diff --git a/app/src/main/java/com/keylesspalace/tusky/util/MediaUtils.java b/app/src/main/java/com/keylesspalace/tusky/util/MediaUtils.java
new file mode 100644
index 00000000..76d18bde
--- /dev/null
+++ b/app/src/main/java/com/keylesspalace/tusky/util/MediaUtils.java
@@ -0,0 +1,117 @@
+package com.keylesspalace.tusky.util;
+
+import android.content.ContentResolver;
+import android.content.Context;
+import android.database.Cursor;
+import android.graphics.Bitmap;
+import android.graphics.drawable.Drawable;
+import android.net.Uri;
+import android.os.Environment;
+import android.provider.OpenableColumns;
+import android.support.annotation.Nullable;
+import android.support.v4.content.FileProvider;
+
+import com.squareup.picasso.Picasso;
+import com.squareup.picasso.Target;
+
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * Class who will have all the code link with Media
+ * <p>
+ * Motivation : try to keep the ComposeActivity "smaller" and make modular method
+ */
+public class MediaUtils {
+    public static final int MEDIA_SIZE_UNKNOWN = -1;
+
+    @Nullable
+    public static byte[] inputStreamGetBytes(InputStream stream) {
+        ByteArrayOutputStream buffer = new ByteArrayOutputStream();
+        int read;
+        byte[] data = new byte[16384];
+        try {
+            while ((read = stream.read(data, 0, data.length)) != -1) {
+                buffer.write(data, 0, read);
+            }
+            buffer.flush();
+        } catch (IOException e) {
+            return null;
+        }
+        return buffer.toByteArray();
+    }
+
+    public static long getMediaSize(ContentResolver contentResolver, Uri uri) {
+        long mediaSize;
+        Cursor cursor = contentResolver.query(uri, null, null, null, null);
+        if (cursor != null) {
+            int sizeIndex = cursor.getColumnIndex(OpenableColumns.SIZE);
+            cursor.moveToFirst();
+            mediaSize = cursor.getLong(sizeIndex);
+            cursor.close();
+        } else {
+            mediaSize = MEDIA_SIZE_UNKNOWN;
+        }
+        return mediaSize;
+    }
+
+    // Download an image with picasso
+    public static Target picassoImageTarget(final Context context, final MediaListener mediaListener) {
+        final String imageName = "temp";
+        return new Target() {
+            @Override
+            public void onBitmapLoaded(final Bitmap bitmap, Picasso.LoadedFrom from) {
+                new Thread(new Runnable() {
+                    @Override
+                    public void run() {
+                        FileOutputStream fos = null;
+                        Uri uriForFile;
+                        try {
+                            // we download only a "temp" file
+                            File storageDir = context.getExternalFilesDir(Environment.DIRECTORY_PICTURES);
+                            File tempFile = File.createTempFile(
+                                    imageName,
+                                    ".jpg",
+                                    storageDir
+                            );
+
+                            fos = new FileOutputStream(tempFile);
+                            bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
+                            uriForFile = FileProvider.getUriForFile(context,
+                                    "com.keylesspalace.tusky.fileprovider",
+                                    tempFile);
+
+                            // giving to the activity the URI callback
+                            mediaListener.onCallback(uriForFile);
+                        } catch (IOException e) {
+                            e.printStackTrace();
+                        } finally {
+                            try {
+                                if (fos != null) {
+                                    fos.close();
+                                }
+                            } catch (IOException e) {
+                                e.printStackTrace();
+                            }
+                        }
+                    }
+                }).start();
+            }
+
+            @Override
+            public void onBitmapFailed(Drawable errorDrawable) {
+            }
+
+            @Override
+            public void onPrepareLoad(Drawable placeHolderDrawable) {
+            }
+        };
+    }
+
+    public interface MediaListener {
+        void onCallback(Uri headerInfo);
+    }
+}