diff --git a/src/backends/native/sentry_crash_daemon.c b/src/backends/native/sentry_crash_daemon.c
index 155235d624..e2de2e3c6d 100644
--- a/src/backends/native/sentry_crash_daemon.c
+++ b/src/backends/native/sentry_crash_daemon.c
@@ -3571,6 +3571,30 @@ sentry__process_crash(const sentry_options_t *options, sentry_crash_ipc_t *ipc)
 #endif
 
 cleanup:
+    // Send the staged session-replay envelope same-session, enriched from the
+    // crash event (`<run>/__sentry-event`) so it shares the crash's
+    // tags/contexts/trace.
+    if (options && options->transport) {
+        sentry_value_t crash_event = sentry_value_new_null();
+        if (run_folder) {
+            sentry_path_t *sentry_event_path
+                = sentry__path_join_str(run_folder, "__sentry-event");
+            if (sentry_event_path) {
+                size_t ev_len = 0;
+                char *ev_json
+                    = sentry__path_read_to_buffer(sentry_event_path, &ev_len);
+                if (ev_json) {
+                    crash_event = sentry__value_from_json(ev_json, ev_len);
+                    sentry_free(ev_json);
+                }
+                sentry__path_free(sentry_event_path);
+            }
+        }
+        sentry__session_replay_flush_pending(
+            options, options->transport, crash_event);
+        sentry_value_decref(crash_event);
+    }
+
     // Send all other envelopes from run folder (logs, etc.) before cleanup
     if (run_folder && options && options->transport && options->run) {
         SENTRY_DEBUG("Checking for additional envelopes in run folder");
diff --git a/src/sentry_session_replay.h b/src/sentry_session_replay.h
index e2b21a657e..e92a3f21e1 100644
--- a/src/sentry_session_replay.h
+++ b/src/sentry_session_replay.h
@@ -24,4 +24,18 @@ bool sentry__session_replay_capture(
  */
 sentry_path_t *sentry__session_replay_get_path(const sentry_options_t *options);
 
+/**
+ * Build and send the session-replay envelope(s) the embedder staged in
+ * `<database>/replays/` (a `replay-<id>.json` sidecar next to its mp4). Native-
+ * daemon-only: called out-of-process by the crash daemon, so it runs only on a
+ * crash and delivers same-session. Sources are left on disk for the embedder to
+ * clear.
+ *
+ * `scope_source` is the crash event (`<run>/__sentry-event`); its scope fields
+ * and trace id are copied onto the replay, and its timestamp ends the replay
+ * window. Null skips enrichment.
+ */
+void sentry__session_replay_flush_pending(const sentry_options_t *options,
+    sentry_transport_t *transport, sentry_value_t scope_source);
+
 #endif
diff --git a/src/session_replay/sentry_session_replay.c b/src/session_replay/sentry_session_replay.c
index 3799d56f58..953c7cf6ea 100644
--- a/src/session_replay/sentry_session_replay.c
+++ b/src/session_replay/sentry_session_replay.c
@@ -1,7 +1,341 @@
 #include "sentry_session_replay.h"
 
+#include "sentry_core.h"
+#include "sentry_database.h"
+#include "sentry_envelope.h"
+#include "sentry_json.h"
+#include "sentry_string.h"
+#include "sentry_utils.h"
+#include "sentry_value.h"
+
+#if defined(_MSC_VER)
+#    pragma warning(push)
+#    pragma warning(disable : 4127) // conditional expression is constant
+#    if defined(__clang__) // clang-cl
+#        pragma clang diagnostic push
+#        pragma clang diagnostic ignored "-Wdocumentation"
+#        pragma clang diagnostic ignored "-Wpre-c11-compat"
+#    endif
+#elif defined(__clang__)
+#    pragma clang diagnostic push
+#    pragma clang diagnostic ignored "-Wstatic-in-inline"
+#endif
+
+#include "../vendor/mpack.h"
+
+#if defined(_MSC_VER)
+#    pragma warning(pop)
+#    ifdef __clang__ // clang-cl
+#        pragma clang diagnostic pop
+#    endif
+#elif defined(__clang__)
+#    pragma clang diagnostic pop
+#endif
+
+#include <stdio.h>
+
 sentry_path_t *
 sentry__session_replay_get_path(const sentry_options_t *options)
 {
     return sentry__path_join_str(options->run->run_path, "session-replay.mp4");
 }
+
+static sentry_path_t *
+session_replay_dir(const sentry_options_t *options)
+{
+    if (!options->run || !options->run->run_path) {
+        return NULL;
+    }
+    sentry_path_t *db_dir = sentry__path_dir(options->run->run_path);
+    if (!db_dir) {
+        return NULL;
+    }
+    sentry_path_t *replays = sentry__path_join_str(db_dir, "replays");
+    sentry__path_free(db_dir);
+    return replays;
+}
+
+// Build the replay_event from the recorder's metadata. When `scope_source` (the
+// crash event) is non-null, its scope fields and trace id are copied onto the
+// replay so it shares the crash's context. `error_ids` is omitted (deprecated).
