Convert HDR to OTB Online
Convert RGBE images to OTB format free, fast, and privately in your browser.
Drag & drop files, or browse
Up to 20 images at once
How to convert HDR to OTB
Upload your files
Drag & drop or browse up to 20 HDR files at once.
Browser converts locally
Files convert to OTB in your browser - nothing is uploaded anywhere.
Download results
Save files individually or download everything as a ZIP bundle.
Why use this converter
100% Private - Nothing Uploaded
Your RGBE files never leave your device. All conversion happens locally inside your browser using WebAssembly. Zero server contact.
Batch + ZIP Download
Convert up to 20 RGBE files to OTB at once and download them all as a single ZIP archive in one click.
High Quality Output
Powered by a professional WASM engine for accurate RGBE to OTB conversion every time.
Instant Conversion
Your RGBE files convert to OTB in seconds using WebAssembly - no waiting, no queues.
Frequently asked questions
4 questionsUpload your RGBE files by dragging them into the drop zone or clicking Browse. Select up to 20 files at once, then click Convert. Your files are processed locally in your browser and ready to download in seconds - no account or internet connection needed after the page loads.