Convert Letter to A4 PDF Online Free
Resize North American US Letter (8.5 × 11 in) documents to international ISO 216 A4 (210 × 297 mm). 100% private in-browser conversion with zero uploads.
Drag & drop your PDF file here, or click to browse
Drop your US Letter PDF here to instantly resize to A4 (210 × 297 mm)
Max file size: 50MB
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Upload a PDF file to customize page dimensions and configure scaling.
US Letter vs. A4: Exact Dimensional Specs
Understand the physical paper proportions before printing or sharing
US Letter
A4
How to Convert US Letter to A4 PDF Without Cutting Off Margins
Standardizing US Letter documents for European, Asian, and global distribution requires converting to ISO 216 A4. Because US Letter is 5.9 mm wider than A4, printing an unscaled Letter document on standard A4 paper causes side margins, tables, and wide headers to spill past the paper edge.
Upload US Letter Document
Drag and drop your file above. Multi-page documents and files up to 50MB are processed instantly inside your local browser memory.
Target Standard: A4
The resizer automatically locks to A4 (210 × 297 mm). You can inspect page layout using the live interactive preview.
Select Fit & Scale
Select Fit & Scale (Proportional) to resize content with balanced margin padding, preventing office printers from trimming footers or headers.
Instant Client-Side Download
Click "Resize and Download PDF". All text vectors, font types, and image resolutions are preserved with zero quality degradation.
🛠️ Professional Formatting Recommendation
Target Use Case & Industry Standards
Crucial for US companies emailing contracts, invoices, and product specification sheets to European or Asian clients who print on standard A4 office copiers.
Why BrowserPowerToys is the Superior Choice for PDF Resizing
- 100% Private & Serverless: Unlike traditional cloud converter websites, BrowserPowerToys executes all vector transformations directly on your device. Your sensitive financial, medical, and legal documents never leave your computer.
- Crisp Vector Sharpness: We use Form XObject vector scaling rather than converting your pages into blurry bitmap raster images. Text remains crisp at any zoom level.
- Zero Paywalls or Watermarks: Convert unlimited pages and documents with zero watermarks, zero subscription prompts, and zero required account sign-ups.
- Universal Offline Capability: Works fully offline as a Progressive Web App (PWA). No active internet connection needed after initial page load.
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Frequently Asked Questions
Everything you need to know about processing files securely in your browser
Why does printing a US Letter PDF in Europe cut off the sides?
International standard paper (A4) is 5.9 mm (0.23 in) narrower than US Letter. If an unscaled US Letter document is printed on an A4 printer, the left and right margins or wide financial spreadsheets are clipped.
What is the difference between US Letter and A4?
US Letter measures 215.9 × 279.4 mm (8.5 × 11 in), while A4 measures 210 × 297 mm (8.27 × 11.69 in). Letter is wider; A4 is taller.
Can I resize specific pages of my PDF to A4 while keeping others Letter size?
Yes! Under Apply to Pages, select Custom Range... and specify the page numbers (e.g. 1-3, 5) to convert only target sheets while keeping the rest untouched.
Will my converted PDF work with international A4 ring binders?
Yes. Centering the content with Fit & Scale ensures sufficient inner margin space for standard 2-hole and 4-hole European binder punches without punching holes through body text.