+static sentry_value_t
+build_replay_event(sentry_value_t meta, const char *replay_id, double start_sec,
+    double end_sec, int32_t segment_id, sentry_value_t scope_source)
+{
+    const char *replay_type
+        = sentry_value_as_string(sentry_value_get_by_key(meta, "replayType"));
+
+    sentry_value_t event = sentry_value_new_object();
+    sentry_value_set_by_key(
+        event, "type", sentry_value_new_string("replay_event"));
+    sentry_value_set_by_key(event, "replay_type",
+        sentry_value_new_string(
+            replay_type && replay_type[0] ? replay_type : "buffer"));
+    sentry_value_set_by_key(
+        event, "segment_id", sentry_value_new_int32(segment_id));
+    sentry_value_set_by_key(
+        event, "replay_id", sentry_value_new_string(replay_id));
+    sentry_value_set_by_key(
+        event, "event_id", sentry_value_new_string(replay_id));
+    sentry_value_set_by_key(
+        event, "platform", sentry_value_new_string("native"));
+    sentry_value_set_by_key(
+        event, "timestamp", sentry_value_new_double(end_sec));
+    sentry_value_set_by_key(
+        event, "replay_start_timestamp", sentry_value_new_double(start_sec));
+    sentry_value_set_by_key(event, "urls", sentry_value_new_list());
+
+    if (!sentry_value_is_null(scope_source)) {
+        static const char *const scope_keys[] = { "tags", "contexts", "release",
+            "environment", "dist", "user", "sdk" };
+        for (size_t i = 0; i < sizeof(scope_keys) / sizeof(scope_keys[0]);
+            i++) {
+            sentry_value_t v
+                = sentry_value_get_by_key(scope_source, scope_keys[i]);
+            if (!sentry_value_is_null(v)) {
+                sentry_value_incref(v);
+                sentry_value_set_by_key(event, scope_keys[i], v);
+            }
+        }
+
+        sentry_value_t trace_id = sentry_value_get_by_key(
+            sentry_value_get_by_key(
+                sentry_value_get_by_key(scope_source, "contexts"), "trace"),
+            "trace_id");
+        sentry_value_t trace_ids = sentry_value_new_list();
+        if (!sentry_value_is_null(trace_id)) {
+            sentry_value_incref(trace_id);
+            sentry_value_append(trace_ids, trace_id);
+        }
+        sentry_value_set_by_key(event, "trace_ids", trace_ids);
+    }
+    return event;
+}
+
+// Build the rrweb recording list (meta event + video event) describing the
+// clip.
