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Per comment feedback, emphasize only secure option for electronic distribution
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Create your own custom font

You can easily create your own custom font(s) for this. A quick web search finds FontStruct and Calligrapher are free options, though I have never tried either one myself and I can no longer find what software I used when I did this for fun back in high school.

Style with white text and black (not automatic) underline

As @Wolff mentioned in a comment, itThis is also possibleclosest to create a Word style with white textthe answer you requested, but if you are distributing workbooks electronically then it's trivial for students to cheat and a black underlineget the hidden answers back. You said you know howAll they have to use Update Style to match selection, so just do this with some text with whiteis copy the hidden answer text and a black underline. Notefrom the PDF, you must setpaste it into another program, and change the underline color/font/underline/etc to Black and not leave it on Automaticget the answers readable again.

Set black underline color

Update style to match selection If your workbooks are only distributed in printed form, then copy-paste doesn't exist so this isn't a problem.

Search and replace (only safe option for electronically-distributed PDF workbooks)

Another option is actually replacing all characters in that style with underscores, with a Find and Replace All. IfEven if students get the PDFs with the blank spaces, this prevents them from being able to copycopying the white text from the PDF and paste it into another program, which and changing font/color/underline/whatever only reveals the answersnumber of letters in the answer, but not the answer itself. Note to keep the same spacing and line breaks, your answers must use a monospace font like Consolas, Courier New, or one of the more normal-looking monospace fonts on Google Fonts. If you use a regular font, the spacings will all slightly expand as underscores _ characters are wider than characters like i. To do the replacement,

  1. Ctrl+H to open the Find and Replace dialogue
  2. Click More >>.
  3. Enable the Use wildcards option
  4. Put ? in the Find what box (this is a wildcard matching any single character)
  5. Put _ in the Replace with box.
  6. At the bottom-left of the window, click FormatStyleYOURSTYLE Char (you need to select your style ending in Char, since you applied the style to individual word characters and not entire paragraphs, see this article for more info).
  7. Select Replace All and save a copy of the document (since this is permanently removing information).

enter image description hereMicrosoft Word Search and Replace with Style and Wildcard

Style with white text and black (not automatic) underline

This option takes the least amount of work, but is also easily cheated from an electronic PDF. Idea comes from @Wolff in his comment above.

It is also possible to create a Word style with white text and a black underline. You said you know how to use Update Style to match selection, so just do this with some text with white text and a black underline. Note, you must set the underline color to Black and not leave it on Automatic.

Set black underline color

Update style to match selection

Create your own custom font

You can easily create your own custom font(s) for this. A quick web search finds FontStruct and Calligrapher are free options, though I have never tried either one myself and I can no longer find what software I used when I did this for fun back in high school.

Style with white text and black (not automatic) underline

As @Wolff mentioned in a comment, it is also possible to create a Word style with white text and a black underline. You said you know how to use Update Style to match selection, so just do this with some text with white text and a black underline. Note, you must set the underline color to Black and not leave it on Automatic.

Set black underline color

Update style to match selection

Search and replace

Another option is actually replacing all characters in that style with underscores, with a Find and Replace All. If students get the PDFs with the blank spaces, this prevents them from being able to copy the white text from the PDF and paste it into another program, which reveals the answers. Note to keep the same spacing and line breaks, your answers must use a monospace font like Consolas, Courier New, or one of the more normal-looking monospace fonts on Google Fonts. If you use a regular font, the spacings will all slightly expand as underscores _ characters are wider than characters like i. To do the replacement,

  1. Ctrl+H to open the Find and Replace dialogue
  2. Click More >>.
  3. Enable the Use wildcards option
  4. Put ? in the Find what box (this is a wildcard matching any single character)
  5. Put _ in the Replace with box.
  6. At the bottom-left of the window, click FormatStyleYOURSTYLE Char (you need to select your style ending in Char, since you applied the style to individual word characters and not entire paragraphs, see this article for more info).
  7. Select Replace All and save a copy of the document (since this is permanently removing information).

enter image description here

Create your own custom font

You can easily create your own custom font(s) for this. A quick web search finds FontStruct and Calligrapher are free options, though I have never tried either one myself and I can no longer find what software I used when I did this for fun back in high school.

