Declare UTF-8 charset — Claude Code

Without an explicit charset declaration, umlauts, emojis, and non-ASCII characters render as gibberish in some browsers and crawlers.

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Fixing this in Claude Code

Anthropic's official terminal coding agent

Claude Code can grep the whole codebase first, plan the change, then edit every affected file. Paste the prompt below into your Claude Code chat and the fix rolls out across the project in one pass.

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The prompt for Claude Code

Copy and paste this into your Claude Code chat exactly as-is.

Run Claude Code in the project root and make these exact changes, scanning the whole codebase first:

Add charset declaration

1. Add <meta charset="utf-8"> as the first element in <head>.

Why this matters

UTF-8 is the one charset everyone supports. Declaring it explicitly prevents browsers from guessing — and the guess is sometimes wrong, especially for legacy setups.

AI-generated HTML templates include this by default, but some micro-edits can drop it. A quick check avoids the dreaded "�" symbols across your content.

How to use this prompt in Claude Code

1. Open your Claude Code project.
2. Copy the prompt above with the copy button.
3. Paste into the Claude Code chat and send.
4. Review the diff, accept the changes, redeploy.
5. Verify the fix using the checklist below.

Common mistakes to avoid

error_outlinePutting the charset meta after the title — browsers may re-parse the head when they discover it, slowing paint.
error_outlineUsing `iso-8859-1` on modern sites — obsolete, breaks emoji and non-Latin characters.
error_outlineRelying on HTTP header only — in-HTML declaration is a safety net.

How to verify the fix worked

check_circleView source — `<meta charset="utf-8">` is the first element in <head>.
check_circleLighthouse → SEO → "Document has a meta charset" passes.
check_circleCheck content with umlauts, accents, and emojis — all render correctly.

Frequently asked questions

Uppercase UTF-8 vs lowercase utf-8?expand_more

Either works. Lowercase is common convention.

Is HTTP charset header enough?expand_more

Works in most cases, but the in-HTML meta is a safety net for when headers are stripped (e.g., local file viewing).

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