diff --git a/package-lock.json b/package-lock.json
index f438291..75ee7e6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1519,6 +1519,9 @@
     "@rondo/common": {
       "version": "file:packages/common"
     },
+    "@rondo/image-upload": {
+      "version": "file:packages/image-upload"
+    },
     "@rondo/server": {
       "version": "file:packages/server",
       "requires": {
diff --git a/package.json b/package.json
index 22ed730..cbfacf9 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,8 @@
     "@rondo/server": "file:packages/server",
     "@rondo/comments-server": "file:packages/comments-server",
     "@rondo/comments-common": "file:packages/comments-common",
-    "@rondo/comments-client": "file:packages/comments-client"
+    "@rondo/comments-client": "file:packages/comments-client",
+    "@rondo/image-upload": "file:packages/image-upload"
   },
   "devDependencies": {
     "@types/bcrypt": "^3.0.0",
diff --git a/packages/image-upload/Buildfile b/packages/image-upload/Buildfile
new file mode 100644
index 0000000..40aaa22
--- /dev/null
+++ b/packages/image-upload/Buildfile
@@ -0,0 +1,8 @@
+build:
+  tsc
+
+esm:
+  tsc -p tsconfig.esm.json
+
+clean:
+  rm -rf lib/
diff --git a/packages/image-upload/jest.config.js b/packages/image-upload/jest.config.js
new file mode 100644
index 0000000..737dab0
--- /dev/null
+++ b/packages/image-upload/jest.config.js
@@ -0,0 +1,16 @@
+module.exports = {
+  roots: [
+    '<rootDir>/src'
+  ],
+  transform: {
+    '^.+\\.tsx?$': 'ts-jest'
+  },
+  testRegex: '(/__tests__/.*|\\.(test|spec))\\.tsx?$',
+  moduleFileExtensions: [
+    'ts',
+    'tsx',
+    'js',
+    'jsx'
+  ],
+  setupFiles: ['<rootDir>/jest.setup.js']
+}
diff --git a/packages/image-upload/jest.setup.js b/packages/image-upload/jest.setup.js
new file mode 100644
index 0000000..a952c9b
--- /dev/null
+++ b/packages/image-upload/jest.setup.js
@@ -0,0 +1,4 @@
+if (!process.env.LOG) {
+  process.env.LOG = 'sql:warn'
+}
+process.chdir(__dirname)
diff --git a/packages/image-upload/package.json b/packages/image-upload/package.json
new file mode 100644
index 0000000..914d248
--- /dev/null
+++ b/packages/image-upload/package.json
@@ -0,0 +1,11 @@
+{
+  "name": "@rondo/image-upload",
+  "private": true,
+  "peerDependencies": {
+    "react": "^16.7.0",
+    "react-dom": "^16.7.0"
+  },
+  "main": "lib/index.js",
+  "types": "lib/index.d.ts",
+  "module": "esm/index.js"
+}
diff --git a/packages/image-upload/src/ImageUpload.tsx b/packages/image-upload/src/ImageUpload.tsx
new file mode 100644
index 0000000..5ca7306
--- /dev/null
+++ b/packages/image-upload/src/ImageUpload.tsx
@@ -0,0 +1,45 @@
+import React from 'react'
+
+export interface IImage {
+  base64: string
+}
+
+export interface IImageUploadProps {
+  onChange: (images: IImage[]) => void
+  multiple: boolean
+}
+
+export class ImageUpload extends React.PureComponent<IImageUploadProps> {
+  fileInput: React.RefObject<HTMLInputElement>
+  constructor(props: IImageUploadProps) {
+    super(props)
+    this.fileInput = React.createRef()
+  }
+
+  handleChange = (event: React.SyntheticEvent<HTMLInputElement>) => {
+    const files = this.fileInput.current!.files!
+
+    Array.prototype.forEach.call(files, (file: File) => {
+      const reader = new FileReader()
+      reader.addEventListener('load', function() {
+        const {result} = this
+        console.log(file.name, result)
+        // TODO resize image...
