diff --git a/scripts/generate_site.py b/scripts/generate_site.py
index ee0115e46..a627dda60 100644
--- a/scripts/generate_site.py
+++ b/scripts/generate_site.py
@@ -4517,8 +4517,9 @@ def generate_files_page() -> str:
         "",
         '<form class="rb-file-lookup" action="./" method="get">',
         '<label for="rb-hash">SHA1, MD5, CRC32 or SHA256</label> ',
+        # No pattern: the line md5sum or certutil prints is taken whole, and
+        # the page reads the hash out of it.
         '<input id="rb-hash" name="hash" size="66" autocomplete="off" spellcheck="false" '
-        'pattern="\\s*(0x)?([0-9a-fA-F]{8}|[0-9a-fA-F]{32}|[0-9a-fA-F]{40}|[0-9a-fA-F]{64})\\s*" '
         'required> ',
         '<button type="submit">Find</button>',
         "</form>",
diff --git a/tests/test_site_r4_components.py b/tests/test_site_r4_components.py
index ea5b6b5e4..03df811e6 100644
--- a/tests/test_site_r4_components.py
+++ b/tests/test_site_r4_components.py
@@ -265,5 +265,38 @@ class CopyButtonInTheHeader(unittest.TestCase):
         self.assertIn(".expressive-code .frame.has-title .copy { inset-block-start:", source)
 
 
+class AChecksumLineIsAHash(unittest.TestCase):
+    """The lookup and the search took a bare hash only: the line md5sum,
+    shasum --tag, certutil or Get-FileHash prints was refused whole."""
+
+    def test_the_hash_is_read_out_of_the_line(self):
+        source = _read(SITE_TS)
+        code = (source[source.index("const HASH_LENGTHS"):source.index("\n", source.index("const HASH_LENGTHS"))]
+                + source[source.index("const normalizeHash"):source.index("// Tables")])
+        md5, sha1 = "490f666e1afb15b7362b406ed1cea246", "b05def971d8ec59f346f2d9ac21fb742e3eb6917"
+        spaced = " ".join(sha1[i:i + 2] for i in range(0, 40, 2))
+        cases = [
+            f"{md5}  scph5501.bin",
+            f"SHA1 (scph5501.bin) = {sha1}",
+            f"SHA1 hash of scph5501.bin:\r\n{spaced}\r\nCertUtil: -hashfile command completed successfully.",
+            f"Algorithm Hash Path\n--------- ---- ----\nSHA1 {sha1.upper()} C:\\bios\\scph5501.bin",
+            f"  0x{md5.upper()} ",
+            "8d8cb7e4",
+            "deadbeef.bin",
+            f"{md5} {sha1}",
+        ]
+        out = _node(code + f"console.log(JSON.stringify({json.dumps(cases)}.map((c) => "
+                           "[normalizeHash(c), isHash(normalizeHash(c))])));")
+        self.assertEqual(json.loads(out), [
+            [md5, True], [sha1, True], [sha1, True], [sha1, True], [md5, True],
+            ["8d8cb7e4", True], ["deadbeef.bin", False], [md5 + sha1, False],
+        ])
+
+    def test_the_form_takes_the_line(self):
+        source = _read(REPO_ROOT / "scripts" / "generate_site.py")
+        start = source.index('<input id="rb-hash"')
+        self.assertNotIn("pattern=", source[start:source.index("required>", start)])
+
+
 if __name__ == "__main__":
     unittest.main()
diff --git a/website/src/scripts/site.ts b/website/src/scripts/site.ts
index aa1252de9..469aebee2 100644
--- a/website/src/scripts/site.ts
+++ b/website/src/scripts/site.ts
@@ -24,7 +24,21 @@ type Item = {
 };
 
 const siteRoot = () => new URL(import.meta.env.BASE_URL.replace(/\/?$/, '/'), location.origin);
-const normalizeHash = (raw: string) => raw.trim().toLowerCase().replace(/^0x/, '').replace(/\s+/g, '');
+// A pasted hash, or the line a checksum tool prints around it: md5sum
+// (`<hash>  <file>`), BSD and shasum --tag (`SHA1 (<file>) = <hash>`),
+// certutil (the bytes spaced on a line of their own), Get-FileHash's table.
+// The one word of an MD5, SHA1 or SHA256's length is taken: an 8-character
+// word in a file name searched for is no CRC32. None or two, and the text is
+// kept as typed, which isHash refuses.
+const normalizeHash = (raw: string) => {
+	const text = raw.trim().toLowerCase();
+	const bare = text.replace(/^0x/, '').replace(/\s+/g, '');
+	if (/^[0-9a-f]*$/.test(bare)) return bare;
+	const words = text.split('\n').flatMap((line) =>
+		/^[0-9a-f ]+$/.test(line.trim()) ? [line.replace(/\s+/g, '')] : (line.match(/\b[0-9a-f]+\b/g) ?? []));
+	const found = [...new Set(words.filter((word) => word.length > 8 && word.length in HASH_LENGTHS))];
+	return found.length === 1 ? found[0] : bare;
+};
 const isHash = (value: string) => /^[0-9a-f]+$/.test(value) && value.length in HASH_LENGTHS;
 
 // Tables