diff --git a/lib/feature-plugin.js b/lib/feature-plugin.js
index 91198641..597e65c1 100644
--- a/lib/feature-plugin.js
+++ b/lib/feature-plugin.js
@@ -145,21 +145,24 @@ export default function () {
   }
 
   async function generateFeatureMeta() {
-    const encoderMetas = (
-      await globP('src/features/encoders/*/shared/meta.ts', {
+    const getTsFiles = (glob) =>
+      globP(glob, {
         absolute: true,
-      })
-    )
-      .filter((tsFile) => !tsFile.endsWith('.d.ts'))
-      .map((tsFile) => tsFile.slice(0, -'.ts'.length));
+      }).then((paths) =>
+        paths
+          .filter((tsFile) => !tsFile.endsWith('.d.ts'))
+          .map((tsFile) => tsFile.slice(0, -'.ts'.length)),
+      );
 
-    const processorMetas = (
-      await globP('src/features/processors/*/shared/meta.ts', {
-        absolute: true,
-      })
-    )
-      .filter((tsFile) => !tsFile.endsWith('.d.ts'))
-      .map((tsFile) => tsFile.slice(0, -'.ts'.length));
+    const metas = await Promise.all(
+      [
+        'src/features/encoders/*/shared/meta.ts',
+        'src/features/processors/*/shared/meta.ts',
+        'src/features/preprocessors/*/shared/meta.ts',
+      ].map((glob) => getTsFiles(glob)),
+    );
+
+    const [encoderMetas, processorMetas, preprocessorMetas] = metas;
 
     const featureMetaBasePath = path.join(
       process.cwd(),
@@ -169,7 +172,7 @@ export default function () {
       'feature-meta',
     );
 
-    const joinedMetas = [...encoderMetas, ...processorMetas].join();
+    const joinedMetas = metas.flat().join();
 
     // Avoid regenerating if nothing's changed.
     // This also prevents an infinite loop in the watcher.
@@ -181,8 +184,15 @@ export default function () {
       path.basename(tsImport.slice(0, -'/shared/meta'.length)),
     ];
 
-    const encoderMetaTsNames = encoderMetas.map(getTsName);
-    const processorMetaTsNames = processorMetas.map(getTsName);
+    const encoderMetaTsNames = encoderMetas.map((tsImport) =>
+      getTsName(tsImport),
+    );
+    const processorMetaTsNames = processorMetas.map((tsImport) =>
+      getTsName(tsImport),
+    );
+    const preprocessorMetaTsNames = preprocessorMetas.map((tsImport) =>
+      getTsName(tsImport),
+    );
 
     const featureMeta = [
       autoGenComment,
@@ -222,6 +232,20 @@ export default function () {
           `  ${name}: { enabled: false, ...${name}ProcessorMeta.defaultOptions },`,
       ),
       `}`,
+      // Preprocessor stuff
+      preprocessorMetaTsNames.map(
+        ([path, name]) => `import * as ${name}PreprocessorMeta from '${path}';`,
+      ),
+      `export interface PreprocessorState {`,
+      preprocessorMetaTsNames.map(
+        ([_, name]) => `  ${name}: ${name}PreprocessorMeta.Options,`,
+      ),
+      `}`,
+      `export const defaultPreprocessorState: PreprocessorState = {`,
+      preprocessorMetaTsNames.map(
+        ([_, name]) => `  ${name}: ${name}PreprocessorMeta.defaultOptions,`,
+      ),
+      `};`,
     ]
       .flat(Infinity)
       .join('\n');
diff --git a/src/client/lazy-app/Compress/index.tsx b/src/client/lazy-app/Compress/index.tsx
index 0f39dc14..f7560eee 100644
--- a/src/client/lazy-app/Compress/index.tsx
+++ b/src/client/lazy-app/Compress/index.tsx
@@ -1,5 +1,7 @@
 import { h, Component } from 'preact';
 
