Are my M4V files uploaded anywhere?

No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and convert something. You will see the page load, plus the analytics and advertising the site is paid for with — and nothing carrying your file.

Is converting M4V to JXL free?

Yes. There is no account, no watermark and no limit on how many files you convert — it runs on your own machine, so it costs us nothing to let you. Files up to 100 MB are handled in the browser.

Does converting M4V to JXL lose quality?

No. JXL stores the same content without discarding anything, so the result is identical in quality to the original. One frame, at full resolution. A still from compressed video carries that compression — a fast-moving moment looks softer than a static one, which is the video’s own encoding rather than anything this conversion does.

Do I need to install anything to open JXL files?

No installation is needed for the conversion itself — it runs in the browser you already have. Opening the JXL afterwards needs whatever software normally handles JPEG XL on your device.

M4VtoJXL

Convert M4V to JXL

Up to 100 files at once. Mixed formats are fine.

You can convert M4V to JXL free and without an account: drop the file above and the JXL is ready to download in a second or two. The conversion happens inside your own browser, so the file is never uploaded — it works on Windows, Mac, Linux, iPhone and Android, and keeps working with the network switched off.

What M4V and JXL are for

Apple's MP4 variant. Identical in practice unless the file carries copy protection.

The JPEG successor. Can repack existing JPGs 20% smaller without touching image quality.

How to convert M4V to JXL

Drop your M4V file onto this page, or click to pick one.
Choose JXL as the target. The conversion runs inside your browser — the file is never uploaded.
Download the finished JXL file.

M4V vs JXL: what changes

M4V compared with JXL
	M4V	JXL
Full name	iTunes Video	JPEG XL
File extension	.m4v	.jxl
Media type	video/x-m4v	image/jxl
Compression	Lossy — file size is bought with quality	Either, depending on the setting

Quality: Nothing is lost. The result holds exactly the same picture, text or data as the original.
Where it runs: This conversion runs inside your browser. Your file is never uploaded, and it works with the network disconnected.
What can be lost: One frame, at full resolution. A still from compressed video carries that compression — a fast-moving moment looks softer than a static one, which is the video’s own encoding rather than anything this conversion does.

M4V to JXL: common questions

Are my M4V files uploaded anywhere?: No. This conversion runs entirely inside your browser, so the file never leaves your device. You can confirm it yourself: open the network tab of your browser's developer tools and convert something. You will see the page load, plus the analytics and advertising the site is paid for with — and nothing carrying your file.
Is converting M4V to JXL free?: Yes. There is no account, no watermark and no limit on how many files you convert — it runs on your own machine, so it costs us nothing to let you. Files up to 100 MB are handled in the browser.
Does converting M4V to JXL lose quality?: No. JXL stores the same content without discarding anything, so the result is identical in quality to the original. One frame, at full resolution. A still from compressed video carries that compression — a fast-moving moment looks softer than a static one, which is the video’s own encoding rather than anything this conversion does.
Do I need to install anything to open JXL files?: No installation is needed for the conversion itself — it runs in the browser you already have. Opening the JXL afterwards needs whatever software normally handles JPEG XL on your device.