Developer Reference

URL Encoding Character Reference

Published September 8, 2026

Common characters and their percent-encoded equivalents. For why URL encoding exists, see What Is URL Encoding and Why Is It Used?.

Character Encoded As
Space %20
& %26
? %3F
# %23
/ %2F
: %3A
@ %40

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Frequently Asked Questions

Why does a space sometimes encode as %20 and sometimes as +?

%20 is the standard percent-encoding for a space. The + symbol is a legacy convention specific to form submissions, not universal URL encoding.

Do I need to encode every character in a URL?

No. Only reserved and unsafe characters need encoding. Letters, digits, and a few symbols (hyphen, underscore, period, and tilde) are safe to leave as-is.

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