diff --git a/api/onnx_web/chain/__init__.py b/api/onnx_web/chain/__init__.py
index 0312d85e..5aa56c56 100644
--- a/api/onnx_web/chain/__init__.py
+++ b/api/onnx_web/chain/__init__.py
@@ -1,6 +1,7 @@
 from .base import ChainPipeline, PipelineStage, StageCallback, StageParams
 from .blend_img2img import blend_img2img
 from .blend_inpaint import blend_inpaint
+from .blend_mask import blend_mask
 from .correct_codeformer import correct_codeformer
 from .correct_gfpgan import correct_gfpgan
 from .persist_disk import persist_disk
diff --git a/api/onnx_web/chain/blend_img2img.py b/api/onnx_web/chain/blend_img2img.py
index 3257ffc5..b101125c 100644
--- a/api/onnx_web/chain/blend_img2img.py
+++ b/api/onnx_web/chain/blend_img2img.py
@@ -27,7 +27,7 @@ def blend_img2img(
     **kwargs,
 ) -> Image.Image:
     prompt = prompt or params.prompt
-    logger.info("generating image using img2img, %s steps: %s", params.steps, prompt)
+    logger.info("blending image using img2img, %s steps: %s", params.steps, prompt)
 
     pipe = load_pipeline(
         OnnxStableDiffusionImg2ImgPipeline,
diff --git a/api/onnx_web/chain/blend_inpaint.py b/api/onnx_web/chain/blend_inpaint.py
index b828fac9..114f095a 100644
--- a/api/onnx_web/chain/blend_inpaint.py
+++ b/api/onnx_web/chain/blend_inpaint.py
@@ -32,7 +32,9 @@ def blend_inpaint(
     callback: ProgressCallback = None,
     **kwargs,
 ) -> Image.Image:
-    logger.info("upscaling image by expanding borders", expand)
+    logger.info(
+        "blending image using inpaint, %s steps: %s", params.steps, params.prompt
+    )
 
     if mask_image is None:
         # if no mask was provided, keep the full source image
diff --git a/api/onnx_web/chain/blend_mask.py b/api/onnx_web/chain/blend_mask.py
new file mode 100644
index 00000000..b8f0d390
--- /dev/null
+++ b/api/onnx_web/chain/blend_mask.py
@@ -0,0 +1,36 @@
+from logging import getLogger
+from typing import List, Optional
+
+from PIL import Image
+
+from onnx_web.output import save_image
+
+from ..device_pool import JobContext, ProgressCallback
+from ..params import ImageParams, StageParams
+from ..utils import ServerContext, is_debug
+
+logger = getLogger(__name__)
+
+
+def blend_mask(
+    _job: JobContext,
+    server: ServerContext,
+    _stage: StageParams,
+    _params: ImageParams,
+    *,
+    sources: Optional[List[Image.Image]] = None,
+    mask: Optional[Image.Image] = None,
+    _callback: ProgressCallback = None,
+    **kwargs,
+) -> Image.Image:
+    logger.info("blending image using mask")
+
+    l_mask = Image.new("RGBA", mask.size, color="black")
+    l_mask.alpha_composite(mask)
+    l_mask = l_mask.convert("L")
+
+    if is_debug():
+        save_image(server, "last-mask.png", mask)
+        save_image(server, "last-mask-l.png", l_mask)
+
+    return Image.composite(sources[0], sources[1], l_mask)
diff --git a/api/onnx_web/diffusion/run.py b/api/onnx_web/diffusion/run.py
index 2b776b9c..e86ec9c4 100644
--- a/api/onnx_web/diffusion/run.py
+++ b/api/onnx_web/diffusion/run.py
@@ -1,11 +1,12 @@
 from logging import getLogger
-from typing import Any
+from typing import Any, List
 
 import numpy as np
 import torch
 from diffusers import OnnxStableDiffusionImg2ImgPipeline, OnnxStableDiffusionPipeline
 from PIL import Image, ImageChops
 
