Convert SYNU to AVIF

Convert SYNU to AVIF without quality loss. reaConverter gives you full control over resolution, compression, and output settings.

Manual SYNU to AVIF conversion wastes hours. reaConverter automates the process — just add files and click Convert. Everything happens offline on your computer — no uploads, no cloud risks.

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SYNU to AVIF
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How to Convert Multiple SYNU Files to AVIF?

1. Download and Install reaConverter

reaConverter is a standalone Windows app — download, install, and start converting SYNU files in under two minutes.

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Install reaConverter

2. Load your SYNU files

Open reaConverter and add your SYNU files. You can load individual files, entire folders, or even nested subfolders.

Drop your SYNU files into the window or use File menu to browse and select folders.

Load your SYNU files into reaConverter

3. Select AVIF as output format

Choose AVIF as the target format. Pick a destination folder or let reaConverter save files alongside the originals.

Select AVIF as output format

4. Start SYNU to AVIF conversion

Hit Convert and let reaConverter do the work. The progress window shows status for each file in real time.

Start Conversion

After conversion, find your AVIF files in the output folder. Click 'Show converted files' to open it directly.

SYNU to AVIF Converter

reaConverter offers the fastest, simplest solution for converting your SYNU 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 SYNU 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 25, 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
"Finally an app that actually opens my weird files! Saves me from format frustration daily."
Kyle Brooks
Kyle Brooks
Happy User
"This converter delivers exceptionally quick format conversions with reliable results every time."
Brian White
Brian White
Happy User
"Security was our top concern when evaluating file conversion tools. reaConverter’s offline mode and role-based access controls let us lock it down for sensitive environments. No unexpected network calls or bloat — just clean, fast conversions. Even passed our pen-testing scans without a hitch."
Marcus White
Marcus White
Healthcare IT
"An efficient all-in-one solution for image conversion and light editing, designed for maximum user-friendliness."
Elena Anderson
Elena Anderson
Happy User

SYNU to AVIF Conversion: FAQ

What are SYNU files?

SYNU is a rare graphics format associated with an old image processor known as Synthetic Universe. An alternative extension used by this is program is SYN. Both formats are considered old and obsolete, so opening them using regular image viewers is probably difficult.

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 SYNU to AVIF?

Yes! reaConverter instantly converts .synu 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 SYNU to AVIF online?

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

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

The best way to change SYNUs 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 SYNU to AVIF.

How can I automate SYNU 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 SYNU 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 synu to avif converter for batch processing.

What else can I do with reaConverter?

Convert vector filesConvert picture color spaceConvert GIS filesChange file dateConvert DICOM files

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