Scala PDF

All your PDF tasks, in one unified window

View, merge, split, compress, rotate pages, insert pages, and edit text directly inside your PDF. Every operation runs 100% offline on your machine with guaranteed privacy and zero risk of overwriting original files.

Version 1.4.1 · Windows 10/11 64-bit · 100% Free · No admin rights required

The Scala PDF window with multiple files open in tabs

7 essential tools, one seamless workflow

Intuitive and productive: drag and drop files, customize your options, and export results. Switch between tabs freely without losing document state or interrupting background tasks.

View documents

Open multiple PDF documents simultaneously in convenient sub-tabs, each automatically remembering its page position and zoom level. Handles documents spanning thousands of pages with ease thanks to intelligent viewport-based rendering.

  • Opens password-protected files securely. Passwords are held in memory during the active session only and deleted immediately when the application closes.
  • Instant task transition: The "Do more with this file" action sends your current document directly to Merge, Split, Compress, Rotate, Insert, or Edit Text without re-opening.
  • Easily verify completed outputs across any tab with the "View result" button.
The View tab with three files open as three sub-tabs

Merge documents

Combine unlimited PDF files into a single unified document with intuitive drag-and-drop reordering. Live page counts and file sizes are displayed clearly to help you inspect and organize files before merging.

  • Corrupted or password-locked files are highlighted in the list so you can resolve or exclude them prior to merging.
  • Built-in data safety: The application strictly prevents overwriting any of your original source files.
The Merge tab with three files in the list, six pages in total

Split documents

Two flexible splitting modes tailored to your workflow: extract custom page ranges (such as 1-5, 8, 10-12) into individual files, or split automatically by maximum file size — ideal for email attachments and portal upload limits.

  • Size-based splitting automatically calculates the optimal number of parts and warns you if any single page exceeds the target threshold.
  • Preview generated parts immediately. If cancelled midway, all successfully written sections remain safely preserved.
The Split tab in page-range mode with the ranges 1-2, 3

Compress & optimize

Reduce file size effortlessly with 3 balanced presets or fine-tune image resolution and compression quality manually. An interactive before/after split slider lets you compare visual clarity side-by-side alongside estimated file size savings.

  • Text-only documents and vector graphics are compressed losslessly with zero loss in visual sharpness.
  • Includes an option to convert scanned documents to grayscale for substantial additional size reduction.
The Compress tab with the before/after divider, estimating an 83% reduction

Rotate pages

Visual thumbnail grid of every page in your document. Rotate individual pages or the entire file in bulk, click to inspect in full detail, undo mistakes instantly, and export safely to a new PDF.

The Rotate tab with a grid of six pages, two of them marked for rotation

Insert & reorder

Combine documents with pinpoint accuracy: select your base file, add secondary documents, and specify exact insertion positions (after any designated page). A visual preview strip displays the resulting sequence, letting you discard unneeded pages with a click or restore them anytime.

The Insert tab with a three-page base file, a two-page inserted file and one dropped page

Edit text Beta

Direct in-place text editing: click any text line, enter your changes, and save to a new PDF. The rest of the document remains 100% pixel-perfect. Optimized for digital PDFs exported from Word, Excel, accounting systems, and digital invoices.

The Edit text tab with two edited lines on a quotation and the pending edits panel

Context-aware text editing — Preserving original document layouts

Scala PDF never destructively redraws the entire page. It intervenes strictly on the targeted line, automatically reflowing the paragraph according to the document's original font and alignment. When a paragraph expands or contracts, downstream elements shift dynamically to prevent text overlap.

Current capabilities

  • Add, delete, or replace text per line, or enable whole-paragraph editing mode. Apply multiple modifications across pages and commit them in a single batch.
  • Smart paragraph reflow: downstream content blocks (including signature boxes) shift automatically to keep layouts natural.
  • Preserved alignment: right-aligned lines (such as table balances or invoice totals) retain their right edge without crossing grid borders.
  • Smart font fallback: if an embedded font is unavailable on your system, the app recommends a compatible substitute and states the replacement clearly.
  • Transparent status reporting: each modification displays "Applied" or "Rejected" along with specific technical reasons. Your original file remains untouched.

