diff --git a/makefile b/makefile
index 76db542..c5f9387 100644
--- a/makefile
+++ b/makefile
@@ -1,36 +1,45 @@
-SRC = meu-trabalho
-SRC_COMP = meu-trabalho-compactado
-OUTPUT_DIR = latex.out
+SOURCE := meu-trabalho
+COMPRESSED_SUFFIX := compactado
+OUTPUT_DIR := latex.out
 
-TEX_FILES = $(shell find . -type f -iname "*.tex" -or -iname "*.cls" -or -iname "*.bib")
-IMG_FILES = $(shell find . -type f -iname "*.png" -or -iname "*.jpg" -or -iname "*.eps")
-PDF_FILES = $(shell find . -type f -iname "*.pdf" ! -iname "$(SRC).pdf" ! -iname "$(SRC_COMP).pdf")
-SVG_FILES = $(shell find . -type f -iname "*.svg")
+INPUT_TEX := $(SOURCE).tex
+OUTPUT_PDF := $(SOURCE).pdf
+OUTPUT_PDF_150_DPI := $(SOURCE)-$(COMPRESSED_SUFFIX)-150dpi.pdf
+OUTPUT_PDF_300_DPI := $(SOURCE)-$(COMPRESSED_SUFFIX)-300dpi.pdf
 
-.PHONY: default help compile compress clean
+TEX_FILES := $(shell find . -type f -iname "*.tex" -or -iname "*.cls" -or -iname "*.bib" ! -path "*/$(OUTPUT_DIR)/*")
+IMG_FILES := $(shell find . -type f -iname "*.png" -or -iname "*.jpg" -or -iname "*.eps" ! -path "*/$(OUTPUT_DIR)/*")
+PDF_FILES := $(shell find . -type f -iname "*.pdf" ! -path "*/$(OUTPUT_DIR)/*")
+SVG_FILES := $(shell find . -type f -iname "*.svg" ! -path "*/$(OUTPUT_DIR)/*")
+SVG_TO_PDF_FILES := $(SVG_FILES:.svg=.pdf)
+SOURCE_FILES := $(TEX_FILES) $(IMG_FILES) $(PDF_FILES) $(SVG_TO_PDF_FILES)
 
-default: compile
+# Define phony targets (not associated with file names)
+.PHONY: default help compile compress compress-max clean
 
+# Default target: compress PDF to 150 DPI
+default: compress-max
+
+# Display help information
 help:
 	@echo "Usage:"
-	@echo "  make           : Create the PDF document."
-	@echo "  make compress  : Create the compressed PDF document."
-	@echo "  make clean     : Remove generated files."
+	@echo "  make              : Create the PDF document."
+	@echo "  make compress-max : Create the compressed PDF document (150 DPI)."
+	@echo "  make compress     : Create the compressed PDF document (300 DPI)."
+	@echo "  make clean        : Remove generated files."
 	@echo ""
 
-compile: $(OUTPUT_DIR)/$(SRC).pdf
+# Compile the project
+compile: $(OUTPUT_DIR)/$(OUTPUT_PDF)
 
-$(OUTPUT_DIR)/$(SRC).pdf: $(TEX_FILES) $(IMG_FILES) $(PDF_FILES) $(SVG_FILES:.svg=.pdf)
+$(OUTPUT_DIR)/$(OUTPUT_PDF): $(SOURCE_FILES)
 	@echo "Building the project..."
 	@mkdir -p $(OUTPUT_DIR)
-	@latexmk \
-		-pdf \
-		-synctex=1 \
-		-output-directory=$(OUTPUT_DIR) $(SRC).tex
-	@touch $(OUTPUT_DIR)/$(SRC).pdf
+	@latexmk -pdf -synctex=1 -output-directory=$(OUTPUT_DIR) $(INPUT_TEX)
 	@echo "Done!"
 	@echo
 
+# Convert SVG files to PDF
 %.pdf: %.svg
 	@echo "Converting SVG to PDF..."
 	@echo " > File: '$<'..."
@@ -38,23 +47,31 @@ $(OUTPUT_DIR)/$(SRC).pdf: $(TEX_FILES) $(IMG_FILES) $(PDF_FILES) $(SVG_FILES:.sv
 	@echo "Done!"
 	@echo
 
-compress: $(OUTPUT_DIR)/$(SRC_COMP).pdf
+# Compress the PDF at 300 DPI
+compress: $(OUTPUT_DIR)/$(OUTPUT_PDF_300_DPI)
+
+$(OUTPUT_DIR)/$(OUTPUT_PDF_300_DPI): $(OUTPUT_DIR)/$(OUTPUT_PDF)
+	@echo "Compressing the document (300 DPI)..."
+	@gs -q -dNOPAUSE -dBATCH -dFastWebView -sDEVICE=pdfwrite \
+		-dPDFSETTINGS=/printer \
+		-sOutputFile=$(OUTPUT_DIR)/$(OUTPUT_PDF_300_DPI) \
+		$(OUTPUT_DIR)/$(OUTPUT_PDF)
+	@echo "Done!"
+	@echo
+
+# Compress the PDF at 150 DPI
+compress-max: $(OUTPUT_DIR)/$(OUTPUT_PDF_150_DPI)
 
-$(OUTPUT_DIR)/$(SRC_COMP).pdf: $(OUTPUT_DIR)/$(SRC).pdf
-	@echo "Compressing the document..."
-	@gs \
-		-q \
-		-dNOPAUSE \
-		-dBATCH \
-		-dFastWebView \
-		-sDEVICE=pdfwrite \
+$(OUTPUT_DIR)/$(OUTPUT_PDF_150_DPI): $(OUTPUT_DIR)/$(OUTPUT_PDF)
+	@echo "Compressing the document (150 DPI)..."
+	@gs -q -dNOPAUSE -dBATCH -dFastWebView -sDEVICE=pdfwrite \
 		-dPDFSETTINGS=/ebook \
-		-sOutputFile=$(OUTPUT_DIR)/$(SRC_COMP).pdf \
-		$(OUTPUT_DIR)/$(SRC).pdf
-	@touch $(OUTPUT_DIR)/$(SRC_COMP).pdf
+		-sOutputFile=$(OUTPUT_DIR)/$(OUTPUT_PDF_150_DPI) \
+		$(OUTPUT_DIR)/$(OUTPUT_PDF)
 	@echo "Done!"
 	@echo
 
+# Clean up all generated files
 clean:
 	@echo "Cleaning up generated files..."
 	@rm -rf $(OUTPUT_DIR)