diff --git a/common/boot_control_stub.h b/common/boot_control_stub.h
index 7832adc..9e3b05c 100644
--- a/common/boot_control_stub.h
+++ b/common/boot_control_stub.h
@@ -27,7 +27,7 @@
 // typically used when e.g. an underlying HAL implementation cannot be
 // loaded or doesn't exist.
 //
-// You are gauranteed that the implementation of GetNumSlots() method
+// You are guaranteed that the implementation of GetNumSlots() method
 // always returns 0. This can be used to identify that this
 // implementation is in use.
 class BootControlStub : public BootControlInterface {
diff --git a/common/error_code.h b/common/error_code.h
index ce41d19..c7e4967 100644
--- a/common/error_code.h
+++ b/common/error_code.h
@@ -116,7 +116,7 @@
   // modify the implementation of ErrorCode into a properly encapsulated class.
   kDevModeFlag = 1 << 31,
 
-  // Set if resuming an interruped update.
+  // Set if resuming an interrupted update.
   kResumedFlag = 1 << 30,
 
   // Set if using a dev/test image as opposed to an MP-signed image.
diff --git a/common/utils.cc b/common/utils.cc
index f651823..d935535 100644
--- a/common/utils.cc
+++ b/common/utils.cc
@@ -291,7 +291,10 @@
   return true;
 }
 
-bool PReadAll(const FileDescriptorPtr& fd, void* buf, size_t count, off_t offset,
+bool PReadAll(const FileDescriptorPtr& fd,
+              void* buf,
+              size_t count,
+              off_t offset,
               ssize_t* out_bytes_read) {
   TEST_AND_RETURN_FALSE_ERRNO(fd->Seek(offset, SEEK_SET) !=
                               static_cast<off_t>(-1));
@@ -774,7 +777,7 @@
   if (size < offsetof(Elf32_Ehdr, e_machine) + sizeof(hdr->e_machine))
     return true;
   uint16_t e_machine;
-  // Fix endianess regardless of the host endianess.
+  // Fix endianness regardless of the host endianness.
   if (ei_data == ELFDATA2LSB)
     e_machine = le16toh(hdr->e_machine);
   else
diff --git a/common/utils.h b/common/utils.h
index c102a16..5c44083 100644
--- a/common/utils.h
+++ b/common/utils.h
@@ -110,7 +110,7 @@
 // occurs, -1 is returned.
 off_t BlockDevSize(int fd);
 
-// Returns the size of the file at path, or the file desciptor fd. If the file
+// Returns the size of the file at path, or the file descriptor fd. If the file
 // is actually a block device, this function will automatically call
 // BlockDevSize. If the file doesn't exist or some error occurrs, -1 is
 // returned.
diff --git a/daemon_state_android.cc b/daemon_state_android.cc
index 0960b1a..c9c09b8 100644
--- a/daemon_state_android.cc
+++ b/daemon_state_android.cc
@@ -36,7 +36,7 @@
 
   hardware_ = hardware::CreateHardware();
   if (!hardware_) {
-    LOG(ERROR) << "Error intializing the HardwareInterface.";
+    LOG(ERROR) << "Error initializing the HardwareInterface.";
     return false;
   }
 
diff --git a/omaha_request_action.cc b/omaha_request_action.cc
index 6354641..78d8d50 100644
--- a/omaha_request_action.cc
+++ b/omaha_request_action.cc
@@ -180,7 +180,7 @@
                        const string arg_name,
                        const string prefs_key) {
   // There's nothing wrong with not having a given cohort setting, so we check
-  // existance first to avoid the warning log message.
+  // existence first to avoid the warning log message.
   if (!prefs->Exists(prefs_key))
     return "";
   string cohort_value;
diff --git a/p2p_manager_unittest.cc b/p2p_manager_unittest.cc
index 5ffb358..01bdc35 100644
--- a/p2p_manager_unittest.cc
+++ b/p2p_manager_unittest.cc
@@ -183,7 +183,7 @@
 }
 
