feat: integrate fix page size functionality into the workflow by extracting core logic to a utility and adding a new workflow node.

src/js/logic/fix-page-size-page.ts

@@ -1,6 +1,6 @@
 import { showAlert } from '../ui.js';
 import { downloadFile, formatBytes, hexToRgb } from '../utils/helpers.js';
-import { PDFDocument as PDFLibDocument, rgb, PageSizes } from 'pdf-lib';
+import { fixPageSize as fixPageSizeCore } from '../utils/pdf-operations';
 import { icons, createIcons } from 'lucide';
 import { FixPageSizeState } from '@/types';
 
@@ -31,7 +31,8 @@ async function updateUI() {
 
   if (pageState.file) {
     const fileDiv = document.createElement('div');
-        fileDiv.className = 'flex items-center justify-between bg-gray-700 p-3 rounded-lg text-sm';
+    fileDiv.className =
+      'flex items-center justify-between bg-gray-700 p-3 rounded-lg text-sm';
 
     const infoContainer = document.createElement('div');
     infoContainer.className = 'flex flex-col overflow-hidden';
@@ -66,7 +67,10 @@ async function updateUI() {
 function handleFileSelect(files: FileList | null) {
   if (files && files.length > 0) {
     const file = files[0];
-        if (file.type === 'application/pdf' || file.name.toLowerCase().endsWith('.pdf')) {
+    if (
+      file.type === 'application/pdf' ||
+      file.name.toLowerCase().endsWith('.pdf')
+    ) {
       pageState.file = file;
       updateUI();
     }
@@ -79,10 +83,20 @@ async function fixPageSize() {
     return;
   }
 
-    const targetSizeKey = (document.getElementById('target-size') as HTMLSelectElement).value;
+  const targetSize = (
-    const orientation = (document.getElementById('orientation') as HTMLSelectElement).value;
+    document.getElementById('target-size') as HTMLSelectElement
-    const scalingMode = (document.querySelector('input[name="scaling-mode"]:checked') as HTMLInputElement).value;
+  ).value;
-    const backgroundColor = hexToRgb((document.getElementById('background-color') as HTMLInputElement).value);
+  const orientation = (
+    document.getElementById('orientation') as HTMLSelectElement
+  ).value;
+  const scalingMode = (
+    document.querySelector(
+      'input[name="scaling-mode"]:checked'
+    ) as HTMLInputElement
+  ).value;
+  const backgroundColor = hexToRgb(
+    (document.getElementById('background-color') as HTMLInputElement).value
+  );
 
   const loaderModal = document.getElementById('loader-modal');
   const loaderText = document.getElementById('loader-text');
@@ -90,72 +104,43 @@ async function fixPageSize() {
   if (loaderText) loaderText.textContent = 'Standardizing pages...';
 
   try {
-        let targetWidth, targetHeight;
+    const customWidth =
-
+      parseFloat(
-        if (targetSizeKey === 'Custom') {
+        (document.getElementById('custom-width') as HTMLInputElement)?.value
-            const width = parseFloat((document.getElementById('custom-width') as HTMLInputElement).value);
+      ) || 210;
-            const height = parseFloat((document.getElementById('custom-height') as HTMLInputElement).value);
+    const customHeight =
-            const units = (document.getElementById('custom-units') as HTMLSelectElement).value;
+      parseFloat(
-
+        (document.getElementById('custom-height') as HTMLInputElement)?.value
-            if (units === 'in') {
+      ) || 297;
-                targetWidth = width * 72;
+    const customUnits =
-                targetHeight = height * 72;
+      (document.getElementById('custom-units') as HTMLSelectElement)?.value ||
-            } else {
+      'mm';
-                // mm
-                targetWidth = width * (72 / 25.4);
-                targetHeight = height * (72 / 25.4);
-            }
-        } else {
-            [targetWidth, targetHeight] = PageSizes[targetSizeKey as keyof typeof PageSizes];
-        }
-
-        if (orientation === 'landscape' && targetWidth < targetHeight) {
-            [targetWidth, targetHeight] = [targetHeight, targetWidth];
-        } else if (orientation === 'portrait' && targetWidth > targetHeight) {
-            [targetWidth, targetHeight] = [targetHeight, targetWidth];
-        }
 
     const arrayBuffer = await pageState.file.arrayBuffer();
-        const sourceDoc = await PDFLibDocument.load(arrayBuffer);
+    const pdfBytes = new Uint8Array(arrayBuffer);
-        const newDoc = await PDFLibDocument.create();
 
