HTML+CSS to image renderer based on litehtml

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Project description

pylitehtml

HTML + CSS → PNG/JPEG 图像渲染器：轻量、无需无头浏览器、线程安全。

快 — 稳态单次渲染约 15 ms（比无头 Chromium 快约 1.4×），冷启动约 0.2 s
轻 — 不需要下载 ~190 MB 的 Chromium，官方 wheel 开箱即用（Linux / macOS / Windows）
中文友好 — 内置 Noto Sans + SC 字体，中英文混排共享基线（不会出现中文"飞起来"）
线程安全 — 渲染期间释放 GIL，可多线程并发，asyncio 友好
内置电池 — 零依赖 Markdown 转换器、Jinja2 模板、HTTPS 图片加载

需要 Python ≥ 3.10。不执行 JavaScript（KaTeX 数学公式 / Mermaid 图需预渲染，或改用浏览器方案）。

安装

pip install pylitehtml

30 秒上手

三个最常用入口，按需取用：

① HTML → 图片（推荐入口，自动套用一套干净的 GitHub 风默认样式）

from pylitehtml import html_to_png

png = html_to_png("<h1>Hello</h1><p>世界</p>", width=720)
open("out.png", "wb").write(png)

② Markdown → 图片（内置转换器，零第三方依赖）

from pylitehtml.markdown import markdown_to_png

png = markdown_to_png("# 标题\n\n- 列表\n- [x] 任务\n\n> 引用")

③ 模板文件 → 图片（本地 HTML 自动解析相对路径的 CSS/图片；带关键字参数即按 Jinja2 模板渲染）

from pylitehtml import render_file

png = render_file("project/index.html", width=800)                          # 纯文件
png = render_file("order.html", width=800,
                  title="订单", items=[{"name": "苹果", "price": 5}])        # Jinja2 模板

异步场景：png = await asyncio.to_thread(html_to_png, html)。

效果展示

examples/ 下的示例均独立可运行，各渲染一张图（详见 examples/README）：

示例	说明	渲染结果
`showcase_html.py`	HTML/CSS 能力参考：排版、颜色/渐变、表格、代码、列表、进度条 + 真实 HTTPS 图片 + `data:` URI 图标
`showcase_css.py`	More CSS：conic/radial 渐变、边框样式、`position`、`::before`、`text-overflow:ellipsis`、`white-space:pre`、`vertical-align`
`showcase_markdown.py`	内置零依赖 Markdown 转换器的端到端输出
`showcase_jinja2.py`	Jinja2 数据驱动模板（循环 / 条件 / 过滤器 / autoescape，一张订单发票）
`markdown_full_converter.py`	用 markdown-it-py 接入完整 GFM（脚注 / 定义列表 / Pygments 语法高亮）
`render_markdown_doc.py`	渲染一篇真实复杂文档（`markdown.md`：多表格 / 嵌套列表 / 多语言代码 / 行号引用代码块）

文本测量为子像素精度；模板变量经 autoescape 安全转义；抓取失败的远程图片自动跳过，不影响整图渲染。

使用指南

`html_to_png` — 带默认样式的 HTML 渲染

from pylitehtml import html_to_png, html_to_image, wrap_html, DEFAULT_CSS

# 传入"片段"时，自动套用默认样式；传入完整文档（含 <html>/<body>）时按原样渲染
png = html_to_png("<h1>标题</h1><p>正文 <code>code</code></p>", width=720)
png = html_to_png("<html><body style='background:#000'>…</body></html>")

# HiDPI：scale 同时放大画布宽度与根字号，em 布局等比放大
png = html_to_png(fragment, width=720, scale=2)

# 追加/覆盖样式；或拿原始 RGBA 像素
png = html_to_png(fragment, extra_css="body{background:#0d1117;color:#e6edf3}")
raw = html_to_image(fragment, fmt="raw")           # → RawResult(.data/.width/.height)
doc = wrap_html("<p>x</p>", css=DEFAULT_CSS)       # 仅生成完整 HTML 文档字符串

