diff --git a/cmd/server/routes.go b/cmd/server/routes.go
index fb12bda..14fe63f 100644
--- a/cmd/server/routes.go
+++ b/cmd/server/routes.go
@@ -18,6 +18,7 @@ func mapRoutes(mux *http.ServeMux) {
 	mux.HandleFunc("/app", id(sess(app.VaultHandler), true))
 	mux.HandleFunc("/app/generator", id(sess(app.GeneratorHandler), true))
 	mux.HandleFunc("/app/generator-hx", id(sess(app.GeneratorHxHandler), true))
+	mux.HandleFunc("/app/export/bitwarden", id(sess(app.ExportBitwardenHandler), true))
 	mux.HandleFunc("/app/vault-hx", id(sess(app.VaultHxHandler), true))
 	mux.HandleFunc("/app/delete/{id}", id(sess(app.DeleteHandler), true))
 	mux.HandleFunc("/app/editor/add", id(sess(app.EditorHandler), true))
diff --git a/entries/bitwarden.go b/entries/bitwarden.go
new file mode 100644
index 0000000..d7e8cb3
--- /dev/null
+++ b/entries/bitwarden.go
@@ -0,0 +1,85 @@
+package entries
+
+import "time"
+
+const bitwardenLoginItemType = 1
+
+// BitwardenExport represents Bitwarden's plaintext JSON vault export format.
+// MaxWarden does not have folders, so every item is exported at the vault root.
+type BitwardenExport struct {
+	Encrypted bool            `json:"encrypted"`
+	Folders   []any           `json:"folders"`
+	Items     []BitwardenItem `json:"items"`
+}
+
+type BitwardenItem struct {
+	PasswordHistory []any          `json:"passwordHistory"`
+	RevisionDate    string         `json:"revisionDate"`
+	CreationDate    string         `json:"creationDate"`
+	DeletedDate     *string        `json:"deletedDate"`
+	ID              string         `json:"id"`
+	OrganizationID  *string        `json:"organizationId"`
+	FolderID        *string        `json:"folderId"`
+	Type            int            `json:"type"`
+	Reprompt        int            `json:"reprompt"`
+	Name            string         `json:"name"`
+	Notes           string         `json:"notes"`
+	Favorite        bool           `json:"favorite"`
+	Login           BitwardenLogin `json:"login"`
+	CollectionIDs   []string       `json:"collectionIds"`
+}
+
+type BitwardenLogin struct {
+	URIs     []BitwardenURI `json:"uris"`
+	Username string         `json:"username"`
+	Password string         `json:"password"`
+	TOTP     *string        `json:"totp"`
+}
+
+type BitwardenURI struct {
+	Match *int   `json:"match"`
+	URI   string `json:"uri"`
+}
+
+func NewBitwardenExport(secrets []Secret) BitwardenExport {
+	items := make([]BitwardenItem, 0, len(secrets))
+
+	for _, secret := range secrets {
+		uris := make([]BitwardenURI, 0, 1)
+		if secret.URL != "" {
+			uris = append(uris, BitwardenURI{URI: secret.URL})
+		}
+
+		items = append(items, BitwardenItem{
+			PasswordHistory: nil,
+			RevisionDate:    bitwardenTime(secret.Modified),
+			CreationDate:    bitwardenTime(secret.Created),
+			ID:              secret.ID,
+			Type:            bitwardenLoginItemType,
+			Reprompt:        0,
+			Name:            secret.Description,
+			Notes:           secret.Notes,
+			Favorite:        false,
+			Login: BitwardenLogin{
+				URIs:     uris,
+				Username: secret.Username,
+				Password: secret.Password,
+			},
+			CollectionIDs: nil,
+		})
+	}
+
+	return BitwardenExport{
+		Encrypted: false,
+		Folders:   make([]any, 0),
+		Items:     items,
+	}
+}
+
+func bitwardenTime(value time.Time) string {
+	if value.IsZero() {
+		return ""
