the "manage search plugins" option, and have discovery working. I'm using Firefox 3.0.2 on Fedora 9, so it definitely works under linux. It may just be that your version of firefox doesn't autodiscover.
    – akdom
    Oct 7 '08 at 19:31
  • Take a look a the originating post stackoverflow.com/questions/20830/… . You will need to adjust it since that was for beta.stackoverflow.com (if it doesn't still work). But you can manually add it with that.
    – akdom
    Oct 7 '08 at 19:33
  • 11
    In Opera, you can right click on the SO search box and click "Create Search" to add it to your list of search sites. Jan 1 '09 at 2:52
  • 4
    Cool, but nowhere near hidden. Lots of sites have this (more should!). And you can add sites yourself easily by generating the needed XML by searching a site for TEST and entering the resulting URL into microsoft.com/windows/ie/searchguide/en-uk/default.mspx
    – peSHIr
    Jan 22 '09 at 13:31
  • 1
    It get's better if you assign a keyword to StackOveflow as search engine for Firefox (e.g. "so"). You can then type something like "so python+hidden" directly as URL into Firefox.
    – Cyberdrow
    May 23 '09 at 12:05
  • 1
    Bookmark for quick search in FF/IE (or search engine shorcut in chrome) is, for searching: stackoverflow.com/search?q=%s or for taggeg questions: stackoverflow.com/questions/tagged/%s
    – streetpc
    Jun 16 '09 at 17:16
  • 1
    Cool - I just noticed in IE that the little drop down next to teh search box turns slightly orange when you're on this site. Sweeeet. Jun 16 '09 at 17:19
  • @Chris or on any other search box, for that matter. Aug 14 '10 at 14:47
  • It's also there in the Brave browser. With appropriate settings, I can type so: whatever-I-want-to-look-for in my search bar and it shows me StackOverflow posts.
    – user392547
    Aug 17 '18 at 4:52

If you need to tell someone to do keyboard commands you can use the kbd HTML tag.


<kbd>Ctrl</kbd> + <kbd>Alt</kbd> + <kbd>Del</kbd>


Ctrl + Alt + Del


Clicking on Days Visited or Consecutive Days on the profile page

clicking on Days Visited

opens a calendar that shows which days the site was actually visited.

shows a calendar

  • Nice! Never tried that. Good one. Nov 8 '10 at 12:59
  • 3
    @Gabriel - também gostei do calendário e valeu um Badge para mim (I also like the calendar and I got a badge for it) :-) "You've earned the Necromancer badge for Hidden features of Stack Overflow" - this message is great too, just right for Halloween!
    – user141148
    Nov 8 '10 at 20:02
  • 1
    Gaaah, just WHY are half of these features so damn hidden? I know why, Jeff likes hide & seek!...
    – RomanSt
    Jan 29 '11 at 22:30
  • 10
    It already says I visited tomorrow. Now I am tempted to stay off tomorrow to create a space time paradox. Either that or the official time zone is different than my local time, but where's the fun in that? Jan 30 '11 at 4:37
  • I was on my 97th consecutive day when I forgot to visit stackoverflow.com ... almost got my fanatic badge...
    – Marlon
    Jan 30 '11 at 12:31
  • 1
  • yeah me too marlon :((
    – gsharp
    Aug 12 '11 at 13:38
  • Okay I actually discovered this by accident when I was trying to find out why my counter was reset...silly me for missing a day
    – prusswan
    Jan 25 '12 at 20:17
  • 5
    FYI: Your OpenID is actually still readable in this answer.
    – user206222
    Dec 1 '13 at 15:43
  • 2
    This doesn't seem to work anymore... Mar 12 '20 at 21:30
  • @user141148 Nevermind, it does work. It seems to only work for your own profile, though. Mar 13 '20 at 10:34
  • 1
    @SolomonUcko This feature is definitely gone now.
    – Tsundoku
    Jan 7 at 19:44


Displays all the votes (negatives and positives) you have had, and the question where you've got them.

