SVG to HDR Converter
Convert SVG to HDR in your browser. The SVG is sanitized and rendered at the pixel size you choose, so it is sharp at any resolution you ask for. You get a Radiance RGBE (.hdr) file, with the 8-bit sRGB values converted to linear light. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
SVG expected · other image formats also work
How to use SVG to HDR
- 1
Add your SVG files: drop them here, choose them, or paste from the clipboard.
- 2
Pick the colour that replaces transparent areas, since HDR has none.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .hdr files one at a time or together as a ZIP.
Why use Aback Images for svg to hdr
Where the HDR goes next
HDR opens in Blender, Photoshop, Houdini, Unreal Engine, Unity and Affinity Photo.
HDR next to SVG
Rasterising turns a description of shapes into stored pixels, so the HDR is usually larger than a small SVG, and grows with the size you render at.
Written without a lossy pass
The HDR is written losslessly, so the pixels decoded from the SVG arrive unchanged.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
SVG vs HDR
What changes from SVG to HDR
Encoding: the SVG uses XML text describing paths, shapes and text, sometimes gzipped as .svgz; HDR uses run-length encoded RGBE scanlines, and the download is a Radiance RGBE (.hdr) file, with the 8-bit sRGB values converted to linear light.
Bit depth: not fixed: coordinates and colours are continuous values in the SVG; HDR allows an 8-bit mantissa per channel sharing an 8-bit exponent (RGBE), 32 bits per pixel, and the HDR written here has RGBE, 32 bits per pixel.
Colour: sRGB by default, other spaces through CSS colour functions in the SVG; HDR supports linear RGB (or XYZ in the XYZE variant), written here as linear-light RGB.
Transparency: the SVG stores it as opacity on any element, with anti-aliased edges; the HDR has none, so transparent areas are filled with the colour you choose.
Animation: SMIL or CSS animation described in the markup; a single still rendering is converted.
Metadata: the SVG can carry title, description and RDF metadata elements; HDR can carry a text header with FORMAT, EXPOSURE and optional comments, but nothing is copied across.
About SVG
SVG describes shapes, paths and text as XML instead of pixels, so it stays crisp at any size. It is the standard for logos, icons and illustrations on the web.
An SVG is an XML document: a root <svg> element with a viewBox, then paths, shapes, text, gradients and filters. It can also embed raster images and, dangerously, scripts, which is why untrusted SVG is sanitized before rendering here.
SVG files usually come from icon sets, logos, design tools (Figma, Illustrator, Inkscape) and diagram exports.
About HDR
Radiance .hdr stores high dynamic range light values, widely used for 3D environment maps and HDRI lighting.
A Radiance file starts with '#?RADIANCE' (or '#?RGBE'), text lines such as FORMAT=32-bit_rle_rgbe and EXPOSURE, a blank line, a resolution line like '-Y 2048 +X 4096', then the scanlines.
When converting SVG to HDR makes sense
HDR is the better choice for 3D lighting and environment maps, while SVG suits logos, icons and illustrations.
HDR strengths: True high dynamic range; Standard for HDRI environment maps. Drawbacks to weigh: Needs tone mapping to view on normal screens.
Limitations
- Rasterising fixes the picture at one pixel size; set a larger size under More options if you need to print or zoom.
- Text that was not converted to outlines is drawn with the fonts on this device, so lettering can look different from the designer's screen.
- No range is added: the HDR holds the 8-bit picture in linear light, and nothing in it is brighter than the original white.
- 3D software treats the file as linear light, so an ordinary photo used as an environment map may need its exposure raised to light a scene well.
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Frequently asked questions
Does converting SVG to HDR lose quality?
HDR is written losslessly, so the pixels are stored exactly as decoded.
What happens to transparency when converting SVG to HDR?
SVG stores transparency as opacity on any element, with anti-aliased edges. HDR has no alpha channel, so transparent pixels are composited onto a solid colour, white unless you pick another. To keep transparency, convert to PNG, WebP or AVIF instead.
What resolution will the output be?
SVG has no fixed pixel size, so it is rendered at its declared width and height. Use the resize options to render it larger: because it is vector, an SVG stays perfectly sharp at any size you choose here. Files are sanitized first, so scripts and external references never run.
Does saving as HDR make a real HDRI?
No. A real HDRI is merged from several exposures. This file holds an 8-bit image in linear light, so 3D software reads it correctly, but it has no more range than the source.
Which apps open HDR files?
Blender, Photoshop, Houdini, Unreal Engine, Unity and Affinity Photo. It does not open in web browsers.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.