How to Convert SVG to PNG in Code — JavaScript, Python, and Node.js

Convert SVG to PNG programmatically — JavaScript Canvas API, Node.js with Sharp or Puppeteer, Python with CairoSVG for server-side SVG rasterization.

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SVG to PNG in Node.js with Sharp

Sharp is the fastest Node.js image processing library and supports SVG to PNG conversion directly. `sharp(svgBuffer).png().toFile('output.png')` converts an SVG buffer to PNG. Sharp uses libvips for high-performance rasterization — significantly faster than Puppeteer for batch SVG conversion.

`npm install sharp`
`const sharp = require('sharp')`
`await sharp(svgBuffer).resize(1200, 630).png().toFile('output.png')`

SVG to PNG in Python with CairoSVG

CairoSVG is the standard Python library for SVG to PNG conversion using the Cairo rendering engine. `cairosvg.svg2png(url='input.svg', write_to='output.png', output_width=1200)`. CairoSVG handles complex SVG features including filters, gradients, and masks accurately.

`pip install cairosvg`
`import cairosvg`
`cairosvg.svg2png(url='input.svg', write_to='output.png', scale=2.0)`

Frequently Asked Questions

How do I convert SVG to PNG in Node.js without installing native dependencies?

Use Puppeteer (headless Chrome): `const browser = await puppeteer.launch(); const page = await browser.newPage(); await page.setContent(svgHtml); const img = await page.screenshot({ type: 'png' })`. Puppeteer fully renders SVG including animations, filters, and web fonts.

How do I set the output size when converting SVG to PNG in code?

Sharp: `.resize(width, height)` before `.png()`. CairoSVG: `output_width=1200` parameter scales proportionally. Puppeteer: set `page.setViewport({ width: 1200, height: 630 })` before screenshot. For Sharp, ensure the SVG viewBox is set correctly for the resize to maintain proportions.

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