Resize PDF
Files
Select a PDF and choose target page size, orientation, and margin settings.
Drop files here or
Accepted: PDF
All processing happens in your browser — your files are never uploaded to a server.
About this Tool
Easily resize and scale PDF pages to standard paper formats like A4, A3, B5, or US Letter. Automatically adapt presentation slide decks (PowerPoint/Keynote 16:9) to landscape/portrait print dimensions with configurable 0-15mm safety margins in a secure 100% browser-side sandbox.
100% Secure Local Processing Active
This tool runs entirely on your device via WebAssembly and browser Canvas. No files are ever sent to any remote server, ensuring complete data security.
How to Use
Upload the PDF file (document scan, presentation slide, or report) into the workspace.
Choose your target paper size (A4, Letter, A3, B5, Legal), orientation mode (Auto Detect, Portrait, Landscape), and margin preferences.
Click the resize button to instantly download your perfectly proportioned PDF.
Core Scenarios
Adapting PPT & Keynote Slide PDFs to Standard A4 Printing
Scale 16:9 widescreen presentation slides seamlessly to A4 Landscape (297×210mm) printable dimensions without awkward top/bottom letterboxing.
Converting Overseas US Letter Drafts to Standard A4
Adjust Letter-sized international drafts to standard A4 specifications to eliminate text clipping when printing on domestic office printers.
Downscaling Oversized A3/B4 Blueprints to A4 Handouts or B5 Booklets
Scale large engineering diagrams or quarterly strategy charts down to standard A4 page metrics, or resize to B5/A5 for academic publication drafts.
Adjusting Page Margins for Ring Binding & Punching
Uniformly add 5mm to 15mm safety margins around page borders so that 3-ring hole punching or spiral binding never obscures body copy.
Frequently Asked Questions
No. The auto-detect orientation mode preserves exact aspect ratios, scaling wide slides into A4 landscape (297×210mm) without stretching or distortion.
Yes. The intelligent Auto Detect mode recognizes each page's native orientation individually, formatting horizontal pages to A4 landscape and vertical pages to A4 portrait.
No. PDF vector typography and coordinate systems recalculate mathematically, ensuring crisp lines and crystal-clear text edges at any target scale.
Yes. 100% of the PDF manipulation runs locally inside your browser via WebAssembly, guaranteeing total privacy for sensitive business documents.
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