This is closest to the answer you requested, but if you are distributing workbooks electronically then it's trivial for students to cheat and get the hidden answers back. All they have to do is copy the hidden answer text from the PDF, paste it into another program, and change the color/font/underline/etc to get the answers readable again.

If your workbooks are only distributed in printed form, then copy-paste doesn't exist so this isn't a problem.

Search and replace (only safe option for electronically-distributed PDF workbooks)

Another option is actually replacing all characters in that style with underscores, with a Find and Replace All. Even if students get the PDFs with the blank spaces, copying the text into another program and changing font/color/underline/whatever only reveals the number of letters in the answer, but not the answer itself. Note to keep the same spacing and line breaks, your answers must use a monospace font like Consolas, Courier New, or one of the more normal-looking monospace fonts on Google Fonts. If you use a regular font, the spacings will all slightly expand as underscores _ characters are wider than characters like i. To do the replacement,

  1. Ctrl+H to open the Find and Replace dialogue
  2. Click More >>.
  3. Enable the Use wildcards option
  4. Put ? in the Find what box (this is a wildcard matching any single character)
  5. Put _ in the Replace with box.
  6. At the bottom-left of the window, click FormatStyleYOURSTYLE Char (you need to select your style ending in Char, since you applied the style to individual word characters and not entire paragraphs, see this article for more info).
  7. Select Replace All and save a copy of the document (since this is permanently removing information).

Microsoft Word Search and Replace with Style and Wildcard

Style with white text and black (not automatic) underline

This option takes the least amount of work, but is also easily cheated from an electronic PDF. Idea comes from @Wolff in his comment above.

It is also possible to create a Word style with white text and a black underline. You said you know how to use Update Style to match selection, so just do this with some text with white text and a black underline. Note, you must set the underline color to Black and not leave it on Automatic.

Set black underline color

Update style to match selection

Add workaround to final solution to prevent spacing change
Source Link

Create your own custom font

You can easily create your own custom font(s) for this. A quick web search finds FontStruct and Calligrapher are free options, though I have never tried either one myself and I can no longer find what software I used when I did this for fun back in high school.

Style with white text and black (not automatic) underline

As @Wolff mentioned in a comment, it is also possible to create a Word style with white text and a black underline. You said you know how to use Update Style to match selection, so just do this with some text with white text and a black underline. Note, you must set the underline color to Black and not leave it on Automatic.

Set black underline color

Update style to match selection

Search and replace

Another option is actually replacing all characters in that style with underscores, with a Find and Replace All. If students get the PDFs with the blank spaces, this prevents them from being able to copy the white text from the PDF and paste it into another program, which reveals the answers. This will slightly changeNote to keep the same spacing thoughand line breaks, your answers must use a monospace font like Consolas, Courier New, or one of the more normal-looking monospace fonts on Google Fonts. If you use a regular font, the spacings will all slightly expand as underscores _ characters are wider than characters like i. To do the replacereplacement,

  1. Ctrl+H to open the Find and Replace dialogue
  2. Click More >>.
  3. Enable the Use wildcards option
  4. Put ? in the Find what box (this is a wildcard matching any single character)
  5. Put _ in the Replace with box.
  6. At the bottom-left of the window, click FormatStyleYOURSTYLE Char (you need to select your style ending in Char, since you applied the style to individual word characters and not entire paragraphs, see this article for more info).
  7. Select Replace All and save a copy of the document (since this is permanently removing information).

enter image description here

Create your own custom font

You can easily create your own custom font(s) for this. A quick web search finds FontStruct and Calligrapher are free options, though I have never tried either one myself and I can no longer find what software I used when I did this for fun back in high school.