 // Check that we keep files with the .$EXT.p2p extension not older
-// than some specificed age (5 days, in this test).
+// than some specific age (5 days, in this test).
 TEST_F(P2PManagerTest, HousekeepingAgeLimit) {
   // We set the cutoff time to be 1 billion seconds (01:46:40 UTC on 9
   // September 2001 - arbitrary number, but constant to avoid test
diff --git a/payload_consumer/cached_file_descriptor_unittest.cc b/payload_consumer/cached_file_descriptor_unittest.cc
index 6a6302a..d2965fc 100644
--- a/payload_consumer/cached_file_descriptor_unittest.cc
+++ b/payload_consumer/cached_file_descriptor_unittest.cc
@@ -159,7 +159,7 @@
   off64_t seek = 10;
   brillo::Blob blob_in(kFileSize, 0);
   std::fill_n(&blob_in[seek], kCacheSize, value_);
-  // We are writing exactly one cache size; Then it should be commited.
+  // We are writing exactly one cache size; Then it should be committed.
   EXPECT_EQ(cfd_->Seek(seek, SEEK_SET), seek);
   Write(&blob_in[seek], kCacheSize);
 
@@ -174,7 +174,7 @@
   EXPECT_EQ(cfd_->Seek(seek, SEEK_SET), seek);
   brillo::Blob blob_in(kFileSize, 0);
   std::fill_n(&blob_in[seek], less_than_cache_size, value_);
-  // We are writing less than one cache size; then it should not be commited.
+  // We are writing less than one cache size; then it should not be committed.
   Write(&blob_in[seek], less_than_cache_size);
 
   // Revert the changes in |blob_in|.
@@ -190,7 +190,7 @@
   EXPECT_EQ(cfd_->Seek(seek, SEEK_SET), seek);
   brillo::Blob blob_in(kFileSize, 0);
   std::fill_n(&blob_in[seek], less_than_cache_size, value_);
-  // We are writing less than  one cache size; then it should not be commited.
+  // We are writing less than  one cache size; then it should not be committed.
   Write(&blob_in[seek], less_than_cache_size);
 
   // Then we seek, it should've written the cache after seek.
diff --git a/payload_consumer/file_descriptor_utils.h b/payload_consumer/file_descriptor_utils.h
index 397c35e..68fb001 100644
--- a/payload_consumer/file_descriptor_utils.h
+++ b/payload_consumer/file_descriptor_utils.h
@@ -42,7 +42,7 @@
     uint64_t block_size,
     brillo::Blob* hash_out);
 
-// Reads blocks from |source| and caculates the hash. The blocks to read are
+// Reads blocks from |source| and calculates the hash. The blocks to read are
 // specified by |extents|. Stores the hash in |hash_out| if it is not null. The
 // block sizes are passed as |block_size|. In case of error reading, it returns
 // false and the value pointed by |hash_out| is undefined.
diff --git a/payload_generator/extent_ranges_unittest.cc b/payload_generator/extent_ranges_unittest.cc
index 3705bac..d9dd467 100644
--- a/payload_generator/extent_ranges_unittest.cc
+++ b/payload_generator/extent_ranges_unittest.cc
@@ -304,7 +304,7 @@
 }
 
 TEST(ExtentRangesTest, FilterExtentRangesMultipleRanges) {
-  // Two overlaping extents, with three ranges to remove.
+  // Two overlapping extents, with three ranges to remove.
   vector<Extent> extents {
       ExtentForRange(10, 100),
       ExtentForRange(30, 100) };
diff --git a/payload_generator/filesystem_interface.h b/payload_generator/filesystem_interface.h
index b1506e4..08dfd19 100644
--- a/payload_generator/filesystem_interface.h
+++ b/payload_generator/filesystem_interface.h
@@ -19,9 +19,9 @@
 
 // This class is used to abstract a filesystem and iterate the blocks
 // associated with the files and filesystem structures.
-// For the purposes of the update payload generation, a filesystem is a formated
-// partition composed by fixed-size blocks, since that's the interface used in
-// the update payload.
+// For the purposes of the update payload generation, a filesystem is a
+// formatted partition composed by fixed-size blocks, since that's the interface
+// used in the update payload.
 
