Drop a folder, or click to choose images
JPEG · PNG · WebP · AVIF · HEIC · SVG · GIF · JXL · TIFF
Files never uploaded · 100% client-side · I cannot see your photos · Privacy policy
Pipeline ready: PNG → JPEG XL (any input still accepted)
Asset Melt Studio is a PNG to JPEG XL converter that runs entirely on your device. Next-gen lossless-friendly PNG successors — JPEG XL can be a smaller lossless still than PNG, with a lossy mode when you want it. Browser support is still the catch.
Drop one PNG or a whole folder — the pipeline is already set to JPEG XL using JPEG XL via @jsquash/jxl. That is the PNG to JPEG XL workflow people search for: convert PNG to JPEG XL without an upload, then resize, crop, or hit a size budget (when the codec allows) before you download.
Input is not locked to PNG: you can still open JPEG, PNG, WebP, AVIF, HEIC, GIF, and more in the same session. The PNG to JPEG XL URL simply pre-selects JPEG XL so png to jxl jobs start in one click.
A phone UI PNG archived as lossless-friendly JPEG XL.
~34% smaller lossless
Before · PNG380 KB — Oxipng UI still
After · JPEG XL250 KB — Lossless-style JXL
Step 1
You are already on the PNG to JPEG XL converter. Output is pre-selected as JPEG XL. You can still drop mixed formats — the PNG to JPEG XL URL is a starting point, not a file-type lock.
Step 2
Drag PNG images onto the studio, click to choose, or paste. Folder drops queue nested images. Then process — PNG to JPEG XL encoding runs in Web Workers on this device.
Step 3
Use the before/after scrubber until the PNG to JPEG XL result looks right. Adjust quality, crop, or resize, then download one JPEG XL or a ZIP of the batch.
| Topic | PNG | JPEG XL |
|---|---|---|
| Web support | PNG universal | JXL limited |
| Lossless size | Oxipng | Often smaller JXL |
| Size budget | Skipped | Supported |
| Metadata out | Optional keep on PNG | Pixels only |
| Fallback | Not needed | Keep PNG/WebP |
PNG to JPEG XL (PNG to JXL) is for experiments, future archives, and tooling that already reads JXL. It is not a drop-in for every `<img>` tag in 2026.
Lossless JXL often beats PNG on the same bitmap. Lossy JXL competes with AVIF/WebP depending on the image.
Asset Melt encodes via @jsquash/jxl in a worker. JXL export is pixels-only (no EXIF round-trip).
| Source | Before | After | Note |
|---|---|---|---|
| UI PNG lossless | 220 KB PNG | ~160 KB JXL | Typical lossless win |
| Photo PNG | 4 MB PNG | Lossy JXL much smaller | Or use AVIF |
| Icon 16px | 1 KB PNG | ~1 KB JXL | Not worth a format fight |
Drop PNG. JXL out. Effort slider trades time for bytes.
Size budget works on JPEG XL.
Keep PNG if you need universal support.
Archival experiments and JXL-aware pipelines.
When you want smaller lossless than PNG.
Skip PNG to JXL for general web until your audience can decode it (or you ship a fallback).
For lossless-style, use high quality / lossless settings and inspect. For web-like lossy, compare against AVIF — support will be the deciding factor.
Higher JXL effort = slower, often smaller.
Also export WebP/AVIF if this is a trial, not a cutover.
Do not delete PNG masters.
Image processing is 100% client-side in your browser with WebAssembly. Your photos are not uploaded, I cannot see or recover them, and sampled session replay is UI-only and does not include image pixels (media is blocked). The site still sends usage analytics and crash reports — details are on the privacy page. That includes every PNG to JPEG XL job — the converter never needs your files on a server.
Upload compressors send your bitmap to someone else’s API. Asset Melt keeps png to jxl on this device. Session replay, if sampled, is UI-only and does not include image pixels.
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