Add option "Save to the same folder as the original". Specifying it manually every time is not very convenient.

Add option "Delete original", and the choice - to the Recycle or in the usual way. There should also be a fairly reliable verification of the success of the conversion, preferably based on several parameters:

1. Report from the codec about success.
2. Checking the existence of the new file.
3. Check if the file size is 0 (I have encountered similar cases several times when using other converters and other file formats).
4. Ideally, it would not be superfluous to check the validity using a special tool (I don’t know which one). Or try decoding with the same codec.

Need to add an icon for the program.

Add option "Clear the list of files after successful conversion".

Add button "Remove all files from list". Currently, such a button remove only the selected files, which is quite strange, since usually need to delete the entire list.

Disadvantage: if the "multi-threading" option is selected, then at the end of the process not displayed: total size of incoming files, files after conversion, and the difference in percentage. More precisely, it is displayed only for each thread separately. Of course, need the sum of all the numbers.

Add the option "If a file with the same name already exists, then add a number to the new file". It is also advisable to provide for the situation where, for example, the file "file-1.jxl" already exists, so that the converter creates the file "file-2.jxl" rather than "file-1-1.jxl". Or, better, instead of a number, an identifier and some random set of characters, for example “file-#double-H7u3.jxl”. The identifier makes it easy to find these files and rename them in the desired way - manually or automatically using one of the specialized programs.

Make sure that the program version is displayed in the "About" tab.

P.S. Sorry for bad English, I have to use Google translator.

This is a long-standing and considerable problem. I've been looking for a long time for program that can handle these characters and I know that the reason is in the JXL encoder, since its creators lack the skill or desire to fix it.

However, the solution is actually quite simple. Just need to add code that will analyze the name + path and, if it detects non-ASCII characters, it will copy the file to a temporary folder on the same disk, changing the name to a “safe” one, for example, “file”, converting, then moves the result to the original folder and restores the original name. I don’t know why no one has done this before.

What do you think about it? Can you provide your converter with this functionality?

First, I’ll say thank you for taking into account the wishes last time and improving the converter.

So, I decided to test the new functions and this is what happened, I’ll tell you in order:

1. I added a folder with several PNG files, activated the option "use the same folder for output". Started the process. Now the folder contains the same files in JXL format.

2. Without changing anything, I started the process again. The converter skipped all the files, reporting that they already existed.

3. Now again, but with the "Output file suffix" option activated, I wrote "%rnd%" in the input field. As a result, I received files like "file-123456.jxl". Here I immediately had several comments:

A) "%rnd%" you'd better add to the corresponding input text field so that it is the default and also as an example. Otherwise, most users probably won't even know about this feature.

B) "%rnd%" already contains "-". I think it would be better if this thing generated only random characters, without the "-". And the input field will contain "-%rnd%" by default. This way, those who prefer "_" can use it by simply editing it to "_%rnd%" or whatever.

C) With some surprise, I discovered that the sequence of characters is not generated every time for each file, but is the same for the conversion session. In general this is not important, it just seems to me that the point of making it unique is to make it truly unique - that is, for each file.

D) It is advisable to add a setting for the length of the sequence of characters 4-8, for example "%rnd4%" will create 4 characters, and "%rnd8%" - accordingly 8. Probably, 4 characters will be enough for most users. (However, you can safely ignore this, I just tend to notice flaws and like to finish everything to the ideal).

4. I launched it again, the process went as expected, creating several files with a different set of characters.

5. I disabled the "Output file suffix" option and ran it again. The program should have skipped existing files (which were created during the first conversion), but instead I saw something like "file-%rnd%.jxl" in the folder. This is definitely a bug.

6. One more time. Now the program reported that files with the same name (with the suffix "-%rnd%.jxl") already exist and skipped them.

Very useful option for photos or comics with random file names

I have jxl image with integrated xmp data inside (lightroom). After conversioning jxl to jpg this data (editions history, keywords, faces and e.t.c. is gone).

For example image with face data (jxl and decoded jpg)
image.zip

Original jxl have next integrated xmp data

Converted to jpg do not have xmp inside.

Is it possible to save integrated xmp data?

Is it possible to add mac os support?
Have m1 air, can help with it

It would be great to have an option that would create the same folder and subfolder structure as input

Hi,
downloaded the jxl executables from here: https://artifacts.lucaversari.it/libjxl/libjxl/latest/
jxl-batch-converter starts but gives the following error messages:
Error: djxl is found but not executable!
Error: cjpegli is found but not executable!
Error: djpegli is found but not executable!

Interestingly, cjxl.exe is not mentioned in the errors. The tools run fine on commandline (ix x64 & x86)

If have many images and cpu with many cores it is will by grate have option to load cpu 100% converting images not one by one but multiple