diff --git a/changePool.js b/changePool.js
new file mode 100644
index 0000000..79799a0
--- /dev/null
+++ b/changePool.js
@@ -0,0 +1,259 @@
+'use strict';
+
+/**
+ * Replaces all data attributes of embedded images with links to a file stored on disk.
+ * When ep_image_upload is configured to use base64-encoded data URIs (default), these images occupy
+ * space in the pool and in recent versions of Etherpad, the pool is stored on every 100th revisions.
+ * When storing new changesets in the DB Etherpad also stores the full attributed text, including
+ * the pool. So besides consuming a lot of space in every key revision, there are large DB queries
+ * written to the pool on every changeset, which can slow down Etherpad.
+ *
+ * This script moves images to the directory that is configured in the ep_image_upload
+ * block of settings.json. In case an attribute is changed, it will *remove* the pool
+ * from all key revisions of that pad. In future versions this can be improved, so that
+ * the pool of key revisions is changed in the same way the pool of the whole pad is
+ * changed.
+ *
+ * When running this script, watch for error messages, ie
+ * grep 'ERROR.*CHANGEPOOL' /var/log/etherpad/etherpad.log
+ *
+ * Depending on your settings there might be additional mime-types to consider.
+ */
+
+if (process.argv.length < 4) {
+  console.error('USAGE: \n\
+  node changePool.js days maxSize(kByte) [waitDelay(milliseconds)] \n\
+  \n\
+  days: limit the pads to be considered by time interval \n\
+  maxSize: only consider images that are larger than maxSize \n\
+  waitDelay: wait between database queries \n\
+  \n\
+  example:\n\
+  node changePool.js 1000 1 20 \n\
+  \n\
+  moves all images that are larger than 1024 bytes from pads that where edited less than 1000 days ago\n\
+  while waiting 20 ms between individual queries\n\
+  ');
+  process.exit(1);
+}
+
+const uuid = require('uuid');
+const parseDataUrl = require('parse-data-url');
+
+const delay = ms => new Promise(resolve => {
+  setTimeout(resolve, ms)
+});
+
+// As of v14, Node.js does not exit when there is an unhandled Promise rejection. Convert an
+// unhandled rejection into an uncaught exception, which does cause Node.js to exit.
+process.on('unhandledRejection', (err) => {
+  if (bytesWritten > 0) {
+    console.log(`CHANGEPOOL stored images of size ${bytesWritten/1024/1024}MB to disk`);
+  }
+  throw err;
+});
+
+const newerThan = new Date(Date.now() - parseInt(process.argv[2]) * 24 * 3600 * 1000);
+const maxSize = parseFloat(process.argv[3]) * 1024;
+const waitDelay = parseInt(process.argv[4]);
+
+(async () => {
+  const settings = require('ep_etherpad-lite/node/utils/Settings');
+  const baseFolder = settings.ep_image_upload.storage.baseFolder;
+  const baseURL = settings.ep_image_upload.storage.baseURL;
+  const path = require('path');
+  const fsp = require('fs').promises;
+  const padManager = require('ep_etherpad-lite/node/db/PadManager');
+  const db = require('ep_etherpad-lite/node/db/DB');
+  await db.init();
+  const pads = await padManager.listAllPads();
+
+  console.log(`CHANGEPOOL there are ${pads.padIDs.length} pads on the instance`);
+
+  let bytesWritten = 0;
+  for (const padId of pads.padIDs) {
+    if (waitDelay) {
+      await delay(waitDelay);
+    }
+    let pad;
+    try {
+      pad = await padManager.getPad(padId);
+    } catch(err) {
+      console.error(`CHANGEPOOL error processing pad ${padId}`);
+      continue;
+    }
+
+    if (pad.pool == null) {
+      console.error(`CHANGEPOOL ${pad.id} Missing attribute pool`);
+      continue;
+    }
+
+    const headRev = pad.getHeadRevisionNumber();
+    if (typeof headRev !== 'number') {
+      console.error(`CHANGEPOOL head revision ${headRev} not found in ${pad.id}`);
+      continue;
+    }
+
+    let lastEdited;
