diff --git a/api/README.md b/api/README.md
index 01a40448..db302cfa 100644
--- a/api/README.md
+++ b/api/README.md
@@ -32,23 +32,23 @@ const image = imagePool.ingestImage(imagePath);
 
 These `ingestImage` function can take anything the node [`readFile`][readFile] function can take, uncluding a buffer and `FileHandle`.
 
-The returned `image` object is a representation of the original image, that you can now manipulate, encode, and extract information about.
+The returned `image` object is a representation of the original image, that you can now preprocess, encode, and extract information about.
 
-## Manipulating and encoding images
+## Preprocessing and encoding images
 
-When an image has been ingested, you can start manipulating it and encoding it to other formats. This example will resize the image and then encode it to a `.jpg` and `.jxl` image:
+When an image has been ingested, you can start preprocessing it and encoding it to other formats. This example will resize the image and then encode it to a `.jpg` and `.jxl` image:
 
 ```js
-await image.decoded; //Wait until the image is decoded before running manipulations
+await image.decoded; //Wait until the image is decoded before running preprocessors
 
-const manipulateOptions: {
+const preprocessOptions: {
   resize: {
     enabled: true,
     width: 100,
     height: 50,
   }
 }
-await image.manipulate(manipulateOptions);
+await image.preprocess(preprocessOptions);
 
 const encodeOptions: {
   mozjpeg: {}, //an empty object means 'use default settings'
diff --git a/api/src/index.js b/api/src/index.js
index bb40c86b..0d6c0fb9 100644
--- a/api/src/index.js
+++ b/api/src/index.js
@@ -2,11 +2,11 @@ import { isMainThread } from 'worker_threads';
 import { cpus } from 'os';
 import { promises as fsp } from 'fs';
 
-import { codecs as encoders, preprocessors as manipulations } from './codecs.js';
+import { codecs as encoders, preprocessors} from './codecs.js';
 import WorkerPool from './worker_pool.js';
 import { autoOptimize } from './auto-optimizer.js';
 
-export { ImagePool, encoders, manipulations };
+export { ImagePool, encoders, preprocessors};
 
 
 async function decodeFile({ file }) {
@@ -30,9 +30,9 @@ async function decodeFile({ file }) {
   };
 }
 
-async function manipulateImage({ manipulationType, options, image }) {
-  const manipulator = await manipulations[manipulationType].instantiate();
-  image.bitmap = await manipulator(
+async function preprocessImage({ preprocessorName, options, image }) {
+  const preprocessor = await preprocessors[preprocessorName].instantiate();
+  image.bitmap = await preprocessor(
     image.bitmap.data,
     image.bitmap.width,
     image.bitmap.height,
@@ -103,8 +103,8 @@ function handleJob(params) {
       return encodeImage(params);
     case 'decode':
       return decodeFile(params);
-    case 'manipulate':
-      return manipulateImage(params);
+    case 'preprocess':
+      return preprocessImage(params);
     default:
       throw Error(`Invalid job "${operation}"`);
   }
@@ -121,25 +121,25 @@ class Image {
   }
 
   /**
-   * Define one or several manipulations to apply to the image.
-   * @param {object} manipulateOptions - An object with manipulations to apply, and their settings.
-   * @returns {Promise<undefined>} - A promise that resolves when all manipulations have completed.
+   * Define one or several preprocessors to use on the image.
+   * @param {object} preprocessOptions - An object with preprocessors to use, and their settings.
+   * @returns {Promise<undefined>} - A promise that resolves when all preprocessors have completed their work.
    */
-  async manipulate (manipulateOptions = {}) {
-    for (const [type, options] of Object.entries(manipulateOptions)) {
-      if (!Object.keys(manipulations).includes(type)) {
-        throw Error(`Invalid manipulation type "${type}"`);
+  async preprocess (preprocessOptions = {}) {
+    for (const [name, options] of Object.entries(preprocessOptions)) {
+      if (!Object.keys(preprocessors).includes(name)) {
+        throw Error(`Invalid preprocessor "${name}"`);
       }
-      const manipulatorOptions = Object.assign(
+      const preprocessorOptions = Object.assign(
         {},
-        manipulations[type].defaultOptions,
+        preprocessors[name].defaultOptions,
         options,
       );
       this.decoded = this.workerPool.dispatchJob({
-        operation: 'manipulate',
-        manipulationType: type,
+        operation: 'preprocess',
+        preprocessorName: name,
         image: await this.decoded,
-        options: manipulatorOptions,
+        options: preprocessorOptions,
       });
       await this.decoded;
     }
diff --git a/cli/src/index.js b/cli/src/index.js
old mode 100644
new mode 100755
index fb111658..b58d64ff
--- a/cli/src/index.js
+++ b/cli/src/index.js
@@ -8,7 +8,7 @@ import ora from 'ora';
 import kleur from 'kleur';
 
 //Replace package name with '../../api/build/index.js' to test unpublished changes in the API
-import { ImagePool, manipulations, encoders } from '@squoosh/api';
+import { ImagePool, preprocessors, encoders } from '@squoosh/api';
 
 function clamp(v, min, max) {
   if (v < min) return min;
@@ -129,17 +129,17 @@ async function processFiles(files) {
     }),
   );
 
-  const manipulationOptions = {};
+  const preprocessOptions = {};
 
-  for (const manipulatorType of Object.keys(manipulations)) {
-    if (!program[manipulatorType]) {
+  for (const preprocessorName of Object.keys(preprocessors)) {
+    if (!program[preprocessorName]) {
       continue;
     }
-    manipulationOptions[manipulatorType] = JSON5.parse(program[manipulatorType]);
+    preprocessOptions[preprocessorName] = JSON5.parse(program[preprocessorName]);
   }
 
   for(const image of decodedFiles){
-    image.manipulate(manipulationOptions);
+    image.preprocess(preprocessOptions);
   }
 
   await Promise.all(decodedFiles.map( (image) => image.decoded ));
@@ -214,7 +214,7 @@ program
   .action(processFiles);
 
 // Create a CLI option for each supported preprocessor
-for (const [key, value] of Object.entries(manipulations)) {
+for (const [key, value] of Object.entries(preprocessors)) {
   program.option(`--${key} [config]`, value.description);
 }
 // Create a CLI option for each supported encoder