Also display how much reputation was earned from suggested edits.

Source: Jeff’s answer here

  • 1
    @ShaWizDowArd used to be correct, but due to changes since his comment was posted, /reputation no longer has any effect on your reputation, it simply displays what you currently have. May 7 '13 at 13:48
  • 1
    @Richard as far as I know, it's still possible to recalc and it's still making changes in rare cases where it wasn't updated automatically. IMO this answer should stay. See here a related post. May 7 '13 at 14:23
  • @RichardJ.RossIII I stand corrected, they removed the button. :( Jan 1 '14 at 14:37

URL tooltips

**[URL tooltips][1]**

  [1]: https://stackoverflow.com/editing-help
        (Check "Advanced Links" paragraph)

Inline URL tooltips

Inline [URL tooltips](https://stackoverflow.com/editing-help "Check "Advanced Links" paragraph")
  • 13
    talk about hidden, I'm going to use this in every post now just to show it to people who edit them. Jul 25 '10 at 23:37
  • I didn't know how to do that in markdown until now. I always used an html <a> element with a title attribute. Mar 19 '13 at 9:17
  • How the hell can you just nest double quotes without the world immediately collapsing?
    – dim
    Jan 27 '20 at 12:24
  • @dimlostfaithinSE by the power of stack we will prevail!
    – HuBeZa
    Jan 27 '20 at 12:36

You can see the history of what happened to a post (question and answer) by going to:


In the details that are shown, a lot can be clicked to expand.

This also works on Area 51.

2020-01-16 update: This has been implemented as a site-wide feature.


There was once a hidden feature in the /about page but was removed somewhere in 2021 as part of making SE sites look less fun more professional. For details, read below.

While in the /about page aka guided tour of any site (e.g. [Stack Overflow about page](https://stackoverflow.com/about)) in the network, press the following keys in the following order: upupdowndownleftrightleftrightbaenter. This is known as Konami code, and will cause the site icon on top of the page to become the [Stack Exchange Venn Euler diagram](http://i.stack.imgur.com/tC8as.png).

If on mobile device, the following should work: tap-drag up, tap-drag up (,down,down,left,right,left,right), and then tap thrice.

Kudos to Geoff for revealing the existence of that easter egg. :)

  • 22
    Do you randomly test the Konami code in websites? :D Jul 3 '13 at 13:05
  • 2
    @fedorqui now I do, lol! But see the last sentence, Geoff posted answer calling us to action... so I viewed the source code, noticed the Konami and the rest is history! :-) Jul 3 '13 at 13:07
  • Oh my... and here I thought that it was just me, when I searched "xyzzy" (but sadly, no Easter Egg) a little while ago! ;-) Jul 20 '16 at 4:56
  • 1
    @Charles lol, amazed it's still working... though wasn't able to do it on mobile. Guess my fingers are too fat. :( Jul 20 '16 at 9:13
  • 2
    Not working anymore?
    – ashleedawg
    Apr 13 '18 at 0:37
  • 3
    @ashleedawg sorry about it, they changed from B, A to b, a at some point (made it small case), forgot to edit the answer. Try now. Nov 26 '18 at 15:27
  • It doesn't work?
    – S.S. Anne
    Mar 12 '20 at 21:05
  • @S.S.Anne still working for me. What OS/browser? Mar 13 '20 at 16:11
  • Chrome OS 80 Chrome 80. I was doing it on /help.
    – S.S. Anne
    Mar 13 '20 at 16:14
  • @S.S.Anne so maybe it's borked on Chrome OS... it's a very old (hidden) feature, added way before that OS existed. so it won't be surprising. :( Mar 13 '20 at 16:15
  • 1
    I was doing it on /help, not /about. It works.
    – S.S. Anne
    Mar 13 '20 at 16:15
  • Doesn't work for me, WIndows 10 Firefox 78.0.2. :( I guess I was too late to the party.
    – JamesA
    Oct 2 '21 at 5:04
  • 1
    @JamesA yeah, pity. They now remove all old stuff. Oct 2 '21 at 16:46