+    const padHead = await db.get(`pad:${pad.id}:revs:${headRev}`);
+    if (padHead && padHead.meta && padHead.meta.timestamp) {
+      lastEdited = padHead.meta.timestamp;
+    } else {
+      console.error(`CHANGEPOOL no timestamp found in pad:${pad.id}:revs:${headRev}`);
+      continue;
+    }
+
+    // pad was not edited within the last x days
+    if (lastEdited < newerThan) {
+      continue;
+    }
+
+    let foundImage = false;
+    // iterate over the whole pool
+    for (const attribNum of Object.keys(pad.pool.numToAttrib)) {
+      const [name, value] = pad.pool.getAttrib(attribNum);
+
+      // an embedded image larger than maxSize was found
+      if (name === 'img' && value.length > maxSize) {
+        let image = parseDataUrl(value);
+        let slice;
+        if (image) {
+          console.log(`CHANGEPOOL found image with attribute number ${attribNum} in pad ${pad.id} contentType: ${image.contentType}`);
+          foundImage = true;
+        } else {
+          // sometimes images are stored using complete HTML, ie `<img src=data:...`, try to repair them
+          slice = value.match(/(data:[^">]*)/);
+	        if (slice && slice[0]) {
+	          image = parseDataUrl(slice[0]);
+            if (image) {
+              console.log(`CHANGEPOOL repaired image with attribute number ${attribNum} in pad ${pad.id} contentType: ${image.contentType}`);
+              foundImage = true;
+            } else {
+              console.error(`CHANGEPOOL found image with non-valid data attribute ${attribNum} in pad ${pad.id}. The first 30 bytes are: ${value.slice(0,30)}`);
+              continue;
+            }
+	        } else {
+            console.error(`CHANGEPOOL cannot parse image attribute ${attribNum} in pad ${pad.id}. The first 30 bytes are: ${value.slice(0,30)}`);
+            continue;
+          }
+        }
+        const contentType = image.contentType;
+        let fileExt;
+        if (contentType === 'image/gif') {
+          fileExt = 'gif';
+        } else if (contentType === 'image/jpeg') {
+          fileExt = 'jpeg';
+        } else if (contentType === 'image/jpg') {
+          fileExt = 'jpg';
+        } else if (contentType === 'image/pjpeg') {
+          fileExt = 'pjpeg';
+        } else if (contentType === 'image/png') {
+          fileExt = 'png';
+        } else if (contentType === 'image/heic') {
+          fileExt = 'heic';
+        } else if (contentType === 'image/webp') {
+          fileExt = 'webp';
+        } else if (contentType === 'image/svg+xml') {
+          fileExt = 'svg';
+        } else if (contentType === 'text/html') {
+          fileExt = 'html';
+        } else if (contentType === 'audio/mpeg') {
+          fileExt = 'mp3';
+        } else if (contentType === 'video/x-matroska') {
+          fileExt = 'mkv';
+        } else if (contentType === 'text/calendar') {
+          fileExt = 'ics';
+        } else if (contentType === 'application/pdf') {
+          fileExt = 'pdf';
+        } else if (contentType === 'application/octet-stream') {
+          fileExt = 'data';
+        } else if (contentType === 'application/msword') {
+          fileExt = 'doc';
+        } else if (contentType === 'application/vnd.oasis.opendocument.text') {
+          fileExt = 'odt';
+        } else if (contentType === 'application/vnd.openxmlformats-officedocument.presentationml.presentation') {
+          fileExt = 'pptx';
+        } else if (contentType === 'application/vnd.openxmlformats-officedocument.wordprocessingml.document') {
+          fileExt = 'docx';
+        } else if (contentType === undefined) {
+          fileExt = 'data';
+        } else {
+          console.error(`CHANGEPOOL ignoring image attribute ${attribNum} with type ${contentType} in pad ${pad.id}`);
+          if (!foundImage) foundImage = false;
+          continue;
+        }
+
+        const fileName = uuid.v4();
