diff --git a/graph2/resolvers/log.go b/graph2/resolvers/log.go
index 5abbd12..2e73ce7 100644
--- a/graph2/resolvers/log.go
+++ b/graph2/resolvers/log.go
@@ -58,6 +58,10 @@ func (r *mutationResolver) ImportLog(ctx context.Context, input graphcore.LogImp
 	return r.s.Logs.Import(ctx, input.Importer, date, tz, input.ChannelName, input.Data)
 }
 
+func (r *mutationResolver) SplitLog(ctx context.Context, input graphcore.LogSplitInput) (*models.Log, error) {
+	return r.s.Logs.SplitLog(ctx, input.LogID, input.StartPostID)
+}
+
 func (r *mutationResolver) EditLog(ctx context.Context, input graphcore.LogEditInput) (*models.Log, error) {
 	update := models.LogUpdate{
 		Open:        input.Open,
diff --git a/graph2/schema/root.gql b/graph2/schema/root.gql
index 5e9a03b..ef79997 100644
--- a/graph2/schema/root.gql
+++ b/graph2/schema/root.gql
@@ -117,6 +117,9 @@ type Mutation {
   # Import a log
   importLog(input: LogImportInput!): [Log!]!
 
+  # Split a log
+  splitLog(input: LogSplitInput!): Log!
+
   # Edit a log
   editLog(input: LogEditInput!): Log!
 
diff --git a/graph2/schema/types/Log.gql b/graph2/schema/types/Log.gql
index 0d5a89d..c476d2a 100644
--- a/graph2/schema/types/Log.gql
+++ b/graph2/schema/types/Log.gql
@@ -122,6 +122,17 @@ input LogImportInput {
   data: String!
 }
 
+"""
+Input for splitLog mutation.
+"""
+input LogSplitInput {
+  "Log ID"
+  logId: String!
+
+  "After Post ID"
+  startPostId: String!
+}
+
 enum LogImporter {
   """
   mIRC-like: This importer parses logs that copied from mIRC posts without spaces.
diff --git a/services/logs.go b/services/logs.go
index 492959f..2c3fbf9 100644
--- a/services/logs.go
+++ b/services/logs.go
@@ -203,6 +203,89 @@ func (s *LogService) Update(ctx context.Context, id string, update models.LogUpd
 	return log, nil
 }
 
+func (s *LogService) SplitLog(ctx context.Context, logId string, startPostId string) (*models.Log, error) {
+	// Find log
+	l, err := s.logs.Find(ctx, logId)
+	if err != nil {
+		return nil, err
+	}
+	if err := auth.CheckPermission(ctx, "add", l); err != nil {
+		return nil, err
+	}
+
+	// Find posts
+	posts, err := s.ListPosts(ctx, &models.PostFilter{LogID: &l.ShortID})
+	if err != nil {
+		return nil, err
+	}
+	if len(posts) == 0 {
+		return nil, errors.New("cannot split empty log")
+	}
+
+	// Cut the posts slice.
+	firstPost := posts[0]
+	cutPosts := posts[len(posts):]
+	for i, post := range posts {
+		if post.ID == startPostId {
+			cutPosts = posts[i:]
+			firstPost = post
+			break
+		}
+	}
+	if len(cutPosts) == 0 {
+		return nil, errors.New("post not found")
+	}
+	if len(cutPosts) == len(posts) || firstPost.Time.Equal(l.Date) {
+		return nil, errors.New("cannot move posts")
+	}
+
+	// Create a new log
+	newLog := &models.Log{
+		Date:        firstPost.Time,
+		ChannelName: l.ChannelName,
+		EventName:   l.EventName,
+	}
+	newLog, err = s.logs.Insert(ctx, *newLog)
+	if err != nil {
+		return nil, err
+	}
+
+	// Put the cut posts in the new log
+	newPosts := make([]*models.Post, 0, len(cutPosts))
+	for _, post := range cutPosts {
+		postCopy := *post
+		postCopy.ID = ""
+		postCopy.LogID = newLog.ShortID
+
+		newPost, err := s.posts.Insert(ctx, postCopy)
+		if err != nil {
+			_ = s.logs.Delete(ctx, *newLog)
+			return nil, err
+		}
+
+		newPosts = append(newPosts, newPost)
+	}
+
+	// Remove the posts from the old log (this can't error because that'll make a mess)
+	for _, post := range cutPosts {
+		err := s.posts.Delete(ctx, *post)
+		if err != nil {
+			log.Printf("Failed to delete post %s: %s", post.ID, err)
+		}
+	}
+
+	// Submit the changes
+	s.changeService.Submit(ctx, models.ChangeModelPost, "remove", true, changekeys.Many(l, cutPosts), cutPosts)
+	s.changeService.Submit(ctx, models.ChangeModelLog, "add", true, changekeys.Listed(newLog), newLog)
+	s.changeService.Submit(ctx, models.ChangeModelPost, "add", true, changekeys.Many(newLog, newPosts), newPosts)
+
+	// Refresh character lists.
+	_ = s.refreshLogCharacters(ctx, *l, nil)
+	_ = s.refreshLogCharacters(ctx, *newLog, nil)
+
+	return newLog, nil
+}
+
 func (s *LogService) AddPost(ctx context.Context, logId string, time time.Time, kind, nick, text string) (*models.Post, error) {
 	if kind == "" || nick == "" || time.IsZero() {
 		return nil, errors.New("kind, nick and time must be non-empty")