-        for (const sourcePage of sourceDoc.getPages()) {
+    const newPdfBytes = await fixPageSizeCore(pdfBytes, {
-            const { width: sourceWidth, height: sourceHeight } = sourcePage.getSize();
+      targetSize,
-            const embeddedPage = await newDoc.embedPage(sourcePage);
+      orientation,
-
+      scalingMode,
-            const newPage = newDoc.addPage([targetWidth, targetHeight]);
+      backgroundColor,
-            newPage.drawRectangle({
+      customWidth,
-                x: 0,
+      customHeight,
-                y: 0,
+      customUnits,
-                width: targetWidth,
-                height: targetHeight,
-                color: rgb(backgroundColor.r, backgroundColor.g, backgroundColor.b),
     });
 
-            const scaleX = targetWidth / sourceWidth;
-            const scaleY = targetHeight / sourceHeight;
-            const scale = scalingMode === 'fit' ? Math.min(scaleX, scaleY) : Math.max(scaleX, scaleY);
-
-            const scaledWidth = sourceWidth * scale;
-            const scaledHeight = sourceHeight * scale;
-
-            const x = (targetWidth - scaledWidth) / 2;
-            const y = (targetHeight - scaledHeight) / 2;
-
-            newPage.drawPage(embeddedPage, {
-                x,
-                y,
-                width: scaledWidth,
-                height: scaledHeight,
-            });
-        }
-
-        const newPdfBytes = await newDoc.save();
     downloadFile(
       new Blob([new Uint8Array(newPdfBytes)], { type: 'application/pdf' }),
       'standardized.pdf'
     );
-        showAlert('Success', 'Page sizes standardized successfully!', 'success', () => { resetState(); });
+    showAlert(
+      'Success',
+      'Page sizes standardized successfully!',
+      'success',
+      () => {
+        resetState();
+      }
+    );
   } catch (e) {
     console.error(e);
     showAlert('Error', 'An error occurred while standardizing pages.');
@@ -209,7 +194,10 @@ document.addEventListener('DOMContentLoaded', function () {
       const files = e.dataTransfer?.files;
       if (files && files.length > 0) {
         const pdfFiles = Array.from(files).filter(function (f) {
-                    return f.type === 'application/pdf' || f.name.toLowerCase().endsWith('.pdf');
+          return (
+            f.type === 'application/pdf' ||
+            f.name.toLowerCase().endsWith('.pdf')
+          );
         });
         if (pdfFiles.length > 0) {
           const dataTransfer = new DataTransfer();

src/js/logic/pdf-workflow-page.ts

@@ -1133,9 +1133,7 @@ function showNodeSettings(node: BaseWorkflowNode) {
       { label: 'Top Right', value: 'top-right' },
     ],
     orientation: [
-      { label: 'Vertical', value: 'vertical' },
+      { label: 'Auto (Keep Original)', value: 'auto' },
-      { label: 'Horizontal', value: 'horizontal' },
-      { label: 'Auto', value: 'auto' },
       { label: 'Portrait', value: 'portrait' },
       { label: 'Landscape', value: 'landscape' },
     ],
@@ -1160,6 +1158,23 @@ function showNodeSettings(node: BaseWorkflowNode) {
       { label: 'Letter', value: 'letter' },
       { label: 'Legal', value: 'legal' },
     ],
+    targetSize: [
+      { label: 'A4', value: 'A4' },
+      { label: 'Letter', value: 'Letter' },
+      { label: 'Legal', value: 'Legal' },
+      { label: 'A3', value: 'A3' },
+      { label: 'A5', value: 'A5' },
+      { label: 'Tabloid', value: 'Tabloid' },
+      { label: 'Custom', value: 'Custom' },
+    ],
+    scalingMode: [
+      { label: 'Fit (keep full page visible)', value: 'fit' },
+      { label: 'Fill (cover full target page)', value: 'fill' },
+    ],
+    customUnits: [
+      { label: 'Millimeters (mm)', value: 'mm' },
+      { label: 'Inches (in)', value: 'in' },
+    ],
     numberFormat: [
       { label: 'Simple (1, 2, 3)', value: 'simple' },
       { label: 'Page X of Y', value: 'page_x_of_y' },
@@ -1294,6 +1309,9 @@ function showNodeSettings(node: BaseWorkflowNode) {
       text: ['text'],
       area: ['x0', 'y0', 'x1', 'y1'],
     },
+    targetSize: {
+      Custom: ['customWidth', 'customHeight', 'customUnits'],
+    },
   };
 