Navigate to the last modification of a post

enter image description here

  • 4
    This is probably the awesomest of all things I have learned today.
    – jmac
    Oct 3 '13 at 7:06
  • 4
    Wow... you're telling me that I could have been doing this instead of doing CTRL-F and typing "ago"? :O
    – Doorknob
    Dec 1 '13 at 17:06
  • 9
    Sorry, what exactly is this referring to? I can't find this.
    – Kerrek SB
    Jan 1 '14 at 16:39
  • 3
    @KerrekSB check at the right sidebar of any question: i.stack.imgur.com/dAsv9.png
    – muru
    Aug 4 '17 at 4:32

You can see recently completed features on Meta Stack Exchange. There is also a formally-maintained list.

  • if only we could hide everything that's not a feature, like retags. Jul 25 '10 at 23:35
  • 1
    Good point. Updated the link so it only shows questions tagged status-completed and feature-request. Jul 26 '10 at 15:06
  • 6
    And when noticing changes: consider adding them to the community maintained Recent feature changes to Stack Exchange.
    – Arjan
    Jan 31 '11 at 16:03

If you have 1000+ reputation, you can click the score of a question/answer and expand the net value to see the total of upvotes vs total of downvotes


  • Good addition. I wonder how casual users will discover this feature.
    – jjnguy
    Dec 1 '09 at 18:06
  • Well, how will the 1k rep users who don't visit meta discover the feature?
    – jjnguy
    Dec 1 '09 at 18:39
  • I think the low publicity is intended, Jeff was against this
    – juan
    Dec 1 '09 at 18:59
  • 10
    By misclicking (with the intention to vote). I just discovered it half an hour ago on SO... and wondered why it wasn't working on my meta account, until I found this.
    – splicer
    Dec 1 '09 at 19:01
  • @splicer, a good reason to upvote this post!
    – juan
    Dec 1 '09 at 19:10
  • @Juan: yeah, you're right. done ^^
    – splicer
    Dec 1 '09 at 19:19
  • @Justin Nelson, it's listed on the sitename.com/faq page. Granted, explicit instructions aren't provided, but a simple mouseover does the trick.
    – Pops
    May 20 '10 at 20:25
  • 2
    @popular kind of wondering but what's the reason for needing 1k rep to use this feature?
    – greatwolf
    Jan 29 '11 at 10:12
  • @Victor, you'd have to ask a developer for an official answer, but I think they once said it was to prevent too many database accesses.
    – Pops
    Jan 29 '11 at 19:26
  • 1
    @Victor Popular Demand is right, see this answer by Jeff. Jan 1 '13 at 11:24

The nofollow attribute on your profile website link is removed at a rep of 2000.

Jeff's answer

  • 3
    Also mentioned in the podcast, episode 15 (2011-08-10, 30.1 MB, episode 100 in the old numbering scheme) at 43 min 00 secs. Aug 12 '11 at 14:21

Wildcards in tag filters

Adding *C#* to your ignored tags will ignore any tag that contains the letters C#, including C#-4.0 and visual-C#-express-2010. Likewise for favorite tags.

This is useful because there are often questions tagged C#-3.0 but not C#, so just ignoring C# wouldn't catch this. Its a really nice solution to ignoring all questions on a given topic.

You can even use it to ignore all questions not in your favorite tags by just ignoring * :D

  • Single most useful feature I've seen yet. I don't know why I didn't think to try that!
    – Chipster
    Dec 29 '19 at 3:21

I recently learned that the Your Question/Your Answer editor has an auto-indent feature (in source code blocks): Try Shift+Enter.

