Monthly Archives: December 2025

Ultra7z Images/Photos to JPEG XL (jxl) Converter/Optimizer 1.05

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Ultra7z Images/Photos to JPEG XL (jxl) Converter/Optimizer
Convert and optimize your pictures JPEG/PNG/WEBP to smaller JPEG XL files (up to 10-60%)! Optimizer for JPEG XL (*.jxl) files (10-15% smaller) in lossless mode. JPEG XL (.jxl) is the next-generation, general-purpose image compression codec by the JPEG committee. It was based on Google’s Pik proposal and Cloudinary’s FUIF proposal (which itself was based on FLIF). High compression ratio – better than your programs / photo camera or smartphone. Lossless JPEG transcoding – about 20% smaller. JPEG XL is a modern image format that provides superior lossy and lossless compression for images. Using JXL, webmasters and web developers can create smaller, richer images that make the web faster. It uses program cjxl.exe. Batch processing of files (drag-n-drop). Program optimizes your file to new one with «_optimized» name ending (source file will remain intact). Reduce the size of your image files in one click with ot without quality loss! JPEG XL images are 60% smaller in size compared to JPEG and 35% to PNG.
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Ultra7z Archivers Chart

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Last update: 14.12.2025
Full table here

14.12.2025 – Tested ZCM 0.93 (-m6), Ligru-compress v0.92 (size 2048)(This project is an experiment to find an alternative to the LSTM and Transformer models for data compression.
The Li-GRU model is the simplest gated RNN architecture: in contrast to the LSTM model, it has only a hidden vector (no cell state vector, as in all other GRU models), and a single merged gate).

24.10.2025 – Tested paq8px208fix1 (-3), BSC 3.3.4, NanoZip 0.09, OpenZL 0.1.0.
MCM 0.85 failed on WAV file.

09.12.2023 – Tested Zstandard 1.5.5 (very fast decompression and good compression compared to classic ZIP),
WinRAR 7.0b2 (worse than the previous version, because strong methods have been removed),
BCM 2.03, BCM 1.65 (-b2047), PPMX 0.09, SQUID 0.03,
kanncompr 3.0 (based on artificial neural networks, very slow, but interesting).

06.12.2023 – Tested Kanzi 2.2 (new very perspective powerful compressor with many compression options and algorithms for fast and strong compression/decompression and multithreading),
paq8px150 (-3)(relatively fast mode compared to newer very slow versions).

22.03.2021 – Tested BCM 1.60, BCM 2.0a3, Lzpm 0.18
22.04.2020 – Tested FP8v6 (4th place), bizp2 1.06, bzip2 (7-zip 19.0)
05.04.2020 – Tested Razor 1.03.7, Lzpm 0.17, PowerArchiver 2019, Balz 1.50, BCM 1.51
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