diff --git a/frontend/src/App.svelte b/frontend/src/App.svelte
index 50c204e..753f831 100644
--- a/frontend/src/App.svelte
+++ b/frontend/src/App.svelte
@@ -4,12 +4,17 @@
   import ProcessingControls from './lib/components/ProcessingControls.svelte';
   import ProgressDisplay from './lib/components/ProgressDisplay.svelte';
   import ResultsView from './lib/components/ResultsView.svelte';
+  import SettingsPanel from './lib/components/SettingsPanel.svelte';
 
   let connectionOk = $state(false);
   let selectedPerson = $state(null);
   let jobStatus = $state('idle');
   let progress = $state({ completed: 0, total: 0, message: '' });
 
+  let isJobRunning = $derived(
+    jobStatus === 'running' || jobStatus === 'compiling_video' || jobStatus === 'cancelling'
+  );
+
   function handleConnectionChange(data) {
     connectionOk = data.connected;
   }
@@ -31,10 +36,14 @@
   </header>
 
   {#if connectionOk}
+    <section class="settings">
+      <SettingsPanel disabled={isJobRunning} />
+    </section>
+
     <section class="controls">
       <PeopleSelector
         onselect={handlePersonSelect}
-        disabled={jobStatus === 'running' || jobStatus === 'compiling_video'}
+        disabled={isJobRunning}
       />
 
