100% Free No Upload Bulk Conversion

Bulk HDR to PDF Converter — Free, Unlimited

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

HDR PDF  ·  ZIP
Bulk HDR → PDF Converter
Select files, convert, download ZIP — all locally
HDR Support is coming soon — we are working on it.

Drop HDR files here or click to browse

Supports batch selection — convert hundreds of files

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

Why convert HDR to PDF?

A quick technical note: HDR uses 32-bit float while PDF uses 32-bit. That difference matters most when your use case involves Documents and print-ready files. This conversion processes your files entirely in your browser using WebAssembly – no upload, no server, no privacy concerns. Perfect for sensitive or large batches. It's a low-effort change with a disproportionately high payoff.

Technical comparison: HDR vs PDF

PropertyHDRPDF
Full nameHigh Dynamic Range ImagePortable Document Format
Compression Lossless Mixed
Color depth32-bit float32-bit
Transparency No Yes
Web support No Yes
Developed byRadiance / Greg Ward (1989)Adobe (1993)
Max colorsfloating point16.7M
MIME typeimage/vnd.radianceapplication/pdf
Category Raster image Document
Year gap 4 years apart in technical development
Best for High dynamic range photography Documents and print‑ready files

How to use — 3 simple steps

1
Select your HDR files
Drag & drop or click to choose multiple HDR 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 PDF files are bundled into a single ZIP. One click, everything saved.

Popular use cases for HDR → PDF

Uploading HDR photos to social media after converting to PDF

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

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

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

💡 Pro tips

  • 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

PDF uses mixed compression. If lossy, at 85-92% quality the loss is imperceptible. If lossless, every pixel is preserved.
No artificial limit. Browser memory is the only constraint. Files up to 500 MB work well.
Yes. The bulk converter processes all selected files sequentially. Hundreds of files possible.
Yes. Everything happens locally in your browser via WebAssembly. Files never uploaded.
Application offline!