+from onnx_web.chain import blend_mask
 from onnx_web.chain.base import ChainProgress
 
 from ..chain import upscale_outpaint
@@ -231,3 +232,39 @@ def run_upscale_pipeline(
     run_gc()
 
     logger.info("finished upscale job: %s", dest)
+
+
+def run_blend_pipeline(
+    job: JobContext,
+    server: ServerContext,
+    params: ImageParams,
+    size: Size,
+    output: str,
+    upscale: UpscaleParams,
+    sources: List[Image.Image],
+    mask: Image.Image,
+) -> None:
+    progress = job.get_progress_callback()
+    stage = StageParams()
+
+    image = blend_mask(
+        job,
+        server,
+        stage,
+        params,
+        sources=sources,
+        mask=mask,
+        callback=progress,
+    )
+
+    image = run_upscale_correction(
+        job, server, stage, params, image, upscale=upscale, callback=progress
+    )
+
+    dest = save_image(server, output, image)
+    save_params(server, output, params, size, upscale=upscale)
+
+    del image
+    run_gc()
+
+    logger.info("finished blend job: %s", dest)
diff --git a/api/onnx_web/serve.py b/api/onnx_web/serve.py
index c92b7629..12e9046d 100644
--- a/api/onnx_web/serve.py
+++ b/api/onnx_web/serve.py
@@ -34,6 +34,7 @@ from .chain import (
 from .device_pool import DevicePoolExecutor
 from .diffusion.load import pipeline_schedulers
 from .diffusion.run import (
+    run_blend_pipeline,
     run_img2img_pipeline,
     run_inpaint_pipeline,
     run_txt2img_pipeline,
@@ -735,6 +736,42 @@ def chain():
     return jsonify(json_params(output, params, size))
 
 
+@app.route("/api/blend", methods=["POST"])
+def blend():
+    if "mask" not in request.files:
+        return error_reply("mask image is required")
+
+    mask_file = request.files.get("mask")
+    mask = Image.open(BytesIO(mask_file.read())).convert("RGBA")
+
+    source_file = request.files.get("source:0")
+    source_0 = Image.open(BytesIO(source_file.read())).convert("RGBA")
+
+    source_file = request.files.get("source:1")
+    source_1 = Image.open(BytesIO(source_file.read())).convert("RGBA")
+
+    device, params, size = pipeline_from_request()
+    upscale = upscale_from_request()
+
+    output = make_output_name(context, "upscale", params, size)
+    logger.info("upscale job queued for: %s", output)
+
+    executor.submit(
+        output,
+        run_blend_pipeline,
+        context,
+        params,
+        size,
+        output,
+        upscale,
+        [source_0, source_1],
+        mask,
+        needs_device=device,
+    )
+
+    return jsonify(json_params(output, params, size))
+
+
 @app.route("/api/cancel", methods=["PUT"])
 def cancel():
     output_file = request.args.get("output", None)
diff --git a/gui/src/client.ts b/gui/src/client.ts
index a8198c94..a0a69645 100644
--- a/gui/src/client.ts
+++ b/gui/src/client.ts
@@ -2,6 +2,7 @@
 import { doesExist } from '@apextoaster/js-utils';
 
 import { ServerParams } from './config.js';
+import { range } from './utils.js';
 