主要参数：width、scale（HiDPI 倍数，默认 1）、wrap（None 自动判断片段/整文档；True/False 强制）、css / extra_css、fmt（"png"/"jpeg"）、quality、height、shrink_to_fit、locale、fonts、images。

`markdown_to_png` — Markdown → 图片

内置一个纯标准库的轻量 Markdown→HTML 转换器，再交给 html_to_png，不引入 markdown-it-py、pygments 等任何第三方依赖：

from pylitehtml.markdown import markdown_to_png, markdown_to_html

png = markdown_to_png("# 标题\n\n- 列表\n- [x] 任务", width=720)   # scale 默认 2
html = markdown_to_html("**bold**")    # → '<p><strong>bold</strong></p>'

内置转换器覆盖：标题、粗/斜/***粗斜***/删除线/行内代码、反斜杠转义、链接/图片/裸 URL、行内 raw HTML、硬换行、围栏代码块（不高亮）、引用、有序（含 start）/无序/嵌套/任务列表、带对齐的 GFM 表格、分隔线。不支持：setext 标题、引用式链接、脚注、定义列表、缩进代码块。

需要完整 CommonMark/GFM 时，传入 converter=（任意 Callable[[str], str]）接入 markdown-it-py：

from markdown_it import MarkdownIt
from mdit_py_plugins.footnote import footnote_plugin
from mdit_py_plugins.deflist import deflist_plugin
from pylitehtml.markdown import markdown_to_png

md = MarkdownIt("gfm-like").use(footnote_plugin).use(deflist_plugin)
png = markdown_to_png(text, converter=md.render)

`Renderer` / `render` — 底层接口（不注入默认样式）

需要复用实例（字体只加载一次）或精细控制输出时使用：

import pylitehtml

png = pylitehtml.render("<h1>Hello</h1>", width=800)      # 一次性便捷函数

r = pylitehtml.Renderer(width=800)                        # 可复用、可并发
jpg = r.render("<h1>Hello</h1>", fmt="jpeg", quality=90)
raw = r.render("<h1>Hello</h1>", fmt="raw")               # RGBA 原始像素

fmt="raw" 返回的 RawResult 可直接转 PIL / NumPy：Image.frombytes("RGBA", (raw.width, raw.height), raw.data) 或 np.frombuffer(raw.data, np.uint8).reshape(raw.height, raw.width, 4)。

`render_file` 与 Jinja2 模板

按标准网页组织目录，自动解析相对路径的 CSS/图片；传入关键字参数即作为 Jinja2 模板渲染（变量 / 循环 / 条件 / 过滤器 / include / extends）：

r = pylitehtml.Renderer(width=800)
png = r.render_file("project/index.html")                                              # 纯文件
png = r.render_file("order.html", title="订单", items=[{"name": "苹果", "price": 5}])   # 模板

autoescape 默认开启：.html 模板里的 {{ 变量 }} 会转义 </&/"，不可信数据也不会注入。 本地文件安全：file:// 与根路径资源仅在 render_file() 下加载；直接 render() 字符串时忽略。

多线程与异步

先在单线程构造 Renderer，之后可多线程并发 render()（渲染期间释放 GIL）；异步用 await asyncio.to_thread(r.render, html)。带 extra 字体的构造会改写进程级字体配置，勿在渲染进行中于其它线程构造新 Renderer。

