diff --git a/_config.php b/_config.php
index 9e519d4a..71c7914c 100644
--- a/_config.php
+++ b/_config.php
@@ -5,5 +5,4 @@
 
 // Avoid creating global variables
 call_user_func(function () {
-
 });
diff --git a/src/Extensions/AjaxField.php b/src/Extensions/AjaxField.php
index 7764c65c..de9e3ad6 100644
--- a/src/Extensions/AjaxField.php
+++ b/src/Extensions/AjaxField.php
@@ -4,6 +4,7 @@
 
 use SilverStripe\Core\Extension;
 use SilverStripe\Forms\FormField;
+use SilverStripe\Dev\Deprecation;
 
 /**
  * Tweak fields that need to be served through the DynamicLink form schema and need to be able to receive AJAX calls.
@@ -11,9 +12,19 @@
  * For example the TreeDropdownField need to be able to receive AJAX request to fetch the list of available SiteTrees.
  *
  * This is a bit hackish. There's probably a less dumb way of doing this.
+ *
+ * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
  */
 class AjaxField extends Extension
 {
+    public function __construct()
+    {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it', Deprecation::SCOPE_CLASS);
+        });
+        parent::__construct();
+    }
+
     public function updateLink(&$link, $action)
     {
         /** @var FormField $owner */
diff --git a/src/Extensions/FormFactoryExtension.php b/src/Extensions/FormFactoryExtension.php
index 1491f924..0bf10abb 100644
--- a/src/Extensions/FormFactoryExtension.php
+++ b/src/Extensions/FormFactoryExtension.php
@@ -8,14 +8,24 @@
 use SilverStripe\Forms\FormAction;
 use SilverStripe\LinkField\Form\FormFactory;
 use SilverStripe\LinkField\Models\Link;
+use SilverStripe\Dev\Deprecation;
 
 /**
  * Enhance the insert / edit link button label to match the model data state
  *
  * @method FormFactory getOwner()
+ * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
  */
 class FormFactoryExtension extends Extension
 {
+    public function __construct()
+    {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it', Deprecation::SCOPE_CLASS);
+        });
+        parent::__construct();
+    }
+
     /**
      * Extension point in @see FormFactory::getFormActions()
      *
diff --git a/src/Extensions/LeftAndMain.php b/src/Extensions/LeftAndMain.php
index d1173a3d..a19760f6 100644
--- a/src/Extensions/LeftAndMain.php
+++ b/src/Extensions/LeftAndMain.php
@@ -4,12 +4,23 @@
 
 use SilverStripe\Core\Extension;
 use SilverStripe\LinkField\Type\Registry;
+use SilverStripe\Dev\Deprecation;
 
 /**
  * Register a new Form Schema in LeftAndMain.
+ *
+ * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
  */
 class LeftAndMain extends Extension
 {
+    public function __construct()
+    {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it', Deprecation::SCOPE_CLASS);
+        });
+        parent::__construct();
+    }
+
     public function init()
     {
         // Get the Link Registry to load all the JS requirements for managing Links.
diff --git a/src/Extensions/ModalController.php b/src/Extensions/ModalController.php
index 4df18011..a65c5775 100644
--- a/src/Extensions/ModalController.php
+++ b/src/Extensions/ModalController.php
@@ -12,12 +12,15 @@
 use SilverStripe\LinkField\Models\Link;
 use SilverStripe\LinkField\Type\Registry;
 use SilverStripe\ORM\DataObject;
+use SilverStripe\Dev\Deprecation;
 
 /**
  * Extensions to apply to ModalController so it knows how to handle the DynamicLink action.
  *
  * This action receive a link type key and some link data as a JSON string and retrieve a Form Schema for a
  * specific Link Type.
+ *
+ * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
  */
 class ModalController extends Extension
 {
@@ -29,6 +32,14 @@ class ModalController extends Extension
         'DynamicLink',
     ];
 