 #include <sys/stat.h>
 #include <sys/types.h>
diff --git a/payload_generator/payload_generation_config.h b/payload_generator/payload_generation_config.h
index ca6fb04..d64bf35 100644
--- a/payload_generator/payload_generation_config.h
+++ b/payload_generator/payload_generation_config.h
@@ -154,7 +154,7 @@
   // if is_full is false, so we are requested a delta payload.
   ImageConfig source;
 
-  // Wheter the requested payload is a delta payload.
+  // Whether the requested payload is a delta payload.
   bool is_delta = false;
 
   // The major/minor version of the payload.
diff --git a/payload_state.h b/payload_state.h
index d1906c2..17c1ce0 100644
--- a/payload_state.h
+++ b/payload_state.h
@@ -337,7 +337,7 @@
 
   // Loads the number of bytes that have been currently downloaded through the
   // previous attempts from the persisted state for the given source. It's
-  // reset to 0 everytime we begin a full update and is continued from previous
+  // reset to 0 every time we begin a full update and is continued from previous
   // attempt if we're resuming the update.
   void LoadCurrentBytesDownloaded(DownloadSource source);
 
@@ -349,7 +349,7 @@
 
   // Loads the total number of bytes that have been downloaded (since the last
   // successful update) from the persisted state for the given source. It's
-  // reset to 0 everytime we successfully apply an update and counts the bytes
+  // reset to 0 every time we successfully apply an update and counts the bytes
   // downloaded for both successful and failed attempts since then.
   void LoadTotalBytesDownloaded(DownloadSource source);
 
@@ -485,7 +485,7 @@
   int32_t url_switch_count_;
 
   // The current download source based on the current URL. This value is
-  // not persisted as it can be recomputed everytime we update the URL.
+  // not persisted as it can be recomputed every time we update the URL.
   // We're storing this so as not to recompute this on every few bytes of
   // data we read from the socket.
   DownloadSource current_download_source_;
diff --git a/real_system_state.cc b/real_system_state.cc
index 8e7ad51..0ce326b 100644
--- a/real_system_state.cc
+++ b/real_system_state.cc
@@ -62,7 +62,7 @@
 
   hardware_ = hardware::CreateHardware();
   if (!hardware_) {
-    LOG(ERROR) << "Error intializing the HardwareInterface.";
+    LOG(ERROR) << "Error initializing the HardwareInterface.";
     return false;
   }
 
@@ -76,13 +76,13 @@
 
   connection_manager_ = connection_manager::CreateConnectionManager(this);
   if (!connection_manager_) {
-    LOG(ERROR) << "Error intializing the ConnectionManagerInterface.";
+    LOG(ERROR) << "Error initializing the ConnectionManagerInterface.";
     return false;
   }
 
   power_manager_ = power_manager::CreatePowerManager();
   if (!power_manager_) {
-    LOG(ERROR) << "Error intializing the PowerManagerInterface.";
+    LOG(ERROR) << "Error initializing the PowerManagerInterface.";
     return false;
   }
 
diff --git a/scripts/update_payload/checker.py b/scripts/update_payload/checker.py
index e241b0b..e9e9958 100644
--- a/scripts/update_payload/checker.py
+++ b/scripts/update_payload/checker.py
@@ -336,7 +336,7 @@
     self.new_kernel_fs_size = 0
     self.minor_version = None
     # TODO(*): When fixing crbug.com/794404, the major version should be
-    # correclty handled in update_payload scripts. So stop forcing
+    # correctly handled in update_payload scripts. So stop forcing
     # major_verions=1 here and set it to the correct value.
     self.major_version = 1
 
@@ -742,7 +742,7 @@
                                            self.block_size,
                                            op_name + '.data_length', 'dst')
     else:
-      # Check: data_length must be smaller than the alotted dst blocks.
+      # Check: data_length must be smaller than the allotted dst blocks.
       if data_length >= total_dst_blocks * self.block_size:
         raise error.PayloadError(
             '%s: data_length (%d) must be less than allotted dst block '
@@ -867,7 +867,7 @@
     if data_length is None:
       raise error.PayloadError('%s: missing data_{offset,length}.' % op_name)
 
-    # Check: data_length is strictly smaller than the alotted dst blocks.
+    # Check: data_length is strictly smaller than the allotted dst blocks.
     if data_length >= total_dst_blocks * self.block_size:
       raise error.PayloadError(
           '%s: data_length (%d) must be smaller than allotted dst space '
diff --git a/update_attempter.cc b/update_attempter.cc
index c26a661..a1cec07 100644
--- a/update_attempter.cc
+++ b/update_attempter.cc
@@ -1421,7 +1421,7 @@
 