能力边界

litehtml = CSS 2.1 + 部分 CSS3。下表为实测结论：

能力	状态
PNG / JPEG / RAW 输出	✅
盒模型、边框（solid/dashed/dotted/double）、`border-radius`、背景色	✅
`linear-gradient` / `conic-gradient`（`radial-gradient` ⚠️ 仅颜色对）	✅
字体、`color`、`text-align`、`line-height`、`text-shadow`、`text-transform`	✅
`text-decoration`、`<mark>`/`<sub>`/`<sup>`/`<kbd>`、`white-space:pre/nowrap`	✅
列表（嵌套 / `list-style-type` / 任务列表）、定义列表、表格（对齐 / `:nth-child`）	✅
`float`、`inline-block`、`position:relative/absolute`、`text-overflow:ellipsis`、`::before/::after`	✅
图片 `<img>`：`data:`(PNG/JPEG/WebP) / 本地 / HTTP·HTTPS、`@import` CSS	✅
SVG 图片（内置 nanosvg：path/形状/描边/`userSpaceOnUse` 渐变；不含 `<text>`/滤镜/内联 `<svg>` 标记）	⚠️ 图形子集
中文 / 多语言（内置 Noto Sans + SC，中英共享基线、子像素测量）	✅
多线程并发、`asyncio.to_thread`	✅
Flexbox（简单行 / 列）	⚠️ 部分
`background-image:url()`、`box-shadow`、`transform`、`opacity`、`letter-spacing`	❌
CSS Grid、`var()`、`@font-face`、动画 / 过渡、`filter`、JavaScript	❌

图片抓取失败会自动跳过（不报错）；官方 wheel（Linux manylinux_2_34 / macOS / Windows）均含 OpenSSL ≥ 3.0，支持 https。

性能：对比 Playwright

同一篇文档各渲染 30 次（macOS arm64，width=720；基准脚本 bench/bench_vs_playwright.py）：

指标	pylitehtml	Playwright（无头 Chromium）
单次渲染（warm，均值）	≈ 15.5 ms	≈ 21 ms
首屏 / 冷启动	≈ 0.2 s	≈ 0.25 s（OS 已缓存）/ 首次可达 ~3.4 s
额外依赖	无（仅系统 Cairo/Pango 等）	需下载 Chromium ~190 MB+，每次渲染有浏览器进程内存开销
JavaScript	❌ 不执行	✅ 可执行（KaTeX/Mermaid 等）

要点：稳态吞吐约快 1.4×；真正的差距在部署体积与冷启动——无 Chromium、无浏览器进程，适合容器 / Serverless / 弹性扩缩容场景。需要执行 JS（数学排版、Mermaid 绘图）时仍应选 Playwright。

pip install playwright && playwright install chromium   # 或: uv pip install --group bench
python bench/bench_vs_playwright.py 30

API 速查

# 高层（推荐）：自动默认样式、片段/整文档自动判别、HiDPI scale
html_to_png(html, *, width=720, scale=1, wrap=None, css=DEFAULT_CSS, extra_css="",
            fmt="png", quality=85, height=0, shrink_to_fit=True,
            locale="en-US", fonts=None, images=None) -> bytes
html_to_image(...)   # 同参数，fmt 可取 "raw" → RawResult(.data/.width/.height，RGBA 行主序)

markdown_to_png(md, *, converter=None, ...)   # converter: Callable[[str], str]，默认内置转换器
markdown_to_html(md) -> str

# 底层：不注入默认样式
Renderer(width, *, locale="en-US", dpi=96.0, device_height=600, fonts=None, images=None)
Renderer.render(html, *, fmt="png", quality=85, height=0, shrink_to_fit=True)
Renderer.render_file(path, *, fmt="png", quality=85, height=0, shrink_to_fit=True, **template_data)
render(html, width, ...) / render_file(path, width, ...)   # 一次性便捷函数

FontConfig(default="Noto Sans", size=16, extra=[])          # 已内置 Noto Sans/SC + DejaVu Sans
ImageConfig(cache_mb=64.0, timeout_ms=5000, max_mb=10.0, allow_http=True)

scale 等比放大画布与（默认样式的）根字号；shrink_to_fit 把画布收窄到内容宽度。
内置字体使 sans-serif/serif/monospace 与中文在无系统字体时也能渲染；dpi 影响 pt 换算。