+    public function __construct()
+    {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it', Deprecation::SCOPE_CLASS);
+        });
+        parent::__construct();
+    }
+
     /**
      * Builds and returns the external link form
      *
diff --git a/src/Form/FormFactory.php b/src/Form/FormFactory.php
index e9f57f5c..f85981c3 100644
--- a/src/Form/FormFactory.php
+++ b/src/Form/FormFactory.php
@@ -7,12 +7,22 @@
 use SilverStripe\Forms\HiddenField;
 use SilverStripe\LinkField\Type\Type;
 use SilverStripe\ORM\DataObject;
+use SilverStripe\Dev\Deprecation;
 
 /**
  * Create Form schema for the LinkField based on a key provided by the request.
+ *
+ * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
  */
 class FormFactory extends LinkFormFactory
 {
+    public function __construct()
+    {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it', Deprecation::SCOPE_CLASS);
+        });
+    }
+
     protected function getFormFields($controller, $name, $context)
     {
         /** @var Type $type */
diff --git a/src/Form/JsonField.php b/src/Form/JsonField.php
index 4f7ad0b6..b3b3ce7e 100644
--- a/src/Form/JsonField.php
+++ b/src/Form/JsonField.php
@@ -7,17 +7,28 @@
 use SilverStripe\LinkField\JsonData;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\ORM\DataObjectInterface;
+use SilverStripe\Dev\Deprecation;
 
 /**
  * Field designed to edit complex data passed as a JSON string. Other FormFields can be built on top of this one.
  *
  * It will output a hidden input with serialize JSON Data.
+ *
+ * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
  */
 abstract class JsonField extends FormField
 {
     protected $schemaDataType = FormField::SCHEMA_DATA_TYPE_CUSTOM;
     protected $inputType = 'hidden';
 
+    public function __construct($name, $title = null, $value = null)
+    {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it', Deprecation::SCOPE_CLASS);
+        });
+        parent::__construct($name, $title, $value);
+    }
+
     public function setValue($value, $data = null)
     {
         if ($value && $value instanceof JsonData) {
diff --git a/src/GraphQL/LinkDescriptionResolver.php b/src/GraphQL/LinkDescriptionResolver.php
index 2259f25d..d1cf704d 100644
--- a/src/GraphQL/LinkDescriptionResolver.php
+++ b/src/GraphQL/LinkDescriptionResolver.php
@@ -6,9 +6,20 @@
 use InvalidArgumentException;
 use SilverStripe\GraphQL\Schema\DataObject\Resolver;
 use SilverStripe\LinkField\Type\Registry;
+use SilverStripe\Dev\Deprecation;
 
+/**
+ * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
+ */
 class LinkDescriptionResolver extends Resolver
 {
+    public function __construct()
+    {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it', Deprecation::SCOPE_CLASS);
+        });
+    }
+
     public static function resolve($obj, $args = [], $context = [], ?ResolveInfo $info = null)
     {
         $data = json_decode($args['dataStr'], true);
diff --git a/src/GraphQL/LinkTypeResolver.php b/src/GraphQL/LinkTypeResolver.php
index a61f28f1..1da94930 100644
--- a/src/GraphQL/LinkTypeResolver.php
+++ b/src/GraphQL/LinkTypeResolver.php
@@ -7,9 +7,20 @@
 use SilverStripe\GraphQL\Schema\DataObject\Resolver;
 use SilverStripe\LinkField\Type\Registry;
 use SilverStripe\LinkField\Type\Type;
+use SilverStripe\Dev\Deprecation;
 
+/**
+ * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
+ */
 class LinkTypeResolver extends Resolver
 {
+    public function __construct()
+    {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it', Deprecation::SCOPE_CLASS);
+        });
+    }
+
     public static function resolve($obj, $args = [], $context = [], ?ResolveInfo $info = null)
     {
         if (isset($args['keys']) && !is_array($args['keys'])) {
diff --git a/src/JsonData.php b/src/JsonData.php
index 89ba7201..c2521da8 100644
--- a/src/JsonData.php
+++ b/src/JsonData.php
@@ -6,6 +6,8 @@
 