     // Write out the new value of update_check_count_value.
     if (prefs_->SetInt64(kPrefsUpdateCheckCount, update_check_count_value)) {
-      // We successfully wrote out te new value, so enable the
+      // We successfully wrote out the new value, so enable the
       // update check based wait.
       LOG(INFO) << "New update check count = " << update_check_count_value;
       return true;
diff --git a/update_attempter.h b/update_attempter.h
index 41b7f8e..2ec6174 100644
--- a/update_attempter.h
+++ b/update_attempter.h
@@ -160,7 +160,7 @@
   BootControlInterface::Slot GetRollbackSlot() const;
 
   // Initiates a reboot if the current state is
-  // UPDATED_NEED_REBOOT. Returns true on sucess, false otherwise.
+  // UPDATED_NEED_REBOOT. Returns true on success, false otherwise.
   bool RebootIfNeeded();
 
   // DownloadActionDelegate methods:
@@ -198,7 +198,7 @@
   virtual bool GetBootTimeAtUpdate(base::Time *out_boot_time);
 
   // Returns a version OS version that was being used before the last reboot,
-  // and if that reboot happended to be into an update (current version).
+  // and if that reboot happened to be into an update (current version).
   // This will return an empty string otherwise.
   std::string const& GetPrevVersion() const { return prev_version_; }
 
@@ -332,7 +332,7 @@
 
   // Helper method of Update() to calculate the update-related parameters
   // from various sources and set the appropriate state. Please refer to
-  // Update() method for the meaning of the parametes.
+  // Update() method for the meaning of the parameters.
   bool CalculateUpdateParams(const std::string& app_version,
                              const std::string& omaha_url,
                              const std::string& target_channel,
diff --git a/update_attempter_android_unittest.cc b/update_attempter_android_unittest.cc
index 94452df..7d0daec 100644
--- a/update_attempter_android_unittest.cc
+++ b/update_attempter_android_unittest.cc
@@ -184,7 +184,7 @@
                   _))
       .Times(1);
 
-  // The first update fails after receving 50 bytes in total.
+  // The first update fails after receiving 50 bytes in total.
   update_attempter_android_.BytesReceived(30, 50, 200);
   update_attempter_android_.ProcessingDone(nullptr, ErrorCode::kError);
   EXPECT_EQ(
diff --git a/update_engine_client.cc b/update_engine_client.cc
index bb19632..94253de 100644
--- a/update_engine_client.cc
+++ b/update_engine_client.cc
@@ -396,7 +396,7 @@
     string rollback_partition;
 
     if (!client_->GetRollbackPartition(&rollback_partition)) {
-      LOG(ERROR) << "Error while querying rollback partition availabilty.";
+      LOG(ERROR) << "Error while querying rollback partition availability.";
       return 1;
     }
 
diff --git a/update_manager/evaluation_context.h b/update_manager/evaluation_context.h
index df5816a..0bdbaec 100644
--- a/update_manager/evaluation_context.h
+++ b/update_manager/evaluation_context.h
@@ -114,7 +114,7 @@
   // there's no cached variable, this method returns false.
   //
   // Right before the passed closure is called the EvaluationContext is
-  // reseted, removing all the non-const cached values.
+  // reset, removing all the non-const cached values.
   bool RunOnValueChangeOrTimeout(base::Closure callback);
 
   // Returns a textual representation of the evaluation context,
diff --git a/update_manager/policy.h b/update_manager/policy.h
index b60c4da..05bb2ad 100644
--- a/update_manager/policy.h
+++ b/update_manager/policy.h
@@ -118,7 +118,7 @@
 
   // Information pertaining to update scattering.
   //
-  // The currently knwon (persisted) scattering wallclock-based wait period and
+  // The currently known (persisted) scattering wallclock-based wait period and
   // update check threshold; zero if none.
   base::TimeDelta scatter_wait_period;
   int scatter_check_threshold;
diff --git a/update_metadata.proto b/update_metadata.proto
index 7ff032a..fe81efb 100644
--- a/update_metadata.proto
+++ b/update_metadata.proto
@@ -82,7 +82,7 @@
 //   the new partition.
 //
 // The operations allowed in the payload (supported by the client) depend on the
-// major and minor version. See InstallOperation.Type bellow for details.
+// major and minor version. See InstallOperation.Type below for details.
 
 syntax = "proto2";