从源码构建

Ubuntu / Debian

sudo apt-get install -y libcairo2-dev libpango1.0-dev libfontconfig1-dev \
  libwebp-dev libjpeg-turbo8-dev libssl-dev cmake ninja-build pkg-config
pip install -e ".[dev]" --no-build-isolation

macOS

brew install cairo pango fontconfig webp jpeg-turbo openssl@3 cmake ninja
CC=/usr/bin/clang CXX=/usr/bin/clang++ pip install -e ".[dev]" --no-build-isolation

运行测试 / 代码检查

pytest tests/ -v
ruff check .        # lint
ruff format .       # 格式化（CI 用 `ruff format --check` 校验）

基于

litehtml · Cairo · Pango · FontConfig · pybind11

MIT License

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This version

0.2.2

Jun 22, 2026

0.2.1

May 29, 2026

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SHA256	`b7358eab43aa584713b34b759b6b5dcdda58ae5680ea1d7bf55229a347488266`
MD5	`b71e8117c31bdd8929fc20da370ed20d`
BLAKE2b-256	`9c4aaa9c730d6f1b6cca1424a5a3099712ab196a1c08bced9f23ae3d9b7d07f9`

Algorithm	Hash digest
SHA256	`07476d2b565d894ee3623a8c32a781ab010f52ea04444d7c044bf4081f67a049`
MD5	`e561ecb748a63a7046eae9b827505120`
BLAKE2b-256	`faa75c2e43fe9ae1ed06caea06c3ab52cd2f2d7f7b5382dbbdbcfbfd3079772b`

Algorithm	Hash digest
SHA256	`9723d05fe5ad65586d39643d7dedf1fe57cdf4b4c68247b7abb204c130a9a71b`
MD5	`d64d250a474bfecee464545ca10dfdf4`
BLAKE2b-256	`c973503bc63919b281040d751a07687b48adb73acdc83510cb764db70feb4a2e`

Algorithm	Hash digest
SHA256	`73e35f2c15c2550e03a29f8d9eb74d0e78dd17441d0a47b1235a7988ef538385`
MD5	`b6f062cbc16260c958258ac1f6c9f385`
BLAKE2b-256	`daeea132f7b84608497c70f8039b2ac7fae9710443de4c5160b0732ee7c2cc6d`

Algorithm	Hash digest
SHA256	`9b1fe748fa8f15d574132905110dfa32fbf0c60d01926c5ffbdcfed0a5f9e72f`
MD5	`96fe58602a7658d9e558a1509ac18a59`
BLAKE2b-256	`346becde386555801551883b21ac0f6bede60f3fff40ec350a8a6adf2bef581b`

Algorithm	Hash digest
SHA256	`32b9966d55f5acb146ef120ff8eda87050e636ad56b93323b589f822836e10bf`
MD5	`1e599f8c15f2e6034b2f9270639a08ee`
BLAKE2b-256	`72f124d01eb24ab1fa766221dcc14e5fbad1b6389320162e66a2296a1ae3929d`

Algorithm	Hash digest
SHA256	`ccd7908393b94c81a874bb2558efcadc1c0d02392058a5b8dbe69e7fdf7e4aba`
MD5	`e8834a2e090af467613f7c4c6081e893`
BLAKE2b-256	`ab0e0e433b441207a5c3cf5386c0df7455885b5ba8cff00adbdfda9d10c66e6a`

pylitehtml 0.2.2

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pylitehtml

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30 秒上手

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html_to_png — 带默认样式的 HTML 渲染

markdown_to_png — Markdown → 图片

Renderer / render — 底层接口（不注入默认样式）

render_file 与 Jinja2 模板

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`html_to_png` — 带默认样式的 HTML 渲染

`markdown_to_png` — Markdown → 图片

`Renderer` / `render` — 底层接口（不注入默认样式）

`render_file` 与 Jinja2 模板