ORF to WebP Converter
Convert ORF to WebP in your browser. The preview inside the maker notes is found by scanning the whole file, and that preview is what gets converted. No raw development happens here. You get a lossy WebP at the quality you choose (lossless under More options), keeping transparency. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
RAW expected · other image formats also work
How to use ORF to WebP
- 1
Add your ORF files: drop them here, choose them, or paste from the clipboard.
- 2
Set the quality. 80 to 85 is visually close to the original for most photos.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .webp files one at a time or together as a ZIP.
Why use Aback Images for orf to webp
Where the WebP goes next
WebP opens in every current browser, Windows, macOS, Android, and recent Photoshop, GIMP and Affinity.
WebP next to ORF
The WebP is made from the camera's 8-bit preview, so it is a small fraction of a 12 to 30 MB raw file.
A second JPEG generation
The pixels come from the JPEG preview the camera embedded in the ORF, so they have been compressed once already; keep the quality at or above the default.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
ORF vs WebP
What changes from ORF to WebP
Encoding: the ORF uses losslessly compressed sensor data, with a preview and thumbnail; WebP uses lossy VP8 coding or lossless VP8L, and the download is a lossy WebP at the quality you choose (lossless under More options), keeping transparency.
Bit depth: 12 bits per channel in the ORF; WebP allows 8 bits per channel, and the WebP written here has 8 bits per channel. The sensor's 12 bits are not used: the 8-bit camera preview is converted.
Colour: camera RGB from a Bayer mosaic in the ORF; WebP supports RGB; lossy WebP stores colour at half resolution (4:2:0), written here as 8-bit sRGB.
Metadata: the ORF can carry EXIF and Olympus maker notes, which also contain the preview; WebP can carry EXIF, XMP and ICC chunks, but nothing is copied across.
About ORF
ORF is the raw format of Olympus and OM System cameras, built around Four Thirds and Micro Four Thirds sensors. It stores 12-bit sensor data with a JPEG preview kept inside Olympus's maker notes.
ORF looks like TIFF but replaces the version number 42 with the letters 'RO', so a little-endian file starts 'IIRO' and generic TIFF readers reject it. Its JPEG preview is not in the main image directory but inside the camera-settings block of Olympus's maker notes.
ORF files usually come from Olympus E-series DSLRs, OM-D and PEN mirrorless cameras and OM System bodies.
About WebP
WebP is Google's web image format. It supports lossy and lossless compression, transparency and animation, and is typically 25 to 35 percent smaller than JPEG at the same visual quality.
A WebP is a RIFF file: 'RIFF', a length, 'WEBP', then chunks. A simple lossy file is one VP8 chunk and a lossless one is VP8L; the extended VP8X header announces alpha, animation, ICC, EXIF or XMP chunks.
When converting ORF to WebP makes sense
WebP is the better choice for images on websites and in apps, while ORF suits editing Olympus and OM System photos in a raw developer.
WebP strengths: 25-35% smaller than JPEG; Transparency and animation in one format; Supported by every modern browser. Drawbacks to weigh: Some older desktop apps and photo printers cannot open it; Max 16383 px per side.
Limitations
- High Res Shot files combine several exposures in camera; the preview shows the combined result at its stored size.
- A few older desktop apps, print services and upload forms still reject WebP; keep a JPG or PNG copy for those.
- WebP images are limited to 16383 pixels on each side.
More conversions
Related tools
Convert WebP to ORF in your browser, saved as a Linear DNG, the raw file every ORF editor also opens. Batch, private, no uploads.
Convert any image (HEIC, PNG, WebP, AVIF, RAW, PSD, SVG and 26 more) to WebP in bulk, right in your browser.
Convert JPG to WebP in your browser, ready for images on websites and in apps. Batch, private, no uploads.
Shrink JPG, PNG, WebP, AVIF and GIF files with MozJPEG, OxiPNG and modern codecs, with a live before/after preview.
Resize to exact pixels, a percentage or a longest side, with Lanczos3 and Magic Kernel resampling. Batch ready.
Strip EXIF, GPS, XMP, IPTC and comments losslessly. Pixels are never re-encoded for JPG, PNG and WebP.
Convert between 34 image formats in bulk: HEIC, WebP, AVIF, JPEG XL, PNG, JPG, GIF, TIFF, SVG, ICO, PSD, RAW and more.
Frequently asked questions
Does converting ORF to WebP lose quality?
WebP is lossy, so detail the eye barely notices is discarded to save space. The ORF's preview is a camera JPEG already, so keep the quality high to avoid stacking artefacts. The sensor's 12 bits are not used: the 8-bit camera preview is converted.
What quality should I choose for WebP?
80 to 85 is visually close to the original for most photos. Go lower for thumbnails, or switch on Lossless under More options for screenshots and graphics.
Which apps open WebP files?
Every current browser, Windows, macOS, Android, and recent Photoshop, GIMP and Affinity.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.