diff --git a/src/base/attr_line.cc b/src/base/attr_line.cc
index 05cf468c..69b547b2 100644
--- a/src/base/attr_line.cc
+++ b/src/base/attr_line.cc
@@ -174,7 +174,7 @@ attr_line_t::insert(size_t index,
 
     static const pcrepp SPACE_RE(R"(\s?)");
 
-    ssize_t starting_line_index = this->al_string.rfind('\n', index);
+    auto starting_line_index = this->al_string.rfind('\n', index);
     if (starting_line_index == std::string::npos) {
         starting_line_index = 0;
     } else {
@@ -186,7 +186,7 @@ attr_line_t::insert(size_t index,
     auto text_to_wrap
         = string_fragment{this->al_string.data(), (int) starting_line_index};
     string_fragment last_word;
-    size_t line_ch_count = 0;
+    ssize_t line_ch_count = 0;
     auto needs_indent = false;
 
     while (!text_to_wrap.empty()) {
@@ -444,7 +444,7 @@ attr_line_t::erase(size_t pos, size_t len)
 }
 
 attr_line_t&
-attr_line_t::pad_to(size_t size)
+attr_line_t::pad_to(ssize_t size)
 {
     const auto curr_len = this->utf8_length_or_length();
 
diff --git a/src/base/attr_line.hh b/src/base/attr_line.hh
index 022e3baf..fe211825 100644
--- a/src/base/attr_line.hh
+++ b/src/base/attr_line.hh
@@ -647,7 +647,7 @@ public:
 
     attr_line_t& right_justify(unsigned long width);
 
-    attr_line_t& pad_to(size_t size);
+    attr_line_t& pad_to(ssize_t size);
 
     ssize_t length() const
     {
diff --git a/src/base/date_time_scanner.cc b/src/base/date_time_scanner.cc
index 91284994..bca6dfbc 100644
--- a/src/base/date_time_scanner.cc
+++ b/src/base/date_time_scanner.cc
@@ -211,7 +211,8 @@ date_time_scanner::scan(const char* time_dest,
         retval = nullptr;
     }
 
-    if (retval != nullptr && (retval - time_dest) < time_len) {
+    if (retval != nullptr && static_cast<size_t>(retval - time_dest) < time_len)
+    {
         /* Try to pull out the milli/micro-second value. */
         if (retval[0] == '.' || retval[0] == ',') {
             off_t off = (retval - time_dest) + 1;
diff --git a/src/base/intern_string.cc b/src/base/intern_string.cc
index 8a842b05..b8f232f4 100644
--- a/src/base/intern_string.cc
+++ b/src/base/intern_string.cc
@@ -97,8 +97,9 @@ intern_string::lookup(const char* str, ssize_t len) noexcept
 
         curr = tab->it_table[h];
         while (curr != nullptr) {
-            if (curr->is_str.size() == len
-                && strncmp(curr->is_str.c_str(), str, len) == 0) {
+            if (static_cast<ssize_t>(curr->is_str.size()) == len
+                && strncmp(curr->is_str.c_str(), str, len) == 0)
+            {
                 return curr;
             }
             curr = curr->is_next;
@@ -232,3 +233,20 @@ string_fragment::split_lines() const
 
     return retval;
 }
+
+Result<ssize_t, const char*>
+string_fragment::utf8_length() const
+{
+    ssize_t retval = 0;
+
+    for (ssize_t byte_index = this->sf_begin; byte_index < this->sf_end;) {
+        auto ch_size = TRY(ww898::utf::utf8::char_size([this, byte_index]() {
+            return std::make_pair(this->sf_string[byte_index],
+                                  this->sf_end - byte_index);
+        }));
+        byte_index += ch_size;
+        retval += 1;
+    }
+
+    return Ok(retval);
+}
diff --git a/src/base/intern_string.hh b/src/base/intern_string.hh
index 52e903bb..ee00ba55 100644
--- a/src/base/intern_string.hh
+++ b/src/base/intern_string.hh
@@ -65,22 +65,7 @@ struct string_fragment {
 
