Add your ORF file
Drop one or more .orf files onto the converter above, or browse for them. They load into browser memory only — nothing is uploaded, so there is no size-based pricing and no server queue.
ORF to APNG
Developing a .orf camera file into .apng turns unprocessed sensor data into a finished image any app can open. Free, private, and validated — the file never leaves your browser.
Private for supported formats — processed in your browser
Runs on your deviceConvert supported files
Drop ORF files here
Batch files can each use a different output. Nothing uploads for local conversions.
Working inputs include camera RAW, browser-local audio/video, PDF, CBZ/CBR comics, office documents, ebooks, markup, 3D models, structured text, images, and archives.About converting Olympus RAW to Animated PNG
Developing a .orf camera file into .apng turns unprocessed sensor data into a finished image any app can open. An .orf file is an Olympus RAW Format photograph from Olympus and successor OM System cameras, storing the Four Thirds sensor's output before in-camera processing. The extension has covered every Olympus digital generation from early E-system DSLRs through today's OM-1 mirrorless bodies.
An .apng file is an animated extension of PNG: full 24-bit color with 8-bit alpha per frame, in a stream that plain PNG decoders read as a normal still image. It delivers the smooth, semi-transparent animation that GIF's 256-color palette never could, and it is the format behind many messaging-app sticker packs. For this route the practical draw is 16.7 million colors and real alpha per frame, versus GIF's 256 and binary transparency and backward compatible: old decoders still render the first frame — balanced against files grow quickly for long or high-motion animations, where animated WebP/AVIF or video compress far better, which is worth knowing before you commit a large batch.
Why convert ORF to APNG?
The practical trigger for this conversion is usually a mismatch: with .orf, the nonstandard TIFF header confuses generic tools that assume spec compliance. Switching to .apng buys you 16.7 million colors and real alpha per frame, versus GIF's 256 and binary transparency, which is why it is the better fit for animated stickers (Apple's iMessage and LINE both build on APNG). Because the conversion runs locally, trying it costs nothing but a few seconds of compute on your own machine.
ORF vs APNG at a glance
| Aspect | Olympus RAW (.orf) | Animated PNG (.apng) |
|---|---|---|
| Format type | Lossless — every pixel or sample is preserved exactly | Lossless — every pixel or sample is preserved exactly |
| How it stores data | tIFF-like structure with deliberate header deviations (magic bytes IIRO/IIRS rather than standard TIFF) that trip naive parsers | adds three chunk types to PNG: acTL (animation control), fcTL (frame control), and fdAT (frame data) |
| Strongest at | developing photos from Olympus and OM System Micro Four Thirds cameras | animated stickers (Apple's iMessage and LINE both build on APNG) |
| Weak spot | the nonstandard TIFF header confuses generic tools that assume spec compliance | files grow quickly for long or high-motion animations, where animated WebP/AVIF or video compress far better |
Pick APNG as the output
Select .apng in the output menu next to each file. The menu only offers targets this engine can genuinely produce, so if APNG is selectable, the route is real and validated.
Convert on your device
Press Convert. A LibRaw WebAssembly decoder demosaics the sensor data in your browser and renders a developed image ready for export.
Verify and download
Each result is signature-checked before the download unlocks, so a failed encode can never masquerade as a valid APNG file. Outputs keep the original filename with the .apng extension.
ORF to APNG questions, answered
Will converting ORF to APNG lose quality?
Since orf is lossless-oriented and apng is lossless-oriented, the conversion preserves the source content exactly as stored; no additional compression pass is applied beyond what .apng itself requires.
Is it private to convert ORF files here?
Yes — the .orf file is processed inside your browser tab and never uploaded. A LibRaw WebAssembly decoder demosaics the sensor data in your browser and renders a developed image ready for export. Close the tab and the file is gone from memory.
Where will the APNG file work?
Chrome 59+, Firefox 3+, Safari 8+, and Edge 79+ all animate .apng natively, so browser coverage is complete. Desktop support is patchier — most image editors open only the first frame — and social platforms frequently flatten or re-encode uploads, so test the target platform before committing to it.
Will the APNG file be bigger or smaller than my ORF?
It depends on the content: adds three chunk types to PNG: acTL (animation control), fcTL (frame control), and fdAT (frame data). Convert one representative file first and compare before batch-processing a large set.
What happens to the metadata in my ORF file?
In .orf, eXIF is complete and Olympus MakerNotes are unusually detailed about stabilization, focus bracketing, and computational modes; XMP normally lives in sidecars. Re-encoding through the browser pipeline does not carry embedded metadata into the output, which doubles as a privacy scrub — check the exported file if you specifically need tags preserved.