diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/keyimport/HkpKeyserver.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/keyimport/HkpKeyserver.java
index a5b49c04e..e97ff59e8 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/keyimport/HkpKeyserver.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/keyimport/HkpKeyserver.java
@@ -232,7 +232,7 @@ public class HkpKeyserver extends Keyserver {
                 throw new HttpError(response.code(), responseBody);
             }
         } catch (IOException e) {
-            e.printStackTrace();
+            Log.e(Constants.TAG, "IOException at HkpKeyserver", e);
             throw new QueryFailedException("Keyserver '" + mHost + "' is unavailable. Check your Internet connection!" +
             proxy == null?"":" Using proxy " + proxy);
         }
@@ -351,12 +351,12 @@ public class HkpKeyserver extends Keyserver {
     @Override
     public String get(String keyIdHex, Proxy proxy) throws QueryFailedException {
         String request = "/pks/lookup?op=get&options=mr&search=" + keyIdHex;
-        Log.d(Constants.TAG, "hkp keyserver get: " + request);
+        Log.d(Constants.TAG, "hkp keyserver get: " + request + " using Proxy: " + proxy);
         String data;
         try {
             data = query(request, proxy);
         } catch (HttpError httpError) {
-            httpError.printStackTrace();
+            Log.e(Constants.TAG, "Failed to get key at HkpKeyserver", httpError);
             throw new QueryFailedException("not found");
         }
         Matcher matcher = PgpHelper.PGP_PUBLIC_KEY.matcher(data);
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/SignEncryptOperation.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/SignEncryptOperation.java
index 7c58d62f8..09ffcf4cb 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/SignEncryptOperation.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/operations/SignEncryptOperation.java
@@ -37,6 +37,7 @@ import org.sufficientlysecure.keychain.service.input.RequiredInputParcel.NfcSign
 import org.sufficientlysecure.keychain.service.input.RequiredInputParcel.RequiredInputType;
 import org.sufficientlysecure.keychain.util.FileHelper;
 import org.sufficientlysecure.keychain.util.InputData;
+import org.sufficientlysecure.keychain.util.Log;
 import org.sufficientlysecure.keychain.util.ProgressScaler;
 
 import java.io.ByteArrayInputStream;
@@ -85,7 +86,7 @@ public class SignEncryptOperation extends BaseOperation<SignEncryptParcel> {
                         input.getSignatureMasterKeyId()).getSecretSignId();
                 input.setSignatureSubKeyId(signKeyId);
             } catch (PgpKeyNotFoundException e) {
-                e.printStackTrace();
+                Log.e(Constants.TAG, "Key not found", e);
                 return new SignEncryptResult(SignEncryptResult.RESULT_ERROR, log, results);
             }
         }
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerify.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerify.java
index fd3d41f93..3657fa4a0 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerify.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/PgpDecryptVerify.java
@@ -98,7 +98,7 @@ public class PgpDecryptVerify extends BaseOperation<PgpDecryptVerifyInputParcel>
                 long inputSize = FileHelper.getFileSize(mContext, input.getInputUri(), 0);
                 inputData = new InputData(inputStream, inputSize);
             } catch (FileNotFoundException e) {
-                e.printStackTrace();
+                Log.e(Constants.TAG, "File not found at " + input.getInputUri(), e);
                 return null;
             }
         }
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/PassphraseWizardActivity.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/PassphraseWizardActivity.java
index 2e838535d..ed96156fe 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/PassphraseWizardActivity.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/PassphraseWizardActivity.java
@@ -43,7 +43,9 @@ import android.widget.EditText;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import org.sufficientlysecure.keychain.Constants;
 import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.util.Log;
 
 import java.io.IOException;
 import java.io.UnsupportedEncodingException;
@@ -207,7 +209,7 @@ public class PassphraseWizardActivity extends FragmentActivity {
 //                        transaction.replace(R.id.fragmentContainer, lpf).addToBackStack(null).commit();
                     }
                 } catch (IOException | FormatException e) {
-                    e.printStackTrace();
+                    Log.e(Constants.TAG, "Failed to write on NFC tag", e);
                 }
 
             } else if (readNFC && AUTHENTICATION.equals(selectedAction)) {
@@ -232,7 +234,7 @@ public class PassphraseWizardActivity extends FragmentActivity {
                         }
                     }
                 } catch (IOException | FormatException e) {
-                    e.printStackTrace();
+                    Log.e(Constants.TAG, "Failed to read NFC tag", e);
                 }
             }
         }
@@ -263,7 +265,7 @@ public class PassphraseWizardActivity extends FragmentActivity {
                 try {
                     password = readText(ndefRecord);
                 } catch (UnsupportedEncodingException e) {
-                    e.printStackTrace();
+                    Log.e(Constants.TAG, "Failed to read password from tag", e);
                 }
             }
         }
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/PasswordStrengthView.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/PasswordStrengthView.java
index 1487c3053..6f5947866 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/PasswordStrengthView.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/ui/widget/PasswordStrengthView.java
@@ -31,7 +31,9 @@ import android.graphics.Paint;
 import android.util.AttributeSet;
 import android.view.View;
 
+import org.sufficientlysecure.keychain.Constants;
 import org.sufficientlysecure.keychain.R;
+import org.sufficientlysecure.keychain.util.Log;
 
 /**
  * Created by Matt Allen
@@ -115,7 +117,7 @@ public class PasswordStrengthView extends View {
             mColorStrong = style.getColor(R.styleable.PasswordStrengthView_color_strong,
                     COLOR_STRONG);
         } catch (Exception e) {
-            e.printStackTrace();
+            Log.e(Constants.TAG, "Failed to retrieve attribute values for PasswordStrengthView", e);
         }
         // Create and style the paint used for drawing the guide on the indicator
         mGuidePaint = new Paint(Paint.ANTI_ALIAS_FLAG);