Convert X11 to FLIF

Why upload sensitive X11 files to online converters? reaConverter processes everything locally — convert to FLIF with zero cloud risk.

reaConverter transforms X11 files to FLIF quickly and reliably. Drag in folders, set your options, click Convert, done. No cloud accounts, no file uploads, no complicated setup. Just install and start converting.

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How to Convert Multiple X11 Files to FLIF?

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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2. Load your X11 files

Add your X11 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 X11 files into reaConverter

3. Select FLIF as output format

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

Select FLIF as output format

4. Start X11 to FLIF conversion

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

Start Conversion

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

X11 to FLIF Converter

reaConverter offers the fastest, simplest solution for converting your X11 files into FLIF in seconds - all files processed on your PC for maximum privacy and speed.

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Do more with your files

Converting X11 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 19, 2026
"The step-by-step video makes conversion foolproof. I'd recommend this to my grandma - it's that well-explained!"
DeShawn M. Thompson
DeShawn M. Thompson
Happy User
"I'm really impressed with this software - it converts files between formats incredibly fast!"
Lin Zhang
Lin Zhang
Happy User
"I firmly believe working with JPEG — the universal format supported by all devices and apps—is the wisest choice. reaConverter handles these conversions flawlessly."
Ava Thomas
Ava Thomas
Happy User
"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

X11 to FLIF Conversion: FAQ

What are X11 files?

The X11 format is associated with the X Windows System, which is used — among others — on UNIX and Linux platforms. X11 files are bitmaps storing X Window screen caps and can come in several variations. The format is considered rare and might be difficult to open.

What are FLIF files?

FLIF (Free Lossless Image Format) is a royalty-free format launched at the end of 2015 as "work in progress" with the aim of offering a better alternative for storing lossless images than the existing PNG, WebP, BPG, JPEG2000 and JPEG XR. FLIF provides similar image quality as the other extensions, but in a file size than can be up to 74% smaller. The new format uses a form of the Adam7 algorithm for compressing images, offering progressive interlacing that allows users to obtain a reasonable encoding of an image even from a partial download.

Can reaConverter convert X11 to FLIF?

Yes! reaConverter instantly converts .x11 to .flif 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 X11 to FLIF online?

If you only need to convert a few X11 files to FLIF format, feel free to try our free online free online X11 to FLIF converter — perfect for small batches with no installation needed!

How can I turn X11 files into FLIF on my computer?

The best way to change X11s to FLIFs 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 X11 to FLIF.

How can I automate X11 to FLIF 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 X11 files to FLIF using the command prompt?

reaConverter provides full access to all its features via Windows command line, including a high-performance command-line x11 to flif converter for batch processing.

What else can I do with reaConverter?

Convert CAD formatsSet picture bit depthConvert vector imagesChange image color spaceConvert PDF

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