diff --git a/chapters/2.theoretical-background/2.1.hash-functions.tex b/chapters/2.theoretical-background/2.1.hash-functions.tex
index a548738..b82e5e1 100644
--- a/chapters/2.theoretical-background/2.1.hash-functions.tex
+++ b/chapters/2.theoretical-background/2.1.hash-functions.tex
@@ -4,7 +4,7 @@
 
 \begin{figure}[H]
 	\centering
-	\includegraphics[width=.9\textwidth]{assets/figures/chapter-2/2.1.hash-functions-1.png}
+	\includegraphics[width=.9\textwidth]{assets/figures/chapter-2/2.1.hash-functions-1}
 	\caption{Λειτουργία συνάρτησης κατακερματισμού}
 \end{figure}
 
@@ -19,7 +19,7 @@
 
 \begin{figure}[H]
 	\centering
-	\includegraphics[width=.9\textwidth]{assets/figures/chapter-2/2.1.hash-functions-2.png}
+	\includegraphics[width=.9\textwidth]{assets/figures/chapter-2/2.1.hash-functions-2}
 	\caption{Παράδειγμα λειτουργίας συνάρτησης κατακερματισμού}
 \end{figure}
 
diff --git a/chapters/2.theoretical-background/2.2.asymmetric-cryptography.tex b/chapters/2.theoretical-background/2.2.asymmetric-cryptography.tex
index 61cd84d..207213e 100644
--- a/chapters/2.theoretical-background/2.2.asymmetric-cryptography.tex
+++ b/chapters/2.theoretical-background/2.2.asymmetric-cryptography.tex
@@ -11,7 +11,7 @@
 
 \begin{figure}[H]
 	\centering
-	\includegraphics[width=.95\textwidth]{assets/figures/chapter-2/2.2.asymmetric-key-generation.png}
+	\includegraphics[width=.95\textwidth]{assets/figures/chapter-2/2.2.asymmetric-key-generation}
 	\caption{Παραγωγή ασύμμετρου ζεύγους κλειδιών}
 \end{figure}
 
@@ -30,7 +30,7 @@
 
 \begin{figure}[H]
 	\centering
-	\includegraphics[width=.95\textwidth]{assets/figures/chapter-2/2.2.asymmetric-end-to-end-communication.png}
+	\includegraphics[width=.95\textwidth]{assets/figures/chapter-2/2.2.asymmetric-end-to-end-communication}
 	\caption{Κρυπτογράφηση απ' άκρη σ' άκρη}
 \end{figure}
 
diff --git a/chapters/2.theoretical-background/2.3.merkle-trees.tex b/chapters/2.theoretical-background/2.3.merkle-trees.tex
index 4c41784..a726788 100644
--- a/chapters/2.theoretical-background/2.3.merkle-trees.tex
+++ b/chapters/2.theoretical-background/2.3.merkle-trees.tex
@@ -6,7 +6,7 @@
 
 \begin{figure}[H]
 	\centering
-	\includegraphics[width=.85\textwidth]{assets/figures/chapter-2/2.3.merkle-tree.png}
+	\includegraphics[width=.85\textwidth]{assets/figures/chapter-2/2.3.merkle-tree}
 	\caption{Παράδειγμα δυαδικού δένδρου Merkle}
 \end{figure}
 
diff --git a/chapters/2.theoretical-background/2.7.ipfs.tex b/chapters/2.theoretical-background/2.7.ipfs.tex
index 79c88bf..d532e3d 100644
--- a/chapters/2.theoretical-background/2.7.ipfs.tex
+++ b/chapters/2.theoretical-background/2.7.ipfs.tex
@@ -13,7 +13,7 @@
 
