diff --git a/pkg/processors/add_property.go b/pkg/processors/add_property.go
new file mode 100644
index 0000000..6bf26c8
--- /dev/null
+++ b/pkg/processors/add_property.go
@@ -0,0 +1,52 @@
+package processors
+
+import (
+	"github.com/akamensky/argparse"
+	"github.com/emersion/go-ical"
+	"strings"
+)
+
+type AddPropertyProcessor struct {
+	propertyName  *string
+	propertyValue *string
+	overwrite     *bool
+	toolbox       Toolbox
+}
+
+func (a *AddPropertyProcessor) Initialize(parser *argparse.Parser) (*argparse.Command, error) {
+	c := parser.NewCommand("addProperty", "Adds a new property to each selected event")
+	a.propertyName = c.String("N", "name", &argparse.Options{
+		Help:     "Name of the new property",
+		Required: true,
+	})
+	a.propertyValue = c.String("V", "value", &argparse.Options{
+		Help:     "Value of the new property (only text values allowed)",
+		Required: true,
+	})
+	a.overwrite = c.Flag("O", "overwrite", &argparse.Options{
+		Help:     "Overwrite property if it exists",
+		Required: false,
+		Default:  true,
+	})
+	return c, nil
+}
+
+func (a *AddPropertyProcessor) SetToolbox(toolbox Toolbox) {
+	a.toolbox = toolbox
+}
+
+func (a *AddPropertyProcessor) Process(input ical.Calendar, output *ical.Calendar) error {
+	n := strings.ToUpper(*a.propertyName)
+	for _, event := range input.Events() {
+		if a.toolbox.EventMatchesSelector(event) {
+			if event.Props.Get(n) != nil && *a.overwrite {
+				event.Props.Del(n)
+			}
+			if event.Props.Get(n) == nil {
+				event.Props.SetText(n, *a.propertyValue)
+			}
+		}
+		output.Children = append(output.Children, event.Component)
+	}
+	return nil
+}
diff --git a/pkg/processors/add_property_test.go b/pkg/processors/add_property_test.go
new file mode 100644
index 0000000..1ee3f24
--- /dev/null
+++ b/pkg/processors/add_property_test.go
@@ -0,0 +1,64 @@
+package processors
+
+import (
+	"github.com/emersion/go-ical"
+	"github.com/stretchr/testify/assert"
+	"icarus/internal"
+	"testing"
+)
+
+func TestAddPropertyProcessor_Process(t *testing.T) {
+	event1 := ical.NewEvent()
+	event1.Props.SetText(ical.PropSummary, "test")
+	input := ical.NewCalendar()
+	input.Children = append(input.Children, event1.Component)
+	subject := AddPropertyProcessor{}
+	subject.SetToolbox(NewToolbox())
+	subject.propertyName = internal.StringAddr("X-TEST")
+	subject.propertyValue = internal.StringAddr("test")
+	subject.overwrite = internal.BoolAddr(false)
+	output := ical.NewCalendar()
+	err := subject.Process(*input, output)
+	assert.NoError(t, err, "Process got an error")
+	assert.Len(t, output.Children, 1, "Invalid number of events")
+	assert.NotNil(t, output.Children[0].Props.Get("X-TEST"), "Test property does not exists")
+	assert.Equal(t, "test", output.Children[0].Props.Get("X-TEST").Value, "Test property has wrong value")
+}
+
+func TestAddPropertyProcessor_NotOverwrite(t *testing.T) {
+	event1 := ical.NewEvent()
+	event1.Props.SetText(ical.PropSummary, "test")
+	event1.Props.SetText("X-TEST", "test")
+	input := ical.NewCalendar()
+	input.Children = append(input.Children, event1.Component)
+	subject := AddPropertyProcessor{}
+	subject.SetToolbox(NewToolbox())
+	subject.propertyName = internal.StringAddr("X-TEST")
+	subject.propertyValue = internal.StringAddr("test2")
+	subject.overwrite = internal.BoolAddr(false)
+	output := ical.NewCalendar()
+	err := subject.Process(*input, output)
+	assert.NoError(t, err, "Process got an error")
+	assert.Len(t, output.Children, 1, "Invalid number of events")
+	assert.NotNil(t, output.Children[0].Props.Get("X-TEST"), "Test property does not exists")
+	assert.Equal(t, "test", output.Children[0].Props.Get("X-TEST").Value, "Test property has wrong value")