+static sentry_value_t
+build_replay_recording(sentry_value_t meta, double start_sec,
+    int32_t segment_id, double size_bytes, double duration_ms)
+{
+    const int32_t width
+        = sentry_value_as_int32(sentry_value_get_by_key(meta, "width"));
+    const int32_t height
+        = sentry_value_as_int32(sentry_value_get_by_key(meta, "height"));
+    const double ts_ms = start_sec * 1000.0;
+
+    sentry_value_t meta_data = sentry_value_new_object();
+    sentry_value_set_by_key(meta_data, "href", sentry_value_new_string(""));
+    sentry_value_set_by_key(meta_data, "width", sentry_value_new_int32(width));
+    sentry_value_set_by_key(
+        meta_data, "height", sentry_value_new_int32(height));
+    sentry_value_t meta_event = sentry_value_new_object();
+    sentry_value_set_by_key(meta_event, "type", sentry_value_new_int32(4));
+    sentry_value_set_by_key(
+        meta_event, "timestamp", sentry_value_new_double(ts_ms));
+    sentry_value_set_by_key(meta_event, "data", meta_data);
+
+    sentry_value_t payload = sentry_value_new_object();
+    sentry_value_set_by_key(
+        payload, "segmentId", sentry_value_new_int32(segment_id));
+    sentry_value_set_by_key(
+        payload, "size", sentry_value_new_double(size_bytes));
+    sentry_value_set_by_key(
+        payload, "duration", sentry_value_new_double(duration_ms));
+    sentry_value_set_by_key(
+        payload, "encoding", sentry_value_new_string("h264"));
+    sentry_value_set_by_key(
+        payload, "container", sentry_value_new_string("mp4"));
+    sentry_value_set_by_key(payload, "height", sentry_value_new_int32(height));
+    sentry_value_set_by_key(payload, "width", sentry_value_new_int32(width));
+    sentry_value_set_by_key(payload, "left", sentry_value_new_int32(0));
+    sentry_value_set_by_key(payload, "top", sentry_value_new_int32(0));
+    sentry_value_set_by_key(payload, "frameCount",
+        sentry_value_new_int32(sentry_value_as_int32(
+            sentry_value_get_by_key(meta, "frameCount"))));
+    sentry_value_set_by_key(payload, "frameRate",
+        sentry_value_new_int32(
+            sentry_value_as_int32(sentry_value_get_by_key(meta, "frameRate"))));
+    sentry_value_set_by_key(
+        payload, "frameRateType", sentry_value_new_string("variable"));
+    sentry_value_t video_data = sentry_value_new_object();
+    sentry_value_set_by_key(
+        video_data, "tag", sentry_value_new_string("video"));
+    sentry_value_set_by_key(video_data, "payload", payload);
+    sentry_value_t video_event = sentry_value_new_object();
+    sentry_value_set_by_key(video_event, "type", sentry_value_new_int32(5));
+    sentry_value_set_by_key(
+        video_event, "timestamp", sentry_value_new_double(ts_ms));
+    sentry_value_set_by_key(video_event, "data", video_data);
+
+    sentry_value_t recording = sentry_value_new_list();
+    sentry_value_append(recording, meta_event);
+    sentry_value_append(recording, video_event);
+    return recording;
+}
+
+// Build the replay_video envelope from the parsed sidecar + its mp4. `end_sec`
+// is the window end (crash time); <= 0 falls back to the sidecar's. NULL on
+// failure.
+static sentry_envelope_t *
+build_replay_envelope(const sentry_options_t *options, sentry_value_t meta,
+    const sentry_path_t *mp4_path, double end_sec, sentry_value_t scope_source)
+{
+    if (sentry_value_is_null(meta) || !mp4_path) {
+        return NULL;
+    }
+
+    const char *replay_id
+        = sentry_value_as_string(sentry_value_get_by_key(meta, "replayId"));
+    if (!replay_id || !replay_id[0]) {
+        return NULL;
+    }
+
+    size_t video_len = 0;
+    char *video = sentry__path_read_to_buffer(mp4_path, &video_len);
+    if (!video || video_len == 0) {
+        sentry_free(video);
+        return NULL;
+    }
+
+    const double duration_ms
+        = sentry_value_as_double(sentry_value_get_by_key(meta, "durationMs"));
+    if (end_sec <= 0.0) {
+        end_sec = sentry_value_as_double(
+            sentry_value_get_by_key(meta, "endTimestampSec"));
+    }
+    const double start_sec = end_sec - duration_ms / 1000.0;
+    const int32_t segment_id
+        = sentry_value_as_int32(sentry_value_get_by_key(meta, "segmentId"));
+
+    sentry_value_t event = build_replay_event(
+        meta, replay_id, start_sec, end_sec, segment_id, scope_source);
+    sentry_value_t recording = build_replay_recording(
+        meta, start_sec, segment_id, (double)video_len, duration_ms);
+
+    sentry_envelope_t *envelope = NULL;
+
+    size_t event_len = 0;
+    char *event_json = sentry__value_to_json(event, &event_len);
+    size_t rrweb_len = 0;
+    char *rrweb_json = sentry__value_to_json(recording, &rrweb_len);
+
+    if (event_json && rrweb_json) {
+        // replay_recording = `{"segment_id":N}\n` + the rrweb array.