 	\vspace{-\baselineskip}
 	\begin{enumitemcenteredfigure}
-		\includegraphics[width=\textwidth]{assets/figures/chapter-2/2.7.merkle-dag.png}
+		\includegraphics[width=\textwidth]{assets/figures/chapter-2/2.7.merkle-dag}
 		\caption[Παράδειγμα Merkle DAG]{Παράδειγμα Merkle DAG\footnotemark}
 	\end{enumitemcenteredfigure}
 	\vspace{-\baselineskip}
diff --git a/chapters/3.application-design/3.8.implementation-methodology-specification.tex b/chapters/3.application-design/3.8.implementation-methodology-specification.tex
index 9f32992..9af1d2e 100644
--- a/chapters/3.application-design/3.8.implementation-methodology-specification.tex
+++ b/chapters/3.application-design/3.8.implementation-methodology-specification.tex
@@ -21,7 +21,7 @@
 
 \begin{figure}[H]
     \centering
-    \includegraphics[width=\textwidth]{assets/figures/chapter-3/3.8.implementation-methodology-specification-sprints.png}
+    \includegraphics[width=\textwidth]{assets/figures/chapter-3/3.8.implementation-methodology-specification-sprints}
     \caption{Διαχωρισμός σε Sprint (στάδιο σχεδίασης)}
     \label{figure:3.8.implementation-methodology-specification-sprints}
 \end{figure}
diff --git a/chapters/4.application-implementation/4.1.implementation-methodology.tex b/chapters/4.application-implementation/4.1.implementation-methodology.tex
index 31fc44b..0b99ef4 100644
--- a/chapters/4.application-implementation/4.1.implementation-methodology.tex
+++ b/chapters/4.application-implementation/4.1.implementation-methodology.tex
@@ -28,7 +28,7 @@
 
 \begin{figure}[H]
     \centering
-    \includegraphics[width=\textwidth]{assets/figures/chapter-4/4.1.implementation-methodology-kanban.png}
+    \includegraphics[width=\textwidth]{assets/figures/chapter-4/4.1.implementation-methodology-kanban}
     \caption{Στιγμιότυπο οθόνης της διαδικτυακής υπηρεσίας Trello}
     \label{figure:4.1.implementation-methodology-kanban}
 \end{figure}
diff --git a/chapters/4.application-implementation/4.3.implementation-architecture.tex b/chapters/4.application-implementation/4.3.implementation-architecture.tex
index 4e4c717..2137492 100644
--- a/chapters/4.application-implementation/4.3.implementation-architecture.tex
+++ b/chapters/4.application-implementation/4.3.implementation-architecture.tex
@@ -51,7 +51,7 @@
 
 \begin{figure}[H]
     \centering
-    \includegraphics[width=\textwidth]{assets/figures/chapter-4/4.3.architecture-architecture-overview.png}
+    \includegraphics[width=\textwidth]{assets/figures/chapter-4/4.3.architecture-architecture-overview}
     \caption{Διάγραμμα αρχιτεκτονικής συστήματος}
     \label{figure:4-3-architecture-overview}
 \end{figure}
diff --git a/chapters/4.application-implementation/4.3.implementation-architecture/4.3.2.concordia-application-service.tex b/chapters/4.application-implementation/4.3.implementation-architecture/4.3.2.concordia-application-service.tex
index ef4d3ce..f069d77 100644
--- a/chapters/4.application-implementation/4.3.implementation-architecture/4.3.2.concordia-application-service.tex
+++ b/chapters/4.application-implementation/4.3.implementation-architecture/4.3.2.concordia-application-service.tex
@@ -33,7 +33,7 @@
 
 \begin{figure}[H]
     \centering
-    \includegraphics[width=.9\textwidth]{assets/figures/chapter-4/4.3.architecture-4.3.2.concordia-application-architecture.png}
+    \includegraphics[width=.9\textwidth]{assets/figures/chapter-4/4.3.architecture-4.3.2.concordia-application-architecture}
     \caption{Αρχιτεκτονική υπηρεσίας Concordia Application}
     \label{figure:4-3-concordia-application-architecture}
 \end{figure}
diff --git a/chapters/4.application-implementation/4.3.implementation-architecture/4.3.3.concordia-contracts-migrator.tex b/chapters/4.application-implementation/4.3.implementation-architecture/4.3.3.concordia-contracts-migrator.tex
index 96b2c1a..3791f68 100644
--- a/chapters/4.application-implementation/4.3.implementation-architecture/4.3.3.concordia-contracts-migrator.tex
+++ b/chapters/4.application-implementation/4.3.implementation-architecture/4.3.3.concordia-contracts-migrator.tex
@@ -8,7 +8,7 @@
 
