If you use the browser console or certain external editors, the game will give you the shadow achievement "Cheated Cookies Taste Awful." Some players hate this; others consider it a badge of honor. If you want a "clean" profile, use manual Base64 editing (explained below), which sometimes avoids the flag—but not always.
This is arguably the most famous web-based editor. It allows users to paste their save file directly into the browser. cookie clicker save edit
import base64, json
data = ... # your edited dict
s = base64.b64encode(json.dumps(data,separators=(',',':')).encode()).decode()
print(s) # paste into Cookie Clicker Import
When you hit "Export," you get a long string of characters. It looks like garbage, but it is actually a Base64 encoded string. If you use the browser console or certain
The most obvious edit. Players often give themselves a "Sextillion" cookies or edit their Prestige Level directly. This bypasses the need to ascend repeatedly. You can also edit the "Heavenly Chips" spent vs. unspent to unlock every heavenly upgrade instantly. When you hit "Export," you get a long string of characters