  • 39
    Actually Shift+Enter is a continue formatting command: I.e. it doesn't continue extra indenting within code, but it does add the first 4 needed spaces if you're already in code. It also adds the next numeric value for a numbered list, a copy of the first mark for an unnumbered list, and for both of the latter it "fixes" the other numbers/marks to be sequential/the same. It also continues > blockquotes.
    – Mark Hurd
    Jul 10 '10 at 3:16
  • @Mark Hurd: Great comment! You learn something new every day! Jul 10 '10 at 9:48

You can search for multiple tags by typing them in the URL separated by %20. This does an AND search, i.e. only questions with all the tags you specified will be shown.

For example:


searches for both the 'windows' and the 'com' tags

Alternatively you can type the following in the search box in the top right for the same results:

[windows] [com]

  • It'd be nice if they enabled the word 'AND' but i'm happy to learn about this, thanks. Oct 7 '08 at 19:11
  • 9
    You can also do "tag1 or tag2" in the URL.
    – Evan
    Jun 12 '09 at 11:30
  • 3
    In fact, I think the "not" keyword works as well.
    – Evan
    Jun 12 '09 at 11:31
  • Related feature request: meta.stackexchange.com/questions/30371/… Dec 1 '09 at 20:20
  • 5
    [or] is now a tag so you can do [foo][or][bar] in the search box. Feb 18 '11 at 4:21
  • 1
    [or] is no longer a tag; I imagine that's because it wasn't intended as a search operator, it was intended to act like the rest of the tags. ;)
    – ashleedawg
    Aug 6 '18 at 0:27

Start a blockquote with >! for:



#stackoverflow IRC channel on freenode, and the SObot that will post new questions in the channel as they're posted.

  • never knew the IRC channel existed! great find! Dec 1 '09 at 19:36
  • 3
    @George: It's not a support channel! It's a mostly off-topic channel for socialising. (I speak as one of the very first people to come to that channel, back when it started in August 2008. It was founded by non-SO-staff, and even now, SO staff coverage is very thin; Geoff Dalgas comes in occasionally, but nobody else.) Apr 19 '10 at 17:28
  • Also, sobot is now in its own channel, #sobot. (zigdon is the owner of sobot, so, if he had an account on meta, I'm sure he'd update the post to say so.) Apr 19 '10 at 17:32
  • Fortunately there is no such bot, or the channel would be unusable.
    – gerrit
    Nov 28 '18 at 20:51
  • Back in '09 there was, it was great. Not shocked it no longer runs though.
    – zigdon
    Dec 5 '18 at 22:28

Tag links:

Syntax: [tag:tag-name]

Meta tags:

(red because it's moderator only tag)

Syntax: [meta-tag:tag-name]


Typing --- in chat forces a new section. Usually, consecutive chat messages from the same user are kept in the same box.

enter image description here

It is hidden in the transcript, but the separation between sections is still visible:

enter image description here


Comment timestamp is a permalink to that comment: (need to right click it --> copy link address)

In the above example clicking that timestamp leads here.


It's possible to view the markup used to create any question or answer. (This may be useful if you wish to combine answers or quote part of the question with formatting.)

If the question or answer has been edited so that it has an edited X timeunits ago link, you can use that to view the revision history, then use the view source link.

If it hasn't been edited then you can still view the revision history, but you'll have to manually enter the url in your browser's address bar. For questions, take the number in the middle of the page's url; for answers use the link link for the answer to get it's unique number in the anchor of the url (after the # character) and then go to:


  • 1
    A feature like this should not be hidden.
    – RomanSt
    Jan 29 '11 at 22:26
  • 31
    I usually just click "edit". Now that even low reputation users can click edit, this is not very hard to find.
    – Brian
    Jan 31 '11 at 16:58
  • 3
    Although it's still useful, since low-rep users can't edit on meta sites.
    – JonasCz
    Jan 19 '16 at 15:54

I just noticed today that asker comments are shaded just like the background for the user box:

enter image description here

This applies in comments to everything for that particular question too. It can be handy for context on larger pages.

