Why is there a file size limit?

Rendering a hex dump in the browser is fast for tens of KB but bogs down past 1 MB. The 64 KB cap keeps the UI responsive — for bigger files, use `xxd` on the command line.

What encoding is the text input?

UTF-8. A character like `é` shows as two bytes (`C3 A9`) and ASCII letters are single bytes. If you need a specific encoding, paste pre-encoded bytes via the file input.

Why are non-printable bytes shown as `.`?

Same convention as `xxd`: bytes outside the printable ASCII range (0x20–0x7E) become `.` in the gutter so the alignment stays readable. The hex column still shows the exact byte.

Does this upload my file?

No. The file is read via the FileReader API and the dump is computed in your browser.

Hex Dump Viewer

Paste text or drop a file (up to 64 KB) and see it laid out the way `xxd` or `hexdump -C` would: a hex offset column, the bytes in hex, and an ASCII gutter with printable characters (non-printable bytes show as `.`). Useful for spotting BOMs, hidden control characters, encoding mismatches, or just understanding what's actually in a file.

—

Text

Hex dump (14 bytes)

00000000  48 65 6C 6C 6F 2C 20 77 6F 72 6C 64 21 0A        |Hello, world!.|

All processing happens locally — file contents never leave your browser.

How to use

Switch to text or file input.
Pick 8, 16, or 32 bytes per row.
Read off the hex columns and the ASCII gutter, then copy the dump if needed.

Frequently asked questions

Why is there a file size limit?: Rendering a hex dump in the browser is fast for tens of KB but bogs down past 1 MB. The 64 KB cap keeps the UI responsive — for bigger files, use `xxd` on the command line.
What encoding is the text input?: UTF-8. A character like `é` shows as two bytes (`C3 A9`) and ASCII letters are single bytes. If you need a specific encoding, paste pre-encoded bytes via the file input.
Why are non-printable bytes shown as `.`?: Same convention as `xxd`: bytes outside the printable ASCII range (0x20–0x7E) become `.` in the gutter so the alignment stays readable. The hex column still shows the exact byte.
Does this upload my file?: No. The file is read via the FileReader API and the dump is computed in your browser.

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