+        const newFilePath = `${path.join(baseFolder, pad.id, fileName)}.${fileExt}`;
+        const dirname = path.dirname(newFilePath);
+        const imageLink = `${baseURL}${pad.id}/${fileName}.${fileExt}`;
+        try {
+          await fsp.stat(dirname);
+        } catch (err) {
+          if (err.code === 'ENOENT') {
+            await fsp.mkdir(dirname);
+            console.log(`CHANGEPOOL created directory ${dirname}`);
+          }
+        }
+        await fsp.writeFile(newFilePath, image.toBuffer());
+        bytesWritten += image.toBuffer().length;
+        console.log(`CHANGEPOOL storing ${pad.id}:${attribNum} to ${newFilePath}`);
+
+        pad.pool.numToAttrib[attribNum] = [name, imageLink];
+        delete pad.pool.attribToNum[String(name, value)];
+        pad.pool.attribToNum[String(name, imageLink)] = attribNum;
+        console.log(`CHANGEPOOL changed attribute ${attribNum} of pad ${pad.id} to ${imageLink}`);
+      }
+    }
+    if (!foundImage) {
+      continue;
+    } else {
+      // construct the whole pad object
+      const dbObject = {};
+      const attributeBlackList = ['id'];
+      const jsonableList = ['pool'];
+
+      for (const attr in pad) {
+        if (typeof pad[attr] === 'function') continue;
+        if (attributeBlackList.indexOf(attr) !== -1) continue;
+
+        dbObject[attr] = pad[attr];
+
+        if (jsonableList.indexOf(attr) !== -1) {
+          dbObject[attr] = dbObject[attr].toJsonable();
+        }
+      }
+      await db.set(`pad:${pad.id}`, dbObject);
+      console.log(`CHANGEPOOL wrote pool of pad ${pad.id}`);
+
+      let keyRevs = [];
+      let poolsDeleted = 0;
+      for (let i=0;i < Math.round(headRev/100 + 1); i++) {
+        keyRevs.push(100 + 100*i);
+      }
+
+      // delete the pool from key revisions
+      for (const keyRev of keyRevs) {
+        if (waitDelay) {
+          await delay(waitDelay);
+        }
+        let revData = await db.get(`pad:${pad.id}:revs:${keyRev}`);
+        if (revData && revData.meta && revData.meta.pool) {
+          delete revData.meta.pool;
+          await db.set(`pad:${pad.id}:revs:${keyRev}`, revData);
+          poolsDeleted += 1;
+        }
+      }
+      if (poolsDeleted) {
+        console.log(`CHANGEPOOL pool of pad ${pad.id} was deleted from ${poolsDeleted} key revisions`);
+      }
+    }
+  }
+
+  if (bytesWritten > 0) {
+    console.log(`CHANGEPOOL stored images of size ${bytesWritten/1024/1024}MB to disk`);
+  }
+
+  await db.shutdown();
+  process.exit(0);
+})();
diff --git a/package-lock.json b/package-lock.json
index 844c109..a1d7d29 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,27 +5,27 @@
   "requires": true,
   "dependencies": {
     "@babel/code-frame": {
-      "version": "7.12.13",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.12.13.tgz",
-      "integrity": "sha512-HV1Cm0Q3ZrpCR93tkWOYiuYIgLxZXZFVG2VgK+MBWjUqZTundupbfx2aXarXuw5Ko5aMcjtJgbSs4vUGBS5v6g==",
+      "version": "7.12.11",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.12.11.tgz",
+      "integrity": "sha512-Zt1yodBx1UcyiePMSkWnU4hPqhwq7hGi2nFL1LeA3EUl+q2LQx16MISgJ0+z7dnmgvP9QtIleuETGOiOH1RcIw==",
       "dev": true,
       "requires": {
-        "@babel/highlight": "^7.12.13"
+        "@babel/highlight": "^7.10.4"
       }
     },
     "@babel/helper-validator-identifier": {
-      "version": "7.12.11",
-      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.12.11.tgz",
-      "integrity": "sha512-np/lG3uARFybkoHokJUmf1QfEvRVCPbmQeUQpKow5cQ3xWrV9i3rUHodKDJPQfTVX61qKi+UdYk8kik84n7XOw==",
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.14.5.tgz",
+      "integrity": "sha512-5lsetuxCLilmVGyiLEfoHBRX8UCFD+1m2x3Rj97WrW3V7H3u4RWRXA4evMjImCsin2J2YT0QaVDGf+z8ondbAg==",
       "dev": true
     },
     "@babel/highlight": {
-      "version": "7.12.13",