       {#if selectedPerson}
diff --git a/frontend/src/lib/components/SettingsPanel.svelte b/frontend/src/lib/components/SettingsPanel.svelte
new file mode 100644
index 0000000..8b2f255
--- /dev/null
+++ b/frontend/src/lib/components/SettingsPanel.svelte
@@ -0,0 +1,382 @@
+<script>
+  import { onMount } from 'svelte';
+
+  let { disabled = false } = $props();
+
+  let isOpen = $state(false);
+  let loading = $state(true);
+  let saving = $state(false);
+  let error = $state(null);
+  let saveMessage = $state(null);
+
+  // Config state
+  let config = $state({
+    processing: {
+      resize_size: 512,
+      face_resolution_threshold: 80,
+      pose_threshold: 25.0,
+      ear_threshold: 0.2,
+      max_workers: 4,
+      keep_intermediates: false,
+    },
+    video: {
+      framerate: 15,
+      enabled: true,
+      codec: 'libx264',
+      crf: 23,
+    },
+  });
+
+  async function loadConfig() {
+    loading = true;
+    error = null;
+    try {
+      const res = await fetch('/api/config');
+      if (!res.ok) throw new Error('Failed to load config');
+      config = await res.json();
+    } catch (e) {
+      error = e.message;
+    } finally {
+      loading = false;
+    }
+  }
+
+  async function saveConfig() {
+    saving = true;
+    error = null;
+    saveMessage = null;
+    try {
+      const res = await fetch('/api/config', {
+        method: 'PUT',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify(config),
+      });
+      if (!res.ok) {
+        const data = await res.json().catch(() => ({}));
+        throw new Error(data.message || 'Failed to save config');
+      }
+      config = await res.json();
+      saveMessage = 'Settings saved';
+      setTimeout(() => (saveMessage = null), 2000);
+    } catch (e) {
+      error = e.message;
+    } finally {
+      saving = false;
+    }
+  }
+
+  function toggle() {
+    isOpen = !isOpen;
+    if (isOpen && loading) {
+      loadConfig();
+    }
+  }
+
+  onMount(() => {
+    loadConfig();
+  });
+</script>
+
+<div class="settings-panel">
+  <button class="toggle-btn" onclick={toggle}>
+    <span class="icon">{isOpen ? '▼' : '▶'}</span>
+    Settings
+  </button>
+
+  {#if isOpen}
+    <div class="settings-content">
+      {#if loading}
+        <p class="loading">Loading settings...</p>
+      {:else if error}
+        <p class="error">{error}</p>
+        <button class="retry-btn" onclick={loadConfig}>Retry</button>
+      {:else}
+        <div class="settings-grid">
+          <fieldset disabled={disabled || saving}>
+            <legend>Processing</legend>
+
+            <label>
+              <span>Output Size (px)</span>
+              <input
+                type="number"
+                bind:value={config.processing.resize_size}
+                min="128"
+                max="2048"
+                step="64"
+              />
+            </label>
+
+            <label>
+              <span>Min Face Size (px)</span>
+              <input
+                type="number"
+                bind:value={config.processing.face_resolution_threshold}
+                min="20"
+                max="500"
+                step="10"
+              />
+            </label>
+
+            <label>
+              <span>Pose Threshold (deg)</span>
+              <input
+                type="number"
+                bind:value={config.processing.pose_threshold}
+                min="5"
+                max="90"
+                step="5"
+              />
+            </label>
+
+            <label>
+              <span>Eye Aspect Ratio</span>
+              <input
+                type="number"
+                bind:value={config.processing.ear_threshold}
+                min="0.1"
+                max="0.5"
+                step="0.05"
+              />
+            </label>
+
+            <label>
+              <span>Parallel Workers</span>
+              <input
+                type="number"
+                bind:value={config.processing.max_workers}
+                min="1"
+                max="32"
+                step="1"
+              />
+            </label>
+
+            <label class="checkbox-label">
+              <input type="checkbox" bind:checked={config.processing.keep_intermediates} />
+              <span>Keep debug images</span>
+            </label>
+          </fieldset>
+
+          <fieldset disabled={disabled || saving}>
+            <legend>Video</legend>
+
+            <label>
+              <span>Framerate (fps)</span>
+              <input
+                type="number"
+                bind:value={config.video.framerate}
+                min="1"
+                max="60"
+                step="1"
+              />
+            </label>
+
+            <label>
+              <span>Quality (CRF)</span>
+              <input
+                type="number"
+                bind:value={config.video.crf}
+                min="0"
+                max="51"
+                step="1"
+              />
+              <span class="hint">Lower = better quality, larger file</span>
+            </label>
+
+            <label>
+              <span>Codec</span>
+              <select bind:value={config.video.codec}>
+                <option value="libx264">H.264 (libx264)</option>
+                <option value="libx265">H.265 (libx265)</option>
+                <option value="libvpx-vp9">VP9 (libvpx-vp9)</option>
+              </select>
+            </label>
+
+            <label class="checkbox-label">
+              <input type="checkbox" bind:checked={config.video.enabled} />
+              <span>Auto-compile video</span>
+            </label>
+          </fieldset>
+        </div>
+
+        <div class="actions">
+          <button class="save-btn" onclick={saveConfig} disabled={disabled || saving}>
+            {saving ? 'Saving...' : 'Save Settings'}
+          </button>
+          {#if saveMessage}
+            <span class="save-message">{saveMessage}</span>
+          {/if}
+        </div>
+      {/if}
+    </div>
+  {/if}
+</div>
+
+<style>
+  .settings-panel {
+    background: #1a1a1a;
+    border-radius: 8px;
+    margin-bottom: 1rem;
+  }
+
+  .toggle-btn {
+    width: 100%;
+    padding: 1rem 1.5rem;
+    background: none;
+    border: none;
+    color: #e0e0e0;
+    font-size: 0.875rem;
+    font-weight: 600;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    text-align: left;
+  }
+
+  .toggle-btn:hover {
+    background: #252525;
+  }
+
+  .icon {
+    font-size: 0.75rem;
+    color: #888;
+  }
+
+  .settings-content {
+    padding: 0 1.5rem 1.5rem;
+  }
+
+  .loading,
+  .error {
+    font-size: 0.875rem;
+    padding: 1rem;
+    text-align: center;
+  }
+
+  .error {
+    color: #dc2626;
+  }
+
+  .retry-btn {
+    display: block;
+    margin: 0 auto;
+    padding: 0.5rem 1rem;
+    background: #333;
+    border: none;
+    border-radius: 4px;
+    color: #e0e0e0;
+    cursor: pointer;
+  }
+
+  .settings-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
+    gap: 1.5rem;
+  }
+
+  fieldset {
+    border: 1px solid #333;
+    border-radius: 6px;
+    padding: 1rem;
+  }
+
+  fieldset:disabled {
+    opacity: 0.5;
+  }
+
+  legend {
+    font-size: 0.75rem;
+    font-weight: 600;
+    color: #888;
+    text-transform: uppercase;
+    letter-spacing: 0.05em;
+    padding: 0 0.5rem;
+  }
+
+  label {
+    display: flex;
+    flex-direction: column;
+    gap: 0.25rem;
+    margin-bottom: 0.75rem;
+  }
+
+  label > span:first-child {
+    font-size: 0.75rem;
+    color: #888;
+  }
+
+  input[type='number'],
+  select {
+    padding: 0.5rem 0.75rem;
+    border: 1px solid #333;
+    border-radius: 4px;
+    background: #0f0f0f;
+    color: #e0e0e0;
+    font-size: 0.875rem;
+  }
+
+  input[type='number']:focus,
+  select:focus {
+    outline: none;
+    border-color: #4f46e5;
+  }
+
+  select {
+    cursor: pointer;
+  }
+
+  .checkbox-label {
+    flex-direction: row;
+    align-items: center;
+    gap: 0.5rem;
+  }
+
+  .checkbox-label input {
+    width: 1rem;
+    height: 1rem;
+    accent-color: #4f46e5;
+  }
+
+  .checkbox-label span {
+    font-size: 0.875rem;
+    color: #e0e0e0;
+  }
+
+  .hint {
+    font-size: 0.7rem;
+    color: #666;
+  }
+
+  .actions {
+    margin-top: 1.5rem;
+    display: flex;
+    align-items: center;
+    gap: 1rem;
+  }
+
+  .save-btn {
+    padding: 0.75rem 1.5rem;
+    background: #4f46e5;
+    border: none;
+    border-radius: 6px;
+    color: #fff;
+    font-size: 0.875rem;
+    font-weight: 600;
+    cursor: pointer;
+    transition: all 0.15s ease;
+  }
+
+  .save-btn:hover:not(:disabled) {
+    background: #4338ca;
+  }
+
+  .save-btn:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
+  }
+
+  .save-message {
+    font-size: 0.875rem;
+    color: #22c55e;
+  }
+</style>
diff --git a/src/web/handlers.rs b/src/web/handlers.rs
index 57185b4..cd08e9d 100644
--- a/src/web/handlers.rs
+++ b/src/web/handlers.rs
@@ -1,5 +1,6 @@
 //! HTTP route handlers.
 
