diff --git a/src/OnCanvasTextBox.js b/src/OnCanvasTextBox.js
index 4beb427..1c864e5 100644
--- a/src/OnCanvasTextBox.js
+++ b/src/OnCanvasTextBox.js
@@ -124,14 +124,14 @@ class OnCanvasTextBox extends OnCanvasObject {
 }
 
 function draw_text_wrapped(ctx, text, x, y, maxWidth, lineHeight) {
-    const original_lines = text.split(/\r\n|[\n\v\f\r\x85\u2028\u2029]/);
+	const original_lines = text.split(/\r\n|[\n\v\f\r\x85\u2028\u2029]/);
 
-    for (const original_line of original_lines) {
-        const words = original_line.split(' ');
-        let line = '';
-        let test;
-        let metrics;
-        for (let i = 0; i < words.length; i++) {
+	for (const original_line of original_lines) {
+		const words = original_line.split(' ');
+		let line = '';
+		let test;
+		let metrics;
+		for (let i = 0; i < words.length; i++) {
 			test = words[i];
 			metrics = ctx.measureText(test);
 			// TODO: break words on hyphens and perhaps other characters
@@ -156,7 +156,7 @@ function draw_text_wrapped(ctx, text, x, y, maxWidth, lineHeight) {
 				line = test;
 			}
 		}
-        ctx.fillText(line, x, y);
-        y += lineHeight;
-    }
+		ctx.fillText(line, x, y);
+		y += lineHeight;
+	}
 }
diff --git a/src/functions.js b/src/functions.js
index ceac2bb..8746d18 100644
--- a/src/functions.js
+++ b/src/functions.js
@@ -340,13 +340,13 @@ function open_from_File(file, callback, canceled){
 	});
 }
 function get_image_file_from_FileList_or_show_error(files, user_input_method_verb_past_tense){
-    for (const file of files) {
-        if(file.type.match(/^image/)){
+	for (const file of files) {
+		if(file.type.match(/^image/)){
 			return file;
 		}
-    }
+	}
 
-    if(files.length > 1){
+	if(files.length > 1){
 		show_error_message("None of the files " + user_input_method_verb_past_tense + " appear to be images.");
 	}else{
 		show_error_message("File " + user_input_method_verb_past_tense + " does not appear to be an image.");
diff --git a/src/image-manipulation.js b/src/image-manipulation.js
index 7756a8c..e0600eb 100644
--- a/src/image-manipulation.js
+++ b/src/image-manipulation.js
@@ -242,25 +242,25 @@ function draw_fill(ctx, start_x, start_y, fill_r, fill_g, fill_b, fill_a){
 	}
 	
 	while(stack.length){
-        let new_pos;
-        let x;
-        let y;
-        var pixel_pos;
-        let reach_left;
-        let reach_right;
-        new_pos = stack.pop();
-        x = new_pos[0];
-        y = new_pos[1];
+		let new_pos;
+		let x;
+		let y;
+		var pixel_pos;
+		let reach_left;
+		let reach_right;
+		new_pos = stack.pop();
+		x = new_pos[0];
+		y = new_pos[1];
 
-        pixel_pos = (y*c_width + x) * 4;
-        while(matches_start_color(pixel_pos)){
+		pixel_pos = (y*c_width + x) * 4;
+		while(matches_start_color(pixel_pos)){
 			y--;
 			pixel_pos = (y*c_width + x) * 4;
 		}
-        reach_left = false;
-        reach_right = false;
-        // eslint-disable-next-line no-constant-condition
-        while(true){
+		reach_left = false;
+		reach_right = false;
+		// eslint-disable-next-line no-constant-condition
+		while(true){
 			y++;
 			pixel_pos = (y*c_width + x) * 4;
 			
@@ -294,7 +294,7 @@ function draw_fill(ctx, start_x, start_y, fill_r, fill_g, fill_b, fill_a){
 
 			pixel_pos += c_width * 4;
 		}
-    }
+	}
 	ctx.putImageData(id, 0, 0);
 
 	function matches_start_color(pixel_pos){
@@ -715,8 +715,8 @@ function draw_grid(ctx, scale) {
 		const vertexSrc = [
 			'attribute vec4 position;',
 			'void main() {',
-			'    /* already in normalized coordinates, so just pass through */',
-			'    gl_Position = position;',
+			'	/* already in normalized coordinates, so just pass through */',
+			'	gl_Position = position;',
 			'}'
 		].join('');
 		const vertexShader = gl.createShader(gl.VERTEX_SHADER);
@@ -734,7 +734,7 @@ function draw_grid(ctx, scale) {
 		const fragmentSrc = [
 			'precision mediump float;',
 			'void main() {',
-			'    gl_FragColor = vec4(0, 0, 0, 1);',
+			'	gl_FragColor = vec4(0, 0, 0, 1);',
 			'}'
 		].join('');
 		const fragmentShader = gl.createShader(gl.FRAGMENT_SHADER);
diff --git a/src/sessions.js b/src/sessions.js
index 9bbb2eb..a65e1e7 100644
--- a/src/sessions.js
+++ b/src/sessions.js
@@ -366,25 +366,25 @@
 					// Load the new image data
 					const img = new Image();
 					img.onload = () => {
-                        // Cancel any in-progress pointer operations
-                        if (pointer_operations.length) {
+						// Cancel any in-progress pointer operations
+						if (pointer_operations.length) {
 							$G.triggerHandler("pointerup", "cancel");
 						}
-                        // Write the image data to the canvas
-                        ctx.copy(img);
-                        $canvas_area.trigger("resize");
-                        // (detect_transparency() here would not be ideal
-                        // Perhaps a better way of syncing transparency
-                        // and other options will be established)
-                        // Playback recorded in-progress pointer operations
-                        window.console && console.log("playback", pointer_operations);
+						// Write the image data to the canvas
+						ctx.copy(img);
+						$canvas_area.trigger("resize");
+						// (detect_transparency() here would not be ideal
+						// Perhaps a better way of syncing transparency
+						// and other options will be established)
+						// Playback recorded in-progress pointer operations
+						window.console && console.log("playback", pointer_operations);
 
-                        for (const e of pointer_operations) {
-                            // Trigger the event at each place it is listened for
-                            $canvas.triggerHandler(e, ["synthetic"]);
-                            $G.triggerHandler(e, ["synthetic"]);
-                        }
-                    };
+						for (const e of pointer_operations) {
+							// Trigger the event at each place it is listened for
+							$canvas.triggerHandler(e, ["synthetic"]);
+							$G.triggerHandler(e, ["synthetic"]);
+						}
+					};
 					img.src = uri;
 				}
 			}, error => {