When you hit "Copy share link" on any FerrLens tool, the URL used to look like #left=&right= — readable, but enormous for anything text-heavy (diff, JSON formatter, JWT decoder routinely produced 5-10 KB URLs that bumped against browser limits).

The fragment is now a single lz-string-compressed JSON blob: #N4IgDghgLlC.... Same data, packed.

Real numbers from the diff tool:

Input	Old fragment	New fragment	Saving
1 KB (two code snippets)	1,409 chars	886 chars	-37%
3.3 KB (markdown doc + edits)	4,020 chars	2,686 chars	-33%

Bigger inputs compress proportionally better — at 10+ KB you're typically saving more than half. Two side benefits:

• The fragment is now opaque to anyone glancing at the URL bar. No more accidental disclosure of the diff content or the JWT you were debugging.
• Special characters and Unicode no longer pay the percent-encoding tax (every \n used to be 3 bytes, every accented char 6-9).

Old share links keep working. The hook detects the legacy ?key=value format on load, parses it, and rewrites to the compressed form on your first edit — so existing bookmarks don't break.