diff --git a/tools/chatgui/src/avatars/avatarcrop.cpp b/tools/chatgui/src/avatars/avatarcrop.cpp
new file mode 100644
index 00000000..d96e9040
--- /dev/null
+++ b/tools/chatgui/src/avatars/avatarcrop.cpp
@@ -0,0 +1,90 @@
+#include "avatarcrop.h"
+#include "avatarcache.h"
+#include <QDialog>
+#include <QDialogButtonBox>
+#include <QFileInfo>
+#include <QImageReader>
+#include <QLabel>
+#include <QMouseEvent>
+#include <QPainter>
+#include <QPointer>
+#include <QPushButton>
+#include <QRunnable>
+#include <QThreadPool>
+#include <QVBoxLayout>
+#include <QWheelEvent>
+extern "C" {
+#include "debug_config.h"
+}
+
+namespace {
+class CropView : public QWidget {
+public:
+    QImage image;
+    explicit CropView(QWidget* parent) : QWidget(parent) { setMinimumSize(320, 320); setCursor(Qt::OpenHandCursor); }
+    QRectF frame() const { const double side = qMin(width(), height()) * 0.8; return {(width()-side)/2, (height()-side)/2, side, side}; }
+    double scale() const { return qMax(frame().width()/image.width(), frame().height()/image.height()) * zoom; }
+    void clamp() {
+        if (image.isNull()) return;
+        const double s = scale(), mx = (image.width()*s-frame().width())/2, my = (image.height()*s-frame().height())/2;
+        offset = {qBound(-mx, offset.x(), mx), qBound(-my, offset.y(), my)};
+    }
+    QRectF selection() const {
+        const double s = scale();
+        const QPointF top = rect().center() + offset - QPointF(image.width()*s/2, image.height()*s/2);
+        const QRectF f = frame();
+        return {(f.x()-top.x())/s/image.width(), (f.y()-top.y())/s/image.height(), f.width()/s/image.width(), f.height()/s/image.height()};
+    }
+protected:
+    void paintEvent(QPaintEvent*) override {
+        QPainter p(this); p.fillRect(rect(), QColor(20,20,22)); if (image.isNull()) return;
+        clamp(); const double s = scale(); const QSizeF size(image.width()*s, image.height()*s);
+        p.setRenderHint(QPainter::SmoothPixmapTransform);
+        p.drawImage(QRectF(QPointF(width()/2.0,height()/2.0)+offset-QPointF(size.width()/2,size.height()/2), size), image);
+        QPainterPath mask; mask.addRect(rect()); mask.addRect(frame()); p.fillPath(mask, QColor(0,0,0,150));
+        p.setPen(QPen(Qt::white, 2)); p.drawRect(frame());
+    }
+    void wheelEvent(QWheelEvent* e) override {
+        if (image.isNull()) return;
+        const double previous = zoom; zoom = qBound(1.0, zoom * (e->angleDelta().y()>0 ? 1.15 : 1/1.15), 16.0);
+        offset *= zoom/previous; clamp(); update(); e->accept();
+    }
+    void mousePressEvent(QMouseEvent* e) override { if (e->button()==Qt::LeftButton) { last=e->pos(); dragging=true; } }
+    void mouseMoveEvent(QMouseEvent* e) override { if (dragging) { offset+=e->pos()-last; last=e->pos(); clamp(); update(); } }
+    void mouseReleaseEvent(QMouseEvent*) override { dragging=false; }
+private:
+    double zoom = 1; QPointF offset; QPoint last; bool dragging = false;
+};
+}
+
+bool selectAvatarCrop(const QString& source, QRectF& crop, QWidget* parent) {
+    QDialog dialog(parent); dialog.setWindowTitle(QCoreApplication::translate("ChatGui", "Crop avatar")); dialog.resize(620,650);
+    auto* layout = new QVBoxLayout(&dialog); auto* view = new CropView(&dialog); layout->addWidget(view, 1);
+    auto* status = new QLabel(QCoreApplication::translate("ChatGui", "Drag photo and use the wheel to select a square"), &dialog);
+    layout->addWidget(status); auto* buttons = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel, &dialog);