+	}
+
+	return value.UTC().Format(time.RFC3339Nano)
+}
diff --git a/entries/bitwarden_test.go b/entries/bitwarden_test.go
new file mode 100644
index 0000000..ac97d81
--- /dev/null
+++ b/entries/bitwarden_test.go
@@ -0,0 +1,81 @@
+package entries
+
+import (
+	"encoding/json"
+	"testing"
+	"time"
+)
+
+func TestNewBitwardenExport(t *testing.T) {
+	created := time.Date(2026, time.September, 3, 12, 30, 0, 0, time.FixedZone("EDT", -4*60*60))
+	modified := created.Add(15 * time.Minute)
+
+	export := NewBitwardenExport([]Secret{{
+		ID:          "c381ca2b-0f53-4b05-b209-f2eb11f05e19",
+		Description: "Example",
+		URL:         "https://example.com/login",
+		Notes:       "A note",
+		Username:    "person@example.com",
+		Password:    "correct horse battery staple",
+		Created:     created,
+		Modified:    modified,
+	}})
+
+	if export.Encrypted {
+		t.Fatal("plaintext Bitwarden export must set encrypted to false")
+	}
+	if export.Folders == nil || len(export.Folders) != 0 {
+		t.Fatalf("expected a non-nil empty folders array, got %#v", export.Folders)
+	}
+	if len(export.Items) != 1 {
+		t.Fatalf("expected one item, got %d", len(export.Items))
+	}
+
+	item := export.Items[0]
+	if item.Type != bitwardenLoginItemType {
+		t.Fatalf("expected login item type %d, got %d", bitwardenLoginItemType, item.Type)
+	}
+	if item.Name != "Example" || item.Notes != "A note" {
+		t.Fatalf("item metadata was not mapped: %#v", item)
+	}
+	if item.Login.Username != "person@example.com" || item.Login.Password != "correct horse battery staple" {
+		t.Fatalf("login credentials were not mapped: %#v", item.Login)
+	}
+	if len(item.Login.URIs) != 1 || item.Login.URIs[0].URI != "https://example.com/login" {
+		t.Fatalf("login URI was not mapped: %#v", item.Login.URIs)
+	}
+	if item.CreationDate != "2026-09-03T16:30:00Z" || item.RevisionDate != "2026-09-03T16:45:00Z" {
+		t.Fatalf("timestamps were not normalized to UTC: %#v", item)
+	}
+
+	encoded, err := json.Marshal(export)
+	if err != nil {
+		t.Fatalf("marshal export: %v", err)
+	}
+
+	var document map[string]any
+	if err := json.Unmarshal(encoded, &document); err != nil {
+		t.Fatalf("unmarshal export: %v", err)
+	}
+	if _, ok := document["encrypted"]; !ok {
+		t.Fatal("export is missing encrypted field")
+	}
+	if _, ok := document["folders"]; !ok {
+		t.Fatal("export is missing folders field")
+	}
+	if _, ok := document["items"]; !ok {
+		t.Fatal("export is missing items field")
+	}
+}
+
+func TestNewBitwardenExportWithoutURLOrDates(t *testing.T) {
+	export := NewBitwardenExport([]Secret{{Description: "No URL"}})
+	item := export.Items[0]
+
+	if item.Login.URIs == nil || len(item.Login.URIs) != 0 {
+		t.Fatalf("expected an empty URI array, got %#v", item.Login.URIs)
+	}
+	if item.CreationDate != "" || item.RevisionDate != "" {
+		t.Fatalf("zero timestamps should be empty strings: %#v", item)
+	}
+}
diff --git a/handlers/app/export_bitwarden.go b/handlers/app/export_bitwarden.go
new file mode 100644
index 0000000..ff84b49
--- /dev/null
+++ b/handlers/app/export_bitwarden.go
@@ -0,0 +1,108 @@
+package app
+
+import (
+	"encoding/json"
+	"maxwarden/entries"
+	"maxwarden/middleware"
+	"maxwarden/query"
+	"maxwarden/security"
+	. "maxwarden/ui"
+	"maxwarden/users"
+	"net/http"
+	"time"
+
+	. "maragu.dev/gomponents"
+	. "maragu.dev/gomponents/html"