+import * as style from './style.css';
+import 'add-css:./style.css';
 import {
   blobToImg,
   drawableToImageData,
@@ -7,41 +9,35 @@ import {
   builtinDecode,
   sniffMimeType,
   canDecodeImageType,
+  abortable,
+  assertSignal,
 } from '../util';
-import * as style from './style.css';
-import 'add-css:./style.css';
+import {
+  PreprocessorState,
+  ProcessorState,
+  EncoderState,
+} from '../feature-meta';
 import Output from '../Output';
 import Options from '../Options';
 import ResultCache from './result-cache';
-import { decodeImage } from '../../codecs/decoders';
 import { cleanMerge, cleanSet } from '../../lib/clean-modify';
-import Processor from '../../codecs/processor';
-import {
-  BrowserResizeOptions,
-  isWorkerOptions as isWorkerResizeOptions,
-  isHqx,
-  WorkerResizeOptions,
-} from '../../codecs/resize/processor-meta';
 import './custom-els/MultiPanel';
 import Results from '../results';
 import { ExpandIcon, CopyAcrossIconProps } from '../../lib/icons';
 import SnackBarElement from '../../lib/SnackBar';
-import {
-  InputProcessorState,
-  defaultInputProcessorState,
-} from '../../codecs/input-processors';
 import WorkerBridge from '../worker-bridge';
+import { resize } from 'features/processors/resize/client';
 
 export interface SourceImage {
   file: File;
   decoded: ImageData;
   processed: ImageData;
   vectorImage?: HTMLImageElement;
-  inputProcessorState: InputProcessorState;
+  preprocessorState: PreprocessorState;
 }
 
 interface SideSettings {
-  preprocessorState: PreprocessorState;
+  processorState: ProcessorState;
   encoderState: EncoderState;
 }
 
@@ -79,8 +75,9 @@ async function decodeImage(
   blob: Blob,
   workerBridge: WorkerBridge,
 ): Promise<ImageData> {
-  const mimeType = await sniffMimeType(blob);
-  const canDecode = await canDecodeImageType(mimeType);
+  assertSignal(signal);
+  const mimeType = await abortable(signal, sniffMimeType(blob));
+  const canDecode = await abortable(signal, canDecodeImageType(mimeType));
 
   try {
     if (!canDecode) {
@@ -92,63 +89,52 @@ async function decodeImage(
       }
       // If it's not one of those types, fall through and try built-in decoding for a laugh.
     }
-    return await builtinDecode(blob);
+    return await abortable(signal, builtinDecode(blob));
   } catch (err) {
+    if (err.name === 'AbortError') throw err;
+    console.log(err);
     throw Error("Couldn't decode image");
   }
 }
 
-async function processInput(
+async function preprocessImage(
+  signal: AbortSignal,
   data: ImageData,
-  inputProcessData: InputProcessorState,
-  processor: Processor,
-) {
+  preprocessorState: PreprocessorState,
+  workerBridge: WorkerBridge,
+): Promise<ImageData> {
+  assertSignal(signal);
   let processedData = data;
 
-  if (inputProcessData.rotate.rotate !== 0) {
-    processedData = await processor.rotate(
+  if (preprocessorState.rotate.rotate !== 0) {
+    processedData = await workerBridge.rotate(
+      signal,
       processedData,
-      inputProcessData.rotate,
+      preprocessorState.rotate,
     );
   }
 
   return processedData;
 }
 
-async function preprocessImage(
+async function processImage(
+  signal: AbortSignal,
   source: SourceImage,
-  preprocessData: PreprocessorState,
-  processor: Processor,
+  processorState: ProcessorState,
+  workerBridge: WorkerBridge,
 ): Promise<ImageData> {
+  assertSignal(signal);
   let result = source.processed;
 
-  if (preprocessData.resize.enabled) {
-    if (preprocessData.resize.method === 'vector' && source.vectorImage) {
-      result = processor.vectorResize(
-        source.vectorImage,
-        preprocessData.resize,
-      );
-    } else if (isHqx(preprocessData.resize)) {
-      // Hqx can only do x2, x3 or x4.
-      result = await processor.workerResize(result, preprocessData.resize);
-      // If the target size is not a clean x2, x3 or x4, use Catmull-Rom
-      // for the remaining scaling.
-      const pixelOpts = { ...preprocessData.resize, method: 'catrom' };
-      result = await processor.workerResize(
-        result,
-        pixelOpts as WorkerResizeOptions,
-      );
-    } else if (isWorkerResizeOptions(preprocessData.resize)) {
-      result = await processor.workerResize(result, preprocessData.resize);
-    } else {
-      result = processor.resize(
-        result,
-        preprocessData.resize as BrowserResizeOptions,
-      );
-    }
+  if (processorState.resize.enabled) {
+    result = await resize(signal, source, processorState.resize, workerBridge);
   }
-  if (preprocessData.quantizer.enabled) {
-    result = await processor.imageQuant(result, preprocessData.quantizer);
+  if (processorState.quantizer.enabled) {
+    result = await workerBridge.imageQuant(
+      signal,
+      result,
+      processorState.quantizer,
+    );
   }
   return result;
 }
@@ -264,7 +250,7 @@ export default class Compress extends Component<Props, State> {
     sides: [
       {
         latestSettings: {
-          preprocessorState: defaultPreprocessorState,
+          processorState: defaultPreprocessorState,
           encoderState: {
             type: identity.type,
             options: identity.defaultOptions,
@@ -276,7 +262,7 @@ export default class Compress extends Component<Props, State> {
       },
       {
         latestSettings: {
-          preprocessorState: defaultPreprocessorState,
+          processorState: defaultPreprocessorState,
           encoderState: { type: mozJPEG.type, options: mozJPEG.defaultOptions },
         },
         loadingCounter: 0,
@@ -376,8 +362,7 @@ export default class Compress extends Component<Props, State> {
       const encoderChanged =
         side.latestSettings.encoderState !== prevSettings.encoderState;
       const preprocessorChanged =
-        side.latestSettings.preprocessorState !==
-        prevSettings.preprocessorState;
+        side.latestSettings.processorState !== prevSettings.processorState;
 