 \begin{figure}[H]
     \centering
-    \includegraphics[width=.75\textwidth]{assets/figures/chapter-4/4.3.architecture-4.3.3.concordia-contracts-migrator-architecture.png}
+    \includegraphics[width=.75\textwidth]{assets/figures/chapter-4/4.3.architecture-4.3.3.concordia-contracts-migrator-architecture}
     \caption{Αρχιτεκτονική υπηρεσίας Concordia Contracts Migrator}
     \label{figure:4-3-concordia-contracts-migrator-architecture}
 \end{figure}
diff --git a/chapters/4.application-implementation/4.3.implementation-architecture/4.3.4.concordia-pinner-service.tex b/chapters/4.application-implementation/4.3.implementation-architecture/4.3.4.concordia-pinner-service.tex
index df0ed8f..984de5b 100644
--- a/chapters/4.application-implementation/4.3.implementation-architecture/4.3.4.concordia-pinner-service.tex
+++ b/chapters/4.application-implementation/4.3.implementation-architecture/4.3.4.concordia-pinner-service.tex
@@ -8,7 +8,7 @@
 
 \begin{figure}[H]
     \centering
-    \includegraphics[width=.75\textwidth]{assets/figures/chapter-4/4.3.architecture-4.3.4.concordia-pinner-architecture.png}
+    \includegraphics[width=.75\textwidth]{assets/figures/chapter-4/4.3.architecture-4.3.4.concordia-pinner-architecture}
     \caption{Αρχιτεκτονική υπηρεσίας Concordia Pinner}
     \label{figure:4-3-concordia-pinner-architecture}
 \end{figure}
diff --git a/chapters/4.application-implementation/4.3.implementation-architecture/4.3.8.service-communication.tex b/chapters/4.application-implementation/4.3.implementation-architecture/4.3.8.service-communication.tex
index 589ccf8..a72d7f8 100644
--- a/chapters/4.application-implementation/4.3.implementation-architecture/4.3.8.service-communication.tex
+++ b/chapters/4.application-implementation/4.3.implementation-architecture/4.3.8.service-communication.tex
@@ -6,7 +6,7 @@
 
 \begin{figure}[H]
     \centering
-    \includegraphics[width=\textwidth]{assets/figures/chapter-4/4.3.communications-diagram.png}
+    \includegraphics[width=\textwidth]{assets/figures/chapter-4/4.3.communications-diagram}
     \caption{Γράφος οπτικοποίησης των καναλιών επικοινωνίας των μικροϋπηρεσιών}
     \label{figure:4-3-communications-graph}
 \end{figure}
diff --git a/chapters/4.application-implementation/4.5.implemented-parts.tex b/chapters/4.application-implementation/4.5.implemented-parts.tex
index 4848ca4..1acf32e 100644
--- a/chapters/4.application-implementation/4.5.implemented-parts.tex
+++ b/chapters/4.application-implementation/4.5.implemented-parts.tex
@@ -41,7 +41,7 @@
 
 \begin{figure}[H]
     \centering
-    \includegraphics[width=\textwidth]{assets/figures/chapter-4/4.6.design-implementation-differences-sprints.png}
+    \includegraphics[width=\textwidth]{assets/figures/chapter-4/4.6.design-implementation-differences-sprints}
     \caption{Διαχωρισμός σε Sprint (στάδιο υλοποίησης)}
     \label{figure:4.5.design-implementation-differences-sprints}
 \end{figure}
diff --git a/misc/title-page.tex b/misc/title-page.tex
index 20713d8..48ad32c 100644
--- a/misc/title-page.tex
+++ b/misc/title-page.tex
@@ -1,4 +1,4 @@
-\universityLogo{assets/figures/auth-logo.png}
+\universityLogo{assets/figures/auth-logo}
 
 \title{Αυτόνομο κοινωνικό δίκτυο βασισμένο σε τεχνολογίες αποκέντρωσης}
 
diff --git a/thesis.pdf b/thesis.pdf
index ae7d5c2..da100bd 100644
Binary files a/thesis.pdf and b/thesis.pdf differ