diff --git a/packages/app/src/session/commands/export.test.ts b/packages/app/src/session/commands/export.test.ts
index 156cd825d87..4d94b5e76e1 100644
--- a/packages/app/src/session/commands/export.test.ts
+++ b/packages/app/src/session/commands/export.test.ts
@@ -14,6 +14,10 @@ describe("sessionExportFilename", () => {
   ])("names %o as %s", (session, filename) => {
     expect(sessionExportFilename(session)).toBe(filename)
   })
+
+  test("shortens long titles to fit the filename limit", () => {
+    expect(sessionExportFilename({ id: "ses_123", title: "a".repeat(300) })).toBe(`${"a".repeat(250)}.json`)
+  })
 })
 
 describe("fetchSessionExport", () => {
diff --git a/packages/app/src/session/commands/export.ts b/packages/app/src/session/commands/export.ts
index 52dc3037c34..88f21c47a8d 100644
--- a/packages/app/src/session/commands/export.ts
+++ b/packages/app/src/session/commands/export.ts
@@ -43,6 +43,7 @@ export function sessionExportFilename(session: { id: string; title?: string; slu
   const clean = name
     .toLowerCase()
     .replace(/[^a-z0-9_-]+/gi, "-")
+    .slice(0, 250)
     .replace(/^-+|-+$/g, "")
 
   return `${clean || session.id}.json`