--- title: "Handling non-Latin fonts, standard fonts, and JPEG 2000 in react-pdf" canonical_url: "https://www.nutrient.io/blog/react-pdf-non-latin-fonts-special-pdfs/" md_url: "https://www.nutrient.io/blog/react-pdf-non-latin-fonts-special-pdfs.md" last_updated: "2026-09-15T10:47:28.616Z" description: "Learn how to configure react-pdf for CJK character maps, standard PDF fonts, JPEG 2000 WASM decoding, and authenticated PDF endpoints using the options prop." --- **TL;DR** - Pass extra PDF.js resources through the `options` prop on `` — `cMapUrl` (CJK text), `standardFontDataUrl` (non-embedded fonts), `wasmUrl` (JPEG 2000 images), and `httpHeaders`/`withCredentials` (authentication). - Self-host the files in production. Content delivery network (CDN) URLs are fine for prototyping but introduce CSP and supply-chain risk. - Memoize the `options` object — `` compares it with `===`, so a fresh object on every render kicks off a reload. - `wasmUrl` is a PDF.js v5+ option; older versions fall back to the bundled JavaScript decoder. Some PDFs require additional resources to render correctly: character maps for CJK text, standard font data for older PDFs, and WebAssembly (WASM) decoders for JPEG 2000 images. `react-pdf` passes these through to PDF.js via the `options` prop. ## CMap support (non-Latin characters) PDFs with Chinese, Japanese, Korean, or other non-Latin characters need Character Map (CMap) files for correct text rendering. ### Option A: Copy CMaps to public directory Copy the CMap files from `pdfjs-dist` into your build output: ```bash cp -r node_modules/pdfjs-dist/cmaps public/cmaps ``` Then configure: ```tsx const options = { cMapUrl: "/cmaps/", cMapPacked: true, }; ``` `cMapPacked` defaults to `true` in current PDF.js versions, but older versions defaulted to `false`. Setting it explicitly avoids surprises across upgrades. ### Option B: Use CDN Skip the copy step and load the CMap files directly from a CDN instead: ```tsx import { pdfjs } from "react-pdf"; const options = { cMapUrl: `https://unpkg.com/pdfjs-dist@${pdfjs.version}/cmaps/`, cMapPacked: true, }; ``` CDN URLs (`unpkg.com`, `jsdelivr.net`) are convenient for prototyping but risky in production — they introduce supply-chain attack surface, can be blocked by strict CSP policies, and add a third-party dependency to your uptime. Self-host the files from `node_modules/pdfjs-dist/` for anything user-facing. ### Build tool integration These bundlers support copy plugins: **Vite:** ```js // vite.config.js import { viteStaticCopy } from "vite-plugin-static-copy"; export default { plugins: [ viteStaticCopy({ targets: [ { src: "node_modules/pdfjs-dist/cmaps/*", dest: "cmaps", }, ], }), ], }; ``` **webpack (`CopyPlugin`):** ```js const CopyPlugin = require("copy-webpack-plugin"); module.exports = { plugins: [ new CopyPlugin({ patterns: [ { from: "node_modules/pdfjs-dist/cmaps", to: "cmaps" }, ], }), ], }; ``` ## Standard fonts Older or non-PDF/A PDFs may reference the 14 “standard fonts” (Helvetica, Times-Roman, Courier, etc.) by name instead of embedding them. PDF 2.0 (2017) requires fonts to be embedded, and PDF/A has required it since 2005 — but plenty of in-the-wild files still skip embedding. Without `standardFontDataUrl`, PDF.js can’t substitute and the text renders incorrectly. ### Setup Copy the standard fonts directory: ```bash cp -r node_modules/pdfjs-dist/standard_fonts public/standard_fonts ``` Configure: ```tsx const options = { standardFontDataUrl: "/standard_fonts/", }; ``` Or use CDN: ```tsx const options = { standardFontDataUrl: `https://unpkg.com/pdfjs-dist@${pdfjs.version}/standard_fonts/`, }; ``` ## JPEG 2000 support (WASM) Some PDFs use JPEG 2000 compression for images. PDF.js can decode these using a WebAssembly module. `wasmUrl` is a PDF.js v5+ option. On v4 and earlier, JPEG 2000 