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Local PDF engine. Zero servers, absolute privacy.

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100% FREE • NO SIGN-UP • NO CREDIT CARD
001 / Direct visual editing
MOST USED

Edit PDF

Direct text editing, digital signatures, page numbering, and watermarks.

002 / Structure & page builder
ESSENTIAL

Organize PDF

Full structure management: merge multiple files, split by range, rotate and crop.

003 / High precision conversion
HIGH PRECISION

Convert PDF

High-precision bidirectional conversion between PDF and Word, Excel, PowerPoint, and images.

004 / Local security & compression
SAVE UP TO 90%

Optimize PDF

Local algorithms for size compression, security encryption, redaction, and repair.

000 / HOW PDFBLACK WORKS

Simple 4-Step Process

Absolute privacy guarantee. Your documents never leave your device or touch external servers.

001 / UPLOAD

1. Upload your PDF File

Drag your document into the dropzone or select it from your device. No sign-up or credit card needed.

002 / CATEGORY

2. Choose your Category

Select one of the 4 main buttons (Edit, Organize, Convert, or Optimize) depending on the tool group you need.

003 / EDITING

3. Work in Tool Sub-Page

You will be taken to your selected tool sub-page to customize, modify, and process your PDF live.

004 / DOWNLOAD

4. Download your Ready PDF

Get your modified document immediately with a single click, 100% private and ready to use.

TECHNICAL & SECURITY GUIDE

What happens to your PDF in each tool group?

Absolute transparency. Discover in detail what happens inside your browser when processing documents.

001 / DIRECT EDITING

EDIT PDF Group

Visual Editing
Binary Process & Security in EDIT:

When editing, the PDF decodes into objects inside isolated browser RAM. Text edits, watermarks, page numbers, or drawn signatures embed as clean native vector streams under PDF 1.7 standard.

In OCR, character recognition runs via local WebAssembly models analyzing image pixels with zero external API calls. Your original file remains untouched on your drive.

  • Edit Text: Inserts native text adjusting fonts and alignment.
  • Page Numbers: Adds automated sequential page numbers.
  • Watermarks: Applies security stamps or text across pages.
  • Sign & OCR: Stamps drawn signatures and turns scanned images into text.
View Edit tools →
002 / STRUCTURE

ORGANIZE PDF Group

Page Builder
Binary Process & Security in ORGANIZE:

Organize tools modify the document PageTree catalog in RAM. When reordering, rotating, cropping, or splitting, only logical pointers update without re-encoding images or reducing vector quality.

When merging multiple files, shared resource tables merge into a unified PDF container at max local CPU speed, ensuring blueprints and images retain 100% sharpness.

  • Merge PDF: Merges page trees from multiple PDFs without resolution loss.
  • Split & Delete: Splits by exact page ranges or removes unnecessary pages.
  • Reorder & Rotate: Drag page thumbnails and adjust angles to 90°/180°.
  • Crop Margins: Crops document margins to standard dimensions.
View Organize tools →
003 / CONVERSION

CONVERT PDF Group

High Precision
Binary Process & Security in CONVERT:

The client-side conversion engine parses spatial coordinates (`x, y, z`) of text, table cells, and images from the PDF, recompiling them into OpenXML structures (DOCX, XLSX, PPTX) in real-time.

No intermediate cloud servers or third-party APIs process your financial sheets or contracts. Parsing and ZIP generation happen inside private browser memory.

  • PDF ↔ Word: Converts paragraphs and formatting into editable DOCX.
  • PDF ↔ Excel: Extracts data tables directly into XLSX spreadsheets.
  • PDF ↔ PowerPoint: Transforms pages into PPTX slides.
  • PDF ↔ Images / HTML / TXT: Exports pages into HD images, web code, or text.
View Convert tools →
004 / OPTIMIZATION

OPTIMIZE PDF Group

Security & Size
Binary Process & Security in OPTIMIZE:

Optimizes binary data streams in memory. Compression re-encodes heavy JPEG images via Canvas resampling and purges redundant XRef metadata. Encryption runs native **AES-256** cryptography (`crypto.subtle`) without sending passwords online.

In redaction, confidential text is permanently erased from the document binary code (unlike overlaying editable black boxes). Repair rebuilds corrupt headers and dictionaries.

  • Compress PDF: Reduces file size up to 90% keeping text clear.
  • Repair PDF: Rebuilds XRef tables and fixes corrupt files.
  • Protect & Unlock: Encrypts with password or removes local passwords.
  • Redact & Compare: Redacts private data or compares PDFs visually.
View Optimize tools →

005 / RECENT FILES

FILE NAMESIZEACTION PERFORMEDSTATUSACTIONS
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001 / 100% Free local PDF engine
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