 /**
  * Shared parameters for anything using models, which is pretty much everything.
@@ -482,7 +483,26 @@ export function makeClient(root: string, f = fetch): ApiClient {
       });
     },
     async blend(model: ModelParams, params: BlendParams, upscale: UpscaleParams): Promise<ImageResponse> {
-      throw new Error('TODO');
+      const url = makeApiUrl(root, 'blend');
+      appendModelToURL(url, model);
+
+      if (doesExist(upscale)) {
+        appendUpscaleToURL(url, upscale);
+      }
+
+      const body = new FormData();
+      body.append('mask', params.mask, 'mask');
+
+      for (const i of range(params.sources.length)) {
+        const name = `source:${i.toFixed(0)}`;
+        body.append(name, params.sources[i], name);
+      }
+
+      // eslint-disable-next-line no-return-await
+      return await throttleRequest(url, {
+        body,
+        method: 'POST',
+      });
     },
     async ready(params: ImageResponse): Promise<ReadyResponse> {
       const path = makeApiUrl(root, 'ready');
diff --git a/gui/src/components/ImageCard.tsx b/gui/src/components/ImageCard.tsx
index ec9feaa9..7bbcfe4e 100644
--- a/gui/src/components/ImageCard.tsx
+++ b/gui/src/components/ImageCard.tsx
@@ -1,14 +1,15 @@
-import { doesExist, mustDefault, mustExist } from '@apextoaster/js-utils';
-import { Blender, Brush, ContentCopy, CropFree, Delete, Download, ZoomOutMap } from '@mui/icons-material';
-import { Box, Card, CardContent, CardMedia, Grid, IconButton, Paper, Tooltip } from '@mui/material';
+import { doesExist, Maybe, mustDefault, mustExist } from '@apextoaster/js-utils';
+import { Blender, Brush, ContentCopy, Delete, Download, ZoomOutMap } from '@mui/icons-material';
+import { Box, Card, CardContent, CardMedia, Grid, IconButton, Menu, MenuItem, Paper, Tooltip } from '@mui/material';
 import * as React from 'react';
-import { useContext } from 'react';
+import { useContext, useState } from 'react';
 import { useHash } from 'react-use/lib/useHash';
 import { useStore } from 'zustand';
 
 import { ImageResponse } from '../client.js';
-import { ConfigContext, StateContext } from '../state.js';
+import { BLEND_SOURCES, ConfigContext, StateContext } from '../state.js';
 import { MODEL_LABELS, SCHEDULER_LABELS } from '../strings.js';
+import { range, visibleIndex } from '../utils.js';
 
 export interface ImageCardProps {
   value: ImageResponse;
@@ -27,6 +28,8 @@ export function ImageCard(props: ImageCardProps) {
   const { params, output, size } = value;
 
   const [_hash, setHash] = useHash();
+  const [anchor, setAnchor] = useState<Maybe<HTMLElement>>();
+
   const config = mustExist(useContext(ConfigContext));
   const state = mustExist(useContext(StateContext));
   // eslint-disable-next-line @typescript-eslint/unbound-method
@@ -67,11 +70,13 @@ export function ImageCard(props: ImageCardProps) {
     setHash('upscale');
   }
 
-  async function copySourceToBlend() {
+  async function copySourceToBlend(idx: number) {
     const blob = await loadSource();
-    // TODO: push instead
+    const sources = mustDefault(state.getState().blend.sources, []);
+    const newSources = [...sources];
+    newSources[idx] = blob;
     setBlend({
-      sources: [blob],
+      sources: newSources,
     });
     setHash('blend');
   }
@@ -86,6 +91,10 @@ export function ImageCard(props: ImageCardProps) {
     window.open(output.url, '_blank');
   }
 
+  function close() {
+    setAnchor(undefined);
+  }
+
   const model = mustDefault(MODEL_LABELS[params.model], params.model);
   const scheduler = mustDefault(SCHEDULER_LABELS[params.scheduler], params.scheduler);
 
@@ -137,10 +146,24 @@ export function ImageCard(props: ImageCardProps) {
           </GridItem>
           <GridItem xs={2}>
             <Tooltip title='Blend'>
-              <IconButton onClick={copySourceToBlend}>
+              <IconButton onClick={(event) => {
+                setAnchor(event.currentTarget);
+              }}>
                 <Blender />
               </IconButton>
             </Tooltip>
+            <Menu
+              anchorEl={anchor}
+              open={doesExist(anchor)}
+              onClose={close}
+            >
+              {range(BLEND_SOURCES).map((idx) => <MenuItem key={idx} onClick={() => {
+                copySourceToBlend(idx).catch((err) => {
+                  // TODO
+                });
+                close();
+              }}>{visibleIndex(idx)}</MenuItem>)}
+            </Menu>
           </GridItem>
           <GridItem xs={2}>
             <Tooltip title='Delete'>
diff --git a/gui/src/components/control/ImageControl.tsx b/gui/src/components/control/ImageControl.tsx
index 6420cfba..a01a16f8 100644
--- a/gui/src/components/control/ImageControl.tsx
+++ b/gui/src/components/control/ImageControl.tsx
@@ -22,7 +22,7 @@ export interface ImageControlProps {
 }
 
