100% Free No Upload Bulk Conversion RAW Support

Bulk ARW to HDR Converter — Free, No Upload

Convert multiple ARW files to HDR instantly — all in your browser. No file limits, no watermarks, and completely private.

ARW HDR  ·  ZIP
Bulk ARW → HDR Converter
Select files, convert, download ZIP — all locally
RAW conversion may take longer — files are processed via WebAssembly in your browser

Drop ARW files here or click to browse

Supports batch selection — convert hundreds of files

ARW → HDR ZIP
0 files
Converting 0 / 0
✓ Conversion completed! All files converted successfully. Click Download ZIP to save them.

Why convert ARW to HDR?

Because ARW files use lossless RAW compression and 14-bit per channel, they are not ideal for High dynamic range photography. Converting them to HDR (lossless, 32-bit float) solves this. Converting ARW RAW images to HDR applies essential post-processing: white balance, demosaicing, and tone mapping. The result is a standard image ready for printing or further editing in any software.

RAW conversion may take longer — files are processed via WebAssembly in your browser

Technical comparison: ARW vs HDR

PropertyARWHDR
Full nameSony Alpha RAWHigh Dynamic Range Image
Compression Lossless RAW Lossless
Color depth14-bit per channel32-bit float
Transparency No No
Web support No No
Developed bySony (2006)Radiance / Greg Ward (1989)
Best for Sony Alpha mirrorless photography High dynamic range photography

How to use — 3 simple steps

1
Select your ARW files
Drag & drop or click to choose multiple ARW images. No file size restrictions.
2
Start the conversion
Click "Convert to :to" — your files are processed locally using WebAssembly. No upload, no waiting.
3
Download ZIP archive
All converted HDR files are bundled into a single ZIP. One click, everything saved.

Popular use cases for ARW → HDR

Uploading ARW photos to social media after converting to HDR

Saving hard drive space by converting a batch of ARW images to HDR

Emailing high-quality images without attachment limits (use HDR)

Creating a backup copy of your ARW library in the more compatible HDR format

💡 Pro tips

  • RAW files process directly in your browser — no software installation needed
  • Bulk convert your entire RAW session at once — drop all files together
  • Use the ZIP download to get all converted files in a single click
  • All processing is private — files are never uploaded to any server

Frequently Asked Questions

Typically 60-90% smaller for lossy HDR, or 20-40% for lossless HDR compared to uncompressed ARW.
HDR is supported by all modern browsers (Chrome, Firefox, Safari, Edge) if web_support is true. Check caniuse.com otherwise.
Only the first frame of animated GIF will be converted to HDR. For animation, use GIF or WebP.
HDR supports transparency? If yes, preserved. If not, transparent areas become white/black. Use PNG for transparency.
Application offline!