+}
+
+func TestAddPropertyProcessor_Overwrite(t *testing.T) {
+	event1 := ical.NewEvent()
+	event1.Props.SetText(ical.PropSummary, "test")
+	event1.Props.SetText("X-TEST", "test")
+	input := ical.NewCalendar()
+	input.Children = append(input.Children, event1.Component)
+	subject := AddPropertyProcessor{}
+	subject.SetToolbox(NewToolbox())
+	subject.propertyName = internal.StringAddr("X-TEST")
+	subject.propertyValue = internal.StringAddr("test2")
+	subject.overwrite = internal.BoolAddr(true)
+	output := ical.NewCalendar()
+	err := subject.Process(*input, output)
+	assert.NoError(t, err, "Process got an error")
+	assert.Len(t, output.Children, 1, "Invalid number of events")
+	assert.NotNil(t, output.Children[0].Props.Get("X-TEST"), "Test property does not exists")
+	assert.Equal(t, "test2", output.Children[0].Props.Get("X-TEST").Value, "Test property has wrong value")
+}
diff --git a/pkg/processors/delete_property.go b/pkg/processors/delete_property.go
new file mode 100644
index 0000000..617d013
--- /dev/null
+++ b/pkg/processors/delete_property.go
@@ -0,0 +1,37 @@
+package processors
+
+import (
+	"github.com/akamensky/argparse"
+	"github.com/emersion/go-ical"
+	"strings"
+)
+
+type DeletePropertyProcessor struct {
+	propertyName *string
+	toolbox      Toolbox
+}
+
+func (d *DeletePropertyProcessor) Initialize(parser *argparse.Parser) (*argparse.Command, error) {
+	c := parser.NewCommand("deleteProperty", "Deletes a property from all selected events")
+	d.propertyName = c.String("P", "property", &argparse.Options{
+		Help:     "Property to delete (e.g. X-SPECIAL-PROP, CATEGORIES)",
+		Required: true,
+	})
+	return c, nil
+}
+
+func (d *DeletePropertyProcessor) SetToolbox(toolbox Toolbox) {
+	d.toolbox = toolbox
+}
+
+func (d *DeletePropertyProcessor) Process(input ical.Calendar, output *ical.Calendar) error {
+	for _, event := range input.Events() {
+		if d.toolbox.EventMatchesSelector(event) {
+			if event.Props.Get(strings.ToUpper(*d.propertyName)) != nil {
+				event.Props.Del(strings.ToUpper(*d.propertyName))
+			}
+		}
+		output.Children = append(output.Children, event.Component)
+	}
+	return nil
+}
diff --git a/pkg/processors/delete_property_test.go b/pkg/processors/delete_property_test.go
new file mode 100644
index 0000000..e3d3389
--- /dev/null
+++ b/pkg/processors/delete_property_test.go
@@ -0,0 +1,25 @@
+package processors
+
+import (
+	"github.com/emersion/go-ical"
+	"github.com/stretchr/testify/assert"
+	"icarus/internal"
+	"testing"
+)
+
+func TestDeleteFieldProcessor_Process(t *testing.T) {
+	event1 := ical.NewEvent()
+	event1.Props.SetText(ical.PropSummary, "test")
+	event1.Props.SetText("X-TEST", "test")
+	assert.NotNil(t, event1.Props.Get("X-TEST"), "Test property was not set")
+	input := ical.NewCalendar()
+	input.Children = append(input.Children, event1.Component)
+	subject := DeletePropertyProcessor{}
+	subject.SetToolbox(NewToolbox())
+	subject.propertyName = internal.StringAddr("X-TEST")
+	output := ical.NewCalendar()
+	err := subject.Process(*input, output)
+	assert.NoError(t, err, "Process got an error")
+	assert.Len(t, output.Children, 1, "Invalid number of events")
+	assert.Nil(t, output.Children[0].Props.Get("X-TEST"), "Test property still exists")
+}
diff --git a/pkg/processors/processors.go b/pkg/processors/processors.go
index 7a03224..04ff0c2 100644
--- a/pkg/processors/processors.go
+++ b/pkg/processors/processors.go
@@ -22,5 +22,7 @@ func GetProcessors() []BaseProcessor {
 		&ConvertAllDayProcessor{},
 		&AddDTStampProcessor{},
 		&AddAlarmProcessor{},
+		&AddPropertyProcessor{},
+		&DeletePropertyProcessor{},
 	}
 }