JPEG 2000 to APNG converter
Convert JPEG 2000 to APNG in seconds, free and unlimited. No upload, no sign-up, no watermark: your image never leaves your device.
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Quick answer: To convert JPEG 2000 to APNG, add the JPEG 2000 file to the iHateFiles JPEG 2000 to APNG converter and press Convert. The conversion runs in your browser, so the file is never uploaded, and it is free with no sign-up, watermark or size limit. APNG supports transparency, which JPEG 2000 never had. That helps if you plan to cut the background out afterwards.
Should you convert JPEG 2000 to APNG?
Do this when you are about to edit the file and want no further loss. Do not do it hoping to improve a JPEG 2000: APNG preserves what it is given, including the damage.
JPEG 2000 is lossy and APNG is not
Moving from JPEG 2000 to APNG stops any further loss, but it cannot undo what JPEG 2000 already discarded: that detail was thrown away when the file was first written and is not in it any more. Expect the APNG to be considerably larger while looking exactly the same, because it is now storing the JPEG 2000 artefacts faithfully too.
APNG supports transparency, but there is none to recover
APNG can store an alpha channel and JPEG 2000 cannot, so nothing is gained here automatically. The result is fully opaque. Transparency has to be cut in an editor; no converter can work out which parts of a JPEG 2000 were meant to be see-through.
Expect a much larger file
APNG stores every pixel exactly, including the compression artefacts the JPEG 2000 already has. The file will grow, sometimes by a factor of ten, without looking any better. Do this when you need to edit without further loss, not to improve the image.
JPEG 2000 and APNG side by side
| JPEG 2000 | APNG | |
|---|---|---|
| Compression | Lossy | Lossless |
| Transparency | No | Yes |
| Animation | No | Yes |
| Written here | No | Yes |
What usually goes wrong
About the JPEG 2000. It is technically better than JPEG and lost anyway. Support, not quality, decided it.
About the APNG. Converting a single still image to APNG just gives you a PNG, because there is nothing to animate.
How to convert JPEG 2000 to APNG
- Add your JPEG 2000 file. It is read from your disk and stays there.
- Check the settings. The output format is already set to APNG.
- Press convert and the APNG file is saved back to your device.
Questions
How do I convert JPEG 2000 to APNG?
Open this page, add your JPEG 2000 file, and press convert. The file is decoded and re-encoded by your own browser and saved back to your device. Nothing is uploaded.
Is this JPEG 2000 to APNG converter free?
Yes, completely. There is no account, no sign-in, no watermark and no daily limit, because there is no server doing the work. Your own device does it.
Are my files uploaded anywhere?
No. There is no upload endpoint. The conversion runs inside this browser tab, so your file never leaves your device. You can open your browser's network panel and watch: nothing carrying your file is sent.
Is there a file size limit?
No fixed limit. Because the work happens on your machine there is no server quota. The only ceiling is your own device's memory, which for video means very large files may be slow.
Will converting to APNG lose quality?
APNG is lossless, so this step throws nothing away. If the original was already a lossy format, the damage it did cannot be undone, but nothing further is lost.
Can I convert several JPEG 2000 files at once?
Yes. Add as many as you like and they are converted one after another, then offered as a single ZIP.