WordPress sends all HTML content encoded as UTF-8. If you save a file in a single-byte encoding, like Windows-1252¹, you create invalid characters for UTF-8. These are displayed with a replacement character, usually (but not necessary) as a question mark in a black diamond.
Always use UTF-8 for everything. Do not use a BOM (byte order mark), because this is treated as a printable character by PHP, and you will get the famous Headers already sent error.
¹ ANSI is not a real encoding. It resolves to your operating system’s locale encoding. This term should be forbidden in all text editors.
Related Posts:
- Is ‘# -*- coding: utf-8 -*-‘ also a comment in Python?
- What is the difference between UTF-8 and Unicode?
- Byte and char conversion in Java
- What is “=C2=A0” in MIME encoded, quoted-printable text?
- Strange characters – despite everything being UTF-8
- One for the gurus: upgrade to 3.x messed up only filenames with accented chars
- Word press replacing unicode characters with “?”s
- How to set charset for wp_remote_post request?
- Outputting post title without encoding
- Apostrophes showing up as ΓÇÖ after converting from Windows to Linux
- WordPress content shows this character ​​
- Symbols such as £ end up being  in the database
- Fix encoding ’ [closed]
- Getting Non-printable characters were found while entering Euro Symbol
- How to deal with apostrophes
- Encoding Issue while using French in WordPress
- Get ?? for unicode characters
- WordPress theme character encoding issue
- character encoding problem in custom template
- restored old database now some characters have changed?
- WordPress plugin problem with encoding
- Post removes any text from post that’s following special characters
- UTF-8 Characters in URL – IE problem
- WordPress Dashboard Characters Messed Up
- How to make sure the letters ‘pez’ do not convert to a fish symbol? [closed]
- Problem some Persian texts show in ISO-8859-5
- HTML encoding issues – “” character showing up instead of ” “
- What character encoding is >?
- How to replace � in a string
- Does “\d” in regex mean a digit?
- What is base 64 encoding used for?
- Python – Reading and writing csv files with utf-8 encoding
- Where does this come from: -*- coding: utf-8 -*-
- python encoding utf-8
- The origin on why ‘%20’ is used as a space in URLs
- I have a string with “\u00a0”, and I need to replace it with “” str_replace fails
- “Unmappable character for encoding UTF-8” error
- URL Encoding Issue %3D instead of (=)
- Python decoding Unicode is not supported
- C# Encoding a text string with line breaks
- If a hacker changed the blog_charset to UTF-7 does that make WordPress vulnerable to further attacks?
- Encode text string being appended as query to URL [closed]
- How to stop WordPress using utf8mb4_unicode_520_ci collation?
- Add whitespace between Chinese and other letters
- How can I stop TinyMCE from converting my HTML entities to characters?
- Why WP encodes UNICODE (UTF8) containing urls? Any drawbacks of UNICODE url?
- Non-Latin Characters in permalinks
- Faulty restore of the database, encoding issue
- Remove “Category Archives: title” at the top of a category page [duplicate]
- How to encode post content as JSON?
- How to write Hebrew characters?
- What is WordPress file encoding?
- How to diagnose and keep in check encoding issues?
- add_rewrite_rule not working for language specific characters
- Query string becomes encoded when a static page is used as homepage
- Text cut off after the character 𪇆 in TinyMCE
- Emojis getting converted to “?”
- How do I change database charset when using `wpdb`
- urlencode query string in gravity forms confirmation redirect
- TinyMCE as comment editor – encoding issues
- How to get my post title to work with an apostrophe (‘s)?
- Non latin post slug truncate
- Is sanitize_title_with_dashes formatting function too liberal (in terms of accepted characters)?
- Avoid glitchy characters – my own version of the problem
- Adding inline JavaScript encoding issue
- copying text from ms word to wordpress post appears weird [closed]
- How to use Japanese characters for a single page
- esc_js() breaks unicode sequences by removing the slash ‘\’ character
- Post editor loads empty
- UTF8 Encoding problems when exporting posts
- encoded search terms with %20
- How to distinguish between a hack and an encoding error?
- Uploaded image with non-english characters is named incorrectly in upload folder
- wp_mail encode ’ in ’ in subject
- Blank spaces show as a question mark
- Outputting HTML elements through WP-API
- Email Obfuscation: Is antispambot() Acceptable? [closed]
- Problems with wierd characters and my plugin
- ✓ Checkmark Character Encoding Issue In WordPress Editor
- How to Fix Mangled Thai Characters
- Special characters in post_title replaced by ‘?’
- Encode URL for WhatsApp “click to chat” without loosing accented characters
- Plugin won’t output characters with diacritics properly
- WordPress Dutch characters encoding problem
- How Can I Concatenate A String With One Of My Custom Field Value Before Saving The Post?
- How are cookie values encoded?
- Rest API encoding of double quotes
- Character encoding issue – black diamond question marks on imported post excerpts
- Theme-based character encoding issue
- Strange special character/Latin characters
- Search terms in other language turns out to question mark and symbols
- Control character encode after using jquery autocomplete
- filter wptexturize doesn’t work on old posts titles
- TinyMCE HTML Encode Backslash
- Special characters showing in fallback font
- wp_insert_post and title not utf8 inserts with empty title?
- Non english charcters support for WP Customer Reviews
- Language selection for blog doesn’t exist?
- Modify WordPress to not replace + (plus) characters from URLs?
- wordpress shortcode url decode non Latin character