CGM to MNG Converter

Convert CGM metafiles to MNG animated images online

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PNG-Quality Frames

MNG delivers animation with PNG-level quality. Convert CGM graphics to MNG for sequences that need full color and transparency.

Universal Access

Access the CGM to MNG converter from any device with a browser. No platform or OS restrictions — just internet access.

Private Conversion

CGM uploads are deleted after processing. MNG results are removed from Convertio servers within 24 hours.

How to convert CGM to MNG

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose mng or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your mng file right afterwards

About formats

CGM (Computer Graphics Metafile) is a vector graphics standard defined by ISO 8632, first published in 1987 and developed through the ISO/IEC JTC 1/SC 24 committee. The standard defines a device-independent format for storing and transferring two-dimensional vector graphics, raster images, and text. CGM supports three encoding methods: character encoding (compact text representation), binary encoding (efficient machine-readable form), and clear-text encoding (human-readable for debugging). The format describes graphical primitives including polylines, polygons, ellipses, circular arcs, splines, and text with associated attributes for color, line style, fill patterns, and clipping boundaries. CGM found its strongest adoption in technical documentation, particularly in aerospace, defense, and industrial sectors where long-term archival and precise technical illustration are critical. One advantage is formal standardization — as an ISO standard, CGM provides vendor-neutral, specification-driven interoperability guaranteed across compliant implementations. The format's adoption in specialized industries is another practical strength: WebCGM, a W3C profile of CGM, became the mandated illustration format for interactive electronic technical manuals in the aerospace industry (ATA iSpec 2200), ensuring CGM's continued relevance in aviation maintenance documentation. While general-purpose vector work has moved to SVG and PDF, CGM persists in regulated industries where certified, standards-based graphics interchange is mandatory.
Initial release: 1987
MNG (Multiple-image Network Graphics) is an animation and multiple-image format designed as the animated counterpart to PNG, with its specification reaching version 1.0 on January 31, 2001. Developed by Glenn Randers-Pehrson and members of the PNG development community, MNG extends PNG's capabilities with support for frame-based animation sequences, slide shows, complex sprite overlays, and JNG (JPEG Network Graphics) frames for lossy compression of photographic content within the same container. An MNG file consists of a series of chunks (following PNG's chunk-based architecture): MHDR and MEND chunks bookend the datastream, with embedded PNG or JNG images as individual frames and control chunks (DEFI, FRAM, LOOP, ENDL, TERM, BACK, BASI, CLON, PAST, DISC, SHOW) directing playback timing, looping behavior, layer compositing, and memory management. The format supports both full-frame replacement and delta (difference) updates for efficient encoding of animations with static backgrounds, as well as object-based animation where sprites are defined once and repositioned across frames. One advantage is technical sophistication: MNG provides a level of animation control that GIF and APNG cannot match — frame-accurate timing, nested loops, conditional branches, interframe compression, and mixed lossy/lossless content within a single animation. The PNG-based foundation ensures lossless quality with full alpha transparency for each frame. MNG is supported by ImageMagick, GIMP, and various media players, though browser support was limited, which led to APNG's emergence as a simpler alternative for web animation.
Initial release: January 31, 2001

Frequently Asked Questions

Why convert CGM to MNG?

MNG extends PNG with animation support. CGM to MNG can be useful when creating animated sequences from technical drawing frames.

What opens MNG files?

Firefox (historically), Konqueror, IrfanView, and ImageMagick handle MNG files. Support varies across modern browsers.

Is MNG similar to GIF?

MNG supports animation like GIF but with full PNG-quality frames — more colors, transparency, and compression options.

Is CGM to MNG free?

Yes — standard conversion is free on Convertio. Premium plans cover larger files and batch requirements.

Can I convert on a Mac?

Absolutely. Convertio is browser-based and works on macOS, Windows, Linux, and mobile platforms.