     int length() const { return this->sf_end - this->sf_begin; }
 
-    Result<size_t, const char*> utf8_length() const
-    {
-        size_t retval = 0;
-
-        for (ssize_t byte_index = this->sf_begin; byte_index < this->sf_end;) {
-            auto ch_size
-                = TRY(ww898::utf::utf8::char_size([this, byte_index]() {
-                      return std::make_pair(this->sf_string[byte_index],
-                                            this->sf_end - byte_index);
-                  }));
-            byte_index += ch_size;
-            retval += 1;
-        }
-
-        return Ok(retval);
-    }
+    Result<ssize_t, const char*> utf8_length() const;
 
     const char* data() const { return &this->sf_string[this->sf_begin]; }
 
diff --git a/src/base/lnav.console.cc b/src/base/lnav.console.cc
index a28921c9..3a10bc08 100644
--- a/src/base/lnav.console.cc
+++ b/src/base/lnav.console.cc
@@ -245,7 +245,7 @@ println(FILE* file, const attr_line_t& al)
         return;
     }
 
-    std::set<int> points = {0, (int) al.length()};
+    std::set<size_t> points = {0, static_cast<size_t>(al.length())};
 
     for (const auto& attr : al.get_attrs()) {
         if (!attr.sa_range.is_valid()) {
@@ -257,7 +257,7 @@ println(FILE* file, const attr_line_t& al)
         }
     }
 
-    nonstd::optional<int> last_point;
+    nonstd::optional<size_t> last_point;
     for (const auto& point : points) {
         if (last_point) {
             auto default_fg_style = fmt::text_style{};
diff --git a/src/breadcrumb_curses.cc b/src/breadcrumb_curses.cc
index e83f6d3d..0490939e 100644
--- a/src/breadcrumb_curses.cc
+++ b/src/breadcrumb_curses.cc
@@ -58,7 +58,7 @@ breadcrumb_curses::do_update()
 
     size_t crumb_index = 0;
     size_t sel_crumb_offset = 0;
-    auto width = getmaxx(this->bc_window);
+    auto width = static_cast<size_t>(getmaxx(this->bc_window));
     auto crumbs = this->bc_focused_crumbs.empty() ? this->bc_line_source()
                                                   : this->bc_focused_crumbs;
     attr_line_t crumbs_line;
@@ -91,7 +91,7 @@ breadcrumb_curses::do_update()
         crumbs_line.append("\u276d"_breadcrumb);
     }
 
-    line_range lr{0, width};
+    line_range lr{0, static_cast<int>(width)};
     view_curses::mvwattrline(
         this->bc_window, this->bc_y, 0, crumbs_line, lr, role_t::VCR_STATUS);
 
@@ -159,7 +159,9 @@ breadcrumb_curses::reload_data()
                      },
                      selected_crumb_ref.c_display_value.length());
 
-    if (selected_crumb_ref.c_search_placeholder.size() > width) {
+    if (static_cast<ssize_t>(selected_crumb_ref.c_search_placeholder.size())
+        > width)
+    {
         width = selected_crumb_ref.c_search_placeholder.size();
     }
     this->bc_match_view.set_height(vis_line_t(
@@ -303,7 +305,8 @@ breadcrumb_curses::perform_selection(
     auto& selected_crumb_ref
         = this->bc_focused_crumbs[this->bc_selected_crumb.value()];
     auto match_sel = this->bc_match_view.get_selection();
-    if (match_sel >= 0 && match_sel < this->bc_similar_values.size()) {
+    if (match_sel >= 0
+        && match_sel < vis_line_t(this->bc_similar_values.size())) {
         const auto& new_value = this->bc_similar_values[match_sel].p_key;
 
         switch (behavior) {
diff --git a/src/document.sections.cc b/src/document.sections.cc
index a06254f4..3ba7154b 100644
--- a/src/document.sections.cc
+++ b/src/document.sections.cc
@@ -123,7 +123,7 @@ discover_metadata(const attr_line_t& al)
         {
         }
 
