Drop up to 50 RAW files into the RAW converter, pick JPG, and you get a single .zip back with all of them converted. Nothing uploads — every file is decoded on your own machine. The catch worth knowing before you start is that it works through the files one at a time, so a large batch is a real wait rather than an instant one.
Why it converts one file at a time
A RAW file is sensor data, not an image, and turning it into something viewable means demosaicing it — reconstructing full colour for every pixel. For a 45-megapixel frame the intermediate result is several hundred megabytes of uncompressed pixels sitting in memory before anything gets encoded to JPG.
Run three of those at once and a browser tab will run out of memory and die, taking the whole batch with it. So the converter deliberately processes strictly in sequence: decode one, encode it, release the memory, move to the next. It is slower than it theoretically could be, and it is the reason a batch of forty files finishes instead of crashing at file six.
What to expect while it runs
- A progress bar across the whole batch, plus a count of how many files are done
- A tick against each filename as it completes, so you can see where it has got to
- One .zip at the end containing every converted file — not fifty separate download prompts
- A single file in, a single file out: no zip if you only dropped one
Leave the tab open. The work is happening in that tab, so closing it stops the batch — there is no server carrying on in the background, which is the trade you make for the file never leaving your machine.
If one file fails
The batch carries on. A file that can't be decoded is skipped, the rest still convert, and the summary tells you how many were left out of the zip. This matters more with RAW than with ordinary images, because RAW is not one format — it is a dozen manufacturer formats that change with each camera generation, and a brand-new body can produce a file the decoder hasn't caught up with. Losing thirty-nine conversions because the fortieth was unusual would be a poor trade.
The limits, honestly
Fifty files per batch and 150 MB per file. The per-file cap is generous enough for medium-format frames; the batch cap exists because selecting an entire card of nine hundred RAWs should ask you a question rather than quietly begin an hour of work. For a shoot larger than fifty, run it in a few passes — or use desktop software, which is the honest recommendation once you are into the hundreds.
Speed depends on your machine, not ours, since your processor is doing the decoding. A recent laptop handles a typical 24-megapixel frame in a few seconds; an older or lower-powered one will take noticeably longer, and a phone longer still. If you have a shoot to get through, do it on a desktop.
Which formats work
All the common ones: Canon CR2 and CR3, Nikon NEF, Sony ARW, Adobe DNG including iPhone ProRAW, Fujifilm RAF, Olympus ORF and Panasonic RW2. Mixing formats in one batch is fine — the decoder identifies each file itself, so a card with two bodies' output on it converts in a single pass. If you want lossless output instead, RAW to PNG batches the same way.