+      })
+      reader.readAsDataURL(file)
+    })
+  }
+  render() {
+    return (
+      <div className='image-upload'>
+        <input
+          multiple={this.props.multiple}
+          type='file'
+          accept='image/*'
+          ref={this.fileInput}
+          onChange={this.handleChange}
+        />
+      </div>
+    )
+  }
+}
diff --git a/packages/image-upload/src/Resizer.ts b/packages/image-upload/src/Resizer.ts
new file mode 100644
index 0000000..d67d05f
--- /dev/null
+++ b/packages/image-upload/src/Resizer.ts
@@ -0,0 +1,208 @@
+interface IPartition {
+  source: ImageData
+  target: ImageData
+  startY: number
+  height: number
+}
+
+interface IWorkerParam {
+  sourceWidth: number
+  sourceHeight: number
+  width: number
+  height: number
+  core: number
+  source: ArrayBuffer
+}
+
+interface IWorkerParamMessage extends MessageEvent {
+  data: IWorkerParam
+}
+
+interface IWorkerResult {
+  core: number
+  target: Uint8ClampedArray
+}
+
+interface IWorkerResultMessage extends MessageEvent {
+  data: IWorkerResult
+}
+
+function ResizeWorker() {
+  function onmessage(event: IWorkerParamMessage) {
+    const core = event.data.core
+    const sourceWidth = event.data.sourceWidth
+    const sourceHeight = event.data.sourceHeight
+    const width = event.data.width
+    const height = event.data.height
+
+    const ratioW = sourceWidth / width
+    const ratioH = sourceHeight / height
+    const ratioHalfW = Math.ceil(ratioW / 2)
+    const ratioHalfH = Math.ceil(ratioH / 2)
+
+    const source = new Uint8ClampedArray(event.data.source)
+    const sourceH = source.length / sourceWidth / 4
+    const targetSize = width * height * 4
+    const targetMemory = new ArrayBuffer(targetSize)
+    const target = new Uint8ClampedArray(targetMemory, 0, targetSize)
+    // calculate
+    for (let j = 0; j < height; j++) {
+      for (let i = 0; i < width; i++) {
+        const x2 = (i + j * width) * 4
+        let weight = 0
+        let weights = 0
+        let weightsAlpha = 0
+        let gxR = 0
+        let gxG = 0
+        let gxB = 0
+        let gxA = 0
+        const centerY = j * ratioH
+
+        const xxStart = Math.floor(i * ratioW)
+        let xxStop = Math.ceil((i + 1) * ratioW)
+        const yyStart = Math.floor(j * ratioH)
+        let yyStop = Math.ceil((j + 1) * ratioH)
+
+        xxStop = Math.min(xxStop, sourceWidth)
+        yyStop = Math.min(yyStop, sourceHeight)
+
+        for (let yy = yyStart; yy < yyStop; yy++) {
+          const dy = Math.abs(centerY - yy) / ratioHalfH
+          const centerX = i * ratioW
+          const w0 = dy * dy // pre-calc part of w
+          for (let xx = xxStart; xx < xxStop; xx++) {
+            const dx = Math.abs(centerX - xx) / ratioHalfW
+            const w = Math.sqrt(w0 + dx * dx)
+            if (w >= 1) {
+              // pixel too far
+              continue
+            }
+            // hermite filter
+            weight = 2 * w * w * w - 3 * w * w + 1
+            // calc source pixel location
+            const posX = 4 * (xx + yy * sourceWidth)
+            // alpha
+            gxA += weight * source[posX + 3]
+            weightsAlpha += weight
+            // colors
+            if (source[posX + 3] < 255) {
+              weight = weight * source[posX + 3] / 250
+            }
+            gxR += weight * source[posX]
+            gxG += weight * source[posX + 1]
+            gxB += weight * source[posX + 2]
+            weights += weight
+          }
+        }
+        target[x2] = gxR / weights
+        target[x2 + 1] = gxG / weights
+        target[x2 + 2] = gxB / weights
+        target[x2 + 3] = gxA / weightsAlpha
+      }
+    }
+
+    const objData: IWorkerResult = {
+      core,
+      target,
+    }
+    postMessage(objData, [target.buffer] as any)
+  }
+}
+
+export class Resizer {
+  readonly cores = navigator.hardwareConcurrency || 4
+  readonly workerBlobURL = window.URL.createObjectURL(
+    new Blob(
+      ['(', ResizeWorker.toString(), ')()'],
+      {type: 'application/javascript'},
+    ))
+
+  async resample(canvas: HTMLCanvasElement, width: number, height: number) {
+    const {cores} = this
+    const sourceWidth = canvas.width
+    const sourceHeight = canvas.height
+    width = Math.round(width)
+    height = Math.round(height)
+    const ratioH = sourceHeight / height
+
+    const workers = new Array(cores)
+    // TODO handle null
+    const ctx = canvas.getContext('2d')!