   const controlWrappers: Record<string, HTMLElement> = {};

src/js/utils/pdf-operations.ts

@@ -1,4 +1,4 @@
-import { PDFDocument, degrees, rgb, StandardFonts } from 'pdf-lib';
+import { PDFDocument, degrees, rgb, StandardFonts, PageSizes } from 'pdf-lib';
 
 export async function mergePdfs(
   pdfBytesList: Uint8Array[]
@@ -438,3 +438,87 @@ export async function addPageNumbers(
 
   return new Uint8Array(await pdfDoc.save());
 }
+
+export interface FixPageSizeOptions {
+  targetSize: string;
+  orientation: string;
+  scalingMode: string;
+  backgroundColor: { r: number; g: number; b: number };
+  customWidth?: number;
+  customHeight?: number;
+  customUnits?: string;
+}
+
+export async function fixPageSize(
+  pdfBytes: Uint8Array,
+  options: FixPageSizeOptions
+): Promise<Uint8Array> {
+  let targetWidth: number;
+  let targetHeight: number;
+
+  if (options.targetSize.toLowerCase() === 'custom') {
+    const w = options.customWidth ?? 210;
+    const h = options.customHeight ?? 297;
+    const units = (options.customUnits ?? 'mm').toLowerCase();
+    if (units === 'in') {
+      targetWidth = w * 72;
+      targetHeight = h * 72;
+    } else {
+      targetWidth = w * (72 / 25.4);
+      targetHeight = h * (72 / 25.4);
+    }
+  } else {
+    const selected =
+      PageSizes[options.targetSize as keyof typeof PageSizes] || PageSizes.A4;
+    targetWidth = selected[0];
+    targetHeight = selected[1];
+  }
+
+  const orientation = options.orientation.toLowerCase();
+  if (orientation === 'landscape' && targetWidth < targetHeight) {
+    [targetWidth, targetHeight] = [targetHeight, targetWidth];
+  } else if (orientation === 'portrait' && targetWidth > targetHeight) {
+    [targetWidth, targetHeight] = [targetHeight, targetWidth];
+  }
+
+  const sourceDoc = await PDFDocument.load(pdfBytes);
+  const outputDoc = await PDFDocument.create();
+
+  for (const sourcePage of sourceDoc.getPages()) {
+    const { width: sourceWidth, height: sourceHeight } = sourcePage.getSize();
+    const embeddedPage = await outputDoc.embedPage(sourcePage);
+
+    const outputPage = outputDoc.addPage([targetWidth, targetHeight]);
+    outputPage.drawRectangle({
+      x: 0,
+      y: 0,
+      width: targetWidth,
+      height: targetHeight,
+      color: rgb(
+        options.backgroundColor.r,
+        options.backgroundColor.g,
+        options.backgroundColor.b
+      ),
+    });
+
+    const scaleX = targetWidth / sourceWidth;
+    const scaleY = targetHeight / sourceHeight;
+    const useFill = options.scalingMode.toLowerCase() === 'fill';
+    const scale = useFill ? Math.max(scaleX, scaleY) : Math.min(scaleX, scaleY);
+
+    const scaledWidth = sourceWidth * scale;
+    const scaledHeight = sourceHeight * scale;
+
+    const x = (targetWidth - scaledWidth) / 2;
+    const y = (targetHeight - scaledHeight) / 2;
+
+    outputPage.drawPage(embeddedPage, {
+      x,
+      y,
+      width: scaledWidth,
+      height: scaledHeight,
+    });
+  }
+
+  return new Uint8Array(await outputDoc.save());
+}