       // The image only needs updated if the encoder/preprocessor settings have changed, or the
       // source has changed.
@@ -421,7 +406,7 @@ export default class Compress extends Component<Props, State> {
     const source = this.state.source;
     if (!source) return;
 
-    const oldRotate = source.inputProcessorState.rotate.rotate;
+    const oldRotate = source.preprocessorState.rotate.rotate;
     const newRotate = options.rotate.rotate;
     const orientationChanged = oldRotate % 180 !== newRotate % 180;
     const loadingCounter = this.state.loadingCounter + 1;
@@ -439,7 +424,11 @@ export default class Compress extends Component<Props, State> {
     this.rightProcessor.abortCurrent();
 
     try {
-      const processed = await processInput(source.decoded, options, processor);
+      const processed = await preprocessImage(
+        source.decoded,
+        options,
+        processor,
+      );
 
       // Another file has been opened/processed before this one processed.
       if (this.state.loadingCounter !== loadingCounter) return;
@@ -452,7 +441,7 @@ export default class Compress extends Component<Props, State> {
         // If orientation has changed, we should flip the resize values.
         for (const i of [0, 1]) {
           const resizeSettings =
-            newState.sides[i].latestSettings.preprocessorState.resize;
+            newState.sides[i].latestSettings.processorState.resize;
           newState = cleanMerge(
             newState,
             `sides.${i}.latestSettings.preprocessorState.resize`,
@@ -500,7 +489,7 @@ export default class Compress extends Component<Props, State> {
         decoded = await decodeImage(file, processor);
       }
 
-      const processed = await processInput(
+      const processed = await preprocessImage(
         decoded,
         defaultInputProcessorState,
         processor,
@@ -516,7 +505,7 @@ export default class Compress extends Component<Props, State> {
           file,
           vectorImage,
           processed,
-          inputProcessorState: defaultInputProcessorState,
+          preprocessorState: defaultInputProcessorState,
         },
         loading: false,
       };
@@ -617,7 +606,7 @@ export default class Compress extends Component<Props, State> {
           preprocessed =
             skipPreprocessing && side.preprocessed
               ? side.preprocessed
-              : await preprocessImage(
+              : await processImage(
                   source,
                   settings.preprocessorState,
                   processor,
@@ -679,7 +668,7 @@ export default class Compress extends Component<Props, State> {
       <Options
         source={source}
         mobileView={mobileView}
-        preprocessorState={side.latestSettings.preprocessorState}
+        preprocessorState={side.latestSettings.processorState}
         encoderState={side.latestSettings.encoderState}
         onEncoderTypeChange={this.onEncoderTypeChange.bind(
           this,
@@ -729,11 +718,11 @@ export default class Compress extends Component<Props, State> {
     const rightDisplaySettings =
       rightSide.encodedSettings || rightSide.latestSettings;
     const leftImgContain =
-      leftDisplaySettings.preprocessorState.resize.enabled &&
-      leftDisplaySettings.preprocessorState.resize.fitMethod === 'contain';
+      leftDisplaySettings.processorState.resize.enabled &&
+      leftDisplaySettings.processorState.resize.fitMethod === 'contain';
     const rightImgContain =
-      rightDisplaySettings.preprocessorState.resize.enabled &&
-      rightDisplaySettings.preprocessorState.resize.fitMethod === 'contain';
+      rightDisplaySettings.processorState.resize.enabled &&
+      rightDisplaySettings.processorState.resize.fitMethod === 'contain';
 
