diff --git a/web/src/engine/exportEngine.ts b/web/src/engine/exportEngine.ts
index 7c8f62d..16bc13e 100644
--- a/web/src/engine/exportEngine.ts
+++ b/web/src/engine/exportEngine.ts
@@ -33,6 +33,7 @@ import {
   glowUniformArray,
 } from '../../../src/utils/toneShader';
 import { CINEMA_SKSL, getCinemaUniforms, cinemaIsActive } from '../../../src/utils/cinemaShader';
+import { GRAIN_SKSL, GRAIN_SEED, grainCell } from '../../../src/utils/grainShader';
 import {
   drawFrameOnCanvas,
   polaroidLayout,
@@ -432,24 +433,13 @@ export async function renderPhoto(input: RenderInput): Promise<RenderResult | nu
       const grainPaint = own(Skia.Paint());
       grainPaint.setBlendMode(Skia.BlendMode.Overlay);
       grainPaint.setAlphaf(grainAmount / 20);
-      const noiseEffect = own(Skia.RuntimeEffect.Make(`
-        uniform float u;
-        float grainHash(vec2 q) {
-          return fract(sin(dot(q, vec2(12.9898, 78.233))) * 43758.5453);
-        }
-        vec4 main(vec2 pos) {
-          vec2 p = pos.xy / max(u, 1.0);
-          vec2 i = floor(p);
-          vec2 f = p - i;
-          f = f * f * (3.0 - 2.0 * f);
-          float g00 = grainHash(i);
-          float g10 = grainHash(i + vec2(1.0, 0.0));
-          float g01 = grainHash(i + vec2(0.0, 1.0));
-          float g11 = grainHash(i + vec2(1.0, 1.0));
-          return vec4(vec3(mix(mix(g00, g10, f.x), mix(g01, g11, f.x), f.y)), 1.0);
-        }
-      `));
-      const noiseShader = noiseEffect ? own(noiseEffect.makeShader([width / 1080])) : null;
+      // Same shader and same cell rule as the phone's export and the preview
+      // (see src/utils/grainShader.ts): one noise cell per 1/1080 of the
+      // picture's width, floored at one output pixel.
+      const noiseEffect = own(Skia.RuntimeEffect.Make(GRAIN_SKSL));
+      const noiseShader = noiseEffect
+        ? own(noiseEffect.makeShader([grainCell(width), GRAIN_SEED[0], GRAIN_SEED[1]]))
+        : null;
       if (noiseShader) {
         grainPaint.setShader(noiseShader);
         canvas.drawRect(Skia.XYWHRect(0, 0, width, height), grainPaint);