 /**
  * An object that can be serialized and deserialized to JSON.
+ *
+ * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
  */
 interface JsonData extends JsonSerializable
 {
diff --git a/src/Models/EmailLink.php b/src/Models/EmailLink.php
index 410455db..c0398716 100644
--- a/src/Models/EmailLink.php
+++ b/src/Models/EmailLink.php
@@ -4,6 +4,7 @@
 
 use SilverStripe\Forms\EmailField;
 use SilverStripe\Forms\FieldList;
+use SilverStripe\Dev\Deprecation;
 
 /**
  * A link to an Email address.
@@ -18,8 +19,14 @@ class EmailLink extends Link
         'Email' => 'Varchar(255)',
     ];
 
+    /**
+     * @deprecated 3.0.0 Will be removed in linkfield v4 which will use getDescription() instead
+     */
     public function generateLinkDescription(array $data): string
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed in linkfield v4 which will use getDescription() instead.');
+        });
         return isset($data['Email']) ? $data['Email'] : '';
     }
 
diff --git a/src/Models/ExternalLink.php b/src/Models/ExternalLink.php
index c51fb50c..5e4a2f5f 100644
--- a/src/Models/ExternalLink.php
+++ b/src/Models/ExternalLink.php
@@ -2,6 +2,8 @@
 
 namespace SilverStripe\LinkField\Models;
 
+use SilverStripe\Dev\Deprecation;
+
 /**
  * A link to an external URL.
  *
@@ -15,8 +17,14 @@ class ExternalLink extends Link
         'ExternalUrl' => 'Varchar',
     ];
 
+    /**
+     * @deprecated 3.0.0 Will be removed in linkfield v4 which will use getDescription() instead
+     */
     public function generateLinkDescription(array $data): string
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed in linkfield v4 which will use getDescription() instead.');
+        });
         return isset($data['ExternalUrl']) ? $data['ExternalUrl'] : '';
     }
 
diff --git a/src/Models/FileLink.php b/src/Models/FileLink.php
index 0d40b933..e015c476 100644
--- a/src/Models/FileLink.php
+++ b/src/Models/FileLink.php
@@ -3,6 +3,7 @@
 namespace SilverStripe\LinkField\Models;
 
 use SilverStripe\Assets\File;
+use SilverStripe\Dev\Deprecation;
 
 /**
  * A link to a File track in asset-admin
@@ -18,8 +19,14 @@ class FileLink extends Link
         'File' => File::class,
     ];
 
+    /**
+     * @deprecated 3.0.0 Will be removed in linkfield v4 which will use getDescription() instead
+     */
     public function generateLinkDescription(array $data): string
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed in linkfield v4 which will use getDescription() instead.');
+        });
         $fileId = $data['FileID'] ?? null;
 
         if (!$fileId) {
@@ -31,8 +38,14 @@ public function generateLinkDescription(array $data): string
         return $file?->getFilename() ?? '';
     }
 
+    /**
+     * @deprecated 3.0.0 Will be renamed to getLinkTypeHandlerName() is linkfield v4
+     */
     public function LinkTypeHandlerName(): string
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be renamed to getLinkTypeHandlerName() is linkfield v4.');
+        });
         return 'InsertMediaModal';
     }
 
diff --git a/src/Models/Link.php b/src/Models/Link.php
index 87d2de0f..e84fb645 100644
--- a/src/Models/Link.php
+++ b/src/Models/Link.php
@@ -16,6 +16,7 @@
 use SilverStripe\ORM\DataObject;
 use SilverStripe\ORM\FieldType\DBHTMLText;
 use SilverStripe\View\Requirements;
+use SilverStripe\Dev\Deprecation;
 
 /**
  * A Link Data Object. This class should be a subclass, and you should never directly interact with a plain Link
@@ -40,30 +41,60 @@ class Link extends DataObject implements JsonData, Type
      */
     private ?string $linkType = null;
 
