There is hexl-forward-char which lets me move forward/backward specifying a decimal offset.

And there is also hexl-goto-hex-address to specify an absolute location using a hexadecimal number.

Is there perhaps also something builtin that lets me move by an hexadecimal offset, or do I need to roll my own here?

  • I'm not seeing any other movement commands calling hexl-hex-string-to-integer, so I think you'll have to roll your own.
    – phils
    Nov 6, 2018 at 22:13

2 Answers 2


The upcoming nhexl-mode-1.0 (in GNU ELPA) changes C-u so it takes hexadecimal input. IOW C-u 10 C-f will advance by 16 chars instead of 10.

  • It works! Where can I report nhexl-mode bugs? Nov 9, 2018 at 16:55
  • You can send them directly to me or M-x report-emacs-bug.
    – Stefan
    Nov 9, 2018 at 17:06

Here's my own function. It seems to do the trick.

(defun hexl-hex-forward-char (hex-offset)
  "Move to right HEX-OFFSET bytes (left if negative) in Hexl mode."
  (interactive "sHex Offset: ")
    (+ (hexl-current-address)
    (hexl-hex-string-to-integer hex-offset))))

And the following overwrites the key binding for hexl-forward-word which I don't use:

(add-hook 'hexl-mode-hook
          (lambda () (local-set-key (kbd "M-f") #'hexl-hex-forward-char)))

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