diff --git a/cli/src/index.js b/cli/src/index.js
index 6d1303ef..bdc148e1 100644
--- a/cli/src/index.js
+++ b/cli/src/index.js
@@ -13,6 +13,19 @@ import WorkerPool from "./worker_pool.js";
 import ImageData from "./image_data.js";
 globalThis.ImageData = ImageData;
 
+function clamp(v, min, max) {
+  if (v < min) return min;
+  if (v > max) return max;
+  return v;
+}
+
+const suffix = ["B", "KB", "MB"];
+function prettyPrintSize(size) {
+  const base = Math.floor(Math.log2(size) / 10);
+  const index = clamp(base, 0, 2);
+  return (size / 2 ** (10 * index)).toFixed(2) + suffix[index];
+}
+
 async function decodeFile(file) {
   const buffer = await fsp.readFile(file);
   const firstChunk = buffer.slice(0, 16);
@@ -28,7 +41,111 @@ async function decodeFile(file) {
   const rgba = (await supportedFormats[key].dec()).decode(
     new Uint8Array(buffer)
   );
-  return rgba;
+  return {
+    file,
+    bitmap: rgba,
+    size: buffer.length
+  };
+}
+
+async function encodeFile({
+  file,
+  size,
+  bitmap,
+  outputFile,
+  encName,
+  encConfig
+}) {
+  const encoder = await supportedFormats[encName].enc();
+  const out = encoder.encode(
+    bitmap.data.buffer,
+    bitmap.width,
+    bitmap.height,
+    encConfig
+  );
+  await fsp.writeFile(outputFile, out);
+  return {
+    inputSize: size,
+    inputFile: file,
+    outputFile,
+    outputSize: out.length
+  };
+}
+
+async function processFiles(files) {
+  // Create output directory
+  await fsp.mkdir(program.outputDir, { recursive: true });
+  const workerPool = new WorkerPool(cpus().length, __filename);
+
+  const decodedFiles = await Promise.all(files.map(file => decodeFile(file)));
+
+  let jobsStarted = 0;
+  let jobsFinished = 0;
+  for (const { file, bitmap, size } of decodedFiles) {
+    const ext = extname(file);
+    const base = basename(file, ext);
+
+    for (const [encName, value] of Object.entries(supportedFormats)) {
+      if (!program[encName]) {
+        continue;
+      }
+      const encConfig = Object.assign(
+        {},
+        value.defaultEncoderOptions,
+        JSON5.parse(program[encName])
+      );
+      const outputFile = join(program.outputDir, `${base}.${value.extension}`);
+      jobsStarted++;
+      workerPool
+        .dispatchJob({
+          file,
+          size,
+          bitmap,
+          outputFile,
+          encName,
+          encConfig
+        })
+        .then(({ outputFile, inputSize, outputSize }) => {
+          jobsFinished++;
+          const numDigits = jobsStarted.toString().length;
+          console.log(
+            `${jobsFinished
+              .toString()
+              .padStart(
+                numDigits
+              )}/${jobsStarted}: ${outputFile} ${prettyPrintSize(
+              inputSize
+            )} -> ${prettyPrintSize(outputSize)} (${(
+              (outputSize / inputSize) *
+              100
+            ).toFixed(1)}%)`
+          );
+        });
+    }
+  }
+  // Wait for all jobs to finish
+  await workerPool.join();
+}
+
+if (isMainThread) {
+  program
+    .name("squoosh-cli")
+    .version(version)
+    .arguments("<files...>")
+    .option("-d, --output-dir <dir>", "Output directory", ".")
+    .action(processFiles);
+
+  // Create a CLI option for each supported encoder
+  for (const [key, value] of Object.entries(supportedFormats)) {
+    program.option(
+      `--${key} [config]`,
+      `Use ${value.name} to generate a .${value.extension} file with the given configuration`
+    );
+  }
+
+  program.parse(process.argv);
+} else {
+  WorkerPool.useThisThreadAsWorker(encodeFile);
 }
 
 /*
@@ -81,73 +198,3 @@ const visdifModule = require("../codecs/visdif/visdif.js");
     attempts
   };
 }*/
-
-async function processFiles(files) {
-  // Create output directory
-  await fsp.mkdir(program.outputDir, { recursive: true });
-  const workerPool = new WorkerPool(cpus().length, __filename);
-
-  for (const file of files) {
-    const ext = extname(file);
-    const base = basename(file, ext);
-    const bitmap = await decodeFile(file);
-
-    for (const [encName, value] of Object.entries(supportedFormats)) {
-      if (!program[encName]) {
-        continue;
-      }
-      const encConfig = Object.assign(
-        {},
-        value.defaultEncoderOptions,
-        JSON5.parse(program[encName])
-      );
-      const outputFile = join(program.outputDir, `${base}.${value.extension}`);
-      workerPool
-        .dispatchJob({
-          bitmap,
-          outputFile,
-          encName,
-          encConfig
-        })
-        .then(({ outputSize }) => {
-          console.log(`Written ${file}. Size: ${outputSize}`);
-        });
-    }
-  }
-  // Wait for all jobs to finish
-  await workerPool.join();
-}
-
-if (isMainThread) {
-  program
-    .name("squoosh-cli")
-    .version(version)
-    .arguments("<files...>")
-    .option("-d, --output-dir <dir>", "Output directory", ".")
-    .action(processFiles);
-
-  // Create a CLI option for each supported encoder
-  for (const [key, value] of Object.entries(supportedFormats)) {
-    program.option(
-      `--${key} [config]`,
-      `Use ${value.name} to generate a .${value.extension} file with the given configuration`
-    );
-  }
-
-  program.parse(process.argv);
-} else {
-  WorkerPool.useThisThreadAsWorker(
-    async ({ id, bitmap, outputFile, encName, encConfig }) => {
-      console.log("received", { outputFile, encName });
-      const encoder = await supportedFormats[encName].enc();
-      const out = encoder.encode(
-        bitmap.data.buffer,
-        bitmap.width,
-        bitmap.height,
-        encConfig
-      );
-      await fsp.writeFile(outputFile, out);
-      return { outputSize: out.length };
-    }
-  );
-}