GIF87 to JNG Converter
FileFlip converts GIF87 to JNG entirely inside your browser, using ImageMagick compiled to WebAssembly. The file is never uploaded to a server: it is read off your disk, converted on your own machine, and saved back by the browser. That means no file-size limit, no queue and no account.
How do I convert a GIF87 file to JNG?#
- Drop your GIF87 file onto the converter at the top of this page, or click it to pick one from your computer. You can add as many as you like.
- Leave the target set to JNG and the conversion starts on its own. FileFlip downloads 14.1 MB of WebAssembly the first time and nothing after that, then runs ImageMagick on your own machine.
- Save the JNG file. Your browser writes it straight to your downloads folder, because there was never a server holding it.
Does converting GIF87 to JNG lose quality?#
Yes, once. GIF87 keeps everything and JNG does not, so this is the first time the file meets a lossy encoder. At high quality the difference is hard to see, and it is worth keeping the GIF87 original, because every later re-save of the JNG loses a little more.
Is it safe to convert GIF87 files online?#
Yes, because nothing is uploaded. FileFlip converts GIF87 files inside the browser tab you already have open, using WebAssembly builds of the same engines a desktop converter would install. Your file is read from your own disk into the page's memory, and no request carrying it is ever made.
You do not have to take that on trust. Open your browser's network panel, run a conversion, and you will see the engine come down and your file go nowhere. There is no upload, no server-side copy, no retention window, and no account tied to what you converted.
How FileFlip works lists every engine, its version and its download size, and shows how to check for yourself that nothing leaves your machine.
What GIF87 to JNG actually does to the file#
Converting GIF87 to JNG runs on ImageMagick, downloads 14.1 MB of WebAssembly the first time and nothing after that, encodes a lossless source with a lossy encoder for the first time, and drops extra images.
| Engine | ImageMagick |
|---|---|
| Conversion path | One step: GIF87 → JNG |
| Downloaded to your browser | 14.1 MB, once, then cached by your browser |
| Quality | Lossy, first generation |
| You get back | One file |
| Where it runs | In a background worker, so the page stays responsive |
What survives the conversion
| What is in the file | This conversion | Why |
|---|---|---|
| Extra images | Dropped | The target format has nowhere to put it. |
Worth knowing before you start:
- ImageMagick is asked for a single image, so only the first frame, page, or icon size is read
What is a GIF87 file?#
A GIF87 file follows the original 1987 Graphics Interchange Format specification that CompuServe published two years before GIF89a added transparency and animation, so it stores a single, fully opaque image using the same LZW compression and 256-color palette as any other GIF.
There's essentially no reason to target GIF87 today; write a plain GIF, which is GIF89a, instead unless a specific tool or test needs the older header.
Convert to GIF89a or PNG when the image needs transparency or animation, since GIF87 supports neither.
What is a JNG file?#
A JNG file holds a single still image whose colour data is compressed as baseline or progressive JPEG inside the same chunk-based container PNG uses, with an optional PNG- or JPEG-encoded alpha channel for transparency.
There's little reason to create a new JNG file today; the format only makes sense inside an existing MNG animation that already mixes JPEG and PNG frames.
Convert JNG to JPG or PNG for anything meant to display in a browser, since none of the major browsers render JNG natively.
GIF87 to JNG questions people ask#
What is a GIF87 file?
A GIF87 file follows the original 1987 Graphics Interchange Format specification that CompuServe published before adding transparency and animation in 1989's GIF89a. It stores a single, fully opaque static image.
What's the difference between GIF87 and GIF89a?
GIF89a, released in 1989, added the features people now associate with GIF: transparent backgrounds, multi-frame animation, and comment or application metadata blocks. GIF87, the original 1987 version, has none of those and can only hold one static, opaque image.
Do modern browsers still support GIF87 files?
Yes. GIF89a was designed as a backward-compatible extension of GIF87, so every GIF reader that handles modern animated GIFs also reads a plain GIF87 file without any issue.
What opens a JNG file?
JNG files open in GIMP, Gwenview and ImageMagick-based tools, but no mainstream web browser renders them. That gap is the main reason JNG never spread beyond the small set of software built around the MNG format.