BMP to JXL converter
Turn BMP files into JXL for free. The conversion runs entirely in your browser, so your pictures are never uploaded anywhere.
How to convert BMP to JXL
- Add your BMP files. Drop one or more .bmp files on the box above, or tap it to pick them from your device.
- Let it convert. Each picture is converted to JXL in about a second, right in your browser.
- Download the JXL. Press Download next to each file. Nothing was sent to a server, so close the tab and it's gone.
What is a BMP file?
BMP is the old uncompressed Windows bitmap format. It stores raw pixels, so files are huge but simple.
What is JXL?
JPEG XL (JXL) is a modern image format designed to replace JPEG. It compresses better than JPG, supports lossless, HDR and transparency, and can repack existing JPGs without loss.
Why convert BMP to JXL?
BMP is great for very old software and some industrial tools, but enormous files and almost no web support. JXL is the better choice for excellent quality per byte and true lossless mode; keep in mind Chrome, Edge, Firefox and most apps can't open JXL yet, so you often need a JPG or PNG copy.
Will I lose quality?
JXL uses lossy compression tuned so the difference is invisible at normal use. We use high-quality settings by default, and you can raise the quality slider before converting.
Private by design
Most online converters upload your file to their servers. This one doesn't: the converter itself is loaded into your browser and works offline from there, so your pictures never leave your phone or computer.
Questions
Is this BMP to JXL converter free?
Yes, completely free, with no sign-up, no watermark and no daily limit.
Are my BMP files uploaded?
No. The conversion happens inside your browser on your own device. Nothing is sent to us or anyone else.
Can I convert BMP to JXL on iPhone or Android?
Yes. It works in Safari, Chrome and other modern browsers on phones and tablets.
Can I convert several files at once?
Yes. Drop as many as you like; they are converted one after another and each gets its own download button.
Is there a file size limit?
No fixed limit. Very large pictures (100+ megapixels) may be slow on phones.