diff --git a/src/etherpad2latex.nim b/src/etherpad2latex.nim
index 1eec0af..52454ff 100644
--- a/src/etherpad2latex.nim
+++ b/src/etherpad2latex.nim
@@ -28,13 +28,16 @@ when isMainModule:
         texFile = workingDir / pad & ".tex"
         pdfFile = workingDir / pad & ".pdf"
 
-      writeFile(texFile, content)
-  
-      let (output, exitCode) = execCmdEx(quoteShellCommand(["pdflatex", "-halt-on-error", texFile]))
-      if exitCode == 0:
-        resp(Http200, readFile(pdfFile), contentType = "application/pdf")
+      if fileExists(texFile) and readFile(texFile) == content and fileExists(pdfFile):
+        # Use file from cache
+        resp(Http200, readFile(pdfFile), contentType="application/pdf")
       else:
-        resp output
+        writeFile(texFile, content)
+        let (output, exitCode) = execCmdEx(quoteShellCommand(["pdflatex", "-halt-on-error", texFile]))
+        if exitCode == 0:
+          resp(Http200, readFile(pdfFile), contentType="application/pdf")
+        else:
+          resp output
 
   let s = newSettings(port=Port(opts.port.parseInt))
   var j = initJester(main, settings=s)