diff --git a/bin/pdfcompress b/bin/pdfcompress
index d63e5f7..c7417e6 100755
--- a/bin/pdfcompress
+++ b/bin/pdfcompress
@@ -3,18 +3,18 @@
 set -euo pipefail
 
 function show_usage {
-	cat <<-END
-	usage: $0 [OPTIONS...] input_file output_file
+    cat <<-END
+    usage: $0 [OPTIONS...] input_file output_file
 
-	Converts a PDF file to a series of JPEG images using convert to
-	reduce the quality and then merges back the result in a single pdf 
+    Converts a PDF file to a series of JPEG images using convert to
+    reduce the quality and then merges back the result in a single pdf 
 
-	options:
-		-q, --quality    Set the JPEG quality (default: 75)
-		-v, --verbose    Enable verbose output
-		-h, --help       Display this help message
+    options:
+        -q, --quality    Set the JPEG quality (default: 75)
+        -v, --verbose    Enable verbose output
+        -h, --help       Display this help message
 END
-	exit 1
+    exit 1
 }
 
 quality=75
@@ -22,33 +22,33 @@ verbose=false
 
 while [[ $# -gt 0 ]]
 do
-	key="$1"
-
-	case $key in
-		-q|--quality)
-			quality="$2"
-			shift # past argument
-			shift # past value
-			;;
-		-v|--verbose)
-			verbose=true
-			shift # past argument
-			;;
-		-h|--help)
-			show_usage
-			;;
-		-*)
-			echo "Unknown option: $key"
-			show_usage
-			;;
-		*)
-			break
-			;;
-	esac
+    key="$1"
+
+    case $key in
+        -q|--quality)
+            quality="$2"
+            shift # past argument
+            shift # past value
+            ;;
+        -v|--verbose)
+            verbose=true
+            shift # past argument
+            ;;
+        -h|--help)
+            show_usage
+            ;;
+        -*)
+            echo "Unknown option: $key"
+            show_usage
+            ;;
+        *)
+            break
+            ;;
+    esac
 done
 
 if [ -z "$1" ] || [ -z "$2" ]; then
-	show_usage
+    show_usage
 fi
 
 input_file="$1"
@@ -57,9 +57,9 @@ output_file="$2"
 temp_pages_dir="$(mktemp -d)"
 
 function logf {
-	if [ "$verbose" = true ]; then
-		printf "$@"
-	fi
+    if [ "$verbose" = true ]; then
+        printf "$@"
+    fi
 }
 
 logf "Converting \"$input_file\" to \"$output_file\"\n"
@@ -70,18 +70,18 @@ logf "Processing $page_count pages\n"
 
 start=$(date +%s.%N)
 for i in $(seq 0 $((page_count-1))); do
-	iter_start=$(date +%s.%N)
+    iter_start=$(date +%s.%N)
 
-	convert -density 300 -quality "$quality" "${input_file}[$i]" "$temp_pages_dir/$i.jpg"
+    convert -density 300 -quality "$quality" "${input_file}[$i]" "$temp_pages_dir/$i.jpg"
 
-	# Compute estimated remaining time
-  end=$(date +%s.%N)
-  elapsed=$(echo "$end - $start" | bc)
-  iter_elapsed=$(echo "$end - $iter_start" | bc)
-  remaining=$(echo "($elapsed / ($i + 1)) * ($page_count - $i)" | bc)
-  remaining_fmt=$(printf "%02d:%02d:%02d" $((remaining/3600)) $((remaining/60)) $((remaining%60)))
+    # Compute estimated remaining time
+    end=$(date +%s.%N)
+    elapsed=$(echo "$end - $start" | bc)
+    iter_elapsed=$(echo "$end - $iter_start" | bc)
+    remaining=$(echo "($elapsed / ($i + 1)) * ($page_count - $i)" | bc)
+    remaining_fmt=$(printf "%02d:%02d:%02d" $((remaining/3600)) $((remaining/60)) $((remaining%60)))
 
-	logf "Compressed page $((i+1)) in $(printf '%.2f' "$iter_elapsed")s (estimated remaining time $remaining_fmt)\n"
+    logf "Compressed page $((i+1)) in $(printf '%.2f' "$iter_elapsed")s (estimated remaining time $remaining_fmt)\n"
 done
 
 logf "Merging compressed pages to a single PDF\n"