What's the difference between ICO and JPEG XL?

ICO is the Windows icon format and the classic home of the site favicon.ico. JPEG XL is a modern, royalty-free image format with state-of-the-art compression.

What quality should I pick?

For JPEG XL, quality 75-85 is the sweet spot — small files with no visible difference from the original. Lower than 60 starts to show artifacts. Higher than 90 mostly just makes the file bigger.

When is JPEG XL the right format?

JPEG XL is a good choice for: high-quality archival images at small sizes; losslessly shrinking existing JPEG libraries; workflows where you control decoding (apps, pipelines). It is a poor choice when broad web delivery today (inconsistent browser support).

Anything surprising about ICO or JPEG XL?

Modern .ico files embed PNG frames; convert.now packs a single PNG frame per icon. And on the JPEG XL side: JPEG XL can recompress a JPEG losslessly ~20% smaller and restore the exact original.

Does this work on mobile?

Yes. The drop zone falls back to your phone's file picker, and conversions run on-device just like desktop. Large files may be slower on mobile due to CPU and memory constraints, but the workflow is identical.

What's the maximum file size?

No hard limit — the browser handles it. Files under 50MB convert in a few seconds. Larger files work but may take longer as the browser allocates memory. If you hit issues, batch in smaller groups.

Convert ICO to JPEG XL

Convert ICO to JPEG XL for smaller files with no visible quality loss. The largest resolution in the icon is used. Free, in your browser.

Drop images to convert

PNG, JPG, WebP, AVIF, JPEG XL, TIFF, BMP, GIF, SVG, HDR, ICO — any combination

Files stay on your device. Open DevTools' Network tab to verify.

Output format

JPEG XL

Quality82%

Overview

Why convert ICO to JPEG XL

JPEG XL is a more practical choice than ICO for most modern workflows: high-quality archival images at small sizes. Coming from ICO, the thing to know is that photographs and general web images (use WebP, JPG, or PNG).

Comparison

ICO vs JPEG XL: what actually differs

ICO compared with JPEG XL across encoding, fidelity, file size and support.
Attribute	ICO	JPEG XL
Compression	Lossless	Lossy or lossless
Transparency	Yes	Yes
Animation	No	Yes
Typical file size	Varies	Small
Browser support	Universally supported as a favicon — every browser reads .ico. Not used for general on-page images.	Limited — Safari 17+ supports it; Chrome and Firefox are still behind flags or pending. Great for archival and apps that control their own decoder.

How to

How to convert ICO to JPEG XL

01
Drop your ICO files
Drag one or more ICO files onto the dropzone above, or click to browse. Files stay on your device — nothing uploads.
02
Convert in your browser
convert.now decodes each ICO and re-encodes it as JPEG XL via WebAssembly. The conversion runs in a Web Worker so the page stays responsive.
03
Download the result
Download a single JPEG XL file or, for batch conversions, a zip of all converted files. Filenames preserve the originals.

Why here

Why convert.now

Private
Files stay in your browser. No upload step. Nothing for anyone to see.
Fast
No queue, no upload wait. Conversion starts the moment you drop a file.
Free
No ads. No file-count limit. No sign-up wall. Just the converter.

FAQ

ICO to JPEG XL: common questions

No. The conversion from ICO to JPEG XL runs entirely in your browser using WebAssembly. Files never leave your device. Open DevTools' Network tab if you'd like to verify — there are no network requests with file contents.

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Last updated 27 August 2026

Why convert ICO to JPEG XL

ICO vs JPEG XL: what actually differs

How to convert ICO to JPEG XL

Drop your ICO files

Convert in your browser

Download the result

Why convert.now

ICO to JPEG XL: common questions

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