diff --git a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/PdfRenderController.cs b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/PdfRenderController.cs
index 0958384a..a85987bc 100644
--- a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/PdfRenderController.cs
+++ b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/PdfRenderController.cs
@@ -4,13 +4,17 @@ using EnvelopeGenerator.Application.Common.Interfaces.Doc;
 using EnvelopeGenerator.Domain.Constants;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Caching.Memory;
+using System.Security.Cryptography;
 
 namespace EnvelopeGenerator.Server.Controllers;
 
 [ApiController]
 [Route("api/[controller]")]
-public class PdfRenderController(IPdfPageImageRenderer renderer) : ControllerBase
+public class PdfRenderController(IPdfPageImageRenderer renderer, IMemoryCache memoryCache) : ControllerBase
 {
+    private static readonly TimeSpan RenderCacheDuration = TimeSpan.FromMinutes(5);
+
     // TODO(perf): Replace JSON/base64 transport for PdfBytes with application/octet-stream (or multipart) and stream-based request parsing to reduce payload size and allocation pressure for large PDFs.
     [HttpPost("pages")]
     [Authorize(AuthenticationSchemes = AuthScheme.Sender)]
@@ -19,7 +23,19 @@ public class PdfRenderController(IPdfPageImageRenderer renderer) : ControllerBas
         if (request?.PdfBytes is not { Length: > 0 } bytes)
             return BadRequest("Missing PDF bytes.");
 
+        var cacheKey = BuildCacheKey(bytes);
+        if (memoryCache.TryGetValue(cacheKey, out IReadOnlyList<PdfPageImageDto>? cachedPages) && cachedPages is not null)
+            return Ok(cachedPages);
+
         IReadOnlyList<PdfPageImageDto> pages = await renderer.RenderPagesAsImagesAsync(bytes, cancel);
+        memoryCache.Set(cacheKey, pages, RenderCacheDuration);
+
         return Ok(pages);
     }
+
+    private static string BuildCacheKey(byte[] pdfBytes)
+    {
+        var hash = Convert.ToHexString(SHA256.HashData(pdfBytes));
+        return $"pdf-render:pages:v1:dpi110:{hash}";
+    }
 }