+use crate::config::{ProcessingConfig, VideoConfig};
 use crate::immich_api::ImmichClient;
 use crate::job::{run_job, JobParams};
 use crate::web::state::{AppState, JobStatus, Progress};
@@ -8,7 +9,7 @@ use axum::{
     extract::{Path, State},
     http::{header, StatusCode},
     response::{Html, IntoResponse, Json, Response},
-    routing::{delete, get, post},
+    routing::{delete, get, post, put},
     Router,
 };
 use serde::{Deserialize, Serialize};
@@ -37,6 +38,8 @@ pub fn create_router(state: AppState) -> Router {
         .route("/api/cancel", post(cancel_processing))
         .route("/api/output", delete(cleanup_all_output))
         .route("/api/output/{folder_name}", delete(cleanup_output_folder))
+        .route("/api/config", get(get_config))
+        .route("/api/config", put(update_config))
         // Serve output files (video, images)
         .nest_service("/output", ServeDir::new(output_dir))
         // Serve frontend static files (fallback to index.html for SPA routing)
@@ -403,3 +406,109 @@ async fn cleanup_output_folder(
         message: format!("Deleted folder '{}'", folder_name),
     }))
 }
+
+/// Configuration response (excludes sensitive API credentials).
+/// Reuses config types which already derive Serialize.
+#[derive(Serialize)]
+struct ConfigResponse {
+    processing: ProcessingConfig,
+    video: VideoConfig,
+}
+
+/// Get current configuration (excluding sensitive data).
+async fn get_config(State(state): State<AppState>) -> Json<ConfigResponse> {
+    let config = state.config.read().await;
+
+    Json(ConfigResponse {
+        processing: config.processing.clone(),
+        video: config.video.clone(),
+    })
+}
+
+/// Configuration update request.
+#[derive(Deserialize)]
+struct ConfigUpdateRequest {
+    processing: Option<ProcessingConfigUpdate>,
+    video: Option<VideoConfigUpdate>,
+}
+
+#[derive(Deserialize)]
+struct ProcessingConfigUpdate {
+    resize_size: Option<u32>,
+    face_resolution_threshold: Option<u32>,
+    pose_threshold: Option<f32>,
+    ear_threshold: Option<f32>,
+    max_workers: Option<usize>,
+    keep_intermediates: Option<bool>,
+}
+
+#[derive(Deserialize)]
+struct VideoConfigUpdate {
+    framerate: Option<u32>,
+    enabled: Option<bool>,
+    codec: Option<String>,
+    crf: Option<u32>,
+}
+
+/// Update configuration.
+async fn update_config(
+    State(state): State<AppState>,
+    Json(update): Json<ConfigUpdateRequest>,
+) -> Result<Json<ConfigResponse>, (StatusCode, String)> {
+    // Check if a job is running
+    {
+        let progress = state.progress.read().await;
+        if progress.status == JobStatus::Running || progress.status == JobStatus::CompilingVideo {
+            return Err((
+                StatusCode::CONFLICT,
+                "Cannot update config while a job is running".to_string(),
+            ));
+        }
+    }
+
+    // Update config
+    {
+        let mut config = state.config.write().await;
+
+        if let Some(proc) = update.processing {
+            if let Some(v) = proc.resize_size {
+                config.processing.resize_size = v;
+            }
+            if let Some(v) = proc.face_resolution_threshold {
+                config.processing.face_resolution_threshold = v;
+            }
+            if let Some(v) = proc.pose_threshold {
+                config.processing.pose_threshold = v;
+            }
+            if let Some(v) = proc.ear_threshold {
+                config.processing.ear_threshold = v;
+            }
+            if let Some(v) = proc.max_workers {
+                config.processing.max_workers = v;
+            }
+            if let Some(v) = proc.keep_intermediates {
+                config.processing.keep_intermediates = v;
+            }
+        }
+
+        if let Some(vid) = update.video {
+            if let Some(v) = vid.framerate {
+                config.video.framerate = v;
+            }
+            if let Some(v) = vid.enabled {
+                config.video.enabled = v;
+            }
+            if let Some(v) = vid.codec {
+                config.video.codec = v;
+            }
+            if let Some(v) = vid.crf {
+                config.video.crf = v;
+            }
+        }
+
+        tracing::info!("Configuration updated");
+    }
+
+    // Return updated config
+    Ok(get_config(State(state)).await)
+}