100% Free No Upload Bulk Conversion

Bulk PNG to HDR Converter — Free, No Upload

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

PNG HDR · ZIP

Bulk PNG → HDR Converter

Select files, convert, download ZIP — all locally

Drop PNG files here or click to browse

Supports batch selection — convert hundreds of files

PNG → HDR ZIP

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✓ Conversion completed! All files converted successfully. Click Download ZIP to save them.

Why convert PNG to HDR?

The main issue with PNG is incompatibility with most modern applications. Converting to HDR fixes this by providing perfect pixel preservation with smaller 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.

Transparent areas will be filled with white background

Technical comparison: PNG vs HDR

Property	PNG	HDR
Full name	Portable Network Graphics	High Dynamic Range Image
Compression	Lossless	Lossless
Color depth	48-bit	32-bit float
Transparency	Yes	No
Web support	Yes	No
Developed by	PNG Development Group (1996)	Radiance / Greg Ward (1989)
Best for	Web graphics with transparency	High dynamic range photography

How to use — 3 simple steps

Select your PNG files

Drag & drop or click to choose multiple PNG images. No file size restrictions.

Start the conversion

Click "Convert to :to" — your files are processed locally using Canvas API. No upload, no waiting.

Download ZIP archive

All converted HDR files are bundled into a single ZIP. One click, everything saved.

Popular use cases for PNG → HDR

Print professionals converting PNG to HDR for better color accuracy

E-commerce store owners optimizing product images from PNG to HDR

Game developers converting texture assets (PNG) to a more compatible format (HDR)

Students and researchers preparing images for academic papers or presentations

💡 Pro tips

If your image has transparency, consider converting to PNG instead to preserve it
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 PNG.

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.

Bulk PNG to HDR Converter — Free, No Upload

Why convert PNG to HDR?

Technical comparison: PNG vs HDR

How to use — 3 simple steps

Popular use cases for PNG → HDR

💡 Pro tips

Frequently Asked Questions

How much smaller will my PNG file become after converting to HDR?

Which browsers support HDR images?

Can I convert animated PNG files?

What happens to transparent areas when converting PNG to HDR?

Other conversions from PNG

Convert other formats to HDR