Use HTML's definition of multiple spaces to hide base64 code on any HTML page.
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examples
00-base64-conversion-table.txt
00-binary-digits.txt
LICENSE.md
README.md
base64-binary-tobefree.txt
binary-base64-tobefree.txt
binary-escaper-tobefree.txt
binary-spacer-tobefree.txt

README.md

Whitespace Steganography

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

Whitespace Steganography

Use HTML's interpretation of multiple spaces to hide base64 code on any HTML page.

Example:

wget -O - 'https://en.wikipedia.org/wiki/User:ToBeFree/sandbox?action=edit' | grep -E '\[[0-9]+\]' | sed 's/\s\s\s\s/1/g' | sed 's/\s\s\s/0/g' | sed -r 's/\[[0-9]+\]//g' | tr -d -c '10' | fold -w 6 | tr '\n' ' ' > binary.txt

bash binary-base64-tobefree.sh binary.txt | base64 -d > decoded-output.txt

Useful for ENcoding: Kate for Linux has a "block/rectangular selection" tool.