Why this tool is useful
Use this tool to prepare spelling exercises, visual identifiers, decorative labels or character-by-character test fixtures.
Text & List Tools · runs locally
Insert Separator Between Characters
Place a chosen separator between Unicode code points without splitting surrogate pairs such as emoji into invalid halves.
Ready. Your working data stays in this browser.
How it works
The input is iterated as Unicode code points and joined with a bounded separator, so astral characters remain valid single units.
Practical example
With a middle dot separator, A😀B becomes A·😀·B and the emoji is never broken into two replacement characters.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.