Style with white text and black (not automatic) underline

As @Wolff mentioned in a comment, it is also possible to create a Word style with white text and a black underline. You said you know how to use Update Style to match selection, so just do this with some text with white text and a black underline. Note, you must set the underline color to Black and not leave it on Automatic.

Set black underline color

Update style to match selection

Search and replace

Another option is actually replacing all characters in that style with underscores, with a Find and Replace All. If students get the PDFs with the blank spaces, this prevents them from being able to copy the white text from the PDF and paste it into another program, which reveals the answers. This will slightly change the spacing though, as underscores _ characters are wider than characters like i. To do the replace,

  1. Ctrl+H to open the Find and Replace dialogue
  2. Click More >>.
  3. Enable the Use wildcards option
  4. Put ? in the Find what box (this is a wildcard matching any single character)
  5. Put _ in the Replace with box.
  6. At the bottom-left of the window, click FormatStyleYOURSTYLE Char (you need to select your style ending in Char, since you applied the style to individual word characters and not entire paragraphs, see this article for more info).
  7. Select Replace All and save a copy of the document (since this is permanently removing information).

enter image description here

Create your own custom font

You can easily create your own custom font(s) for this. A quick web search finds FontStruct and Calligrapher are free options, though I have never tried either one myself and I can no longer find what software I used when I did this for fun back in high school.

Style with white text and black (not automatic) underline

As @Wolff mentioned in a comment, it is also possible to create a Word style with white text and a black underline. You said you know how to use Update Style to match selection, so just do this with some text with white text and a black underline. Note, you must set the underline color to Black and not leave it on Automatic.

Set black underline color

Update style to match selection

Search and replace

Another option is actually replacing all characters in that style with underscores, with a Find and Replace All. If students get the PDFs with the blank spaces, this prevents them from being able to copy the white text from the PDF and paste it into another program, which reveals the answers. Note to keep the same spacing and line breaks, your answers must use a monospace font like Consolas, Courier New, or one of the more normal-looking monospace fonts on Google Fonts. If you use a regular font, the spacings will all slightly expand as underscores _ characters are wider than characters like i. To do the replacement,

  1. Ctrl+H to open the Find and Replace dialogue
  2. Click More >>.
  3. Enable the Use wildcards option
  4. Put ? in the Find what box (this is a wildcard matching any single character)
  5. Put _ in the Replace with box.
  6. At the bottom-left of the window, click FormatStyleYOURSTYLE Char (you need to select your style ending in Char, since you applied the style to individual word characters and not entire paragraphs, see this article for more info).
  7. Select Replace All and save a copy of the document (since this is permanently removing information).

enter image description here

Source Link

Create your own custom font

You can easily create your own custom font(s) for this. A quick web search finds FontStruct and Calligrapher are free options, though I have never tried either one myself and I can no longer find what software I used when I did this for fun back in high school.

Style with white text and black (not automatic) underline

As @Wolff mentioned in a comment, it is also possible to create a Word style with white text and a black underline. You said you know how to use Update Style to match selection, so just do this with some text with white text and a black underline. Note, you must set the underline color to Black and not leave it on Automatic.

Set black underline color

Update style to match selection

Search and replace

Another option is actually replacing all characters in that style with underscores, with a Find and Replace All. If students get the PDFs with the blank spaces, this prevents them from being able to copy the white text from the PDF and paste it into another program, which reveals the answers. This will slightly change the spacing though, as underscores _ characters are wider than characters like i. To do the replace,

  1. Ctrl+H to open the Find and Replace dialogue
  2. Click More >>.
  3. Enable the Use wildcards option
  4. Put ? in the Find what box (this is a wildcard matching any single character)
  5. Put _ in the Replace with box.
  6. At the bottom-left of the window, click FormatStyleYOURSTYLE Char (you need to select your style ending in Char, since you applied the style to individual word characters and not entire paragraphs, see this article for more info).
  7. Select Replace All and save a copy of the document (since this is permanently removing information).

enter image description here