+    /**
+     * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
+     */
     public function defineLinkTypeRequirements()
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it.');
+        });
         Requirements::add_i18n_javascript('silverstripe/linkfield:client/lang', false, true);
         Requirements::javascript('silverstripe/linkfield:client/dist/js/bundle.js');
         Requirements::css('silverstripe/linkfield:client/dist/styles/bundle.css');
     }
 
+    /**
+     * @deprecated 3.0.0 Will be renamed to getLinkTypeHandlerName() is linkfield v4
+     */
     public function LinkTypeHandlerName(): string
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be renamed to getLinkTypeHandlerName() is linkfield v4.');
+        });
         return 'FormBuilderModal';
     }
 
+    /**
+     * @deprecated 3.0.0 Will be removed in linkfield v4 which will use getDescription() instead
+     */
     public function generateLinkDescription(array $data): string
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed in linkfield v4 which will use getDescription() instead');
+        });
         return '';
     }
 
+    /**
+     * @deprecated 3.0.0 Will be removed in linkfield v4 which will use getMenuTitle() instead
+     */
     public function LinkTypeTile(): string
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed in linkfield v4 which will use getMenuTitle() instead.');
+        });
         return $this->i18n_singular_name();
     }
 
+    /**
+     * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
+     */
     public function scaffoldLinkFields(array $data): FieldList
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it.');
+        });
         return $this->getCMSFields();
     }
 
@@ -115,9 +146,13 @@ public function getCMSCompositeValidator(): CompositeValidator
      * We use this to work with an in-memory only field
      *
      * @param $value
+     * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
      */
     public function saveLinkType($value)
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it.');
+        });
         $this->linkType = $value;
     }
 
@@ -133,8 +168,14 @@ public function onBeforeWrite(): void
         parent::onBeforeWrite();
     }
 
+    /**
+     * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
+     */
     function setData($data): JsonData
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it.');
+        });
         if (is_string($data)) {
             $data = json_decode($data, true);
 
@@ -184,8 +225,14 @@ function setData($data): JsonData
         return $jsonData;
     }
 
+    /**
+     * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
+     */
     public function jsonSerialize(): mixed
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it.');
+        });
         $typeKey = Registry::singleton()->keyByClassName(static::class);
 
         if (!$typeKey) {
@@ -205,8 +252,14 @@ public function jsonSerialize(): mixed
         return $data;
     }
 
+    /**
+     * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
+     */
     public function loadLinkData(array $data): JsonData
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it.');
+        });
         $link = new static();
 
         foreach ($data as $key => $value) {
@@ -243,9 +296,13 @@ public function getURL(): string
      * Get all link types except the generic one
      *
      * @throws ReflectionException
+     * @deprecated 3.0.0 Will be removed in linkfield v4 which will use SilverStripe\LinkField\Services\LinkTypeService::generateAllLinkTypes() instead
      */
     private function getLinkTypes(): array
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed in linkfield v4 which will use SilverStripe\LinkField\Services\LinkTypeService::generateAllLinkTypes() instead.');
+        });
         $classes = ClassInfo::subclassesFor(self::class);
         $types = [];
 
diff --git a/src/Models/PhoneLink.php b/src/Models/PhoneLink.php
index 855e3b1c..4942e8ed 100644
--- a/src/Models/PhoneLink.php
+++ b/src/Models/PhoneLink.php
@@ -2,6 +2,8 @@
 
 namespace SilverStripe\LinkField\Models;
 
+use SilverStripe\Dev\Deprecation;
+
 /**
  * A link to a phone number
  *
@@ -15,8 +17,14 @@ class PhoneLink extends Link
         'Phone' => 'Varchar(255)',
     ];
 
+    /**
+     * @deprecated 3.0.0 Will be removed in linkfield v4 which will use getDescription() instead
+     */
     public function generateLinkDescription(array $data): string
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed in linkfield v4 which will use getDescription() instead');
+        });
         return isset($data['Phone']) ? $data['Phone'] : '';
     }
 
diff --git a/src/Models/SiteTreeLink.php b/src/Models/SiteTreeLink.php
index f3f611d8..c6faac51 100644
--- a/src/Models/SiteTreeLink.php
+++ b/src/Models/SiteTreeLink.php
@@ -8,6 +8,7 @@
 use SilverStripe\Forms\FieldList;
 use SilverStripe\Forms\TextField;
 use SilverStripe\Forms\TreeDropdownField;
+use SilverStripe\Dev\Deprecation;
 