+        char hdr[48];
+        int hdr_len
+            = snprintf(hdr, sizeof(hdr), "{\"segment_id\":%d}\n", segment_id);
+
+        sentry_stringbuilder_t rb;
+        sentry__stringbuilder_init(&rb);
+        sentry__stringbuilder_append_buf(&rb, hdr, (size_t)hdr_len);
+        sentry__stringbuilder_append_buf(&rb, rrweb_json, rrweb_len);
+        size_t recording_len = sentry__stringbuilder_len(&rb);
+        char *recording_buf = sentry__stringbuilder_into_string(&rb);
+
+        // replay_video item body: msgpack map of three raw blobs.
+        mpack_writer_t writer;
+        char *body = NULL;
+        size_t body_len = 0;
+        mpack_writer_init_growable(&writer, &body, &body_len);
+        mpack_start_map(&writer, 3);
+        mpack_write_cstr(&writer, "replay_event");
+        mpack_write_bin(&writer, event_json, (uint32_t)event_len);
+        mpack_write_cstr(&writer, "replay_recording");
+        mpack_write_bin(&writer, recording_buf, (uint32_t)recording_len);
+        mpack_write_cstr(&writer, "replay_video");
+        mpack_write_bin(&writer, video, (uint32_t)video_len);
+        mpack_finish_map(&writer);
+        bool body_ok = mpack_writer_destroy(&writer) == mpack_ok;
+
+        sentry_free(recording_buf);
+
+        if (body_ok && body) {
+            envelope = sentry__envelope_new();
+            if (envelope) {
+                sentry__envelope_set_header(
+                    envelope, "event_id", sentry_value_new_string(replay_id));
+                const char *dsn = sentry_options_get_dsn(options);
+                if (dsn && dsn[0]) {
+                    sentry__envelope_set_header(
+                        envelope, "dsn", sentry_value_new_string(dsn));
+                }
+                sentry__envelope_add_from_buffer(
+                    envelope, body, body_len, "replay_video");
+            }
+        }
+        sentry_free(body);
+    }
+
+    sentry_free(rrweb_json);
+    sentry_free(event_json);
+    sentry_value_decref(event);
+    sentry_value_decref(recording);
+    sentry_free(video);
+    return envelope;
+}
+
+void
+sentry__session_replay_flush_pending(const sentry_options_t *options,
+    sentry_transport_t *transport, sentry_value_t scope_source)
+{
+    if (!options || !transport) {
+        return;
+    }
+
+    sentry_path_t *dir = session_replay_dir(options);
+    if (!dir) {
+        return;
+    }
+    if (!sentry__path_is_dir(dir)) {
+        sentry__path_free(dir);
+        return;
+    }
+
+    // End the replay window at the crash time (from the crash event); falls
+    // back to the sidecar's own end timestamp in build_replay_envelope.
+    double end_sec = 0.0;
+    if (!sentry_value_is_null(scope_source)) {
+        const char *ts = sentry_value_as_string(
+            sentry_value_get_by_key(scope_source, "timestamp"));
+        if (ts && ts[0]) {
+            uint64_t usec = sentry__iso8601_to_usec(ts);
+            if (usec) {
+                end_sec = (double)usec / 1000000.0;
+            }
+        }
+    }
+
+    sentry_pathiter_t *iter = sentry__path_iter_directory(dir);
+    const sentry_path_t *file;
+    while (iter && (file = sentry__pathiter_next(iter)) != NULL) {
+        if (!sentry__path_ends_with(file, ".json")) {
+            continue;
+        }
+
+        size_t json_len = 0;
+        char *json = sentry__path_read_to_buffer(file, &json_len);
+        if (!json) {
+            continue;
+        }
+        sentry_value_t meta = sentry__value_from_json(json, json_len);
+        sentry_free(json);
+
+        const char *video_filename = sentry_value_as_string(
+            sentry_value_get_by_key(meta, "videoFilename"));
+        sentry_path_t *mp4_path = (video_filename && video_filename[0])
+            ? sentry__path_join_str(dir, video_filename)
+            : NULL;
+
+        sentry_envelope_t *envelope = build_replay_envelope(
+            options, meta, mp4_path, end_sec, scope_source);
+        if (envelope) {
+            sentry__capture_envelope(transport, envelope, options);
+        }
+
+        sentry__path_free(mp4_path);
+        sentry_value_decref(meta);
+    }
+    sentry__pathiter_free(iter);
+    sentry__path_free(dir);
+}