diff --git a/linkcheck/checker/fileurl.py b/linkcheck/checker/fileurl.py
index f93c4e9b..725c0476 100644
--- a/linkcheck/checker/fileurl.py
+++ b/linkcheck/checker/fileurl.py
@@ -197,8 +197,8 @@ class FileUrl(urlbase.UrlBase):
         """
         if self.parent_url is not None and not self.parent_url.startswith("file:"):
             msg = _(
-                "local files are only checked without parent URL or when "
-                "the parent URL is also a file"
+                "local files are only checked without parent URL or when"
+                " the parent URL is also a file"
             )
             raise LinkCheckerError(msg)
         if self.is_directory():
@@ -221,9 +221,9 @@ class FileUrl(urlbase.UrlBase):
         if path != realpath:
             self.add_warning(
                 _(
-                    "The URL path %(path)r is not the same as the "
-                    "system path %(realpath)r. You should always use "
-                    "the system path in URLs."
+                    "The URL path %(path)r is not the same as the"
+                    " system path %(realpath)r. You should always use"
+                    " the system path in URLs."
                 )
                 % {"path": path, "realpath": realpath},
                 tag=WARN_FILE_SYSTEM_PATH,
diff --git a/linkcheck/checker/mailtourl.py b/linkcheck/checker/mailtourl.py
index cacf5ef7..2833cb18 100644
--- a/linkcheck/checker/mailtourl.py
+++ b/linkcheck/checker/mailtourl.py
@@ -154,8 +154,8 @@ class MailtoUrl(urlbase.UrlBase):
         if len(mail) > 256:
             self.set_result(
                 _(
-                    "Mail address `%(addr)s' too long. Allowed 256 chars, "
-                    "was %(length)d chars."
+                    "Mail address `%(addr)s' too long. Allowed 256 chars,"
+                    " was %(length)d chars."
                 )
                 % {"addr": mail, "length": len(mail)},
                 valid=False,
@@ -188,8 +188,8 @@ class MailtoUrl(urlbase.UrlBase):
         if len(local) > 64:
             self.set_result(
                 _(
-                    "Local part of mail address `%(addr)s' too long. "
-                    "Allowed 64 chars, was %(length)d chars."
+                    "Local part of mail address `%(addr)s' too long."
+                    " Allowed 64 chars, was %(length)d chars."
                 )
                 % {"addr": mail, "length": len(local)},
                 valid=False,
@@ -199,8 +199,8 @@ class MailtoUrl(urlbase.UrlBase):
         if len(domain) > 255:
             self.set_result(
                 _(
-                    "Domain part of mail address `%(addr)s' too long. "
-                    "Allowed 255 chars, was %(length)d chars."
+                    "Domain part of mail address `%(addr)s' too long."
+                    " Allowed 255 chars, was %(length)d chars."
                 )
                 % {"addr": mail, "length": len(local)},
                 valid=False,
@@ -249,8 +249,8 @@ class MailtoUrl(urlbase.UrlBase):
                 if char in local.replace("\\%s" % char, ""):
                     self.set_result(
                         _(
-                            "Local part of mail address `%(addr)s' contains "
-                            "unquoted character `%(char)s."
+                            "Local part of mail address `%(addr)s' contains"
+                            " unquoted character `%(char)s."
                         )
                         % {"addr": mail, "char": char},
                         valid=False,
diff --git a/linkcheck/configuration/__init__.py b/linkcheck/configuration/__init__.py
index b7ef6005..63458340 100644
--- a/linkcheck/configuration/__init__.py
+++ b/linkcheck/configuration/__init__.py
@@ -432,8 +432,8 @@ def get_user_config():
             shutil.copy(initialconf, userconf)
         except Exception as errmsg:
             msg = _(
-                "could not copy initial configuration file %(src)r "
-                "to %(dst)r: %(errmsg)r"
+                "could not copy initial configuration file %(src)r"
+                " to %(dst)r: %(errmsg)r"
             )
             args = dict(src=initialconf, dst=userconf, errmsg=errmsg)
             log.warn(LOG_CHECK, msg % args)
diff --git a/linkcheck/configuration/confparse.py b/linkcheck/configuration/confparse.py
index 562aebcd..1b8ff9e6 100644
--- a/linkcheck/configuration/confparse.py
+++ b/linkcheck/configuration/confparse.py
@@ -233,9 +233,9 @@ class LCConfigParser(RawConfigParser):
         if fileutil.is_accessable_by_others(fn):
             log.warn(
                 LOG_CHECK,
-                "The configuration file %s contains password information (in "
-                "section [%s] and options %s) and the file is readable by "
-                "others. Please make the file only readable by you.",
+                "The configuration file %s contains password information (in"
+                " section [%s] and options %s) and the file is readable by"
+                " others. Please make the file only readable by you.",
                 fn,
                 section,
                 fields,
@@ -246,8 +246,8 @@ class LCConfigParser(RawConfigParser):
                 log.warn(
                     LOG_CHECK,
                     _(
-                        "See http://support.microsoft.com/kb/308419 for "
-                        "more info on setting file permissions."
+                        "See http://support.microsoft.com/kb/308419 for"
+                        " more info on setting file permissions."
