HDR to WEBP Converter
FileFlip converts HDR to WEBP entirely inside your browser, using ImageMagick compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert an HDR file to WEBP?#
- Drop your HDR file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to WEBP and the conversion starts on its own. FileFlip downloads 14.1 MB of WebAssembly the first time and nothing after that, then runs ImageMagick on your own machine.
- Save the WEBP file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting HDR to WEBP lose quality?#
Yes, once. HDR keeps everything and WEBP does not, so this is the first time the file meets a lossy encoder. At high quality the difference is hard to see, and it is worth keeping the HDR original, because every later re-save of the WEBP loses a little more.
Is it safe to convert HDR files online?#
Yes, because nothing is uploaded. FileFlip converts HDR files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What HDR to WEBP actually does to the file#
Converting HDR to WEBP runs on ImageMagick, downloads 14.1 MB of WebAssembly the first time and nothing after that, encodes a lossless source with a lossy encoder for the first time.
| Engine | ImageMagick |
|---|---|
| Conversion path | One step: HDR → WEBP |
| Downloaded to your browser | 14.1 MB, once, then cached by your browser |
| Quality | Lossy, first generation |
| You get back | One file |
| Where it runs | In a background worker, so the page stays responsive |
What is an HDR file?#
An HDR file stores a high-dynamic-range raster image using Radiance's RGBE encoding, which packs red, green and blue mantissas with one shared exponent per pixel so a scene can hold a far wider range of brightness than a standard 8-bit image.
Reach for HDR when you need a compact high-dynamic-range environment map or lighting reference that most 3D tools and renderers can read without a plugin.
Convert HDR to OpenEXR when a VFX pipeline needs true floating-point precision, an alpha channel or multiple layers in one file, or convert it to JPEG or PNG once the image has been tone-mapped for a normal display.
What is a WEBP file?#
A WebP file holds a still or animated image compressed with Google's WebP codec, built as a single format to undercut JPEG, PNG, and GIF on file size at comparable quality.
Use WebP for images on the web: it's the general-purpose replacement for JPEG, PNG, and GIF now that every major browser renders it natively.
Convert WebP to JPEG or PNG when the file needs to open in older software, a print workflow, or an app that still doesn't recognize the .webp extension.
HDR to WEBP questions people ask#
What is an HDR file used for?
An HDR file most often stores an environment map or lighting reference for 3D rendering, since Radiance's RGBE encoding was built for the Radiance lighting-simulation software. Photographers also use the .hdr extension for panoramas merged from several exposures, before tone-mapping the result down to a normal image.
Is an HDR file the same as an iPhone or camera 'HDR photo'?
No. A phone's HDR mode blends several exposures and saves an ordinary JPEG or HEIC, while an HDR file with the .hdr extension is a Radiance RGBE file that keeps the full brightness range rather than compressing it into 8 bits. The two share a name but not a file format.
What's the difference between HDR and OpenEXR?
HDR (Radiance RGBE) packs each pixel into 32 bits with an 8-bit mantissa per channel and a shared exponent, while OpenEXR stores true 16- or 32-bit floating-point values per channel, supports an alpha channel, and can hold multiple image layers in one file. OpenEXR has mostly replaced HDR in VFX compositing, though HDR remains common for HDRI environment maps because of its smaller size and long-standing tool support.
What is a WebP file?
A WebP file is an image saved with Google's WebP codec, which can encode a picture either losslessly or lossily and supports both transparency and animation in the same format. Google introduced it in 2010 to replace JPEG, PNG, and GIF with one format that produces smaller files at comparable quality.