+    buttons->button(QDialogButtonBox::Ok)->setText(QCoreApplication::translate("ChatGui", "Upload avatar"));
+    buttons->button(QDialogButtonBox::Ok)->setEnabled(false); layout->addWidget(buttons);
+    QObject::connect(buttons, &QDialogButtonBox::accepted, &dialog, &QDialog::accept);
+    QObject::connect(buttons, &QDialogButtonBox::rejected, &dialog, &QDialog::reject);
+    QPointer<CropView> guard(view); QPointer<QDialog> owner(&dialog);
+    QThreadPool::globalInstance()->start(QRunnable::create([source, guard, owner, status, buttons] {
+        QImageReader reader(source); reader.setAutoTransform(true); const QSize size = reader.size(); QImage image;
+        if (QFileInfo(source).size() <= AvatarCache::OriginalMaxBytes && size.isValid() &&
+            qint64(size.width())*size.height() <= 16*1024*1024 &&
+            (reader.format()=="jpeg" || reader.format()=="png" || reader.format()=="webp")) {
+            reader.setScaledSize(size.scaled(1600,1600,Qt::KeepAspectRatio)); image = reader.read();
+        }
+        if (!owner) return;
+        QMetaObject::invokeMethod(owner, [guard, image, status, buttons] {
+            if (!guard) return;
+            if (image.isNull()) {
+                DEBUG_WARN(DEBUG_CATEGORY_MEDIA, "avatar: editor cannot decode selected source");
+                status->setText(QCoreApplication::translate("ChatGui", "Cannot load avatar image")); return;
+            }
+            guard->image=image; guard->update(); buttons->button(QDialogButtonBox::Ok)->setEnabled(true);
+        }, Qt::QueuedConnection);
+    }));
+    if (dialog.exec()!=QDialog::Accepted) { DEBUG_DEBUG(DEBUG_CATEGORY_MEDIA, "avatar: crop cancelled"); return false; }
+    crop=view->selection(); DEBUG_INFO(DEBUG_CATEGORY_MEDIA, "avatar: crop selected x=%.5f y=%.5f w=%.5f h=%.5f",
+        crop.x(), crop.y(), crop.width(), crop.height()); return true;
+}
diff --git a/tools/chatgui/src/avatars/avatarcrop.h b/tools/chatgui/src/avatars/avatarcrop.h
new file mode 100644
index 00000000..41d3dd94
--- /dev/null
+++ b/tools/chatgui/src/avatars/avatarcrop.h
@@ -0,0 +1,6 @@
+/* Модальный выбор квадрата: рамка неподвижна, фото перемещается и масштабируется. */
+#pragma once
+#include <QRectF>
+#include <QString>
+class QWidget;
+bool selectAvatarCrop(const QString& source, QRectF& crop, QWidget* parent);
diff --git a/tools/chatgui/src/settingsdialog.cpp b/tools/chatgui/src/settingsdialog.cpp
index b0be30d4..48e9dca8 100644
--- a/tools/chatgui/src/settingsdialog.cpp
+++ b/tools/chatgui/src/settingsdialog.cpp
@@ -10,6 +10,7 @@
 #include "storagesettingspage.h"
 #include "radiosettingspage.h"
 #include "avatars/avatarmanager.h"
+#include "avatars/avatarcrop.h"
 #include "ptt_hotkey_manager.h"
 #include "connmonitorwindow.h"
 #include "../transport/gui_bridge.h"
@@ -118,7 +119,9 @@ SettingsDialog::SettingsDialog(const QString& configPath, DbManager* db, UtunNod
         connect(upload, &QPushButton::clicked, controls, [avatars, server, controls] {
             const QString path = QFileDialog::getOpenFileName(controls, QCoreApplication::translate("ChatGui", "Choose avatar"), {},
                 QCoreApplication::translate("ChatGui", "Images (*.png *.jpg *.jpeg *.webp)"));
-            if (!path.isEmpty()) avatars->uploadDefault(path, server->currentData().toULongLong());
+            QRectF crop;
+            if (!path.isEmpty() && selectAvatarCrop(path, crop, controls))
+                avatars->uploadDefault(path, server->currentData().toULongLong(), crop);
         });
         connect(clear, &QPushButton::clicked, avatars, &AvatarManager::clearDefault); update();
     }