-      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.12.13.tgz",
-      "integrity": "sha512-kocDQvIbgMKlWxXe9fof3TQ+gkIPOUSEYhJjqUjvKMez3krV7vbzYCDq39Oj11UAVK7JqPVGQPlgE85dPNlQww==",
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.14.5.tgz",
+      "integrity": "sha512-qf9u2WFWVV0MppaL877j2dBtQIDgmidgjGk5VIMw3OadXvYaXn66U1BFlH2t4+t3i+8PhedppRv+i40ABzd+gg==",
       "dev": true,
       "requires": {
-        "@babel/helper-validator-identifier": "^7.12.11",
+        "@babel/helper-validator-identifier": "^7.14.5",
         "chalk": "^2.0.0",
         "js-tokens": "^4.0.0"
       },
@@ -40,33 +40,30 @@
             "escape-string-regexp": "^1.0.5",
             "supports-color": "^5.3.0"
           }
+        },
+        "escape-string-regexp": {
+          "version": "1.0.5",
+          "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
+          "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
+          "dev": true
         }
       }
     },
     "@eslint/eslintrc": {
-      "version": "0.3.0",
-      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.3.0.tgz",
-      "integrity": "sha512-1JTKgrOKAHVivSvOYw+sJOunkBjUOvjqWk1DPja7ZFhIS2mX/4EgTT8M7eTK9jrKhL/FvXXEbQwIs3pg1xp3dg==",
+      "version": "0.4.2",
+      "resolved": "https://registry.npmjs.org/@eslint/eslintrc/-/eslintrc-0.4.2.tgz",
+      "integrity": "sha512-8nmGq/4ycLpIwzvhI4tNDmQztZ8sp+hI7cyG8i1nQDhkAbRzHpXPidRAHlNvCZQpJTKw5ItIpMw9RSToGF00mg==",
       "dev": true,
       "requires": {
         "ajv": "^6.12.4",
         "debug": "^4.1.1",
         "espree": "^7.3.0",
-        "globals": "^12.1.0",
+        "globals": "^13.9.0",
         "ignore": "^4.0.6",
         "import-fresh": "^3.2.1",
         "js-yaml": "^3.13.1",
-        "lodash": "^4.17.20",
         "minimatch": "^3.0.4",
         "strip-json-comments": "^3.1.1"
-      },
-      "dependencies": {
-        "lodash": {
-          "version": "4.17.20",
-          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.20.tgz",
-          "integrity": "sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA==",
-          "dev": true
-        }
       }
     },
     "acorn": {
@@ -130,13 +127,13 @@
       "dev": true
     },
     "aws-sdk": {
-      "version": "2.413.0",
-      "resolved": "https://registry.npmjs.org/aws-sdk/-/aws-sdk-2.413.0.tgz",
-      "integrity": "sha1-ZcLb5T7LP5ZP2fGKhQ+PGtxV9Zg=",
+      "version": "2.928.0",
+      "resolved": "https://registry.npmjs.org/aws-sdk/-/aws-sdk-2.928.0.tgz",
+      "integrity": "sha512-1s2Vr+nfR+vSxXj6/cGvguwYWBLm+whGFMCSkzG8T3KyDN60YQn7Ljq3ry1bCqXV6Z9LSFDuKnkGEhtUJnaRHg==",
       "requires": {
-        "buffer": "4.9.1",
+        "buffer": "4.9.2",
         "events": "1.1.1",
-        "ieee754": "1.1.8",
+        "ieee754": "1.1.13",
         "jmespath": "0.15.0",
         "querystring": "0.2.0",
         "sax": "1.2.1",
@@ -148,25 +145,25 @@
         "uuid": {
           "version": "3.3.2",
           "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
-          "integrity": "sha1-G0r0lV6zB3xQHCOHL8ZROBFYcTE="
+          "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA=="
         }
       }
     },
     "balanced-match": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
-      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
+      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
       "dev": true
     },
     "base64-js": {
-      "version": "1.3.0",
-      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.3.0.tgz",
-      "integrity": "sha1-yrHmEY8FEJXli1KBrqjBzSK/wOM="
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
+      "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA=="
     },
     "bluebird": {
-      "version": "3.5.3",
-      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.3.tgz",
