Open .ORF files online
A .orf file is an Olympus RAW photograph — the unprocessed sensor capture from the Four Thirds E-system DSLRs (the E-1 of 2003 onward), through the PEN and OM-D mirrorless generations, to today's OM System cameras. The imaging line changed owners and name in 2021–2022 — Olympus's camera business became OM System — and the format carried over unchanged: an E-1 file and an OM-1 file are both .orf, twenty years apart.
ZipTool develops .orf files entirely in your browser: LibRaw — the open-source RAW engine behind many desktop converters — compiled to WebAssembly demosaics the sensor data, applies the camera's white balance, and renders an sRGB image you can download as PNG. The engine (~1.1 MB) downloads once from this site's own domain and is cached; your photograph never leaves your device.
What is a `.orf` file?
ORF is structurally a TIFF-style RAW — a header and tag-directory layout in the family almost every maker's format belongs to — and it has stayed compatible across two decades of bodies. Four Thirds sensors (17.3 × 13 mm, a 2× crop factor) mean ORF files run smaller than same-generation full-frame RAWs, and develop quickly even on modest hardware.
The OM-D line's signature feature lands as .orf too: Hi-Res Shot. The camera shifts the sensor in half-pixel steps and merges eight exposures into one file with far more resolving power than the sensor's nominal megapixel count — 40-megapixel output from a 16-megapixel sensor on the E-M5 Mark II in 2015, 80 from 20 today, plus a handheld variant on recent bodies that needs no tripod. Those merged files are ordinary ORFs as far as a viewer is concerned; they just take a little longer because there are more pixels.
Bodies differ in bit depth — 12-bit on older models, 14-bit on the current generation — and in whether the photosite data is compressed. None of that changes how a file opens here; the develop reads whatever the camera wrote.
- OM System and Olympus photographers culling PEN and OM-D shoots on any machine
- Reviewing Hi-Res Shot files at full resolution without Olympus Workspace
- Opening a .orf from a zip or a client delivery with nothing installed
- Identifying an unlabeled .orf from an old drive — the meta line names the camera
How to open a `.orf` online
Open ZipTool in a new tab, then drop your .orf onto the page — or click to browse for it, or paste a URL. The file opens in the RAW develop viewer, which runs LibRaw compiled to WebAssembly inside your browser tab — a full demosaic with camera white balance, not the embedded JPEG preview, read entirely on your device.
- Drag your
.orfonto the page — or click to browse, or paste a URL. - It opens immediately in the RAW develop viewer, which runs LibRaw compiled to WebAssembly inside your browser tab — a full demosaic with camera white balance, not the embedded JPEG preview. No install, no sign-up.
- Read, search, or copy it. Your file never leaves your browser.
Open `.orf` without uploading
Most "open orf online" sites work by uploading your file to a server and processing it there. ZipTool does the opposite: it loads its parser once, then reads your .orf locally in the browser tab. The contents stay on your device.
You can prove that in seconds. Open the page, press F12 for DevTools, switch to the Network tab, and open your file — no request carrying the file's contents is sent. You can also turn off Wi-Fi after the page loads and the file still opens. See security and privacy for the full picture.
Frequently asked questions
Which cameras write .orf files?
Three eras, one extension: the Four Thirds E-system DSLRs (E-1 in 2003 through the E-5), the PEN and OM-D mirrorless lines from 2009 and 2012, and — after Olympus's camera business became OM System — the current OM-1 and OM-5 bodies, which write the same .orf. Other brands' RAWs open here too; see the online RAW viewer.
How do I open a .orf file online?
Drop the .orf on this page — or click to browse, or paste a URL. The developed image appears with its camera model, dimensions, and lens info; the status bar offers a Download .png of the full-resolution render. The first open fetches the LibRaw engine (~1.1 MB) once from this site's own domain; afterwards it is cached.
Do Hi-Res Shot files open here?
Yes — a Hi-Res Shot file is an ordinary ORF with more pixels, and it develops like any other. Expect the develop to take a beat longer on 80-megapixel output; the zoom goes past 100% so you can judge the extra detail, and the Download .png export is full resolution.
Is .orf still a current format — didn't Olympus stop making cameras?
The brand changed; the format did not. Olympus transferred its imaging business to OM Digital Solutions in 2021, and the cameras have been sold as OM System since — the OM-1 line is current and writes the same .orf files the older Olympus bodies did. Nothing about the extension or its structure changed in the handover.
Does viewing my ORF upload the photo?
No. The develop engine is WebAssembly running in the page; your file is read locally and the pixels are rendered in the tab. The only network fetch is the engine itself (~1.1 MB, one time, from ziptool.app — not a third-party CDN), which matters for unreleased or client work. Press F12 → Network and watch: no request carries your photo. The online RAW viewer develops the whole camera-RAW family the same way.