# PDF RTL/LTR Support Tester (PDF双向文字测试) Preview left-to-right and right-to-left text flow in PDF with bidi reordering > Canonical page: https://elysiatools.com/en/tools/pdf-rtl-ltr-support - **Category:** Document Tools - **Keywords:** pdf, rtl, ltr, bidi, arabic, hebrew, direction, text, 双向, 排版 ## Overview Test bidirectional text flow by rendering LTR and RTL samples side by side. **Features:** - Bidi reordering with RTL detection or manual direction - Alignment and spacing controls - Optional guide lines to inspect layout - Mixed-direction sample line ## Inputs - **LTR Text** (textarea): Enter left-to-right text... - **RTL Text** (textarea): أدخل نصًا من اليمين إلى اليسار... - **Base Direction** (select) - **Alignment** (select) - **Font Size (pt)** (number) - **Line Height** (number) - **Page Size** (select) - **Top Margin (pt)** (number) - **Bottom Margin (pt)** (number) - **Left Margin (pt)** (number) - **Right Margin (pt)** (number) - **Show Guides** (checkbox) - **Include Mixed Sample** (checkbox) - **Font File (Optional)** (file): Upload a font file for RTL scripts... ## When to use - Verifying layout consistency for documents containing both LTR and RTL languages. - Troubleshooting bidi reordering issues in PDF generation workflows. - Testing custom font rendering for right-to-left scripts before final production. ## How it works - Input your LTR and RTL text samples into the respective fields. - Adjust the base direction, alignment, and typography settings to match your document requirements. - Toggle guide lines or include mixed-direction samples to inspect the visual layout. - Generate and download the PDF to review the final bidi reordering and spacing. ## Use cases - Validating multilingual document templates for international business reports. - Debugging text direction errors in automated PDF generation pipelines. - Creating visual proofs for designers working with mixed-script typography. ## Frequently asked questions ### What is bidi reordering? Bidi (bidirectional) reordering is the process of arranging text characters in the correct visual order when a document contains both left-to-right and right-to-left scripts. ### Can I use my own fonts? Yes, you can upload a custom TTF or OTF font file to ensure specific RTL scripts render correctly in your PDF preview. ### Does this tool support mixed-direction text? Yes, you can enable the 'Include Mixed Sample' option to see how the PDF engine handles lines containing both LTR and RTL characters. ### What page sizes are supported? The tool supports standard A4, Letter, and Legal page sizes for your layout testing. ### How do I ensure the text aligns correctly? 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