diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index c10bdd40491..99747382e95 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -135,6 +135,15 @@ jobs:
             cp -rv $name addons
           done
 
+      - name: Make links within doc relative
+        run: |
+          python grass/utils/replace_links.py \
+            --target-dirs "" addons \
+            --new-base-url "" \
+            --verbose \
+            https://grass.osgeo.org/grass-stable/manuals \
+            "$MKDOCS_DIR/source/"
+
       - name: Get mkdocs
         run: |
           pip install -r "grass/man/mkdocs/requirements.txt"
diff --git a/utils/replace_links.py b/utils/replace_links.py
new file mode 100755
index 00000000000..0f6374c2521
--- /dev/null
+++ b/utils/replace_links.py
@@ -0,0 +1,121 @@
+#!/usr/bin/env python3
+
+import re
+import argparse
+import difflib
+from pathlib import Path
+
+
+def replace_links_in_markdown(
+    filepath, replace_url, replacement, dry_run, verbose, diff
+):
+    content = Path(filepath).read_text()
+    # Match Markdown links/images with multiline labels.
+    pattern = re.compile(
+        r"(!?\[.*?\])\(\s*" + re.escape(replace_url) + r"([^)]*)?\s*\)", re.DOTALL
+    )
+    if pattern.search(content):
+        new_content = pattern.sub(
+            lambda m: f"{m.group(1)}({replacement}{m.group(2) or ''})", content
+        )
+        if not dry_run:
+            Path(filepath).write_text(new_content)
+        if (verbose or dry_run) and not diff:
+            text = "Would update" if dry_run else "Updated"
+            print(f"{text}: {filepath}")
+        if diff:
+            difference = difflib.unified_diff(
+                content.splitlines(),
+                new_content.splitlines(),
+                fromfile=f"a/{filepath}",
+                tofile=f"b/{filepath}",
+                lineterm="",
+            )
+            print("\n".join(difference))
+
+
+def ensure_trailing_slash(url):
+    return url.rstrip("/") + "/" if url else ""
+
+
+def replace_grass_links(args):
+    # Normalize URL format.
+    replace_url = ensure_trailing_slash(args.replace_url)
+    new_base_url = ensure_trailing_slash(args.new_base_url)
+
+    for subdir in args.target_dirs:
+        dir_path = Path(args.root_dir) / subdir
+        replacement = new_base_url if subdir == "" else f"{new_base_url}.."
+        # This assumes that the directory exists.
+        for file_path in Path.iterdir(dir_path):
+            if file_path.is_file() and file_path.suffix == args.file_ext:
+                replace_links_in_markdown(
+                    file_path,
+                    replace_url,
+                    replacement,
+                    dry_run=args.dry_run,
+                    diff=args.diff,
+                    verbose=args.verbose,
+                )
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Replace GRASS manual URLs in Markdown links with relative or custom paths.",
+        epilog="""
+Example:
+  python replace_grass_links.py \\
+    "https://example.org/manuals" \\
+    ./docs \\
+    --target-dirs "" addons libpython \\
+    --new-base-url "" \\
+    --file-ext .md \\
+    --verbose
+""",
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+    )
+    parser.add_argument(
+        "replace_url",
+        default="",
+        help="URL string to replace (default: %(default)s)",
+    )
+    parser.add_argument(
+        "root_dir",
+        help="Path to the root directory containing Markdown files and subdirectories.",
+    )
+    parser.add_argument(
+        "--new-base-url",
+        default="",
+        help="Replacement string for the base URL (default: empty for relative links)",
+    )
+    parser.add_argument(
+        "--target-dirs",
+        nargs="+",
+        default=[""],
+        help="Subdirectories to process relative to root (default: %(default)s)",
+    )
+    parser.add_argument(
+        "--file-ext",
+        default=".md",
+        help="File extension to process (default: %(default)s)",
+    )
+    parser.add_argument(
+        "--dry-run", action="store_true", help="Preview changes without modifying files"
+    )
+    parser.add_argument(
+        "--diff",
+        action="store_true",
+        help="Print difference between new and old content",
+    )
+    parser.add_argument(
+        "--verbose",
+        action="store_true",
+        help="Print every file that gets (or would be) updated",
+    )
+
+    args = parser.parse_args()
+    replace_grass_links(args)
+
+
+if __name__ == "__main__":
+    main()