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The Stack Exchange network user interface has a lot of forms, and subsequently, inputs with various character limits in place. Some of them are notorious (such as custom moderator flag character limit or the custom suggested edit reject reason one), some are less well-known.

It is past time we had a definitive guide on those for the sake of having documentation and for providing a unified place for tracking changes to the limits (should such a thing occur in 6 to 8 time units), so the question is:

What are the various character limits across the Stack Exchange network?

The scope of this Q&A is limited to character limits only.
For a detailed guide on rate-limiting, see the The Complete Rate-Limiting Guide.

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    I've attempted to make the reference as complete as possible from the start, but it is a work in progress - please do let me know what I missed or should be added (moderator tools limits, articles limits, etc) Nov 23 at 16:10
  • "It is past time we had a definitive guide" - the reading should not be rushed on this one. Nov 23 at 22:06
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    Anyway, kudos for the initiative. Nov 23 at 22:08
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Area 51

Input Field Min Max Notes/Images
Example question 15 150 Min:
example question dialog - min
Proposal topic 3 150 Min:
choose a topic field - min
Proposal audience 15 250 Min:
describe audience field - min
Proposal champions 15 500 Min:
describe organizers - min

Bounties

Input Field Min Max Notes/Images
Expectations 30 3000 Min:
expectations dialog

Max:
Reduce Character Limit for Bounty Custom Text

Close votes

Input Field Min Max Notes/Images
"Other - add a comment" off-topic reason 30 500 Min:
off-topic reason dialog - min

Close reasons (Mod-only edits)

Input Field Min Max Notes
Brief Description 10 100 e.g. "No longer reproducible"
Usage guidance, Close description, Post owner guidance, Privileged user guidance 25 500 See screenshot

Chat

Input Field Min Max Notes
Single-line message 1 500 Max:
What is the maximum length of a chat room message?
Chat search 0 80
Room description 0 500 Max:
Chat room info/description max length

Contact Us

Input Field Min Max Notes
Problem description 15 5000 Min:
contact us form - min
Help center search 0 300

Edits

Input Field Min Max Notes
Edit summary 0 300 Minimum is 10 if suggesting an edit
Please enter at least 10 characters
Suggested edits 6 depends There is no max length limit for registered users, other than the post length limit. For anonymous users, there's an undisclosed limit, and hitting it will ban the IP address for 7 days.
Sources:
How do suggested edits work?
How to overcome "Edits must be at least 6 characters"
Redaction explanation 1 300 Text field labelled "Redaction summary" with placeholder "explain what's being redacted (removed login information, expunged personally-identifying information)" and a red "Redact revision" button and a "Cancel" link

Elections

Input Field Min Max Notes
Nomination post 1200 Max:
Does anyone else think the moderator nominations are TLDR?

Flags

Input Field Min Max Notes/Images
"In need of moderator intervention" flag reason 10 500 Min:
custom mod flag dialog - min
"Something else" comment flag reason 6 200 Min:
custom comment flag dialog - min

Max:
Make the moderator flag comment max length longer
Declined flag custom reason 10* 200 the minimum is not enforced

Min:
enter image description here
Helpful flag reason 10* 200 the minimum is not enforced

Min:
helpful flag reason - min

Help Center (Mod-only edits)

Input Field Min Max Notes
Blurb under the favicon, Tour ??? ???
"Ask about.." and "Don't ask about...", Tour ??? ???
What topics can I ask about here? ??? ???
Area under the search bar, Help Center 0 ???

Posts

Input Field Min Max Notes
Answers 30 30 000 Max:
Please increase the maximum allowed length for answers
Community Wikis 30 30 000 Max:
Character limit for wiki answers
Comments 15 600 Min:
Why was the minimum comment length of 15 chosen?
Question body 1 (?) 30 000 Max:
Is there a limit on the length of a question?
Question title 15 150 Min:
Able to break the minimum title length restriction?

Profile

Input Field Min Max Notes
About me 0 3000 Max:
Could we get "n characters left" status when editing "About Me" in our profile?
Display Name 3 30 Min:
Prevent (or at least notify about) display names shorter than 3 chars
Full Name 0 100
Location 0 100
Moderator annotatons 10 300

Reviews

Input Field Min Max Notes
Suggested edit rejection reason 20 150 Min:
custom rejection reason - min

Search & Filters

Input Field Min Max Notes
Site search 0 240 Max:
Remove the max length restriction on the search boxes
Tag filter 0 35

Tags

Input Field Min Max Notes
Tag names 1 35 Max:
Raising the 25 chars limit for tags
Tag excerpts 20 460 Min:
tag excerpt field - min

Max:
The Tag Wiki dropdown should display the entire tag wiki excerpt mentions 450, but the data-max-length on the input is actually set to 460
Tag wikis 30 unknown Min:
tag wiki body - min
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    This is a nice start. Next, I have to wonder about moderator-only fields, such as those for the help center. Or even Tag Warning text, which can only be set by a developer, I think. (I may see what I can add later.)
    – Laurel
    Nov 23 at 17:55
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    @Laurel yeah, mod-only fields would be nice to have too - I got so tired of running around trying to find the limits scattered in various posts that I finally decided to initiate the definitive guide :) Hope it takes off Nov 23 at 17:57
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    The max length for election nominations is 1,200 characters Nov 23 at 19:16
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    By the way, it isn't possible to edit this post with the new editor unless you're in markdown mode, otherwise the formatting gets all screwy.
    – Laurel
    Nov 23 at 22:00
  • @Laurel ugh, yes, do not even mention the new editor :) I dread the time when it becomes mandatory (unless SE fixes the most egregious issues which, well, is far from guaranteed). Nov 23 at 22:15

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