-        uint32_t oi_level;
+        int32_t oi_level;
         file_off_t oi_start;
         section_key_t oi_id;
         std::unique_ptr<hier_node> oi_node{std::make_unique<hier_node>()};
diff --git a/src/input_dispatcher.cc b/src/input_dispatcher.cc
index b2d174ab..62c1f40f 100644
--- a/src/input_dispatcher.cc
+++ b/src/input_dispatcher.cc
@@ -169,7 +169,9 @@ input_dispatcher::reset_escape_buffer(int ch,
 void
 input_dispatcher::append_to_escape_buffer(int ch)
 {
-    if (this->id_escape_index < (sizeof(this->id_escape_buffer) - 1)) {
+    if (this->id_escape_index
+        < static_cast<ssize_t>(sizeof(this->id_escape_buffer) - 1))
+    {
         this->id_escape_buffer[this->id_escape_index++] = static_cast<char>(ch);
         this->id_escape_buffer[this->id_escape_index] = '\0';
     }
diff --git a/src/lnav_util.cc b/src/lnav_util.cc
index 6b4673c9..30429fda 100644
--- a/src/lnav_util.cc
+++ b/src/lnav_util.cc
@@ -350,7 +350,9 @@ static const typed_json_path_container<console::user_message>
             .with_obj_provider<console::snippet, console::user_message>(
                 [](const yajlpp_provider_context& ypc,
                    console::user_message* root) {
-                    root->um_snippets.resize(ypc.ypc_index + 1);
+                    if (ypc.ypc_index >= root->um_snippets.size()) {
+                        root->um_snippets.resize(ypc.ypc_index + 1);
+                    }
 
                     return &root->um_snippets[ypc.ypc_index];
                 })
diff --git a/src/log_format.cc b/src/log_format.cc
index ed5c3f7b..e1cdf104 100644
--- a/src/log_format.cc
+++ b/src/log_format.cc
@@ -2036,7 +2036,7 @@ external_log_format::build(std::vector<lnav::console::user_message>& errors)
                 pcre_input pi_full(elf_sample.s_line.pp_value);
 
                 if (!pat.p_pcre->match(pc_full, pi_full)
-                    || pc_full.all()->length()
+                    || static_cast<size_t>(pc_full.all()->length())
                         != elf_sample.s_line.pp_value.length())
                 {
                     errors.emplace_back(
diff --git a/src/log_vtab_impl.cc b/src/log_vtab_impl.cc
index 0b4dbc56..cad16ba8 100644
--- a/src/log_vtab_impl.cc
+++ b/src/log_vtab_impl.cc
@@ -683,7 +683,7 @@ vt_column(sqlite3_vtab_cursor* cur, sqlite3_context* ctx, int col)
                         lf, line_number, vc->log_msg, vc->line_values);
                 }
 
-                size_t sub_col = col - VT_COL_MAX;
+                int sub_col = col - VT_COL_MAX;
                 std::vector<logline_value>::iterator lv_iter;
 
                 lv_iter = find_if(vc->line_values.begin(),
diff --git a/src/logfile.cfg.hh b/src/logfile.cfg.hh
index 65ff7c54..f249d113 100644
--- a/src/logfile.cfg.hh
+++ b/src/logfile.cfg.hh
@@ -36,7 +36,7 @@ namespace lnav {
 namespace logfile {
 
 struct config {
-    int64_t lc_max_unrecognized_lines{15000};
+    uint64_t lc_max_unrecognized_lines{15000};
 };
 
 }  // namespace logfile
diff --git a/src/logfile_sub_source.cc b/src/logfile_sub_source.cc
index 8bc848fd..d323bfc5 100644
--- a/src/logfile_sub_source.cc
+++ b/src/logfile_sub_source.cc
@@ -1303,7 +1303,9 @@ logfile_sub_source::set_sql_marker(std::string stmt_str, sqlite3_stmt* stmt)
     if (this->lss_index_delegate) {
         this->lss_index_delegate->index_start(*this);
     }
-    for (auto row = 0_vl; row < this->lss_filtered_index.size(); row += 1_vl) {
+    for (auto row = 0_vl; row < vis_line_t(this->lss_filtered_index.size());
+         row += 1_vl)
+    {
         auto cl = this->at(row);
         auto ld = this->find_data(cl);
         auto ll = (*ld)->get_file()->begin() + cl;
@@ -1919,7 +1921,7 @@ logline_window::end()
 logline_window::logmsg_info::logmsg_info(logfile_sub_source& lss, vis_line_t vl)
     : li_source(lss), li_line(vl)
 {
-    if (this->li_line < this->li_source.text_line_count()) {
+    if (this->li_line < vis_line_t(this->li_source.text_line_count())) {
         while (true) {
             auto pair_opt = this->li_source.find_line_with_file(vl);
 
