Phase One IIQ to JPG

IIQ, short for Intelligent Image Quality, is the raw format written by Phase One medium format cameras and digital backs. It holds the sensor data from the capture, offering wide dynamic range and color depth for editing, along with a JPEG preview of the shot. Because the files are large and specialized, standard image viewers and web browsers cannot open them, which is where a quick conversion helps.

Drag your IIQ files onto the drop area or click it to browse, then set the Output JPG Quality slider, which starts at 90. Click Convert to JPG. The files are processed one after another, each status moving from Extracting to Done, and each JPG downloads as soon as it is ready with the original file name. There is no ZIP bundle; each image arrives as its own file, so your browser may ask to allow multiple downloads.

IIQ files are ideal for editing but cannot be sent straight to clients, posted, or opened on most devices. A JPG opens anywhere and is a fraction of the size. Photographers typically edit in their raw software and export final JPGs from there; this tool fills the gap before that, giving you quick viewable copies for proofing, selection, and reference straight from the camera's own preview.

Phase One backs can record IIQ L (Large), which keeps the sensor data losslessly, or IIQ S (Small), which uses Phase One's compression to cut file size with little visible difference in most scenes. For this converter the distinction does not matter, because it does not decode the sensor data at all. It looks for the JPEG preview stored in the file, which works the same way whichever IIQ option you shot.

Capture One keeps your adjustments in its catalog or sidecar files, not in the IIQ itself, and this tool reads only the IIQ. The JPG it makes is the preview stored in the raw file, so it shows the capture as the camera back rendered it, without your grading, exposure changes, crops, or masks. To get your edited look, export the JPGs from Capture One.

Use it when you need viewable images immediately and your raw software is not at hand: sending a proof to an art director from a laptop without Capture One, letting a producer or assistant pull JPGs from a drive of raw files for a contact sheet, or browsing an archive on another computer. For finished work, process the files in your raw editor.

Compared with the raw data, yes. The preview in an IIQ is already an 8-bit JPEG without the raw file's dynamic range, and its resolution is whatever the camera back stored, which may be smaller than the full sensor. Saving it again at the default quality of 90 adds very little visible loss, and you can raise the slider to 100. The result is fine for screens and proofs but not for heavy retouching.

Only files ending in .iiq are accepted. If a file shows No preview image found, the tool could not locate a usable JPEG preview inside it, which usually means the copy is damaged or incomplete. The preview could not be decoded means one was found but your browser could not read it. Copy the file again, confirm it opens in Capture One, and try a current browser. Very large batches use a lot of memory, so convert fewer files at a time if things slow down.

Yes. The tool converts your images entirely within your web browser, on your own device, so your IIQ files never leave it and no one else handles them. The JPGs are saved directly to your computer and no copies exist anywhere else. That suits commercial work under strict non-disclosure agreements. The tool claims no ownership of your images.

Not with this tool, which saves JPGs only. There are separate Phase One IIQ to TIFF and IIQ to PNG converters in the same collection that extract the same preview and save it as an uncompressed 8-bit TIFF or a lossless PNG. If you need 16-bit TIFF files for high-end retouching or print masters, export them from your raw processing software, since only a full raw conversion can produce that depth.