PNG to JXL Converter

1. Upload one or more PNG files (up to 50 MB total).
2. Click 'Convert to JXL' — finishes in under 3 seconds per image.
3. Download JXL files individually, or grab all as a ZIP.

JXL's lossless mode produces files 20-35% smaller than PNG while preserving every pixel exactly — including transparency. It's a drop-in replacement for PNG that saves meaningful storage without any quality loss.

PNG is lossless, supports transparency, and works everywhere — but its DEFLATE compression is dated. JXL's lossless mode uses modern algorithms to produce files 20-35% smaller while preserving every pixel of the original, including the alpha channel. For design assets, logos, screenshots, and archives, JXL is a drop-in replacement for PNG that saves storage without any trade-offs.

The converter decodes the PNG image and re-encodes it as JXL using libjxl's lossless mode (modular). The output preserves every pixel exactly — the conversion is mathematically lossless. PNG's 8-bit alpha channel is preserved as JXL's alpha channel.

• Archiving a PNG library with 20-35% savings and no quality loss.
• Reducing storage for logos and design assets.
• Preparing PNG screenshots for long-term storage.
• Converting design exports to a modern efficient format.
• Reducing backup size for PNG-heavy folders.
• Preparing transparent assets for future-proof storage.
• Consolidating PNG archives into the most efficient lossless format.

JXL output is mathematically lossless — every pixel of the decoded PNG is preserved exactly. The file is 20-35% smaller thanks to JXL's modern compression. This is a true drop-in replacement: no quality loss, no feature loss, just smaller files.

• JXL browser support is limited — Chrome removed it in 2023.
• Very old software may not open JXL files.
• Some CMS platforms may reject JXL uploads without plugins.
• JXL adoption is still growing — not yet a universal standard.
• Some very complex PNG files may not shrink as much.

• JXL opens in Firefox, Safari (via OS support), and some image viewers.
• Native support in GIMP 2.10+, Krita 5+, and Adobe via plugin.
• Chrome removed JXL support in 2023 — Chrome users need a plugin.
• Windows 11 supports JXL with the free extensions.
• Best for archival and storage — not for universal web delivery.

• JXL lossless mode preserves every pixel — a true drop-in for PNG.
• Keep the PNG if broad compatibility matters more than size.
• JXL supports 16-bit for high-precision work.
• Batch-convert up to 50 MB at once.
• PNG transparency is preserved as JXL alpha.

JXL won't open in Chrome

Chrome removed JXL in 2023. Use Firefox, Safari, or a dedicated viewer for JXL files.

JXL file is barely smaller than the PNG

Very simple PNG files (icons, flat graphics) may already be highly optimized. The 20-35% saving is typical for photo-like PNG content.

JXL won't open in older software

Software released before 2022 may not support JXL. Keep the PNG if legacy compatibility is required.

• JPEG XL — Official Specification
• W3C — PNG Specification