                     ),
                 )
 
diff --git a/linkcheck/director/aggregator.py b/linkcheck/director/aggregator.py
index a18a3bc0..13c5d753 100644
--- a/linkcheck/director/aggregator.py
+++ b/linkcheck/director/aggregator.py
@@ -175,8 +175,8 @@ class Aggregate:
         log.info(
             LOG_CHECK,
             _(
-                "%(num)d URLs are still active. After a timeout of %(timeout)s "
-                "the active URLs will stop."
+                "%(num)d URLs are still active. After a timeout of %(timeout)s"
+                " the active URLs will stop."
             )
             % args,
         )
diff --git a/linkcheck/logger/html.py b/linkcheck/logger/html.py
index ecba706e..569f1370 100644
--- a/linkcheck/logger/html.py
+++ b/linkcheck/logger/html.py
@@ -295,8 +295,7 @@ class HtmlLogger(_Logger):
         sep = "<br/>" + os.linesep
         text = sep.join(html.escape(x[1]) for x in url_data.warnings)
         self.writeln(
-            '<tr><td class="warning" '
-            + 'valign="top">'
+            '<tr><td class="warning" valign="top">'
             + self.part("warning")
             + '</td><td class="warning">'
             + text
diff --git a/linkcheck/plugins/locationinfo.py b/linkcheck/plugins/locationinfo.py
index e92e794d..32c2e028 100644
--- a/linkcheck/plugins/locationinfo.py
+++ b/linkcheck/plugins/locationinfo.py
@@ -91,7 +91,7 @@ if geoip_dat:
     else:
         def get_geoip_record(host):
             return {
-                     'country_name': geoip.country_name_by_name(host)
+                    'country_name': geoip.country_name_by_name(host)
             }
 
 
diff --git a/linkcheck/robotparser2.py b/linkcheck/robotparser2.py
index 53b35401..d4ca6ee2 100644
--- a/linkcheck/robotparser2.py
+++ b/linkcheck/robotparser2.py
@@ -154,8 +154,8 @@ class RobotFileParser:
                 if state == 1:
                     log.debug(
                         LOG_CHECK,
-                        "%r line %d: allow or disallow directives without any "
-                        "user-agent line",
+                        "%r line %d: allow or disallow directives without any"
+                        " user-agent line",
                         self.url,
                         linenumber,
                     )
@@ -180,8 +180,8 @@ class RobotFileParser:
                     if state == 2:
                         log.debug(
                             LOG_CHECK,
-                            "%r line %d: missing blank line before "
-                            "user-agent directive",
+                            "%r line %d: missing blank line before"
+                            " user-agent directive",
                             self.url,
                             linenumber,
                         )
diff --git a/linkcheck/strformat.py b/linkcheck/strformat.py
index a95a7ddc..fa12f610 100644
--- a/linkcheck/strformat.py
+++ b/linkcheck/strformat.py
@@ -338,8 +338,8 @@ def format_feature_warning(**kwargs):
     """
     return (
         _(
-            "Could not import %(module)s for %(feature)s. "
-            "Install %(module)s from %(url)s to use this feature."
+            "Could not import %(module)s for %(feature)s."
+            " Install %(module)s from %(url)s to use this feature."
         )
         % kwargs
     )
diff --git a/linkcheck/url.py b/linkcheck/url.py
index fab2e67b..13ae3f91 100644
--- a/linkcheck/url.py
+++ b/linkcheck/url.py
@@ -60,12 +60,16 @@ _basic = {
     "_hex_full": r"0-9a-f",
     "_part": r"([a-z0-9][-a-z0-9]{0,61}|[a-z])",
 }
-_safe_char = r"([a-z0-9%(_path)s\+]|" r"(%%[%(_hex_safe)s][%(_hex_full)s]))" % _basic
+_safe_char = (
+    r"([a-z0-9%(_path)s\+]|"
+    r"(%%[%(_hex_safe)s][%(_hex_full)s]))" % _basic
+)
 _safe_scheme_pattern = r"(https?|ftp)"
 _safe_domain_pattern = r"(%(_part)s(\.%(_part)s)*\.?)" % _basic
 _safe_host_pattern = _safe_domain_pattern + r"(:(80|8080|8000|443))?" % _basic
 _safe_path_pattern = (
-    r"((/([a-z0-9%(_path)s]|" r"(%%[%(_hex_safe)s][%(_hex_full)s]))+)*/?)" % _basic
+    r"((/([a-z0-9%(_path)s]|"
+    r"(%%[%(_hex_safe)s][%(_hex_full)s]))+)*/?)" % _basic
 )
 _safe_fragment_pattern = r"%s*" % _safe_char
 _safe_cgi = r"%s+(=(%s|/)+)?" % (_safe_char, _safe_char)
diff --git a/setup.cfg b/setup.cfg
index 14da2d56..5f733dd2 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -47,6 +47,7 @@ per-file-ignores =
     linkcheck/ftpparse.py: E501
     tests/test_ftpparse.py: E501
 # F821 undefined name
+# https://github.com/PyCQA/pyflakes/issues/548
     linkcheck/logger/__init__.py: F821
 extend-ignore =
 # https://pep8.readthedocs.org/en/latest/intro.html#error-codes