Convert UNI to AVIF

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

Got a folder full of UNI files? reaConverter batch converts them to AVIF in minutes, not hours. Local processing means instant results, even with thousands of files.

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How to Convert Multiple UNI Files to AVIF?

1. Download and Install reaConverter

First, grab reaConverter from the download button below. Installation is fast, and the software runs offline — no account or signup needed.

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Install reaConverter

2. Load your UNI files

Add your UNI files to reaConverter. Whether it's a handful or an entire archive, the batch engine processes them efficiently.

Browse for files, drag them in, or add entire folders at once. reaConverter queues everything automatically.

Load your UNI files into reaConverter

3. Select AVIF as output format

Pick AVIF as the output format. Set the destination folder and optionally configure resolution, quality, or file naming.

Select AVIF as output format

4. Start UNI to AVIF conversion

Start the conversion with one click. reaConverter handles everything and notifies you when it's done.

Start Conversion

When the batch finishes, your AVIF files are ready in the destination folder you chose earlier.

UNI to AVIF Converter

reaConverter offers the fastest, simplest solution for converting your UNI 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 UNI 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.

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User Reviews

Average User Rating:
Last updated on January 15, 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
"An excellent program! I use it regularly in my work - it supports nearly every file format imaginable. The interface is intuitive and runs flawlessly every time."
Roger Cook
Roger Cook
Happy User
"For agencies handling confidential data, reaConverter eliminates cloud-upload risks while delivering unmatched conversion reliability. Our team uses it both in-office and remotely with identical results."
Jamal Bailey
Jamal Bailey
Satisfied Customer
"Our volunteer team uses reaConverter to prepare images for fundraising campaigns. The learning curve was minimal, and the results are professional-grade. The customer support team even helped us customize a workflow — fantastic service!"
Jason P. Bailey
Jason P. Bailey
Non-Profit Coordinator
"Finally an app that actually opens my weird files! Saves me from format frustration daily."
Kyle Brooks
Kyle Brooks
Happy User

UNI to AVIF Conversion: FAQ

What are UNI files?

UNI is a rare image format associated with Brother fax machines. Brother is a Japanese brand with a long history in manufacturing electronical equipment for the printing and advertising industry, as well as sewing and embroidering. A UNI file most likely contains the image of a document that has been sent or received via a Brother fax machine. The format is now considered obsolete.

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 UNI to AVIF?

Yes! reaConverter instantly converts .uni 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 UNI to AVIF online?

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

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

The best way to change UNIs 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 UNI to AVIF.

How can I automate UNI 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 UNI 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 uni to avif converter for batch processing.

What else can I do with reaConverter?

Change file dateConvert vector filesConvert picture color spaceConvert RAW photo formatsChange format settings

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