Can I convert Radiance HDR to WebP on iPhone, Android, Mac or Windows?

Yes. ConvertPixels works in Safari, Chrome, Edge and Firefox on any device, so you can convert Radiance HDR to WebP on your phone or computer without installing an app.

Is there a free HDR to WebP converter with no sign-up?

Yes, this one. Converting HDR to WebP on ConvertPixels is free, with no sign-up, no watermark and no daily cap. Convert up to 30 files per batch, each up to 50 MB.

Can I convert HDR to WebP without losing quality?

WebP is a lossy format, but our default quality setting (85) keeps the result visually identical to the original. Turn quality up in the options for maximum detail, or down for a smaller file.

Can I batch convert HDR to WebP?

Yes. Add up to 30 HDR files and convert them in one batch. You can even choose a different output format for individual files, then download them separately or together as a ZIP.

Is it safe to upload HDR files to ConvertPixels?

Yes. Uploads use an encrypted connection and are processed automatically - nobody views them. Your originals are deleted straight after conversion and the results within an hour, or instantly if you click "Delete from server now".

Convert

Radiance HDR to WebP Converter

Convert Radiance HDR images to WebP online in seconds - free, with no sign-up and no watermark. Batch convert up to 30 files and download them together as a ZIP.

Free
No sign-up
No watermark
Private by design

Choose filesor drag and drop files hereUp to 30 files · 50 MB each

Image Converter

How to use it

1
Drop your Radiance HDR files onto the converter
2
Press Convert to turn them into WebP
3
Download your WebP images one by one or as a ZIP

Radiance HDR to WebP

Why convert HDR to WebP?

The main difference: HDR is a lossless format, while WebP is a lossy or lossless format. WebP can have a transparent background, HDR can't.

Smaller files, faster uploads

WebP supports lossy compression, so your file typically ends up a fraction of the HDR size - quicker to attach to an email, upload to a form or load on a web page.

Supports transparent backgrounds

WebP can hold a transparent background. Convert your image first, then cut out the background or place it on top of other designs.

Lighter images for your website

At the same visual quality, WebP files are noticeably smaller than JPG or PNG. Lighter images mean faster pages, better Core Web Vitals and a small boost for SEO.

Radiance HDR vs WebP: what's the difference?

Property	Radiance HDR	WebP
Compression type	Lossless (exact pixels, larger files)	Lossy or lossless
Transparent background	No	Yes
Animation	No	Yes
Where it opens	None	All modern browsers; some older apps and upload forms don't accept it
Used for	3D lighting (HDRI environment maps) and visual effects	Fast-loading website images

What is an Radiance HDR file?

Radiance HDR (.hdr) is a high dynamic range format that stores the real brightness of a scene, far beyond what a normal photo can hold. It's used for HDRI environment maps that light 3D scenes, and in visual effects.

HDR files look flat or blown out in ordinary viewers because screens can't show that range directly - they need tone mapping, which converting to JPG or PNG applies.

How to open an Radiance HDR file

Photoshop, GIMP, Blender, Affinity Photo and most 3D software open .hdr files. Mac Preview shows a basic preview. Convert to JPG or PNG to get a viewable, shareable image.

Extensions: .hdr, .pic
Range: High dynamic range (32-bit float)
Best for: HDRI lighting, visual effects
Also called: RGBE

What is a WebP file?

WebP is an image format Google introduced in 2010 to make websites load faster. It can compress photos lossily like JPG, or graphics losslessly like PNG - usually with 25-35% smaller files - and it supports transparency and animation too.

That's why so many images you save from websites, including Google Images, arrive as .webp files. Browsers love them; older software and many upload forms still don't.

How to open a WebP file

Chrome, Edge, Firefox and Safari display WebP directly - drag the file into a browser window. Windows 10/11 Photos and Paint and Mac Preview (Big Sur and later) open it as well. If an app or website rejects it, convert it to JPG or PNG.

Extension: .webp
Compression: Lossy or lossless
Transparency: Yes
Best for: Fast-loading website images