diff --git a/assets/js/controllers/postedit.js b/assets/js/controllers/postedit.js
index 54679c5..71328e3 100644
--- a/assets/js/controllers/postedit.js
+++ b/assets/js/controllers/postedit.js
@@ -14,11 +14,16 @@ export default class PosteditController extends Controller {
     async save(ev) {
         ev.preventDefault();
 
+        showToast({
+            title: "💾 Saving Post",
+            body: (this.saveActionValue === "Save Draft") ? "Saving post as draft…" : "Updating post…",
+        });
+
         try {
             await this._postForm(this.saveActionValue);
 
             showToast({
-                title: "💾 Post Saved",
+                title: "💾 Saving Post",
                 body: (this.saveActionValue === "Save Draft") ? "Post saved as draft." : "Post updated.",
             });
         } catch (e) {
diff --git a/providers/sitebuilder/builder.go b/providers/sitebuilder/builder.go
index 9b25fb1..4908d61 100644
--- a/providers/sitebuilder/builder.go
+++ b/providers/sitebuilder/builder.go
@@ -12,6 +12,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/PuerkitoBio/goquery"
 	"github.com/gopherlibs/feedhub/feedhub"
 	"golang.org/x/sync/errgroup"
 	"lmika.dev/lmika/weiro/models"
@@ -20,10 +21,11 @@ import (
 )
 
 type Builder struct {
-	site       pubmodel.Site
-	mdRenderer *markdown.Renderer
-	opts       Options
-	tmpls      *template.Template
+	site             pubmodel.Site
+	mdRenderer       *markdown.Renderer
+	opts             Options
+	tmpls            *template.Template
+	postMDProcessors []postMDProcessor
 }
 
 func New(site pubmodel.Site, opts Options) (*Builder, error) {
@@ -39,6 +41,9 @@ func New(site pubmodel.Site, opts Options) (*Builder, error) {
 		opts:       opts,
 		tmpls:      tmpls,
 		mdRenderer: markdown.NewRendererForSite(),
+		postMDProcessors: []postMDProcessor{
+			uploadAbsoluteURL,
+		},
 	}, nil
 }
 
@@ -207,6 +212,26 @@ func (b *Builder) renderPost(post *models.Post) (postSingleData, error) {
 		return postSingleData{}, fmt.Errorf("failed to write post %s: %w", post.Slug, err)
 	}
 
+	if len(b.postMDProcessors) > 0 {
+		dom, err := goquery.NewDocumentFromReader(&md)
+		if err != nil {
+			return postSingleData{}, fmt.Errorf("failed to parse post %s: %w", post.Slug, err)
+		}
+
+		for _, processor := range b.postMDProcessors {
+			if err := processor(b.site, dom); err != nil {
+				return postSingleData{}, fmt.Errorf("failed to process post %s: %w", post.Slug, err)
+			}
+		}
+
+		outHTML, err := dom.Find("body").Html()
+		if err != nil {
+			return postSingleData{}, fmt.Errorf("failed to render post %s: %w", post.Slug, err)
+		}
+		md.Reset()
+		md.WriteString(outHTML)
+	}
+
 	postURL := strings.TrimSuffix(b.site.BaseURL, "/") + "/" + strings.TrimPrefix(postPath, "/")
 
 	return postSingleData{
diff --git a/providers/sitebuilder/processors.go b/providers/sitebuilder/processors.go
new file mode 100644
index 0000000..c699160
--- /dev/null
+++ b/providers/sitebuilder/processors.go
@@ -0,0 +1,37 @@
+package sitebuilder
+
+import (
+	"net/url"
+	"strings"
+
+	"github.com/PuerkitoBio/goquery"
+	"lmika.dev/lmika/weiro/models/pubmodel"
+)
+
+type postMDProcessor func(site pubmodel.Site, dom *goquery.Document) error
+
+func uploadAbsoluteURL(site pubmodel.Site, dom *goquery.Document) error {
+	siteURL, err := url.Parse(site.BaseURL)
+	if err != nil {
+		return err
+	}
+
+	dom.Find("img").Each(func(i int, s *goquery.Selection) {
+		srcUrl := s.AttrOr("src", "")
+		if site.BaseURL == "" {
+			return
+		} else if strings.HasPrefix(srcUrl, "http:") || strings.HasPrefix(srcUrl, "https:") {
+			return
+		}
+
+		pu, err := url.Parse(srcUrl)
+		if err != nil {
+			return
+		}
+
+		absURL := siteURL.ResolveReference(pu)
+
+		s.SetAttr("src", absURL.String())
+	})
+	return nil
+}
diff --git a/providers/sitebuilder/tmplfns.go b/providers/sitebuilder/tmplfns.go
index 4b69a57..c6adc58 100644
--- a/providers/sitebuilder/tmplfns.go
+++ b/providers/sitebuilder/tmplfns.go
@@ -3,7 +3,7 @@ package sitebuilder
 import (
 	"html/template"
 	"net/url"
-	"path/filepath"
+	"strings"
 	"time"
 
 	"lmika.dev/lmika/weiro/models/pubmodel"
@@ -20,7 +20,7 @@ func templateFns(site pubmodel.Site, opts Options) template.FuncMap {
 			if err != nil {
 				return "", err
 			}
-			pu.Path = filepath.Join(pu.Path, basePath)
+			pu.Path = joinPath(pu.Path, basePath)
 			return pu.String(), nil
 		},
 		"format_date": func(date time.Time) string {
@@ -32,3 +32,7 @@ func templateFns(site pubmodel.Site, opts Options) template.FuncMap {
 		},
 	}
 }
+
+func joinPath(basePath, path string) string {
+	return strings.TrimSuffix(basePath, "/") + "/" + strings.TrimPrefix(path, "/")
+}