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diff --git a/source/settings/CodeForm.mc b/source/settings/CodeForm.mc
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+// Author:  cirakg & claude ai
+// Summary: The Add code form (README 10.2): reads the code* fields, and CodeCheck, the job that proves a code encodes and fits.
+//
+// read() checks the fields that need no encoding (name, symbology, length).
+// Whether the contents are valid for the symbology is decided by the real
+// encoder (README 12.1), in CodeCheck:
+//   * Linear codes encode at once; the encoder's message ("EAN-13: check
+//     digit should be 7, got 3. Choose 'Fix if wrong' to correct it") becomes
+//     the status, and its note ("check digit 7 added") a remark.
+//   * 2D codes run their MatrixJob step by step (the watchdog), then the
+//     matrix is packed for the encrypted cache in a step of its own, so the
+//     first opening on the watch is instant.
+//   * A code that encodes but doesn't fit this screen is still added, with
+//     the "Too large for this screen" warning (README 12.2).
+
+import Toybox.Lang;
+import Toybox.System;
+
+module CodeForm {
+
+    const SWITCH = "codeAdd";
+    const STATUS = "codeStatus";
+    const PAYLOAD = "codePayload";
+    const NAME_MAX_BYTES = Entry.MAX_NAME_BYTES;
+
+    const FIELDS = ["codeName", "codeSymbology", "codePayload", "codeEcLevel", "codeCheckDigit", "codeShowText", "codeGroup",
+        "codeLocked"];
+
+    // Field values after a reset (resources/settings/properties.xml);
+    // the contents first.
+    function defaults() as Dictionary<String, String or Number or Boolean> {
+        return {
+            PAYLOAD => "",
+            "codeName" => "",
+            "codeSymbology" => Codes.QR,
+            "codeEcLevel" => 1,
+            "codeCheckDigit" => Codes.CHECK_ADD_VERIFY,
+            "codeShowText" => true,
+            "codeGroup" => "",
+            "codeLocked" => false
+        } as Dictionary<String, String or Number or Boolean>;
+    }
+
+    // The entry described by the form (not yet checked by the encoder).
+    function read(store as Forms.Store) as Forms.Parsed {
+        var parsed = new Forms.Parsed("code");
+        for (var i = 0; i < FIELDS.size(); i++) {
+            parsed.content.add(store.get(FIELDS[i] as String));
+        }
+        var e = new Entry();
+        e.kind = Entry.KIND_CODE;
+        e.source = Entry.SOURCE_MANUAL;
+        e.name = Forms.text(store, "codeName");
+        e.group = Forms.text(store, "codeGroup");
+        e.locked = Forms.flag(store, "codeLocked");
+        if (e.name.length() == 0) {
+            return parsed.fail("Name: enter a name for the card");
+        }
+        var problem = Forms.checkName("Name", e.name, NAME_MAX_BYTES);
+        if (problem == null) {
+            problem = Forms.checkName("Group", e.group, Entry.MAX_GROUP_BYTES);
+        }
+        if (problem != null) {
+            return parsed.fail(problem);
+        }
+        var symbology = Forms.number(store, "codeSymbology");
+        if (symbology == null || symbology < Codes.QR || symbology > Codes.AZTEC) {
+            return parsed.fail("Type: choose one of the 12 barcode types");
+        }
+        e.type = symbology;
+        var ec = Forms.number(store, "codeEcLevel");
+        var check = Forms.number(store, "codeCheckDigit");
+        if (ec == null || ec < 0 || ec > Codes.OPT_EC_MASK) {
+            ec = 1;
+        }
+        if (check == null || check < Codes.CHECK_ADD_VERIFY || check > Codes.CHECK_OFF) {
+            check = Codes.CHECK_ADD_VERIFY;
+        }
+        e.options = ec | (check << Codes.OPT_CHECK_SHIFT) | (Forms.flag(store, "codeShowText") ? Codes.OPT_SHOW_TEXT : 0);
+        var payload = contents(Forms.rawText(store, PAYLOAD), symbology);
+        if (payload instanceof String) {
+            return parsed.fail(payload);
+        }
+        e.payload = payload;
+        parsed.entry = e;
+        return parsed;
+    }
+
+    // The contents as stored (trimmed for linear codes, whose digits are
+    // often typed with spaces around), or the problem.
