Convert JJ to AVIF

Tired of slow online converters? reaConverter transforms JJ to AVIF instantly — right on your desktop, no upload needed.

Online converters too slow for your JJ files? reaConverter works locally and handles unlimited batches. All processing runs locally on your PC, so your files stay private and secure.

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JJ to AVIF
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How to Convert Multiple JJ Files to AVIF?

1. Download and Install reaConverter

Download reaConverter and install it in seconds. The setup is straightforward — no complex configuration, no extra software required.

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Install reaConverter

2. Load your JJ files

Add JJ files to reaConverter. One file or a thousand, the process is the same. Everything runs locally on your machine.

You can drag-and-drop files, browse to a folder, or add entire directory trees including subfolders.

Load your JJ files into reaConverter

3. Select AVIF as output format

Select AVIF from the output format list and set your destination folder. You can also adjust quality and compression settings.

Select AVIF as output format

4. Start JJ to AVIF conversion

Click the Convert button to start. reaConverter will process all your files with the settings you selected.

Start Conversion

When finished, your new .avif files will be waiting in the destination folder.

JJ to AVIF Converter

reaConverter offers the fastest, simplest solution for converting your JJ files into AVIF in seconds - all files processed on your PC for maximum privacy and speed.

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Do more with your files

Converting JJ files for use in a workflow? reaConverter offers many ways to process files, so you can customize them according to your requirements.

Our range of editing options includes auto-processing options such as auto-rotate, auto-crop, watermarking and more. Change Color Space, copy Metadata, set DPI, manage ICC Profile, control Bit Depth.

Conversion features
Image editing

User Reviews

Average User Rating:
Last updated on January 19, 2026
"Google Photos auto-saved my pics as AVIF files that won’t open anywhere. reaConverter rescued 3 years of memories AND kept the quality. Take that, ‘innovation’!"
Derek Snyder
Derek Snyder
Satisfied Customer
"Twitch thumbnails keep saving as AVIF and my editing software freaks out. reaConverter swaps them to JPEG instantly. Now I can actually post my ‘🔥HOT TAKES🔥’ without crying over file errors."
Amy Li
Amy Li
Content Creator
"We deployed reaConverter across our department to standardize file formats for our archives. The command-line support and automation features integrated perfectly into our systems. Stellar performance and zero crashes—it just works."
David R.
David R.
IT Solutions Architect
"So simple! I just needed to convert a couple of files to another format, and for such a straightforward task, the online converter worked perfectly — delivering the files I needed in no time. Excellent service!"
Kenneth D. Carter
Kenneth D. Carter
Satisfied Customer
"I run a small design agency, and reaConverter has saved me countless hours. The batch processing is lightning-fast, and the ability to convert hundreds of files into different formats at once is a game-changer. Highly recommend!"
Mark T.
Mark T.
Satisfied Customer
"This software just works! My old laptop can’t handle Photoshop, but reaConverter flies through conversions without breaking a sweat. Wi-Fi gone? Still strong!"
Robert Williams
Robert Williams
Happy User

JJ to AVIF Conversion: FAQ

What are JJ files?

JJ is a compressed image format associated with Doodle, a graphics editing software program that used to work on Commodore 64 computers. This was one of the first brands of home computers to gain wide popularity and it was sold extensively during the 1980s. At the current moment, JJ is considered an obsolete and rare format.

What are AVIF files?

AVIF is a new image format launched at the end of 2020. AV1 Image File Format was developed by the Alliance for Open Media in collaboration with Netflix, Google and Cisco. This format was created to be an open-sourced and royalty-free image format with a super-compression efficiency. Multiple graphics compression tests show that the .avif format outperforms the JPEG, PNG and WebP image formats for its image quality to compressed file size ratio.

Can reaConverter convert JJ to AVIF?

Yes! reaConverter instantly converts .jj to .avif with perfect quality preservation. With its batch processing feature, you can convert multiple files at once in just a few clicks. You can even convert images directly from Windows Explorer using the right-click menu — fast and convenient.

Can I convert JJ to AVIF online?

If you only need to convert a few JJ files to AVIF format, feel free to try our free online free online JJ to AVIF converter — perfect for small batches with no installation needed!

How can I turn JJ files into AVIF on my computer?

The best way to change JJs to AVIFs on your PC is to install a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch files conversions, including conversion from JJ to AVIF.

How can I automate JJ to AVIF files conversion?

reaConverter supports all the most useful automation features such as right-click сonversion and Watch Folders for the most efficient automated files conversion in any software of this type.

Is there a way to convert JJ files to AVIF using the command prompt?

reaConverter provides full access to all its features via Windows command line, including a high-performance command-line jj to avif converter for batch processing.

What else can I do with reaConverter?

Convert RAW photosChange format settingsChange DPIConvert DICOM filesResize images

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