@@ -1948,7 +1950,7 @@ logline_window::logmsg_info::next_msg()
     this->li_string_attrs.clear();
     this->li_line_values.clear();
     ++this->li_line;
-    while (this->li_line < this->li_source.text_line_count()) {
+    while (this->li_line < vis_line_t(this->li_source.text_line_count())) {
         auto pair_opt = this->li_source.find_line_with_file(this->li_line);
 
         if (!pair_opt) {
diff --git a/src/logfile_sub_source.hh b/src/logfile_sub_source.hh
index b0941e9f..4c555150 100644
--- a/src/logfile_sub_source.hh
+++ b/src/logfile_sub_source.hh
@@ -563,7 +563,7 @@ public:
     nonstd::optional<std::pair<std::shared_ptr<logfile>, logfile::iterator>>
     find_line_with_file(vis_line_t vl) const
     {
-        if (vl >= 0_vl && vl <= this->lss_filtered_index.size()) {
+        if (vl >= 0_vl && vl <= vis_line_t(this->lss_filtered_index.size())) {
             return this->find_line_with_file(this->at(vl));
         }
 
diff --git a/src/sysclip.cfg.hh b/src/sysclip.cfg.hh
index 04622eb1..238299b7 100644
--- a/src/sysclip.cfg.hh
+++ b/src/sysclip.cfg.hh
@@ -35,6 +35,7 @@
 #include <map>
 #include <string>
 
+#include "base/lnav_log.hh"
 #include "sysclip.hh"
 
 namespace sysclip {
@@ -51,6 +52,8 @@ struct clip_commands {
             case op_t::READ:
                 return this->cc_read;
         }
+
+        ensure(false);
     }
 };
 
@@ -67,6 +70,8 @@ struct clipboard {
             case type_t::FIND:
                 return this->c_find;
         }
+
+        ensure(false);
     }
 };
 
diff --git a/src/view_helpers.cc b/src/view_helpers.cc
index 6f4e2e6e..57defeaf 100644
--- a/src/view_helpers.cc
+++ b/src/view_helpers.cc
@@ -129,7 +129,7 @@ public:
     {
         text_sub_source::text_crumbs_for_line(line, crumbs);
 
-        if (line < 0 || line > this->tds_lines.size()) {
+        if (line < 0 || static_cast<size_t>(line) > this->tds_lines.size()) {
             return;
         }
 
diff --git a/src/yajlpp/yajlpp.cc b/src/yajlpp/yajlpp.cc
index 63cb4011..773678fd 100644
--- a/src/yajlpp/yajlpp.cc
+++ b/src/yajlpp/yajlpp.cc
@@ -88,7 +88,7 @@ json_path_handler_base::gen(yajlpp_gen_context& ygc, yajl_gen handle) const
             pcre_context_static<30> pc;
             pcre_input pi("");
 
-            yajlpp_provider_context ypc{{pc, pi}, static_cast<int>(index)};
+            yajlpp_provider_context ypc{{pc, pi}, index};
             yajlpp_gen_context elem_ygc(handle, *this->jph_children);
             elem_ygc.ygc_depth = 1;
             elem_ygc.ygc_obj_stack.push(
@@ -127,10 +127,12 @@ json_path_handler_base::gen(yajlpp_gen_context& ygc, yajl_gen handle) const
 
                 this->jph_regex.match(pc, pi);
                 ygc.ygc_obj_stack.push(this->jph_obj_provider(
-                    {{pc, pi}, -1}, ygc.ygc_obj_stack.top()));
+                    {{pc, pi}, yajlpp_provider_context::nindex},
+                    ygc.ygc_obj_stack.top()));
                 if (!ygc.ygc_default_stack.empty()) {
                     ygc.ygc_default_stack.push(this->jph_obj_provider(
-                        {{pc, pi}, -1}, ygc.ygc_default_stack.top()));
+                        {{pc, pi}, yajlpp_provider_context::nindex},
+                        ygc.ygc_default_stack.top()));
                 }
             }
 
