diff --git a/crates/oxc_linter/src/rules/unicorn/text_encoding_identifier_case.rs b/crates/oxc_linter/src/rules/unicorn/text_encoding_identifier_case.rs
index 4d5e89859f09e..fa4c86bf50389 100644
--- a/crates/oxc_linter/src/rules/unicorn/text_encoding_identifier_case.rs
+++ b/crates/oxc_linter/src/rules/unicorn/text_encoding_identifier_case.rs
@@ -46,7 +46,7 @@ declare_oxc_lint!(
     /// ```
     TextEncodingIdentifierCase,
     style,
-    pending
+    fix
 );
 
 impl Rule for TextEncodingIdentifierCase {
@@ -72,7 +72,10 @@ impl Rule for TextEncodingIdentifierCase {
             return;
         }
 
-        ctx.diagnostic(text_encoding_identifier_case_diagnostic(span, replacement, s));
+        ctx.diagnostic_with_fix(
+            text_encoding_identifier_case_diagnostic(span, replacement, s),
+            |fixer| fixer.replace(Span::new(span.start + 1, span.end - 1), replacement),
+        );
     }
 }
 
@@ -169,5 +172,31 @@ fn test() {
         r#"<META CHARSET="ASCII" />"#,
     ];
 
-    Tester::new(TextEncodingIdentifierCase::NAME, pass, fail).test_and_snapshot();
+    let fix = vec![
+        (r#""UTF-8""#, r#""utf8""#),
+        (r#""utf-8""#, r#""utf8""#),
+        (r"'utf-8'", r"'utf8'"),
+        (r#""Utf8""#, r#""utf8""#),
+        (r#""ASCII""#, r#""ascii""#),
+        (r#"fs.readFile?.(file, "UTF-8")"#, r#"fs.readFile?.(file, "utf8")"#),
+        (r#"fs?.readFile(file, "UTF-8")"#, r#"fs?.readFile(file, "utf8")"#),
+        (r#"readFile(file, "UTF-8")"#, r#"readFile(file, "utf8")"#),
+        (r#"fs.readFile(...file, "UTF-8")"#, r#"fs.readFile(...file, "utf8")"#),
+        (r#"new fs.readFile(file, "UTF-8")"#, r#"new fs.readFile(file, "utf8")"#),
+        (r#"fs.readFile(file, {encoding: "UTF-8"})"#, r#"fs.readFile(file, {encoding: "utf8"})"#),
+        (r#"fs.readFile("UTF-8")"#, r#"fs.readFile("utf8")"#),
+        (r#"fs.readFile(file, "UTF-8", () => {})"#, r#"fs.readFile(file, "utf8", () => {})"#),
+        (r#"fs.readFileSync(file, "UTF-8")"#, r#"fs.readFileSync(file, "utf8")"#),
+        (r#"fs[readFile](file, "UTF-8")"#, r#"fs[readFile](file, "utf8")"#),
+        (r#"fs["readFile"](file, "UTF-8")"#, r#"fs["readFile"](file, "utf8")"#),
+        (r#"await fs.readFile(file, "UTF-8",)"#, r#"await fs.readFile(file, "utf8",)"#),
+        (r#"fs.promises.readFile(file, "UTF-8",)"#, r#"fs.promises.readFile(file, "utf8",)"#),
+        (r#"whatever.readFile(file, "UTF-8",)"#, r#"whatever.readFile(file, "utf8",)"#),
+        (r#"<not-meta charset="utf-8" />"#, r#"<not-meta charset="utf8" />"#),
+        (r#"<meta not-charset="utf-8" />"#, r#"<meta not-charset="utf8" />"#),
+        (r#"<meta charset="ASCII" />"#, r#"<meta charset="ascii" />"#),
+        (r#"<META CHARSET="ASCII" />"#, r#"<META CHARSET="ascii" />"#),
+    ];
+
+    Tester::new(TextEncodingIdentifierCase::NAME, pass, fail).expect_fix(fix).test_and_snapshot();
 }
diff --git a/crates/oxc_linter/src/snapshots/text_encoding_identifier_case.snap b/crates/oxc_linter/src/snapshots/text_encoding_identifier_case.snap
index 698c0d3d024ea..4d44cad5143c5 100644
--- a/crates/oxc_linter/src/snapshots/text_encoding_identifier_case.snap
+++ b/crates/oxc_linter/src/snapshots/text_encoding_identifier_case.snap
@@ -6,135 +6,158 @@ source: crates/oxc_linter/src/tester.rs
  1 │ "UTF-8"
    · ───────
    ╰────
+  help: Replace `UTF-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `utf-8`.
    ╭─[text_encoding_identifier_case.tsx:1:1]
  1 │ "utf-8"
    · ───────
    ╰────
+  help: Replace `utf-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `utf-8`.
    ╭─[text_encoding_identifier_case.tsx:1:1]
  1 │ 'utf-8'
    · ───────
    ╰────
+  help: Replace `utf-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `Utf8`.
    ╭─[text_encoding_identifier_case.tsx:1:1]
  1 │ "Utf8"
    · ──────
    ╰────
+  help: Replace `Utf8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `ascii` over `ASCII`.
    ╭─[text_encoding_identifier_case.tsx:1:1]