src/js/workflow/nodes/fix-page-size-node.ts

@@ -0,0 +1,104 @@
+import { ClassicPreset } from 'rete';
+import { BaseWorkflowNode } from './base-node';
+import { pdfSocket } from '../sockets';
+import type { SocketData } from '../types';
+import { requirePdfInput, processBatch } from '../types';
+import { fixPageSize } from '../../utils/pdf-operations';
+import { PDFDocument } from 'pdf-lib';
+import { hexToRgb } from '../../utils/helpers.js';
+
+export class FixPageSizeNode extends BaseWorkflowNode {
+  readonly category = 'Organize & Manage' as const;
+  readonly icon = 'ph-frame-corners';
+  readonly description = 'Standardize all pages to a target size';
+
+  constructor() {
+    super('Fix Page Size');
+    this.addInput('pdf', new ClassicPreset.Input(pdfSocket, 'PDF'));
+    this.addOutput(
+      'pdf',
+      new ClassicPreset.Output(pdfSocket, 'Standardized PDF')
+    );
+    this.addControl(
+      'targetSize',
+      new ClassicPreset.InputControl('text', { initial: 'A4' })
+    );
+    this.addControl(
+      'orientation',
+      new ClassicPreset.InputControl('text', { initial: 'auto' })
+    );
+    this.addControl(
+      'scalingMode',
+      new ClassicPreset.InputControl('text', { initial: 'fit' })
+    );
+    this.addControl(
+      'backgroundColor',
+      new ClassicPreset.InputControl('text', { initial: '#ffffff' })
+    );
+    this.addControl(
+      'customWidth',
+      new ClassicPreset.InputControl('number', { initial: 210 })
+    );
+    this.addControl(
+      'customHeight',
+      new ClassicPreset.InputControl('number', { initial: 297 })
+    );
+    this.addControl(
+      'customUnits',
+      new ClassicPreset.InputControl('text', { initial: 'mm' })
+    );
+  }
+
+  async data(
+    inputs: Record<string, SocketData[]>
+  ): Promise<Record<string, SocketData>> {
+    const pdfInputs = requirePdfInput(inputs, 'Fix Page Size');
+
+    const getText = (key: string, fallback: string) => {
+      const ctrl = this.controls[key] as
+        | ClassicPreset.InputControl<'text'>
+        | undefined;
+      return (ctrl?.value || fallback).trim();
+    };
+
+    const getNum = (key: string, fallback: number) => {
+      const ctrl = this.controls[key] as
+        | ClassicPreset.InputControl<'number'>
+        | undefined;
+      const value = ctrl?.value;
+      return Number.isFinite(value) ? (value as number) : fallback;
+    };
+
+    const targetSize = getText('targetSize', 'A4');
+    const orientation = getText('orientation', 'auto');
+    const scalingMode = getText('scalingMode', 'fit');
+    const backgroundHex = getText('backgroundColor', '#ffffff');
+    const customWidth = Math.max(1, getNum('customWidth', 210));
+    const customHeight = Math.max(1, getNum('customHeight', 297));
+    const customUnits = getText('customUnits', 'mm');
+    const backgroundColor = hexToRgb(backgroundHex);
+
+    return {
+      pdf: await processBatch(pdfInputs, async (input) => {
+        const resultBytes = await fixPageSize(input.bytes, {
+          targetSize,
+          orientation,
+          scalingMode,
+          backgroundColor,
+          customWidth,
+          customHeight,
+          customUnits,
+        });
+
+        const resultDoc = await PDFDocument.load(resultBytes);
+
+        return {
+          type: 'pdf',
+          document: resultDoc,
+          bytes: resultBytes,
+          filename: input.filename.replace(/\.pdf$/i, '_standardized.pdf'),
+        };
+      }),
+    };
+  }
+}

src/js/workflow/nodes/registry.ts

@@ -13,6 +13,7 @@ import { ReversePagesNode } from './reverse-pages-node';
 import { AddBlankPageNode } from './add-blank-page-node';
 import { DividePagesNode } from './divide-pages-node';
 import { NUpNode } from './n-up-node';
+import { FixPageSizeNode } from './fix-page-size-node';
 import { CombineSinglePageNode } from './combine-single-page-node';
 import { CropNode } from './crop-node';
 import { GreyscaleNode } from './greyscale-node';
@@ -298,6 +299,13 @@ export const nodeRegistry: Record<string, NodeRegistryEntry> = {
     description: 'Arrange multiple pages per sheet',
     factory: () => new NUpNode(),
   },
+  FixPageSizeNode: {
+    label: 'Fix Page Size',
+    category: 'Organize & Manage',
+    icon: 'ph-frame-corners',
+    description: 'Standardize all pages to a target size',
+    factory: () => new FixPageSizeNode(),
+  },
   CombineSinglePageNode: {
     label: 'Combine to Single Page',
     category: 'Organize & Manage',