All PDF Tools & Utilities
Select a utility from the left sidebar or the cards below. All diff algorithms, document transformations, and IRS tax forms execute 100% inside your browser's private memory sandbox with zero cloud uploads.
IRS Tax Form Fillers & Generators
New ModuleFill official IRS tax forms step-by-step with instant client-side PDF generation. Zero cloud data storage.
IRS Form W-8BEN Filler
Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding. For non-U.S. freelancers, creators, and contractors.
IRS Form W-9 Filler
Request for Taxpayer Identification Number and Certification. Enter your SSN/EIN securely to prevent backup withholding.
IRS Form SS-4 Filler (EIN)
Application for Employer Identification Number (EIN). Essential for new LLCs, corporations, and non-U.S. founders.
IRS Form W-8BEN-E Filler
Certificate of Status of Beneficial Owner for United States Tax Withholding (Entities). For foreign companies, SaaS, and Active NFFEs.
IRS Form W-4 Filler (Withholding)
Employee's Withholding Certificate. Configure personal info, multiple jobs, dependent credits, and extra withholding for payroll.
IRS Form W-7 Filler (ITIN)
Application for IRS Individual Taxpayer Identification Number. For foreign sellers, nonresident aliens, and international students.
PDF Comparison & Diff Utilities
Core EngineSide-by-side visual diffing, text redline comparator, and confidential legal contract auditing.
Compare PDF Documents Online
Compare two PDF documents side by side for discrepancies. Word-level redline highlighting, A/B swap, and zero-server privacy.
Compare Two PDF Files Online
Side-by-side authentic A4 document viewer with word-level Myers diff, synchronized dual scroll, and visual layout inspection.
Compare PDF Online
Side-by-side visual and textual document diffing with synchronized scrolling, difference count, and page heatmaps.
PDF Compare Online Tool
High-speed browser diffing engine for reviewing multi-page document revisions without server uploads.
Legal Contract & Agreement Diff
Specialized redline comparison for legal counsel and procurement. Detect altered indemnity clauses and sneakily modified terms.
Visual Layout & Drawing Diff
X-Ray pixel overlay slider for architectural CAD blueprints, marketing brochures, and typographic layout revisions.
Text Redline Comparator
Granular character and word-level diffing. Highlights additions in emerald green and deletions in red with strike-through.
PDF Converters & Formatters
Fast & PrivateTransform raw text, formatted notes, and code snippets into clean, paginated PDF documents.
Text to PDF Converter
Transform raw text files, Markdown notes, code snippets, and plain text into clean, formatted, paginated PDF documents.
Split PDF Pages Online Free
Extract specific pages, split by custom range, or slice entire documents into individual single-page PDFs with 1-click ZIP export.
PDF to PNG Converter
Convert PDF pages into high-resolution PNG images directly in your browser. 150/300 DPI vector rasterization, single-page export, and batch ZIP download.
HEIC to PDF Converter Online Free
Convert Apple iPhone .heic photos into clean, high-resolution PDF documents. 100% private in browser RAM with single-file merge or batch ZIP export.
PDF Stitcher Online Free
Stitch and merge multiple PDF documents into one, arrange pages 2-up side-by-side, or create continuous ribbons with 100% local RAM privacy.
PDF to Grayscale Online Free
Convert color PDF documents to 8-bit grayscale or high-contrast 1-bit monochrome black and white. 100% private in-browser engine with zero uploads.
Flatten PDF Online Free
Flatten PDF form fields, annotations, and layers into non-editable pages directly in browser memory. 100% private with zero server uploads.
Why Sensitive Records Never Touch Cloud Servers on PdfCompare
All algorithms, diff computations, and IRS tax forms execute inside your browser's private WebAssembly memory sandbox. No login required, free forever.