+)
+
+func ExportBitwardenHandler(w http.ResponseWriter, r *http.Request) {
+	identity := middleware.GetIdentity(r)
+	session := middleware.GetSession(r)
+
+	renderView := func(errorMessage string) {
+		AppLayout("Export Vault", *identity, session,
+			Card(
+				Heading("Bitwarden JSON export"),
+				P(Text("Download your MaxWarden vault as a plaintext JSON file that can be imported into Bitwarden.")),
+				P(
+					InlineStyle("$me { margin-top: $3; color: $color(red-700); font-weight: var(--font-weight-semibold); }"),
+					Text("Warning: the downloaded file contains all usernames and passwords in plaintext. Store it securely and delete it when you are finished."),
+				),
+				If(errorMessage != "",
+					P(
+						InlineStyle("$me { margin-top: $3; color: $color(red-700); }"),
+						Text(errorMessage),
+					),
+				),
+				Form(
+					InlineStyle("$me { margin-top: $5; }"),
+					Action("/app/export/bitwarden"),
+					Method(http.MethodPost),
+					FormLabel(Text("Confirm your master key")),
+					FormInput(
+						Type("password"),
+						Name("password"),
+						AutoComplete("current-password"),
+						Required(),
+					),
+					Br(),
+					ButtonUIDanger(Type("submit"), Text("Download plaintext export")),
+				),
+			),
+		).Render(w)
+	}
+
+	switch r.Method {
+	case http.MethodGet:
+		renderView("")
+		return
+	case http.MethodPost:
+		// Continue below.
+	default:
+		w.Header().Set("Allow", http.MethodGet+", "+http.MethodPost)
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	r.Body = http.MaxBytesReader(w, r.Body, 1<<20)
+	if err := r.ParseForm(); err != nil {
+		http.Error(w, "Invalid export request", http.StatusBadRequest)
+		return
+	}
+
+	user, err := users.FetchById(identity.UserID)
+	if err != nil {
+		http.Error(w, "Unable to verify account", http.StatusInternalServerError)
+		return
+	}
+
+	if !security.ComparePasswords(r.Form.Get("password"), user.Password) {
+		w.WriteHeader(http.StatusUnauthorized)
+		renderView("The master key is incorrect.")
+		return
+	}
+
+	secretList, err := entries.Filter(entries.EntryFilter{
+		Filter:    query.NewFilterFromSearch(map[string]string{}),
+		UserId:    identity.UserID,
+		MasterKey: identity.MasterKey,
+	})
+	if err != nil {
+		http.Error(w, "Unable to decrypt vault", http.StatusInternalServerError)
+		return
+	}
+
+	document, err := json.MarshalIndent(entries.NewBitwardenExport(secretList), "", "  ")
+	if err != nil {
+		http.Error(w, "Unable to create export", http.StatusInternalServerError)
+		return
+	}
+
+	filename := "maxwarden-bitwarden-export-" + time.Now().UTC().Format("2006-01-02") + ".json"
+	w.Header().Set("Cache-Control", "no-store")
+	w.Header().Set("Content-Disposition", `attachment; filename="`+filename+`"`)
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	w.Header().Set("Pragma", "no-cache")
+	w.Header().Set("X-Content-Type-Options", "nosniff")
+	w.Write(document)
+}
diff --git a/ui/app_layout.go b/ui/app_layout.go
index e4ad50b..24f8d29 100644
--- a/ui/app_layout.go
+++ b/ui/app_layout.go
@@ -28,6 +28,7 @@ var NavGroups = []NavGroup{
 		Title: "Tools",
 		SubGroup: []NavGroup{
 			{SectionId: LAYOUT_SECTION_TOOLS, Title: "Generator", URL: "/app/generator"},
+			{SectionId: LAYOUT_SECTION_TOOLS, Title: "Export", URL: "/app/export/bitwarden"},
 		},
 	},
 }