+    function contents(text as String, symbology as Number) as ByteArray or String {
+        var value = Codes.isLinear(symbology) ? Text.trim(text) : text;
+        if (Text.trim(value).length() == 0) {
+            return "Contents: missing";
+        }
+        var bytes = Bytes.fromUtf8(value);
+        if (bytes.size() > Entry.MAX_PAYLOAD_BYTES) {
+            return "Contents: too long (" + bytes.size() + " bytes, at most " + Entry.MAX_PAYLOAD_BYTES + ")";
+        }
+        return bytes;
+    }
+
+    function reset(store as Forms.Store, everything as Boolean) as Void {
+        store.set(PAYLOAD, "");
+        if (everything) {
+            var d = defaults();
+            var keys = d.keys();
+            for (var i = 0; i < keys.size(); i++) {
+                store.set(keys[i], d[keys[i]] as String or Number or Boolean);
+            }
+        }
+        store.set(SWITCH, false);
+    }
+}
+
+// Encodes a code once to prove it is valid and to check that it fits this
+// screen. When step() returns true: error is set, or the code is fine
+// (notes may hold remarks) and, for 2D codes, cache holds Matrix.toBytes().
+class CodeCheck extends Jobs.Job {
+
+    // Linear codes draw with 10 quiet modules on each side (CodeView).
+    static const LINEAR_QUIET = 10;
+
+    var error as String? = null;
+    var notes as Array<String> = [] as Array<String>;
+    var cache as ByteArray? = null;
+
+    private var _symbology as Number;
+    private var _payload as String;
+    private var _options as Number;
+    private var _job as Codes.MatrixJob? = null;
+    private var _matrix as Codes.Matrix? = null;
+    private var _started as Boolean = false;
+    private var _w as Number;
+    private var _h as Number;
+    private var _round as Boolean;
+
+    function initialize(symbology as Number, payload as String, options as Number) {
+        Job.initialize();
+        _symbology = symbology;
+        _payload = payload;
+        _options = options;
+        var screen = System.getDeviceSettings();
+        _w = screen.screenWidth;
+        _h = screen.screenHeight;
+        _round = screen.screenShape == System.SCREEN_SHAPE_ROUND;
+    }
+
+    function step(budget as Number) as Boolean {
+        if (!_started) {
+            _started = true;
+            if (!Codes.isMatrix(_symbology)) {
+                checkLinear();
+                return true;
+            }
+            _job = Codes.matrixJob(_symbology, _payload, _options, _w, _h, _round);
+            _payload = "";
+            return false;
+        }
+        var matrix = _matrix;
+        if (matrix != null) {
+            // Packing gets a step of its own (it runs over every module).
+            cache = matrix.toBytes();
+            _matrix = null;
+            return true;
+        }
+        var job = _job as Codes.MatrixJob;
+        if (!job.step(budget)) {
+            return false;
+        }
+        _job = null;
+        var m = job.matrix();
+        var err = job.error;
+        if (err != null || m == null) {
+            error = withName(err != null ? err : "could not encode");
+            return true;
+        }
+        var totalW = m.width + 2 * m.quiet;
+        var totalH = m.drawnHeight() + 2 * m.quiet;
+        var px = Codes.minModulePx(_symbology);
+        if (!Codes.fits(totalW, totalH, px, _w, _h, _round)) {
+            notes.add("Too large for this screen: needs " + px + " px per module, " + totalW * px + " x " + totalH * px + " px");
+        }
+        _matrix = m;
+        return false;
+    }
+
+    private function checkLinear() as Void {
+        var result = Codes.encode(_symbology, _payload, _options);
+        _payload = "";
+        if (result instanceof Codes.CodeError) {
+            error = withName(result.message);
+            return;
+        }
+        var note = result.note;
+        if (note != null) {
+            notes.add(note);
+        }
+        // The widest band is a little under the screen width on round
+        // screens (CodeView measures it exactly when drawing).
+        var available = _round ? _w * 96 / 100 : _w - 4;
+        var needed = result.modules.size() + 2 * LINEAR_QUIET;
+        if (needed > available) {
+            notes.add("Too large for this screen: needs " + needed + " px, " + available + " px available");
+        }
+    }
+
+    // "too long for QR..." becomes "QR: too long for QR...", but a message
+    // that already names the symbology is kept as it is.
+    private function withName(message as String) as String {
+        var name = Codes.name(_symbology);
+        return message.find(name) == 0 ? message : name + ": " + message;
+    }
+}