What happens if a byte sequence is invalid UTF-8?

Our decoder uses standard fatal UTF-8 validation and highlights the exact illegal sequence without silent corruptions.

unicode

Private (Runs in Browser)

Free Utility

UTF-8 Encoder & Decoder

Encode text into UTF-8 Hex, Binary, Decimal, Base64, and C byte arrays, or decode raw UTF-8 byte streams with multi-byte inspection.

Format:

INPUT UNICODE TEXT

34 chars • 6 words

ENCODED UTF-8 (HEX)

125 chars • 125 B

54 79 70 65 4B 69 74 54 6F 6F 6C 73 20 F0 9F 9A 80 20 E2 82 AC 32 34 2E 39 39 20 E2 80 94 20 C3 9C 62 65 72 20 63 6F 6F 6C 21

Total Bytes

42 B

Characters

Avg Bytes/Char

1.24

Multi-byte Count

Per-Character UTF-8 Byte Breakdown

Showing first 34 characters

Glyph	Codepoint	Length	Hex Bytes	Binary Bytes	Decimal
T	U+0054	1 byte	54	01010100	84
y	U+0079	1 byte	79	01111001	121
p	U+0070	1 byte	70	01110000	112
e	U+0065	1 byte	65	01100101	101
K	U+004B	1 byte	4B	01001011	75
i	U+0069	1 byte	69	01101001	105
t	U+0074	1 byte	74	01110100	116
T	U+0054	1 byte	54	01010100	84
o	U+006F	1 byte	6F	01101111	111
o	U+006F	1 byte	6F	01101111	111
l	U+006C	1 byte	6C	01101100	108
s	U+0073	1 byte	73	01110011	115
	U+0020	1 byte	20	00100000	32
🚀	U+1F680	4 bytes	F0 9F 9A 80	11110000 10011111 10011010 10000000	240, 159, 154, 128
	U+0020	1 byte	20	00100000	32
€	U+20AC	3 bytes	E2 82 AC	11100010 10000010 10101100	226, 130, 172
2	U+0032	1 byte	32	00110010	50
4	U+0034	1 byte	34	00110100	52
.	U+002E	1 byte	2E	00101110	46
9	U+0039	1 byte	39	00111001	57
9	U+0039	1 byte	39	00111001	57
	U+0020	1 byte	20	00100000	32
—	U+2014	3 bytes	E2 80 94	11100010 10000000 10010100	226, 128, 148
	U+0020	1 byte	20	00100000	32
Ü	U+00DC	2 bytes	C3 9C	11000011 10011100	195, 156
b	U+0062	1 byte	62	01100010	98
e	U+0065	1 byte	65	01100101	101
r	U+0072	1 byte	72	01110010	114
	U+0020	1 byte	20	00100000	32
c	U+0063	1 byte	63	01100011	99
o	U+006F	1 byte	6F	01101111	111
o	U+006F	1 byte	6F	01101111	111
l	U+006C	1 byte	6C	01101100	108
!	U+0021	1 byte	21	00100001	33

Loading tool engine...

Frequently Asked Questions

UTF-8 uses 1 byte for ASCII characters (0-127), 2 bytes for Latin accents/Greek/Arabic, 3 bytes for Chinese/Japanese/common symbols, and 4 bytes for emoji and astral plane characters.

Related Utilities

Utf16 Converter Unicode Converter Character Inspector Base64