     return (
       <div class={style.compress}>
@@ -745,7 +734,7 @@ export default class Compress extends Component<Props, State> {
           leftImgContain={leftImgContain}
           rightImgContain={rightImgContain}
           onBack={onBack}
-          inputProcessorState={source && source.inputProcessorState}
+          inputProcessorState={source && source.preprocessorState}
           onInputProcessorChange={this.onInputProcessorChange}
         />
         {mobileView ? (
diff --git a/src/client/lazy-app/util.ts b/src/client/lazy-app/util.ts
index 6e3a84e9..951fa2c8 100644
--- a/src/client/lazy-app/util.ts
+++ b/src/client/lazy-app/util.ts
@@ -367,6 +367,13 @@ export function preventDefault(event: Event) {
   event.preventDefault();
 }
 
+/**
+ * Throw an abort error if a signal is aborted.
+ */
+export function assertSignal(signal: AbortSignal) {
+  if (signal.aborted) throw new DOMException('AbortError', 'AbortError');
+}
+
 /**
  * Take a signal and promise, and returns a promise that rejects with an AbortError if the abort is
  * signalled, otherwise resolves with the promise.
@@ -375,7 +382,7 @@ export async function abortable<T>(
   signal: AbortSignal,
   promise: Promise<T>,
 ): Promise<T> {
-  if (signal.aborted) throw new DOMException('AbortError', 'AbortError');
+  assertSignal(signal);
   return Promise.race([
     promise,
     new Promise<T>((_, reject) => {
diff --git a/src/client/tsconfig.json b/src/client/tsconfig.json
index 322480a8..f671b5e3 100644
--- a/src/client/tsconfig.json
+++ b/src/client/tsconfig.json
@@ -10,6 +10,7 @@
     { "path": "../features/encoders/identity/shared" },
     { "path": "../features/encoders/browserGIF/shared" },
     { "path": "../features/encoders/browserJPEG/shared" },
-    { "path": "../features/encoders/browserPNG/shared" }
+    { "path": "../features/encoders/browserPNG/shared" },
+    { "path": "../features/processors/resize/client" }
   ]
 }
diff --git a/src/features/preprocessors/rotate/shared/meta.ts b/src/features/preprocessors/rotate/shared/meta.ts
new file mode 100644
index 00000000..f7f210dc
--- /dev/null
+++ b/src/features/preprocessors/rotate/shared/meta.ts
@@ -0,0 +1,19 @@
+/**
+ * Copyright 2020 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+export interface Options {
+  rotate: 0 | 90 | 180 | 270;
+}
+
+export const defaultOptions: Options = {
+  rotate: 0,
+};
diff --git a/src/features/preprocessors/rotate/shared/missing-types.d.ts b/src/features/preprocessors/rotate/shared/missing-types.d.ts
new file mode 100644
index 00000000..c729fd74
--- /dev/null
+++ b/src/features/preprocessors/rotate/shared/missing-types.d.ts
@@ -0,0 +1,13 @@
+/**
+ * Copyright 2020 Google Inc. All Rights Reserved.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/// <reference path="../../../../../missing-types.d.ts" />
diff --git a/src/features/preprocessors/rotate/shared/tsconfig.json b/src/features/preprocessors/rotate/shared/tsconfig.json
new file mode 100644
index 00000000..bea39d16
--- /dev/null
+++ b/src/features/preprocessors/rotate/shared/tsconfig.json
@@ -0,0 +1,7 @@
+{
+  "extends": "../../../../../generic-tsconfig.json",
+  "compilerOptions": {
+    "lib": ["webworker", "esnext"]
+  },
+  "references": [{ "path": "../../../" }]
+}
diff --git a/src/features/preprocessors/rotate/worker/rotate.ts b/src/features/preprocessors/rotate/worker/rotate.ts
index a4491819..905f6bf2 100644
--- a/src/features/preprocessors/rotate/worker/rotate.ts
+++ b/src/features/preprocessors/rotate/worker/rotate.ts
@@ -11,10 +11,7 @@
  * limitations under the License.
  */
 import wasmUrl from 'url:codecs/rotate/rotate.wasm';
-
-export interface RotateOptions {
-  rotate: 0 | 90 | 180 | 270;
-}
+import { Options } from '../shared/meta';
 
