diff --git a/settings.html b/settings.html
index f7f2121..d93cd8f 100644
--- a/settings.html
+++ b/settings.html
@@ -31,7 +31,7 @@
                     Minimum value:
                 </label>
                 <div class="col-2 system charted p-0">
-                    <input type="text" class="form-control" id="minValue">
+                    <input type="text" class="form-control" id="minValue" name="minValue">
                 </div>
             </div>
 
@@ -40,7 +40,7 @@
                     Maximum distance:
                 </label>
                 <div class="col-2 system charted p-0">
-                    <input type="text" class="form-control" id="maxDistance">
+                    <input type="text" class="form-control" id="maxDistance" name="maxDistance">
                 </div>
             </div>
         </div>
diff --git a/src/assets/index.css b/src/assets/index.css
index e971337..081ef6e 100755
--- a/src/assets/index.css
+++ b/src/assets/index.css
@@ -224,4 +224,9 @@ div b.active.landable {
 .separator .btn:hover {
     color: var(--accent-light);
     transition: color 300ms;
+}
+
+.form-error {
+    color: var(--main);
+    margin-left: 1rem;
 }
\ No newline at end of file
diff --git a/src/models/Settings.ts b/src/models/Settings.ts
index 776dc4a..ff874a9 100644
--- a/src/models/Settings.ts
+++ b/src/models/Settings.ts
@@ -1,7 +1,9 @@
-const fs = require('node:fs/promises')
-const { statSync, writeFileSync, readFileSync } = require('node:fs')
-const os = require('node:os')
-const path = require('node:path')
+const fs = require('node:fs/promises');
+const { statSync, writeFileSync, readFileSync } = require('node:fs');
+const os = require('node:os');
+const path = require('node:path');
+
+import { Log } from "./Log";
 
 interface settingsFile {
     minValue: number,
@@ -12,6 +14,7 @@ export class Settings {
     static #instance: Settings;
 
     #file: string;
+    #writing: boolean;
 
     minValue: number;
     maxDistance: number;
@@ -42,6 +45,8 @@ export class Settings {
         const contents: settingsFile = JSON.parse(readFileSync(this.#file, { encoding: 'utf8' }));
         this.minValue = contents.minValue;
         this.maxDistance = contents.maxDistance;
+
+        this.#writing = false;
     }
 
     static get(isPackaged: boolean = false): Settings {
@@ -51,4 +56,24 @@ export class Settings {
 
         return Settings.#instance;
     }
+
+    /* -------------------------------------------------------------------------------- save ---- */
+
+    async save(settings: settingsFile): Promise<boolean> {
+        if (!this.#writing) {
+            try {
+                // So we don't try to write again before this one finishes.
+                this.#writing = true;
+                await fs.writeFile(this.#file, JSON.stringify(settings));
+                this.#writing = false;
+
+                return true;
+            } catch (err) {
+                Log.write(err);
+                return false;
+            }
+        } else {
+            return false;
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/models/UI.js b/src/models/UI.js
index ca50983..91d58a5 100755
--- a/src/models/UI.js
+++ b/src/models/UI.js
@@ -183,4 +183,13 @@ export class UI {
     static setValue(row, value) {
         row.children().filter('.value').text(UI.#formatNumber(value));
     }
+
+    /* ------------------------------------------------------------------------ addFormError ---- */
+
+    static addFormError(field, msg) {
+        const label = $(field).parent().parent().children().filter('label');
+        const error = $('<span>').addClass('form-error');
+        error.text(msg);
+        label.appendChild(error);
+    }
 }
\ No newline at end of file
diff --git a/src/settings.js b/src/settings.js
index d09c4a1..9decd06 100644
--- a/src/settings.js
+++ b/src/settings.js
@@ -4,8 +4,10 @@ import './assets/index.css';
 import './assets/ldom.min';
 
 const { ipcRenderer } = require('electron');
+const { setTimeout } = require('node:timers/promises');
 
 import { Settings } from './models/Settings';
+import { UI } from './models/UI';
 
 const settings = Settings.get();
 
@@ -24,4 +26,44 @@ $('.backBtn').on('click', () => {
 /* ------------------------------------------------------------------- insert current values ---- */
 
 $('#minValue').attr('value', settings.minValue);
-$('#maxDistance').attr('value', settings.maxDistance);
\ No newline at end of file
+$('#maxDistance').attr('value', settings.maxDistance);
+
+/* ---------------------------------------------------------------------------- process form ---- */
+
+$('form').on('submit', async function (event) {
+    event.preventDefault();
+    $('.form-error').remove();
+
+    // Retrieve and normalize data.
+    const formData = new FormData(event.target);
+    const data = Object.fromEntries(formData.entries());
+
+    data.minValue = parseInt(data.minValue.replace(/\D/g, ''));
+    data.maxDistance = parseInt(data.maxDistance.replace(/\D/g, ''));
+
+    // Check for any errors.
+    let errors = false;
+    if (isNaN(data.minValue)) {
+        UI.addFormError('#minValue', 'Please enter a number!');
+        errors = true;
+    }
+
+    if (isNaN(data.maxDistance)) {
+        UI.addFormError('#maxDistance', 'Please enter a number!');
+    }
+
+    // If no errors, save.
+    if (!errors) {
+        let tries = 0;
+        do {
+            let result = await settings.save(data);
+
+            if (!result) {
+                await setTimeout(3000);
+                tries++;
+            } else {
+                break;
+            }
+        } while (tries < 3);
+    }
+});
\ No newline at end of file