falls back to the bundled JavaScript decoder — the option is silently ignored, so don’t expect a speedup unless you’ve upgraded. ### Setup Copy the WASM files: ```bash cp -r node_modules/pdfjs-dist/wasm public/wasm ``` Configure: ```tsx const options = { wasmUrl: "/wasm/", }; ``` ## Combined configuration A production setup typically includes all three: ```tsx import { pdfjs } from "react-pdf"; // Define outside component to avoid re-creation. const options = { cMapUrl: `https://unpkg.com/pdfjs-dist@${pdfjs.version}/cmaps/`, standardFontDataUrl: `https://unpkg.com/pdfjs-dist@${pdfjs.version}/standard_fonts/`, wasmUrl: "/wasm/", }; function PDFViewer({ file }) { return ( ); } ``` **Remember:** The `options` object must be defined outside the component or memoized with `useMemo`. It uses `===` equality like the `file` prop. ## Custom HTTP headers For authenticated PDF endpoints, pass headers via `options`: ```tsx const options = useMemo( () => ({ httpHeaders: { Authorization: `Bearer ${token}`, }, withCredentials: true, }), [token], ); ``` ## When do you need these? | Resource | When needed | Symptom without it | | -------------- | --------------------------- | ------------------------------------- | | CMaps | PDF has CJK text | Characters render as blank/garbled | | Standard fonts | PDF doesn’t embed all fonts | Text appears in wrong font or missing | | WASM | PDF has JPEG 2000 images | Images don’t render (PDF.js v5+ only) | | HTTP headers | Authenticated endpoints | 401/403 errors | Most modern PDFs embed everything they need. You can start without these and add them when you encounter rendering issues. ## Key points - All special resource paths go through the `options` prop on `Document`. - CDN paths are the easiest setup — no build tool configuration needed. - For production, self-host the files for reliability and CSP compliance. - Memoize the `options` object to avoid unnecessary rerenders. - `httpHeaders` and `withCredentials` also go in `options`. - Most PDFs work without any of these — add them when you see rendering issues. ## How Nutrient Web SDK handles this All the CMap configuration, standard font paths, WASM decoder setup, and build tool plugins shown above are unnecessary with Nutrient Web SDK: ```js // No CMap files, no standard fonts, no WASM decoder, no HTTP headers config. const instance = await NutrientViewer.load({ container: "#pdf-container", document: "document.pdf", // CJK fonts, standard fonts, JPEG 2000 — all handled internally. }); ``` You don’t need `cMapUrl`, `standardFontDataUrl`, or `wasmUrl` in `options`, and no Vite/webpack copy plugins are required. Nutrient bundles all font rendering, CMap support, and image decoders internally. CJK text, legacy PDFs, and JPEG 2000 images render correctly out of the box — in any framework, with zero configuration. [Learn more about Nutrient Web SDK](https://www.nutrient.io/sdk/web-overview/) | [Migration guide](https://www.nutrient.io/guides/web/about/migration-guides/migrating-from-react-pdf.md) | [Contact Sales](https://www.nutrient.io/contact-sales/?=sdk) ## FAQ #### Why is my Chinese/Japanese/Korean PDF rendering as blank squares? PDF.js needs CMap files to map CJK character codes to glyphs. Set `cMapUrl` in the `options` prop — either pointing at a self-hosted `/cmaps/` directory or, for prototyping, a CDN URL. Also set `cMapPacked: true` for binary `.bcmap` files (the default in current PDF.js). #### Do I need standardFontDataUrl for every PDF? No — it’s only needed for PDFs that don’t embed their fonts. PDF/A and PDF 2.0 require embedding, so compliant files don’t need it. Older or non-compliant files that reference the 14 base fonts (Helvetica, Times-Roman, Courier, etc.) by name do. #### Does setting wasmUrl improve performance? It only improves performance on PDF.js v5 or later, and only