How to batch convert HEIC to JPG: a whole folder at once

Select the whole folder, not one photo at a time. Every HEIC file you choose converts in turn, and when the batch finishes you can download each JPG individually or grab the whole set as one zip file. There is no separate "bulk" mode to find, because that is just how the converter works.

How many photos at once

As many as you like, with one practical limit: your browser tab only has so much memory to work with, and a very large batch of high resolution photos can use all of it. A handful of 48-megapixel iPhone photos decoded at once is enough to push a phone browser to its ceiling, which is why conversion happens one file at a time rather than all at once, and why memory is released after each photo instead of being held until the whole batch finishes.

In practice this means: a few dozen photos convert without a second thought on any device, and if you are converting several hundred at once on a phone, doing it in two or three smaller groups is more reliable than one enormous batch.

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Why some converters cap batch size

Sites that upload your photos to a server usually cap how many you can convert for free, because each conversion costs them server time and storage. A converter that runs in your own browser has no server doing the work, so there is nothing to ration -- the only limit that exists is the one your device's own memory sets, not a number picked to push you toward a paid plan or an account.

Keeping photos in order

Files convert in the order you added them, and the zip download keeps that order and each photo's original filename, just with a .jpg extension in place of .heic. Nothing is renamed or reorganised into folders you did not create.

If one photo fails

Occasionally a single file in a large batch will fail -- usually a corrupted HEIC, or one that pushes an already-stretched browser tab over its memory limit. The rest of the batch keeps going regardless: one bad file does not stop the others from converting, and the failed one is flagged individually so you know which photo to retry, usually in a smaller group.

The short version

Drop the whole folder in, let it run, download the zip. There is no file count to worry about until you are into the hundreds on a phone, and even then the fix is just to split the batch, not to find different software.