Hexdump viewer

A hex dump shows data byte by byte: an offset column, the bytes in hexadecimal and a printable ASCII representation. It is the classic way to see what a file or string really contains, including invisible characters that editors hide. This viewer renders text in the same layout as the Unix xxd and hexdump -C tools.

How to use it

1. Paste or type text.
2. Read the dump: offset, 16 bytes per row in hex and the ASCII column.
3. Look for unexpected bytes.

Example

The text Hi there! followed by a Windows line break dumps as:

00000000: 4869 2074 6865 7265 210d 0a    Hi there!..

The 0d 0a at the end is CR LF; non-printable bytes are shown as dots in the ASCII column.

What hex dumps help you find

• Byte order marks: EF BB BF at the start of a UTF-8 file can break CSV headers, shell scripts and JSON parsers.
• Line ending problems: stray 0D bytes cause errors like bad interpreter when Windows files run on Linux.
• Non-breaking spaces: C2 A0 looks like a space but is not, so string comparisons fail.
• Zero-width characters: E2 80 8B is a zero-width space, invisible in editors but present in data copied from web pages.
• Smart quotes: E2 80 9C and E2 80 9D instead of a plain quote.

Command-line equivalents

• xxd file.txt
• hexdump -C file.txt
• Format-Hex file.txt in PowerShell