@@ -395,7 +397,9 @@ json_path_handler_base::walk(
                         ensure(false);
                     }
                     child_root = this->jph_obj_provider(
-                        {{ypc.ypc_pcre_context, pi}, -1}, root);
+                        {{ypc.ypc_pcre_context, pi},
+                         yajlpp_provider_context::nindex},
+                        root);
                 }
 
                 jph.walk(cb, child_root, full_path);
@@ -431,7 +435,7 @@ const char*
 json_path_handler_base::to_enum_string(int value) const
 {
     for (int lpc = 0; this->jph_enum_values[lpc].first; lpc++) {
-        const enum_value_t& ev = this->jph_enum_values[lpc];
+        const auto& ev = this->jph_enum_values[lpc];
 
         if (ev.second == value) {
             return ev.first;
@@ -584,7 +588,7 @@ yajlpp_parse_context::update_callbacks(const json_path_container* orig_handlers,
         }
     }
 
-    for (auto& jph : handlers->jpc_children) {
+    for (const auto& jph : handlers->jpc_children) {
         pi.reset(&this->ypc_path[1 + child_start],
                  0,
                  this->ypc_path.size() - 2 - child_start);
@@ -592,11 +596,12 @@ yajlpp_parse_context::update_callbacks(const json_path_container* orig_handlers,
             pcre_context::capture_t* cap = this->ypc_pcre_context.all();
 
             if (jph.jph_obj_provider) {
-                int index = this->index_for_provider();
+                auto index = this->index_for_provider();
 
                 if ((1 + child_start + cap->c_end
                      != (int) this->ypc_path.size() - 1)
-                    && (!jph.is_array() || index >= 0))
+                    && (!jph.is_array()
+                        || index != yajlpp_provider_context::nindex))
                 {
                     this->ypc_obj_stack.push(jph.jph_obj_provider(
                         {{this->ypc_pcre_context, pi}, index},
diff --git a/src/yajlpp/yajlpp.hh b/src/yajlpp/yajlpp.hh
index 12242d3d..710e35ab 100644
--- a/src/yajlpp/yajlpp.hh
+++ b/src/yajlpp/yajlpp.hh
@@ -89,7 +89,9 @@ class yajlpp_parse_context;
 
 struct yajlpp_provider_context {
     pcre_extractor ypc_extractor;
-    int ypc_index;
+    size_t ypc_index{0};
+
+    static constexpr size_t nindex = static_cast<size_t>(-1);
 
     template<typename T>
     intern_string_t get_substr_i(T name) const
@@ -149,7 +151,7 @@ struct json_path_handler_base {
         }
 
         const char* first;
-        unsigned int second;
+        int second;
     };
 
     static const enum_value_t ENUM_TERMINATOR;
@@ -400,7 +402,7 @@ public:
     yajl_callbacks ypc_alt_callbacks;
     std::vector<char> ypc_path;
     std::vector<size_t> ypc_path_index_stack;
-    std::vector<int> ypc_array_index;
+    std::vector<size_t> ypc_array_index;
     std::vector<const json_path_handler_base*> ypc_handler_stack;
     pcre_context_static<30> ypc_pcre_context;
     bool ypc_ignore_unused{false};
@@ -416,11 +418,11 @@ public:
 private:
     static const yajl_callbacks DEFAULT_CALLBACKS;
 
-    int index_for_provider() const
+    size_t index_for_provider() const
     {
-        return this->ypc_array_index.empty() ? -1
+        return this->ypc_array_index.empty() ? static_cast<size_t>(-1)
                                              : this->ypc_array_index.back();
-    };
+    }
 
     static int map_start(void* ctx);
     static int map_key(void* ctx, const unsigned char* key, size_t len);