  1 │ "ASCII"
    · ───────
    ╰────
+  help: Replace `ASCII` with `ascii`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `UTF-8`.
    ╭─[text_encoding_identifier_case.tsx:1:21]
  1 │ fs.readFile?.(file, "UTF-8")
    ·                     ───────
    ╰────
+  help: Replace `UTF-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `UTF-8`.
    ╭─[text_encoding_identifier_case.tsx:1:20]
  1 │ fs?.readFile(file, "UTF-8")
    ·                    ───────
    ╰────
+  help: Replace `UTF-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `UTF-8`.
    ╭─[text_encoding_identifier_case.tsx:1:16]
  1 │ readFile(file, "UTF-8")
    ·                ───────
    ╰────
+  help: Replace `UTF-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `UTF-8`.
    ╭─[text_encoding_identifier_case.tsx:1:22]
  1 │ fs.readFile(...file, "UTF-8")
    ·                      ───────
    ╰────
+  help: Replace `UTF-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `UTF-8`.
    ╭─[text_encoding_identifier_case.tsx:1:23]
  1 │ new fs.readFile(file, "UTF-8")
    ·                       ───────
    ╰────
+  help: Replace `UTF-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `UTF-8`.
    ╭─[text_encoding_identifier_case.tsx:1:30]
  1 │ fs.readFile(file, {encoding: "UTF-8"})
    ·                              ───────
    ╰────
+  help: Replace `UTF-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `UTF-8`.
    ╭─[text_encoding_identifier_case.tsx:1:13]
  1 │ fs.readFile("UTF-8")
    ·             ───────
    ╰────
+  help: Replace `UTF-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `UTF-8`.
    ╭─[text_encoding_identifier_case.tsx:1:19]
  1 │ fs.readFile(file, "UTF-8", () => {})
    ·                   ───────
    ╰────
+  help: Replace `UTF-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `UTF-8`.
    ╭─[text_encoding_identifier_case.tsx:1:23]
  1 │ fs.readFileSync(file, "UTF-8")
    ·                       ───────
    ╰────
+  help: Replace `UTF-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `UTF-8`.
    ╭─[text_encoding_identifier_case.tsx:1:20]
  1 │ fs[readFile](file, "UTF-8")
    ·                    ───────
    ╰────
+  help: Replace `UTF-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `UTF-8`.
    ╭─[text_encoding_identifier_case.tsx:1:22]
  1 │ fs["readFile"](file, "UTF-8")
    ·                      ───────
    ╰────
+  help: Replace `UTF-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `UTF-8`.
    ╭─[text_encoding_identifier_case.tsx:1:25]
  1 │ await fs.readFile(file, "UTF-8",)
    ·                         ───────
    ╰────
+  help: Replace `UTF-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `UTF-8`.
    ╭─[text_encoding_identifier_case.tsx:1:28]
  1 │ fs.promises.readFile(file, "UTF-8",)
    ·                            ───────
    ╰────
+  help: Replace `UTF-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `UTF-8`.
    ╭─[text_encoding_identifier_case.tsx:1:25]
  1 │ whatever.readFile(file, "UTF-8",)
    ·                         ───────
    ╰────
+  help: Replace `UTF-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `utf-8`.
    ╭─[text_encoding_identifier_case.tsx:1:19]
  1 │ <not-meta charset="utf-8" />
    ·                   ───────
    ╰────
+  help: Replace `utf-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `utf8` over `utf-8`.
    ╭─[text_encoding_identifier_case.tsx:1:19]
  1 │ <meta not-charset="utf-8" />
    ·                   ───────
    ╰────
+  help: Replace `utf-8` with `utf8`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `ascii` over `ASCII`.
    ╭─[text_encoding_identifier_case.tsx:1:15]
  1 │ <meta charset="ASCII" />
    ·               ───────
    ╰────
+  help: Replace `ASCII` with `ascii`.
 
   ⚠ eslint-plugin-unicorn(text-encoding-identifier-case): Prefer `ascii` over `ASCII`.
    ╭─[text_encoding_identifier_case.tsx:1:15]
  1 │ <META CHARSET="ASCII" />
    ·               ───────
    ╰────
+  help: Replace `ASCII` with `ascii`.