Arrows
How to type Double left-right arrow (⇔)
Copy the character, or use the shortcut that matches your keyboard and app.
Windows
No classic numeric Alt code. Copy the character or use Win + . and search the name.
Mac
Character Viewer → arrow
Microsoft Word
Type 21D4 then Alt + X
Google Docs
Insert → Special characters → arrow
How to insert it
Copy
Click the keycap, then paste with Ctrl+V or Cmd+V.
Alt code
This character has no short Alt code. Copy it instead.
Code
Use the Unicode, HTML, CSS, or JS value below in documents and stylesheets.
- Unicode
U+21D4- HTML decimal
⇔- HTML hex
⇔- CSS
\21D4- JavaScript
\u{21D4}
Related
About the Double left-right arrow
The Double left-right arrow (⇔, U+21D4) the double-headed left-right arrow (⇔) — means "if and only if" in logic and marks reversible reactions in chemistry.
Arrows do heavy lifting in documents: flowcharts, instructions, chat replies, and interface labels. Direction is the whole point, so each arrow has its own code — double-check you've grabbed the right one before pasting.
The copy button above is fastest for a one-off. If you need ⇔ often, use its Unicode value 21d4 — in Word, type it and press Alt+X; on Windows, the Character Map app (search "Character Map" in Start) inserts it into any program.
In Unicode it lives in the Arrows block, so it behaves the same everywhere Unicode is supported — which today means virtually every device, app, and browser. Related symbols: Right arrow, Left arrow, Up arrow.
Double left-right arrow quick reference
| Symbol | ⇔ |
|---|---|
| Name | Double left-right arrow |
| Unicode | U+21D4 |
| Alt code | — |
| HTML decimal | ⇔ |
| HTML hex | ⇔ |
| HTML entity | ⇔ |
| CSS | \21D4 |
| JavaScript | \u21D4 |
| URL encoded | %E2%87%94 |
Compatibility: Displays correctly on iPhone, Android, Windows and Mac.
How to type ⇔ on your phone
iPhone / iPad
iPhones have no Alt codes. The fastest way is to copy the symbol above and paste it where you need it. To reuse it often, save it as a text replacement: go to Settings → General → Keyboard → Text Replacement, tap +, paste the symbol into Phrase and give it a Shortcut.
Android
On Gboard, tap ?123 then =\< to open the symbols keyboard — many symbols hide under a long-press on related keys. Otherwise just copy the symbol above and paste it; it works in every app.