-      "integrity": "sha1-fQHG+WFsmlGrD4xUmnnf5uwz76c="
+      "version": "3.7.2",
+      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.7.2.tgz",
+      "integrity": "sha512-XpNj6GDQzdfW+r2Wnn7xiSAd7TM3jzkxGXBGTtWKuSXv1xUV+azxAm8jdWZN06QTQk+2N2XB9jRDkvbmQmcRtg=="
     },
     "brace-expansion": {
       "version": "1.1.11",
@@ -179,13 +176,20 @@
       }
     },
     "buffer": {
-      "version": "4.9.1",
-      "resolved": "https://registry.npmjs.org/buffer/-/buffer-4.9.1.tgz",
-      "integrity": "sha1-bRu2AbB6TvztlwlBMgkwJ8lbwpg=",
+      "version": "4.9.2",
+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-4.9.2.tgz",
+      "integrity": "sha512-xq+q3SRMOxGivLhBNaUdC64hDTQwejJ+H0T/NB1XMtTVEwNTrfFF3gAxiyW0Bu/xWEGhjVKgUcMhCrUy2+uCWg==",
       "requires": {
         "base64-js": "^1.0.2",
         "ieee754": "^1.1.4",
         "isarray": "^1.0.0"
+      },
+      "dependencies": {
+        "isarray": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
+          "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE="
+        }
       }
     },
     "busboy": {
@@ -195,29 +199,6 @@
       "requires": {
         "dicer": "0.2.5",
         "readable-stream": "1.1.x"
-      },
-      "dependencies": {
-        "isarray": {
-          "version": "0.0.1",
-          "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
-          "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8="
-        },
-        "readable-stream": {
-          "version": "1.1.14",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
-          "integrity": "sha1-fPTFTvZI44EwhMY23SB54WbAgdk=",
-          "requires": {
-            "core-util-is": "~1.0.0",
-            "inherits": "~2.0.1",
-            "isarray": "0.0.1",
-            "string_decoder": "~0.10.x"
-          }
-        },
-        "string_decoder": {
-          "version": "0.10.31",
-          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
-          "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ="
-        }
       }
     },
     "callsites": {
@@ -227,9 +208,9 @@
       "dev": true
     },
     "chalk": {
-      "version": "4.1.0",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.0.tgz",
-      "integrity": "sha512-qwx12AxXe2Q5xQ43Ac//I6v5aXTipYrSESdOgzrN+9XjgEpyjpKuvSGaN4qE93f7TQTlerQQ8S+EQ0EyDoVL1A==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.1.tgz",
+      "integrity": "sha512-diHzdDKxcU+bAsUboHLPEDQiw0qEe0qd7SYUn3HgcFlWgbDcfLGswOHYeGrHKzG9z6UYf01d9VFMfZxPM1xZSg==",
       "dev": true,
       "requires": {
         "ansi-styles": "^4.1.0",
@@ -336,29 +317,6 @@
       "requires": {
         "readable-stream": "1.1.x",
         "streamsearch": "0.1.2"
-      },
-      "dependencies": {
-        "isarray": {
-          "version": "0.0.1",
-          "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
-          "integrity": "sha1-ihis/Kmo9Bd+Cav8YDiTmwXR7t8="
-        },
-        "readable-stream": {
-          "version": "1.1.14",
-          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-1.1.14.tgz",
-          "integrity": "sha1-fPTFTvZI44EwhMY23SB54WbAgdk=",
-          "requires": {
-            "core-util-is": "~1.0.0",
-            "inherits": "~2.0.1",
-            "isarray": "0.0.1",
-            "string_decoder": "~0.10.x"
-          }
-        },
-        "string_decoder": {
-          "version": "0.10.31",
-          "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-0.10.31.tgz",
-          "integrity": "sha1-YuIDvEF2bGwoyfyEMB2rHFMQ+pQ="
-        }
       }
     },
     "doctrine": {
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-        "lodash": "^4.17.20",
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diff --git a/package.json b/package.json
index 9443005..1a0910f 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,8 @@
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