BriskFile

Compress JXL images

Drop your JPEG XL files below and choose how small you need them. Everything happens on your device.

JPEG XL can re-compress an existing JPEG about 20 per cent smaller with no further loss at all, which no other format does. Browser support is the catch: Safari has it, Chrome does not.

Nothing is uploaded. Your files are read by this page and processed by your own processor. Open the Network tab and watch — you will not see them leave.

What compressing JXL actually does

JPEG XL was designed to replace JPEG, and it is better at nearly everything: smaller files at the same quality, proper transparency and high bit depths, and a lossless mode that beats PNG. It can even recompress an existing JPEG losslessly — typically 20% smaller, and the original file can be reconstructed exactly.

The catch is support. Browser adoption has been slow and inconsistent, so a .jxl is a poor choice for anything you send to another person or put on a public website today. It is an excellent choice for archiving, where the only thing that matters is that your own software can read it.

Getting a good result

  • JXL is at its best for archives, where size and fidelity matter and you control what opens the file.
  • Do not use it for anything a stranger has to open — no shipping browser decodes it reliably, and most desktop software does not either.
  • The lossless mode typically beats PNG by 20–35% on the same image, with no pixel changes at all.
  • Effort settings above 7 take dramatically longer for very little further saving.

Hitting an exact file size

Upload forms, government portals and job applications frequently demand a file "under 200KB" and reject anything over it, without telling you by how much. Tick Aim for a specific file size and BriskFile searches for the highest quality that still fits, re-encoding up to eight times to find it.

The result is always under your limit, not near it. A file three kilobytes over the cap is rejected exactly as firmly as one three megabytes over.

Questions

Can browsers display JPEG XL yet?

Not reliably. Support has been added and withdrawn repeatedly across browsers, so a .jxl on a public page will fail for most visitors. Use WebP or AVIF for the web and keep JXL for archives.

Is JPEG XL better than AVIF?

For photographs at high quality and for lossless work, generally yes, and it encodes considerably faster. For very aggressive compression AVIF usually wins. In practice the deciding factor is not quality but support, and there AVIF is far ahead.

What BriskFile will not do to you

  • Your files never leave your device

    Every conversion runs in your browser. Open DevTools, watch the Network tab, and you will see no upload — because there is not one.

  • No account, no email, no watermark

    Nothing to sign up for and nothing stamped on your images. There is no step between choosing a file and getting it back.

  • No limits at the download button

    No daily cap, no file counter, no "upgrade to download". If the tool starts a job, it finishes it.

  • Checkable, not just claimed

    Open the Network tab and convert something — nothing goes out. Or load the page, disconnect, and watch it keep working: the tool is already on your machine, and your file never leaves it.