 /**
- * doesn't need to use state, the parent component knows which params to pass
+ * Doesn't need to use state directly, the parent component knows which params to pass
  */
 export function ImageControl(props: ImageControlProps) {
   const { params } = mustExist(useContext(ConfigContext));
diff --git a/gui/src/components/input/MaskCanvas.tsx b/gui/src/components/input/MaskCanvas.tsx
index 5f3aeb19..381a1759 100644
--- a/gui/src/components/input/MaskCanvas.tsx
+++ b/gui/src/components/input/MaskCanvas.tsx
@@ -1,13 +1,12 @@
 import { doesExist, Maybe, mustExist } from '@apextoaster/js-utils';
 import { FormatColorFill, Gradient, InvertColors, Undo } from '@mui/icons-material';
 import { Button, Stack, Typography } from '@mui/material';
-import { createLogger } from 'browser-bunyan';
 import { throttle } from 'lodash';
 import React, { RefObject, useContext, useEffect, useMemo, useRef } from 'react';
 import { useStore } from 'zustand';
 
 import { SAVE_TIME } from '../../config.js';
-import { ConfigContext, StateContext } from '../../state.js';
+import { ConfigContext, LoggerContext, StateContext } from '../../state.js';
 import { imageFromBlob } from '../../utils.js';
 import { NumericField } from './NumericField';
 
@@ -42,11 +41,10 @@ export interface MaskCanvasProps {
   onSave: (blob: Blob) => void;
 }
 
-const logger = createLogger({ name: 'react', level: 'debug' }); // TODO: hackeroni and cheese
-
 export function MaskCanvas(props: MaskCanvasProps) {
   const { source, mask } = props;
   const { params } = mustExist(useContext(ConfigContext));
+  const logger = mustExist(useContext(LoggerContext));
 
   function composite() {
     if (doesExist(viewRef.current)) {
diff --git a/gui/src/components/tab/Blend.tsx b/gui/src/components/tab/Blend.tsx
index 51660eb2..2460e400 100644
--- a/gui/src/components/tab/Blend.tsx
+++ b/gui/src/components/tab/Blend.tsx
@@ -1,4 +1,4 @@
-import { doesExist, mustDefault, mustExist } from '@apextoaster/js-utils';
+import { mustDefault, mustExist } from '@apextoaster/js-utils';
 import { Box, Button, Stack } from '@mui/material';
 import * as React from 'react';
 import { useContext } from 'react';
@@ -6,7 +6,8 @@ import { useMutation, useQueryClient } from 'react-query';
 import { useStore } from 'zustand';
 
 import { IMAGE_FILTER } from '../../config.js';
-import { ClientContext, StateContext } from '../../state.js';
+import { BLEND_SOURCES, ClientContext, StateContext } from '../../state.js';
+import { range } from '../../utils.js';
 import { UpscaleControl } from '../control/UpscaleControl.js';
 import { ImageInput } from '../input/ImageInput.js';
 import { MaskCanvas } from '../input/MaskCanvas.js';
@@ -41,22 +42,30 @@ export function Blend() {
 
   return <Box>
     <Stack spacing={2}>
-      <ImageInput
-        filter={IMAGE_FILTER}
-        image={sources[0]}
-        hideSelection={true}
-        label='Source'
-        onChange={(file) => {
-          setBlend({
-            sources: [file],
-          });
-        }}
-      />
+      {range(BLEND_SOURCES).map((idx) =>
+        <ImageInput
+          key={`source-${idx.toFixed(0)}`}
+          filter={IMAGE_FILTER}
+          image={sources[idx]}
+          hideSelection={true}
+          label='Source'
+          onChange={(file) => {
+            const newSources = [...sources];
+            newSources[idx] = file;
+
+            setBlend({
+              sources: newSources,
+            });
+          }}
+        />
+      )}
       <MaskCanvas
         source={sources[0]}
         mask={blend.mask}
-        onSave={() => {
-          // TODO
+        onSave={(mask) => {
+          setBlend({
+            mask,
+          });
         }}
       />
       <UpscaleControl />
diff --git a/gui/src/main.tsx b/gui/src/main.tsx
index f673dc60..a7004578 100644
--- a/gui/src/main.tsx
+++ b/gui/src/main.tsx
@@ -6,6 +6,7 @@ import { QueryClient, QueryClientProvider } from 'react-query';
 import { satisfies } from 'semver';
 import { createStore } from 'zustand';
 import { createJSONStorage, persist } from 'zustand/middleware';
+import { createLogger } from 'browser-bunyan';
 