  • 1
    I just noticed that this applies to self answers, too.
    – a cat
    Jun 21 '12 at 22:26
  • 23
    this feature doesn't seem too hidden
    – ajax333221
    Sep 21 '12 at 16:35

Sending a chat message consisting solely of this is fine now oneboxes to this comic:

this is fine

If you want to test this for yourself, please use the Sandbox room to avoid bothering others.

  • 6
    How... how did you find?! ;) Dec 19 '16 at 11:02
  • 2
    @ShadowWizard Hat hunting for Winterbash :)
    – user307833
    Dec 19 '16 at 11:02

When you search for a popular keyword the search gets auto-converted to a tag search.

- results: 6,560 questions tagged

You can override that by prefixing a plus sign.

+hibernate - results: 4,807 search results for posts containing +hibernate
(some of which are not tagged )


Modify tags in question (hidden area at right of tag list):

enter image description here

Note: This is only available with 10k rep or more.

  • 3
    What's the difference between that and retag question that requires only 500 rep?
    – HuBeZa
    Feb 7 '11 at 11:31
  • 3
    @HuBeZa It's the same function with another user interface. Feb 7 '11 at 11:38
  • 1
    @HuBeZa also the retag link is removed after hitting 2K.
    – Keelan
    May 22 '13 at 18:33
  • 1
    The “retag question” function / privilege seems to have gone away⁠ altogether.
    – Scott
    Aug 24 '17 at 6:45

Well, not only related to Stack Overflow but also AWESOME: ODATA for all Stack Exchange sites.

There's even some saved queries to know. For example, how much is still missing for me to get the X badge.

This is awesome!

  • 1
    It is great, yes. Hopefully Area51 will soon be added. Nov 7 '10 at 16:35
  • OData is unfortunately disabled now on SEDE it won't comeback.
    – rene
    Jul 25 '18 at 19:12

You can write small text using <sub><sup> trick. For example wrapped with "single" <sub><sup>:

hello world

With two:

hello world

  • 17
    Don't do that. It's an abuse of the markup, which is supposed to be for superscripts and subscripts. And it'll look horrible if you have multiple lines of text. Jan 2 '13 at 0:44
  • 10
    @Mechanicalsnail I just shared something I've seen lots of times here, not my idea. But personally I think that since we don't have any <small> tag it can be useful to show small sized text. Jan 2 '13 at 7:35
  • 4
    Works as a charm for <sup>[Image source](url)</sup> links under images.
    – E.P.
    Aug 3 '15 at 19:42

Every site on Stack Exchange network has a "network login help" page, which run a few tests to check for the availability of certain necessary features in the user's browser.

To reach the page just append /network-login-help to the URL of any site, e.g. for the main site: https://stackoverflow.com/network-login-help


View other users' privileges page by visiting /help/privileges/user/<id> URL. This page is accessible without any restrictions which seems to be by design.

Came to know about this feature from a post made by animuson.


When you upload an image, you can append these characters to its name to get:

  • s -> small square fixed at 90×90
  • b -> big square fixed at 160×160
  • t -> small thumb, 160×160
  • m -> medium thumb (max 320?)
  • l -> large thumb (max 640?)
  • h -> huge thumb (max 1024?)
  • add ?s=X for a custom size (X=16,32,64,128,256 or 512 (source))




Small square:


small square

Big square:


big square

Small thumbnail:



Medium thumbnail:



Large thumbnail:



Huge thumbnail:



Custom size: e.g. 16x16



  • 8
    Strictly speaking, this is a feature of imgur.com and not of Stack Exchange. This is documented here and here.
    – Scott
    Jun 9 '17 at 22:17

To find the age of specific site, you can view the profile of the site's Community account, then the "member for" is the site age since this is the very first account ever created on each site.

For example on puzzling site: (URL template is //[site].com/users/-1/community)

Easier than going to the full sites list and looking for the site you want. :)

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