 export interface RotateModuleInstance {
   exports: {
@@ -33,7 +30,7 @@ const instancePromise = fetch(wasmUrl)
 
 export default async function rotate(
   data: ImageData,
-  opts: RotateOptions,
+  opts: Options,
 ): Promise<ImageData> {
   const instance = (await instancePromise).instance as RotateModuleInstance;
 
diff --git a/src/features/preprocessors/rotate/worker/tsconfig.json b/src/features/preprocessors/rotate/worker/tsconfig.json
index bea39d16..959fe910 100644
--- a/src/features/preprocessors/rotate/worker/tsconfig.json
+++ b/src/features/preprocessors/rotate/worker/tsconfig.json
@@ -3,5 +3,5 @@
   "compilerOptions": {
     "lib": ["webworker", "esnext"]
   },
-  "references": [{ "path": "../../../" }]
+  "references": [{ "path": "../../../" }, { "path": "../shared" }]
 }
diff --git a/src/features/processors/resize/client/index.ts b/src/features/processors/resize/client/index.ts
index 0a9f519a..2c7fd2a0 100644
--- a/src/features/processors/resize/client/index.ts
+++ b/src/features/processors/resize/client/index.ts
@@ -3,13 +3,27 @@ import {
   BuiltinResizeMethod,
   drawableToImageData,
 } from 'client/lazy-app/util';
-import { BrowserResizeOptions, VectorResizeOptions } from '../shared/meta';
+import {
+  BrowserResizeOptions,
+  VectorResizeOptions,
+  WorkerResizeOptions,
+  Options,
+  workerResizeMethods,
+} from '../shared/meta';
 import { getContainOffsets } from '../shared/util';
+import type { SourceImage } from 'client/lazy-app/Compress';
+import type WorkerBridge from 'client/lazy-app/worker-bridge';
 
-export function browserResize(
-  data: ImageData,
-  opts: BrowserResizeOptions,
-): ImageData {
+/**
+ * Return whether a set of options are worker resize options.
+ *
+ * @param opts
+ */
+function isWorkerOptions(opts: Options): opts is WorkerResizeOptions {
+  return (workerResizeMethods as string[]).includes(opts.method);
+}
+
+function browserResize(data: ImageData, opts: BrowserResizeOptions): ImageData {
   let sx = 0;
   let sy = 0;
   let sw = data.width;
@@ -31,7 +45,7 @@ export function browserResize(
   );
 }
 
-export function vectorResize(
+function vectorResize(
   data: HTMLImageElement,
   opts: VectorResizeOptions,
 ): ImageData {
@@ -53,3 +67,19 @@ export function vectorResize(
     height: opts.height,
   });
 }
+
+export async function resize(
+  signal: AbortSignal,
+  source: SourceImage,
+  options: Options,
+  workerBridge: WorkerBridge,
+) {
+  if (options.method === 'vector') {
+    if (!source.vectorImage) throw Error('No vector image available');
+    return vectorResize(source.vectorImage, options);
+  }
+  if (isWorkerOptions(options)) {
+    return workerBridge.resize(signal, source.processed, options);
+  }
+  return browserResize(source.processed, options);
+}
diff --git a/src/features/processors/resize/client/tsconfig.json b/src/features/processors/resize/client/tsconfig.json
index cb9a599c..821289e4 100644
--- a/src/features/processors/resize/client/tsconfig.json
+++ b/src/features/processors/resize/client/tsconfig.json
@@ -7,6 +7,7 @@
   "include": [
     "./*.ts",
     "../../../../client/lazy-app/util.ts",
+    "../../../../client/lazy-app/Compress/index.tsx",
     "../shared/*.ts"
   ],
   "references": [{ "path": "../shared" }]
diff --git a/src/features/processors/resize/shared/meta.ts b/src/features/processors/resize/shared/meta.ts
index a83a9768..78b1580b 100644
--- a/src/features/processors/resize/shared/meta.ts
+++ b/src/features/processors/resize/shared/meta.ts
@@ -23,6 +23,14 @@ type WorkerResizeMethods =
   | 'lanczos3'
   | 'hqx';
 
+export const workerResizeMethods: WorkerResizeMethods[] = [
+  'triangle',
+  'catrom',
+  'mitchell',
+  'lanczos3',
+  'hqx',
+];
+
 export type Options =
   | BrowserResizeOptions
   | WorkerResizeOptions