+
+    // prepare source and target data for workers
+    const partitions: IPartition[] = new Array(cores)
+    const blockHeight = Math.ceil(sourceHeight / cores / 2) * 2
+    let endY = -1
+    for (let c = 0; c < cores; c++) {
+      // source
+      const offsetY = endY + 1
+      if (offsetY >= sourceHeight) {
+        // size too small, nothing left for this core
+        continue
+      }
+
+      endY = offsetY + blockHeight - 1
+      endY = Math.min(endY, sourceHeight - 1)
+
+      let currentBlockHeight = blockHeight
+      currentBlockHeight = Math.min(blockHeight, sourceHeight - offsetY)
+
+      // console.log(
+      // 'source split: ', '#'+c, offsetY, endY, 'height: '+currentBlockHeight);
+
+      partitions[c] = {
+        source: ctx.getImageData(0, offsetY, sourceWidth, blockHeight),
+        target: ctx.createImageData(
+          width, Math.ceil(currentBlockHeight / ratioH)),
+        startY: Math.ceil(offsetY / ratioH),
+        height: currentBlockHeight,
+      }
+    }
+
+    ctx.clearRect(0, 0, sourceWidth, sourceHeight)
+
+    let resolve: () => void
+    const promise = new Promise(r => resolve = r)
+
+    // start
+    let activeWorkers = 0
+    for (let c = 0; c < cores; c++) {
+      if (partitions[c] === undefined) {
+        // no job for this worker
+        continue
+      }
+
+      activeWorkers++
+      const worker = new Worker(this.workerBlobURL)
+      workers[c] = worker
+
+      worker.onmessage = (event: IWorkerResultMessage) => {
+        activeWorkers--
+        const core = event.data.core
+        workers[core].terminate()
+        delete workers[core]
+
+        // draw
+        // const height_part = Math.ceil(partitions[core].height / ratioH)
+        // partitions[core].target = ctx.createImageData(width, height_part)
+        partitions[core].target.data.set(event.data.target)
+        ctx.putImageData(partitions[core].target, 0, partitions[core].startY)
+
+        if (activeWorkers <= 0) {
+          resolve()
+        }
+      }
+      const message: IWorkerParam = {
+        sourceWidth,
+        sourceHeight: partitions[c].height,
+        width,
+        height: Math.ceil(partitions[c].height / ratioH),
+        core: c,
+        source: partitions[c].source.data.buffer,
+      }
+      worker.postMessage(message, [message.source])
+    }
+
+    return promise
+  }
+}
diff --git a/packages/image-upload/src/index.ts b/packages/image-upload/src/index.ts
new file mode 100644
index 0000000..c88df17
--- /dev/null
+++ b/packages/image-upload/src/index.ts
@@ -0,0 +1 @@
+export * from './ImageUpload'
diff --git a/packages/image-upload/tsconfig.esm.json b/packages/image-upload/tsconfig.esm.json
new file mode 100644
index 0000000..915284d
--- /dev/null
+++ b/packages/image-upload/tsconfig.esm.json
@@ -0,0 +1,7 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "esm"
+  },
+  "references": []
+}
diff --git a/packages/image-upload/tsconfig.json b/packages/image-upload/tsconfig.json
new file mode 100644
index 0000000..3b72bf2
--- /dev/null
+++ b/packages/image-upload/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "../tsconfig.common.json",
+  "compilerOptions": {
+    "outDir": "lib",
+    "rootDir": "src"
+  },
+  "references": []
+}
diff --git a/packages/image-upload/tslint.json b/packages/image-upload/tslint.json
new file mode 100644
index 0000000..aa5f8cd
--- /dev/null
+++ b/packages/image-upload/tslint.json
@@ -0,0 +1,5 @@
+{
+    "extends": [
+        "../tslint.json"
+    ]
+}