 import { makeClient } from './client.js';
 import { ParamsVersionError } from './components/error/ParamsVersion.js';
@@ -13,7 +14,7 @@ import { ServerParamsError } from './components/error/ServerParams.js';
 import { OnnxError } from './components/OnnxError.js';
 import { OnnxWeb } from './components/OnnxWeb.js';
 import { getApiRoot, loadConfig, mergeConfig, PARAM_VERSION } from './config.js';
-import { ClientContext, ConfigContext, createStateSlices, OnnxState, STATE_VERSION, StateContext } from './state.js';
+import { ClientContext, ConfigContext, createStateSlices, OnnxState, STATE_VERSION, StateContext, LoggerContext } from './state.js';
 
 export const INITIAL_LOAD_TIMEOUT = 5_000;
 
@@ -91,6 +92,12 @@ export async function main() {
         version: STATE_VERSION,
       }));
 
+      const logger = createLogger({
+        name: 'onnx-web',
+        system: 'react',
+        level: 'debug',
+      });
+
       // prep react-query client
       const query = new QueryClient();
 
@@ -98,9 +105,11 @@ export async function main() {
       app.render(<QueryClientProvider client={query}>
         <ClientContext.Provider value={client}>
           <ConfigContext.Provider value={completeConfig}>
-            <StateContext.Provider value={state}>
-              <OnnxWeb />
-            </StateContext.Provider>
+            <LoggerContext.Provider value={logger}>
+              <StateContext.Provider value={state}>
+                <OnnxWeb />
+              </StateContext.Provider>
+            </LoggerContext.Provider>
           </ConfigContext.Provider>
         </ClientContext.Provider>
       </QueryClientProvider>);
diff --git a/gui/src/state.ts b/gui/src/state.ts
index 854bf964..535fbc55 100644
--- a/gui/src/state.ts
+++ b/gui/src/state.ts
@@ -1,6 +1,7 @@
 /* eslint-disable max-lines */
 /* eslint-disable no-null/no-null */
 import { doesExist, Maybe } from '@apextoaster/js-utils';
+import { Logger } from 'noicejs';
 import { createContext } from 'react';
 import { StateCreator, StoreApi } from 'zustand';
 
@@ -145,6 +146,11 @@ export const ClientContext = createContext<Maybe<ApiClient>>(undefined);
  */
 export const ConfigContext = createContext<Maybe<Config<ServerParams>>>(undefined);
 
+/**
+ * React context binding for bunyan logger.
+ */
+export const LoggerContext = createContext<Maybe<Logger>>(undefined);
+
 /**
  * React context binding for zustand state store.
  */
@@ -160,6 +166,8 @@ export const STATE_KEY = 'onnx-web';
  */
 export const STATE_VERSION = 5;
 
+export const BLEND_SOURCES = 2;
+
 /**
  * Default parameters for the inpaint brush.
  *
diff --git a/gui/src/utils.ts b/gui/src/utils.ts
index 6d564cc7..a209721c 100644
--- a/gui/src/utils.ts
+++ b/gui/src/utils.ts
@@ -10,3 +10,11 @@ export function imageFromBlob(blob: Blob): Promise<HTMLImageElement> {
     image.src = src;
   });
 }
+
+export function range(max: number): Array<number> {
+  return [...Array(max).keys()];
+}
+
+export function visibleIndex(idx: number): string {
+  return (idx + 1).toFixed(0);
+}
diff --git a/onnx-web.code-workspace b/onnx-web.code-workspace
index ebd137ae..8f441e9b 100644
--- a/onnx-web.code-workspace
+++ b/onnx-web.code-workspace
@@ -15,6 +15,7 @@
 		"cSpell.words": [
 			"astype",
 			"basicsr",
+			"Civitai",
 			"ckpt",
 			"codebook",
 			"codeformer",