for PDFs containing JPEG 2000 images. On older versions, the option is silently ignored and decoding falls back to the bundled JavaScript decoder. If you’ve set `wasmUrl` and see no difference, check your PDF.js version first. #### Should I use the unpkg CDN URLs in production? No. CDN URLs add a third-party dependency, expand your supply-chain attack surface, and may be blocked by strict CSP policies. Use them for prototyping or internal tools. For production, copy the files out of `node_modules/pdfjs-dist/` at build time with `vite-plugin-static-copy` or `copy-webpack-plugin`. #### Why does my PDF reload every render even though the file hasn’t changed? The `options` prop is compared by reference (`===`). If you inline it as ``, every render produces a fresh object and `react-pdf` reloads the document. Hoist `options` outside the component, or wrap it in `useMemo`. #### How do I pass an authentication token that changes over time? Wrap the `options` object in `useMemo` keyed on the token, as shown in the [custom HTTP headers](#custom-http-headers) section. When the token rotates, the memo recomputes, `react-pdf` sees a new `options` reference, and `react-pdf` refetches with the updated `Authorization` header. --- ## Related pages - [The business case for accessibility: Five ways it drives enterprise value](/blog/5-ways-accessibility-drives-enterprise-value.md) - [Accessibility Untangled Why It Matters Guide](/blog/accessibility-untangled-why-it-matters-guide.md) - [Advanced Techniques For React Native Ui Components](/blog/advanced-techniques-for-react-native-ui-components.md) - [`vector_store` holds your indexed documents (see the multimodal RAG post](/blog/agentic-rag.md) - [How to build an AI agent for contract redlining against a compliance playbook](/blog/ai-contract-redlining-compliance-playbook.md) - [Ai Document Automation Extraction To Action](/blog/ai-document-automation-extraction-to-action.md) - [Ai Legal Assistant Document Authoring](/blog/ai-legal-assistant-document-authoring.md) - [Amazon Textract Alternatives](/blog/amazon-textract-alternatives.md) - [Start (clears any prior buffer), navigate the document, then stop into a file.](/blog/android-faster-pdf-rendering.md) - [Android Pdf Out Of Memory Handling](/blog/android-pdf-out-of-memory-handling.md) - [Angular File Viewer Pdf Image Office Files](/blog/angular-file-viewer-pdf-image-office-files.md) - [Approval Workflow Software](/blog/approval-workflow-software.md) - [Approvals Matrix](/blog/approvals-matrix.md) - [Auto Tagging And Document Accessibility In Dotnet Sdk](/blog/auto-tagging-and-document-accessibility-in-dotnet-sdk.md) - [Simple PII redaction.](/blog/automated-pii-removal.md) - [Best Ai Document Workflow Platforms](/blog/best-ai-document-workflow-platforms.md) - [Best Document Ai Platforms](/blog/best-document-ai-platforms.md) - [Best Document Classification Platforms](/blog/best-document-classification-platforms.md) - [Best document parser for RAG: LlamaParse vs. Unstructured vs. Reducto vs. Nutrient](/blog/best-document-parser-llamaparse-unstructured-reducto.md) - [Best Document Parsing Apis](/blog/best-document-parsing-apis.md) - [Best Document Viewers](/blog/best-document-viewers.md) - [Best Multilingual Ocr Software](/blog/best-multilingual-ocr-software.md) - [Best Secure Document Collaboration Platforms](/blog/best-secure-document-collaboration-platforms.md) - [Bpm Guide](/blog/bpm-guide.md) - [Bpm Tools](/blog/bpm-tools.md) - [Build Vs Buy Document Extraction](/blog/build-vs-buy-document-extraction.md) - [Business Automation](/blog/business-automation.md) - [Capex Vs Opex](/blog/capex-vs-opex.md) - [The CEO’s AI playbook: Why decision architecture beats model selection](/blog/ceo-ai-playbook-decision-architecture.md) - [1. 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