Add local PDF compression and improve PDF editing UX

.github/workflows/ci.yml

@@ -15,6 +15,7 @@ jobs:
           node-version: 24
           cache: npm
       - run: npm ci
+      - run: npm audit --omit=dev --audit-level=high
       - run: npm run privacy-check
       - run: npm run lint
       - run: npm run typecheck

.gitignore

@@ -17,6 +17,10 @@
 /.next/
 /out/
 
+# generated browser runtime assets
+/public/qpdf/
+/public/pdfjs/
+
 # production
 /build
 

README.md

@@ -16,8 +16,10 @@ ToolStack is an open-source collection of utilities designed around a strict loc
 ## Highlights
 
 ### PDF & Documents
-- PDF Toolkit: merge PDFs, reorder merge inputs, extract/reorder/delete/rotate pages, split every page to ZIP, edit basic metadata and turn images into a PDF.
-- PDF operations run in-browser with bundled `pdf-lib`; ToolStack does not claim secure redaction or general PDF compression.
+- PDF Toolkit: compress PDFs, merge and reorder merge inputs, remove accidental uploads, select which loaded PDF to edit, extract/reorder/delete/rotate pages, split every page to ZIP, edit basic metadata and turn images into a PDF.
+- Lossless PDF compression runs in-browser with bundled qpdf WebAssembly and preserves document structure, selectable text, links and forms.
+- Balanced and Strong compression use bundled PDF.js to render pages locally and rebuild them as JPEG-backed PDF pages. This can produce much larger reductions for scans/image-heavy files, but intentionally flattens the document: selectable text, links, forms, bookmarks, accessibility structure and digital signatures are not preserved.
+- Other PDF editing operations use bundled `pdf-lib`. ToolStack does not claim secure redaction.
 
 ### Privacy & Security
 Image Metadata Remover, Data Anonymizer, File Hash & Checksum, Tracking URL Cleaner, Password & Passphrase Generator, JWT Inspector, Browser Privacy Inspector, Text Privacy Cleaner, AES-GCM File Encryption, File Type & Signature Inspector, Content Credentials (C2PA) Inspector, and HMAC Generator & Verifier.

package.json

@@ -1,9 +1,12 @@
 {
   "name": "toolstack",
-  "version": "0.3.0",
+  "version": "0.3.1",
   "private": true,
   "scripts": {
+    "prepare-qpdf-assets": "node scripts/copy-qpdf-assets.mjs",
+    "predev": "npm run prepare-qpdf-assets",
     "dev": "next dev",
+    "prebuild": "npm run prepare-qpdf-assets",
     "build": "next build",
     "start": "next start",
     "lint": "eslint .",
@@ -23,8 +26,10 @@
     "next": "16.3.4",
     "papaparse": "^5.5.3",
     "pdf-lib": "^1.17.1",
+    "pdfjs-dist": "^6.3.289",
     "piexifjs": "^1.0.6",
     "postcss-selector-parser": "^7.1.6",
+    "qpdf-run": "^0.2.1",
     "react": "^19.2.8",
     "react-dom": "^19.2.8",
     "react-image-crop": "^11.0.10",