How it works

Choose images
Choose Quality in Settings
Convert to JPEG XL
Download the copy or a ZIP

Transparent backgrounds

Keep see-through areas in the JPEG XL copy.

Motion or a still

Choose the animation or its first frame.

Limits Your receiving app needs to be able to open JPEG XL.

Need a JPEG XL copy of your picture?

Make a JPEG XL copy on your device. See what Quality changes before you choose a setting, then check the copy in the app where you'll use it.

FluffyBench · 6 min read · Reviewed October 15, 2026

What does JPEG XL Quality change?

JPEG XL is another way to pack a picture into a file. Think of Quality as choosing how tightly to pack a suitcase: a lower setting replaces some fine details with simpler look-alikes, while a higher setting gives detail more room.

Compare the same dahlia petals at Quality 50, 92 and 100: the lower setting smooths away more of their fine texture.

Original dahlia JPG and matched JPEG XL petal crops at Quality 50, 92 and 100, with saved-file sizes. — Rendered for illustration at unchanged dimensions; sizes are for the complete JPG and saved JPEG XL files. Quality 100 doesn't switch FluffyBench's public JPEG XL converter to lossless mode. How we reviewed · Photo: Tj Holowaychuk, Unsplash License, via Unsplash.

Converting to JPEG XL in FluffyBench

Here's the conversion in FluffyBench's JPEG XL converter, from choosing a picture to saving the .jxl copy.

Step 1. Choose the picture you want to turn into JPEG XL; keep your original for its metadata or editable parts.
1. Choose images opens your device's file picker.
Step 2. Tap the gear to open Settings; tap the same button again to close Settings after choosing your quality.
1. The gear opens and closes Settings.
Step 3. Quality 92 is the starting setting for this conversion.
1. Choose your Quality setting.
Step 4. With Settings closed, create the JPEG XL copy.
1. Convert 1 to JPEG XL starts the conversion.
Step 5. Download saves the completed .jxl file to your device.
1. Download saves this JPEG XL.

Converting several pictures? Save the completed batch together.

Step 1. For several pictures, Download all (ZIP) saves the completed JPEG XL files together.
1. Download all (ZIP) saves the batch.

What do Size and the file-size limit change?

Size changes the picture's pixel dimensions; Original leaves them unchanged.

Percentage scales the width and height together.

At Percentage 50, the saved dahlia has half the original width and height.

Rendered for illustration through FluffyBench's JPEG XL converter; dimensions and sizes come from the saved files. · Photo: Tj Holowaychuk, Unsplash License, via Unsplash.

Dimensions lets you choose a width or height in pixels.

Keep aspect ratio keeps the picture's shape when you change a dimension.

Limit each file's size lowers quality as needed to work toward an upload cap.

Enter the destination's limit in KB per file.

What does FluffyBench keep in a JPEG XL copy?

FluffyBench's JPEG XL converter keeps transparency and saves a flat picture, leaving source metadata and editable layers behind.

A JPG input becomes a fresh picture encode; you can't recover the original JPG bytes from this JPEG XL.

The transparent Earth corners stay see-through in the JPEG XL copy.

Source PNG and JPEG XL over the same checkerboard; comparison details are in How we reviewed. · Photo: NASA, Public domain, NASA-created image, via Wikimedia Commons.

For an animated GIF or WebP, Animated images chooses motion or the first picture.

Mode illustration using selected Kicking Mule frames: Keep the animation carries a sequence; Still of frame 1 keeps its first picture. · Photo: Eadweard Muybridge, Public domain in the United States, via Wikimedia Commons.

What should you check before using a JPEG XL?

Check the saved copy's size, picture detail and destination before you use it.

Original JPG and JPEG XL sizes in the conversion result. — The size rows and petal detail come from the saved Quality 92 copy. · Photo: Tj Holowaychuk, Unsplash License, via Unsplash.

3. Open the saved JPEG XL in the app where you'll use it.

Saved dahlia JPEG XL open in FluffyBench Image Viewer as a receiving-app example; if your receiving app opens the file, use it; otherwise return to To and choose its required format. — Opens? Use the copy. Won't open? Return to To and choose the format your app needs. FluffyBench's Image Viewer is the receiving-app example shown here. · Photo: Tj Holowaychuk, Unsplash License, via Unsplash.

Your destination asks for PNG or needs a transparent PNG copy?

FluffyBench's PNG converter

Save a PNG with transparency for a destination that accepts PNG.

Your destination asks for JPG?

FluffyBench's JPG converter

Save a JPG copy for that destination; transparent areas need a background color.

How we reviewed

Reviewed October 15, 2026

Current-workspace walkthroughs and dahlia illustrations use the public JPEG XL converter. The archived Denali, interface and Earth comparisons were measured October 15–16, 2026 with the earlier encoder, before the still-encoder rebuild. Google Chrome 155.0.8059.40. Windows 11 Pro; AMD Ryzen 9 5950X 16 processor cores; 32 logical processors; 127.9 GiB RAM.

Those comparisons used Quality 92 and 100, with resizing off. Stored sizes are exact bytes; displayed file sizes use decimal KB, MB and GB. Pixel comparisons check decoded RGBA values and are not perceptual quality scores.

In the verified Denali patch, 963 of 972 pixels changed at the default quality; quality 100 matched the patch. A pixel counts as changed if any RGBA channel differs. In the Earth quality-100 comparison, 0.9% of pixels changed.

Every default result was measured again on Oct 16, 2026 in Google Chrome 155.0.8059.40. Each conversion started from a fresh browser profile, so an earlier quality setting could not carry over, and the quality control read 92 before it ran. The screenshot's quality-100 result was measured again the same way; the photo and Earth quality-100 results come from the Oct 15, 2026 run, where quality 100 was set directly for each conversion.

The runs compare two settings on three selected files. They did not exercise memory retries, animation decoding, metadata retention, reversible JPEG recompression or HDR precision inputs.

Lossless encoding preserves the pixels given to the encoder; it doesn't establish an unchanged source-to-output conversion. The current public JPEG XL workspace exposes Quality, with the separate encoder lossless flag left off.

The linked archive preserves the Denali matched crops and the three-sample size comparisons. Display PNGs were decoded from the saved JPEG XL outputs after verifying their hashes. Whole-file labels use the original inputs and measured JPEG XL bytes, not the display PNG bytes.

Current-workspace screenshots and the dahlia Quality 50/92/100 ladder were rendered for illustration through the public converter, with resizing off and the downloaded JPEG XL files decoded in FluffyBench Image Viewer. Ladder sizes come from the saved JXL files, not their display PNGs. The result-check strip shows the conversion size rows, a close crop of the saved Quality 92 copy, and that file open in FluffyBench Image Viewer with a conditional return to the real To picker. These illustrations are not a new size or quality benchmark.

Image credits

Mount McKinley, viewed from near Stony Dome — NPS Photo / Tim Rains. Public domain. Resized and converted to WebP; callouts remain HTML.
The Earth seen from Apollo 17 with transparent background — NASA. Public domain, NASA-created image. Resized and converted to WebP from the pre-existing transparent derivative; alpha is retained for the checkerboard and dark-surface figure.
Macro shot photo of orange flower — Tj Holowaychuk. Unsplash License. Used as a local file input for the live checksum-tool capture; the displayed file name is dahlia-close-up.jpg.
Macro photography of orange flower — Dominik Scythe. Unsplash License. Locally resized and converted to QOI for the Image Viewer capture.
Kicking Mule sequence, frame 1 — Eadweard Muybridge. Public domain in the United States. One frame extracted from the source animation and resized to a WebP thumbnail.

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