THIS SCRIPT NO LONGER WORKS! Twitter has rolled out a fix for the web client hack. (Original text: Force enable cramming (280 character tweets) on Twitter. Use TamperMonkey. NOTE: Stops working when you switch pages, refresh to fix.)

Readme.md

As of 7 November 2017 everyone has access to 280 characters in supported clients, so you no longer need this script!

Twitter Cramming.user.js

// ==UserScript==
// @name Twitter Cramming
// @description Force enable cramming (280 character tweets) on Twitter
// @author Prof. 9
// @version 0.1
// @match https://twitter.com/*
// @run-at document-idle
// @namespace prof9.twittercramming
// ==/UserScript==

var initDataInput = document.getElementById('init-data');
var initData = JSON.parse(initDataInput.value);
initData.deciders.cramming_feature_enabled = true;
initData.deciders.cramming_ui_enabled = true;
initDataInput.value = JSON.stringify(initData);

// This is free and unencumbered software released into the public domain.
// 
// Anyone is free to copy, modify, publish, use, compile, sell, or
// distribute this software, either in source code form or as a compiled
// binary, for any purpose, commercial or non-commercial, and by any
// means.
// 
// In jurisdictions that recognize copyright laws, the author or authors
// of this software dedicate any and all copyright interest in the
// software to the public domain. We make this dedication for the benefit
// of the public at large and to the detriment of our heirs and
// successors. We intend this dedication to be an overt act of
// relinquishment in perpetuity of all present and future rights to this
// software under copyright law.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
// 
// For more information, please refer to <http://unlicense.org>

There doesn't happen to be a version that supports TweetDeck, is there?

@colemickens Not a userscript, but there is a way to get it working. Takes some more setting up though. See: https://twitter.com/Zemnmez/status/912876877391335424

@colemickens check this gist out: https://gist.github.com/Zemnmez/ffb5449d873d5407c7172534b762ae46

thx! its work

Doesn't appear to work. The 140 character limit is still imposed. Downloaded and installed as a Chrome userscript via the chrome://extensions page - is there something extra that has to happen?

@qix I just installed the Script, sent a tweet as test. Show to me 140, I sent 280 and successfully posted without problem

It works but 140 chars counter still there, any way to change it?

Your Tweet was over 140 characters. You'll have to be more clever. .. Well that's no fun :/
Nope. This refuse to work for me :(

doesn't work here (France)

edit : works after clearing cache

not work for me, in web console appear this error

ERROR: Execution of script 'Twitter Cramming' failed! initDataInput is null

I'm using Firefox Nightly 58.0a1

In CJK (Chinese, Japanese, Korean) and other language, cannot tweet long text.
So I made a CJK patch.
https://gist.github.com/if1live/bc4750c0d4585789b66d899129ecb9ad

Cause

• code 0~4351 : weight 100
• code 4352~65535 : weight 200

ab is in code 0 ~ 4351, total weight is 100 x 2 = 200.
가 is in code 4352 ~ 65535, total weight is 200 x 1 = 200.
double weight means half length.

https://abs.twimg.com/k/en/0.commons.en.e6c61ddd975ec97b1ee5.js

, r = o({}, a, {
version: "cramming",
max_tweet_length: 280,
default_weight: 200,
    ranges: [{
        start: 0,
        end: 4351,
        weight: 100
    }, {
        start: 4352,
        end: 65535,
        weight: 200
    }]
})

Solution

Access above config(TwitterTextOptions), then modify weight 200 to 100.

NOW I CAN POST 280-CHARACTER TWEETS IN JAPANESE

JACK KNOWS NOT WHAT POWER HE HAS HANDED ME

MUAHAHAHAHA

emoji is not in their char code because it based on 2 or more chars (surrogate-pair).

Ex: 😇 is 55357 + 56839
And some japanese kanji has same issue (𠮷、𩸽、and some……)

but Twitter API count that as 1 char. with default_weight: 100, it will be fixed.

https://gist.github.com/hinaloe/c2381b1370371f5d9a4bb2be190f9c66

It does work as intended, but the character counter seems to be broken.

Either way, thanks for making this simple to use!

@colemickens, I have just put the TweetDeck version in a Userscript if that is any use. It is a bit messy/hacky but it works. https://gist.github.com/erydactyl/8ac7fe290a5ea72706cc1b77d15163d9

I want to large it 280
https://goo.gl/Yms5au

Hi,
I've just hacked a version that survives switching pages.
No more refreshing,this is 2017 after all.
https://gist.github.com/LongHairedHacker/2b4e2a526f02906acbafe39229176b08
Feel free to integrate that here.

Cant get either of these to work :(

doesn't work anymore :/

Broken

Yep, Twitter rolled out a fix. You'll have to try one of the other methods out there to get your tweet on.

Here are some that work for TweetDeck:

• https://juliette.sh/280
• https://twitter.com/com/status/913092812270444544

Damn snitches

Are there any hacks for Tweetbot?

nothing here works... :-(( still at 140

off

Not work

wait, so is this working

Frustrated that like most I was not blessed with the new 280 char tweeting, and the "fixes" out there don't work anymore, I decided to fix :) As as a fully automatic #Greasemonkey #Tampermonkey script here: http://bit.ly/unlock280 Get your #280tweets on while you can! :)

@CollinChaffin Thanks Man, this works like a charm!

@CollinChaffin You, sir, are the man of the situation.

@CollinChaffin Thank you, You sir are awesome! 👍

Looks like the party's over

No longer working - Like us, The good folks at @twitter appear to have found a workround for this. It was fun while it lasted :)

sir, are the man of the situation.

https://gist.github.com/Prof9/c16fc4997e0ef5b22a15c43edd7f5f49