 /**
  * A link to a Page in the CMS
@@ -30,8 +31,14 @@ class SiteTreeLink extends Link
         'Page' => SiteTree::class,
     ];
 
+    /**
+     * @deprecated 3.0.0 Will be removed in linkfield v4 which will use getDescription() instead
+     */
     public function generateLinkDescription(array $data): string
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed in linkfield v4 which will use getDescription() instead.');
+        });
         $pageId = $data['PageID'] ?? null;
 
         if (!$pageId) {
diff --git a/src/ORM/DBJson.php b/src/ORM/DBJson.php
index 9e6391b1..d05cd0f0 100644
--- a/src/ORM/DBJson.php
+++ b/src/ORM/DBJson.php
@@ -6,15 +6,20 @@
 use SilverStripe\LinkField\JsonData;
 use SilverStripe\ORM\DB;
 use SilverStripe\ORM\FieldType\DBField;
+use SilverStripe\Dev\Deprecation;
 
 /**
  * Represents a DBField storing a JSON string
+ *
+ * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
  */
 class DBJson extends DBField
 {
-
     public function __construct($name = null, $defaultVal = [])
     {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it', Deprecation::SCOPE_CLASS);
+        });
         $this->defaultVal = is_array($defaultVal) ? $defaultVal : [];
 
         parent::__construct($name);
diff --git a/src/ORM/DBLink.php b/src/ORM/DBLink.php
index a5889434..baa88f13 100644
--- a/src/ORM/DBLink.php
+++ b/src/ORM/DBLink.php
@@ -5,12 +5,23 @@
 use SilverStripe\LinkField\Type\Registry;
 use SilverStripe\ORM\FieldType\DBHTMLText;
 use SilverStripe\LinkField\Form\LinkField;
+use SilverStripe\Dev\Deprecation;
 
 /**
  * Represent Link object stored as a JSON string
+ *
+ * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
  */
 class DBLink extends DBJson
 {
+    public function __construct($name = null, $defaultVal = [])
+    {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed without equivalent functionality to replace it', Deprecation::SCOPE_CLASS);
+        });
+        parent::__construct($name, $defaultVal);
+    }
+
     /**
      * Load the link data into a singleton Link Object
      *
diff --git a/src/Type/Registry.php b/src/Type/Registry.php
index 152138ea..7c85b86f 100644
--- a/src/Type/Registry.php
+++ b/src/Type/Registry.php
@@ -8,9 +8,12 @@
 use SilverStripe\Core\Extensible;
 use SilverStripe\Core\Injector\Injectable;
 use SilverStripe\Core\Injector\Injector;
+use SilverStripe\Dev\Deprecation;
 
 /**
  * Manage the list of known link types
+ *
+ * @deprecated 3.0.0 Will be removed in linkfield v4 which will use SilverStripe\LinkField\Services\LinkTypeService instead
  */
 class Registry
 {
@@ -18,6 +21,13 @@ class Registry
     use Extensible;
     use Injectable;
 
+    public function __construct()
+    {
+        Deprecation::withNoReplacement(function () {
+            Deprecation::notice('3.0.0', 'Will be removed in linkfield v4 which will use SilverStripe\LinkField\Services\LinkTypeService instead.', Deprecation::SCOPE_CLASS);
+        });
+    }
+
     private static $types = [];
 
     /**
diff --git a/src/Type/Type.php b/src/Type/Type.php
index 1d0cb428..9a29d161 100644
--- a/src/Type/Type.php
+++ b/src/Type/Type.php
@@ -7,6 +7,8 @@
 
 /**
  * Define a link type that can be edited in Link Field
+ *
+ * @deprecated 3.0.0 Will be removed without equivalent functionality to replace it
  */
 interface Type
 {