PEF to JFIF Converter

PEF to JFIF: From Pentax Raw to a Plain JPEG

PEF is Pentax's own raw format — sensor data in a TIFF-structured file, written by Pentax and Ricoh-era bodies alongside the DNG option the camera menu also offers. It is not a legacy format: Ricoh's published specification for the PENTAX K-3 Mark III lists its file formats as "RAW (PEF/DNG), JPEG (Exif 2.3)" and its raw depth as "RAW (14bit): PEF, DNG", so current bodies still write it.

JFIF is the other end of the same photograph's life. It stands for JPEG File Interchange Format — the 1992 document that told everyone how to actually put JPEG-compressed data in a file, formalised nearly twenty years later as ITU-T Recommendation T.871, approved on 14 May 2011, and published by ISO/IEC as 10918-5. In practice a .jfif file is a JPEG. Same compressed data, same decoders, different filename.

PEF and JFIF at a Glance

How to Convert PEF to JFIF

1. Upload Your PEF Files: Drag them onto the page or click "Add Files". Several raw files can be queued and they all convert with the same settings.
2. Choose a Quality Preset: The list runs Highest, Very High (Recommended), High, Medium, Low, Very Low and Lowest. On a raw source, Very High is the sensible starting point — the compression artefacts of anything below High are much more visible on a freshly demosaiced file than they are on a JPEG that has already been through a camera's own processing.
3. Set the Resolution, or Target a File Size: Image resolution opens on Keep original; Preset Resolutions set the height and let the width follow, while Width x Height pins both. If a size limit is what actually constrains you, switch File Compression to Specific file size and name a figure — the Auto Scale toggle lets the pipeline reduce dimensions to reach it rather than only lowering quality.
4. Convert and Download: Click Convert and save the .jfif. Files are uploaded over an encrypted connection, developed and encoded on our servers, and deleted automatically after a few hours — no sign-up, no watermark.

What the Raw File Gives Up

Converting raw to JPEG is a one-way development, and it is worth being explicit about what is spent.

If any part of that list matters to you, develop the raw properly first. Free, open-source raw developers — RawTherapee, which describes itself as a cross-platform raw image processing program, and darktable, an open-source raw developer that edits non-destructively — let you set exposure, white balance and tone curve deliberately and then export. This page is the right tool when you want the picture out of the raw file quickly and correctly, not when you want to grade it.

For a still that keeps more of the raw file's range, PEF to TIFF writes an uncompressed or losslessly compressed image instead, and PEF to PNG is the lossless option when the destination is a screen rather than a print pipeline.

Frequently Asked Questions

Is a .jfif file different from a .jpg file?

Not in any way that affects you. Both are JPEG: the same compressed image data, decoded by the same code in every browser, operating system and image editor. JFIF is the name of the specification that defined how to store a JPEG bitstream in a file, so .jfif is a perfectly correct extension for a JPEG — it is simply an uncommon one. You can rename the download to .jpg and nothing about the file changes. The reason people meet the extension at all is that some Windows applications have historically saved or downloaded JPEGs under it.

Why does my software not recognise the .jfif file?

Because it is deciding what to do by extension rather than by content, and .jfif is rare enough that some applications never registered it. Renaming the file to .jpg fixes it immediately and losslessly. If you would rather not deal with it, PEF to JPG produces the identical conversion under the conventional extension.

Will the JPEG look like the preview on the back of my camera?

Close, but not identical. The camera's own JPEG engine applies Pentax's picture modes, sharpening, noise reduction and lens corrections in a way that only Pentax's own software fully reproduces. A generic raw development renders the same exposure and white balance faithfully but makes its own choices about sharpening and colour rendition. If matching the in-camera look exactly is the goal, Ricoh's Digital Camera Utility is the tool that will do it.

Which quality preset should I use for a raw file?

Very High for anything you intend to keep, and Highest if the file is going to be printed or edited further. Raw conversions are unusually revealing of JPEG artefacts because the image has not already been through a camera's noise reduction and sharpening, so ringing around high-contrast edges and blocking in smooth gradients show up at quality levels that would look fine on a re-saved camera JPEG. Medium and below are for the web, and only when size genuinely matters more than the picture.

Does PEF or DNG make a difference to the conversion?

Not to the result here. Both hold the same sensor data from the same exposure — DNG is Adobe's openly documented raw container and PEF is Pentax's own, and Pentax bodies let you choose between them in the menu. Both are decoded the same way on our servers. DNG's advantage is longevity and universal software support; PEF's is that it is what the camera writes by default on many bodies. If you are choosing for the future, shoot DNG; if you already have PEFs, this page reads them fine.

Can I convert a whole shoot at once?

Yes. Queue as many PEF files as you like and they convert with the same quality and resolution settings, which is normally what you want for a single shoot. Raw files are large, so the upload will be the slow part — a hundred frames from a current Pentax body is several gigabytes. If you are only after web-sized versions, setting a Preset Resolution before converting does not speed up the upload, but it does make the download far smaller.

Why is the JPEG so much smaller than the PEF?

Because almost everything that makes a raw file big is discarded. A PEF stores 14 bits per channel of undemosaiced sensor data losslessly, so it keeps information you cannot see and detail you have not yet decided how to render. A JPEG stores 8 bits per channel of a single rendered interpretation, compressed by throwing away the high-frequency detail the eye is least sensitive to. A tenth of the size is normal; a twentieth at moderate quality is not unusual.

Does the conversion strip my copyright and camera information?

Generally not. JPEG files carry Exif, so the capture data recorded by the camera — model, lens, exposure settings and any copyright field you set — normally travels across into the output. What does not survive is anything specific to the raw format itself: the Pentax maker-note blocks, the raw processing instructions and the sensor calibration data have nowhere to live in a JPEG. If a particular field matters legally, verify it in the output before deleting the original.

How are my files handled during conversion?

Your PEF files are uploaded over an encrypted connection, developed and encoded on our servers, and both the uploads and the resulting JPEGs are deleted automatically after a few hours. Nothing is shared or made public, and there is no sign-up, no watermark and no account required.