Beta limitations

  • Does not support scanned documents (even with OCR), raster images, vector line art, handwritten signatures, or official stamps.
  • Does not support legacy character encodings (such as TCVN3 or VNI), angled/rotated text, or non-Latin scripts.
  • Does not support inserting extra lines into rigid table cells or fixed-frame forms; text does not overflow onto subsequent pages.
  • Does not support styling changes (bold, italic, font size) or inserting freeform text into blank areas with no existing lines.
  • Encrypted/password-locked PDFs cannot be edited. Digitally signed PDFs can be edited, but existing digital signatures will indicate document modification.

Why professionals choose Scala PDF

100% Offline — Absolute data privacy

Every operation runs locally on your PC using bundled tools with zero cloud uploads. Contracts, financial statements, and confidential internal files remain strictly on your machine.

Guaranteed non-destructive editing

Results are always exported to a separate, new file. The application strictly blocks accidental overwrites and never leaves corrupt partial files if you cancel midway.

Lightweight & zero admin rights required

A self-contained installer that requires no administrator privileges or extra dependencies — ready for instant deployment even on restricted corporate workstations.

Seamless automatic updates

Receive new features and stability improvements automatically. When an update is ready, the app notifies you and upgrades seamlessly on the next launch.

Download Scala PDF

A lightweight Windows package. Install in seconds and unlock all 7 tools immediately.

Released 2 October 2026 · Size 23 MB

First-time installation note: If Windows displays a SmartScreen dialog (as commercial code-signing certificates are pending), simply click More info and select Run anyway to continue.

System requirements

Operating system
Windows 10 or 11 (64-bit)
Privileges
No administrator rights required (installs safely for current user)
Dependencies
None. PDF processing engine and WebView2 runtime are bundled
Languages
English, Tiếng Việt
License
100% Free

Quick installation guide

Five straightforward steps in under a minute. No admin rights, zero extra software.

  1. Download installer

    Click Download Scala PDF for Windows to get the standalone .exe installer (~23 MB, typically stored in your Downloads folder).

  2. Launch setup

    Double-click the installer file. If a blue Windows SmartScreen protection prompt appears, click More info and then select Run anyway. This prompt appears only on initial install before commercial code certificates are attached.

  3. Select language

    In the first setup window, select English or Tiếng Việt. This choice configures both the installer and the application. You can toggle language anytime via the VI/EN button at the bottom-left corner.

  4. Complete installation

    The app installs locally into your user profile directory (%LOCALAPPDATA%\Scala PDF), allowing easy installation on managed corporate computers without admin credentials. Click Finish to open the app immediately.

  5. Start working

    Drag and drop any PDF file into the window or click the file picker to begin. In the future, launch the app directly from your Start menu by typing Scala PDF.

Automatic updates

No manual re-downloads required. When an update is released, the app prompts you and upgrades quietly on the next launch while retaining your personal settings.

Clean uninstallation

Navigate to Settings › Apps › Installed apps on Windows, select Scala PDF, and click Uninstall. All documents you previously created remain intact.

Frequently asked questions

Are my documents uploaded to any server or shared externally?

Absolutely not. All reading, processing, and exporting of PDF files occurs locally on your machine (100% offline). The app collects only minimal anonymous usage statistics (such as tool usage frequency) to guide feature improvements; file names, file paths, and document contents are never collected or transmitted.

Why does Windows SmartScreen display a prompt on first run?

Because the release is not yet signed with an expensive commercial EV certificate, Windows Defender SmartScreen displays a default safety prompt for newly downloaded files. Simply click "More info" and select "Run anyway" to proceed safely. Automated updates will not trigger this prompt again.

Is there a macOS or Linux version available?

Not at this time. Scala PDF is purpose-built and performance-optimized specifically for Windows 10 and 11 (64-bit). Support for macOS is currently being explored on our future roadmap.

Where can I report an issue or suggest an improvement?

You can contact us directly via email at minhnt.uit@gmail.com with the file name, source application, and a brief description of the issue. Security note: If the document contains confidential or sensitive information, please redact or sanitize the data before sending.