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Install WeasyPrint on Ubuntu
WeasyPrint provides a Python API for converting HTML to PDF. Its installation has native-library requirements, which can vary with the current release and Ubuntu version. Follow the current official installation instructions rather than relying on commands written for an older Ubuntu release.
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- Install WeasyPrint using either the Ubuntu distribution package or the documented virtual-environment method, including the native dependencies listed for your chosen method.
- Confirm the installed application and its environment with
weasyprint --info, which the documentation provides for checking the installation. - Install a font that covers the script you need, using the package manager for your Ubuntu release or making a font file available to Fontconfig. Check the font’s licensing and deployment terms before bundling or distributing it.
There is no single font package established here as a guaranteed choice for every Indian language or Ubuntu release. Choose based on actual script coverage, then verify it on the target system.
Check which font Ubuntu will use
WeasyPrint accesses fonts through Pango and Fontconfig. Use Fontconfig’s tools to inspect what is installed and which family a request resolves to:
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fc-listlists fonts visible to Fontconfig.fc-match "Your Font Family"reports the font Fontconfig selects for that family pattern. Replace the example with the family you intend to use.
Run these checks as the same service account, inside the same container or virtual machine, and with the same environment as the PDF-producing process. A font visible in an interactive shell may not be available to a web worker or scheduled job.
Render HTML to PDF in Python
Once WeasyPrint and an appropriate font are available, call HTML(...).write_pdf(...). This minimal example reads a local HTML file and writes a PDF:
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from weasyprint import HTML
HTML(filename="input.html").write_pdf("output.pdf")For a string of HTML, pass string instead of filename:
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html = """<!doctype html>
<html lang="hi">
<head>
<meta charset="utf-8">
<style>
body { font-family: "Your Font Family", sans-serif; }
</style>
</head>
<body>
<p>यहाँ अपने लक्ष्य भाषा का वास्तविक पाठ रखें।</p>
</body>
</html>"""
HTML(string=html).write_pdf("output.pdf")Replace Your Font Family with a family installed and verified on your Ubuntu image, and replace the sample text with representative content in the script you need. Declaring a family in CSS asks for that family; it does not install it or prove that it covers every character.
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Load a font explicitly with CSS
If a local font file is available to the renderer, CSS @font-face can identify it explicitly. When using this approach, create one FontConfiguration and pass it to both the stylesheet and the PDF write call, as in the official setup example:
from pathlib import Path
from weasyprint import CSS, HTML
from weasyprint.text.fonts import FontConfiguration
font_config = FontConfiguration()
font_path = Path("/app/fonts/your-font-file.ttf").resolve()
css = CSS(
string=f"""
@font-face {{
font-family: "Target Script";
src: url("{font_path.as_uri()}");
}}
body {{ font-family: "Target Script", sans-serif; }}
""",
font_config=font_config,
)
HTML(filename="input.html").write_pdf(
"output.pdf",
stylesheets=[css],
font_config=font_config,
)Use a real, readable path to the font file in your deployment. This example shows how to wire the font into WeasyPrint; it does not establish that any particular font file supports a particular Indian script.
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Validate the target language in the PDF
Test on the Ubuntu image and under the account that will run in production. Include actual text from every required script, with the conjuncts, vowel signs, diacritics, punctuation, and numerals your documents contain. Inspect the generated PDF in a viewer; where appropriate, also check whether text can be selected or extracted. These checks help distinguish a font-rendering problem from a problem in the source HTML.
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- If the expected family is not returned by
fc-match, install it or correct the family name and Fontconfig visibility. - If the family matches but characters are missing, confirm that the chosen font covers those exact characters; a family match alone does not prove glyph coverage.
- If the font is available system-wide but the PDF process cannot see it, check the service account, container image, and runtime environment. Try an explicit
@font-faceresource if needed.
WeasyPrint’s documentation says fonts are embedded in generated PDFs. Embedding does not add missing glyphs to a font that lacks them.
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Common failures and fixes
| Symptom | Likely cause | What to check |
|---|---|---|
| Squares appear instead of letters, or characters are absent | The rendering process cannot access a suitable font, or the chosen font lacks the required glyphs. | Use fc-list and fc-match in the rendering environment, verify script coverage, install a suitable font, or load it with @font-face. WeasyPrint’s missing-font guidance identifies font availability as the issue to address. |
| The family named in CSS is not used | The family may not be installed or visible to Fontconfig, or the requested name may not match the installed family. | Check the exact family reported by fc-list and the result of fc-match. Repeat the check as the PDF process’s account. |
| Python cannot import WeasyPrint or PDF generation fails during setup | The application installation or a native dependency may be missing or incompatible with the selected installation method. | Review the current installation instructions for your Ubuntu release and method, then run weasyprint --info to inspect the installation. |
| It works locally but fails on a server or in a container | The deployed environment may not include the font or native dependencies, or may run under a different account. | Install dependencies and fonts in the actual image or host, then run the same font checks and a representative render in that environment. |
Security and deployment considerations
Do not treat HTML-to-PDF rendering as safe for arbitrary input. WeasyPrint’s documentation warns about security risks when processing untrusted HTML or CSS. Define an input policy and appropriate isolation and resource-access controls for your application; avoid allowing untrusted documents to trigger unrestricted access to local files or remote resources.
For repeatable deployment, keep the Ubuntu version, WeasyPrint installation method, native dependencies, font files, and CSS configuration consistent across environments. Re-run the representative-script PDF check whenever one of those changes. Font selection and deployment rights should be verified for the font you choose; the cited documentation does not establish licensing terms for a particular family.
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