A Flash Player emulator written in Rust https://ruffle.rs
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dowgird 5ac4f4358d avm2: Added flash.net.URLVariables 12 hours ago
.cargo chore: Add a note to cargo config about RUSTFLAGS in the web build 4 months ago
.github ci: Yes, even me. 2 days ago
core avm2: Added flash.net.URLVariables 12 hours ago
desktop build(deps): bump url from 2.2.2 to 2.3.1 2 weeks ago
exporter core: Remove all synchronous preloading from core. 2 weeks ago
render wgpu: Remove `width` and `height` fields from our `Texture` wrapper struct 1 day ago
scanner core: Remove all synchronous preloading from core. 2 weeks ago
swf swf: Extract `Rectangle` to a separate file 3 days ago
tests avm2: Added flash.net.URLVariables 12 hours ago
video render: Treat `update_texture` with invalid `BitmapHandle` as an error 2 weeks ago
web web: Fix config with `serde-wasm-bindgen` 2 days ago
wstr wstr: statically check the size of WString 1 month ago
.gitattributes chore: Cleanup .gitattributes 2 years ago
.gitignore chore: Cleanup .gitignore 2 years ago
CODE_OF_CONDUCT.md chore: Update CODE_OF_CONDUCT.md 2 years ago
CONTRIBUTING.md docs: Minor updates (#7264) 3 months ago
Cargo.lock web: Switch to `serde-wasm-bindgen` over `serde-serialize` feature (#8080) 3 days ago
Cargo.toml video: Add software video crate, moved VideoDecoder to it 3 weeks ago
LICENSE.md chore: Update copyright 6 months ago
PKGBUILD ci: Update PKGBUILD for AUR package 1 year ago
README.md docs: Minor updates (#7264) 3 months ago
rustfmt.toml chore: Add rustfmt.toml and rustfmt pass 3 years ago



Rust Build Status Web Build Status Ruffle npm Ruffle AUR Ruffle Discord
website | demo | nightly builds | wiki


Ruffle is an Adobe Flash Player emulator written in the Rust programming language. Ruffle targets both the desktop and the web using WebAssembly.

Project status

Ruffle is in the proof-of-concept stage and can currently run early Flash animations and games. Basic ActionScript 1.0/2.0 support is in place and improving; ActionScript 3.0 support is forthcoming. For more info, read the project roadmap.

Using Ruffle

The easiest way to try out Ruffle is to visit the web demo page, then click the "Browse..." button to load an SWF file of your choice.

Nightly builds of Ruffle are available for desktop and web platforms including the browser extension.

For more detailed instructions, see our wiki page.

Building from source

Follow the official guide to install Rust for your platform.

You must also have Java installed, and available on your PATH as java.


If you are building for a Linux platform, make sure that the GTK 3 development packages are installed on your system. (Ubuntu: libgtk-3-dev, Fedora: gtk3-devel)

Use the following command to build and run the desktop app:

cargo run --release --package=ruffle_desktop

To run a specific SWF file, pass the SWF path as an argument:

cargo run --release --package=ruffle_desktop -- test.swf

To build in debug mode, simply omit --release from the command.


Ruffle Desktop can be built from our Homebrew Tap:

brew install --HEAD ruffle-rs/ruffle/ruffle

Note: because it is HEAD-only, you'll need to run brew upgrade --fetch-HEAD ruffle each time you want to update.

Web or Extension

Follow the instructions in the web directory for building either the web or browser extension version of Ruffle.


If you have a collection of "real world" SWFs to test against, the scanner may be used to benchmark ruffle's parsing capabilities. Provided with a folder and an output filename, it will attempt to read all of the flash files and report on the success of such a task.

cargo run --release --package=ruffle_scanner -- folder/with/swfs/ results.csv


If you have a swf and would like to capture an image of it, you may use the exporter tool. This currently requires hardware acceleration, but can be run headless (with no window).

  • cargo run --release --package=exporter -- path/to/file.swf
  • cargo run --release --package=exporter -- path/to/file.swf path/to/screenshots --frames 5


  • core contains the core emulator and common code
  • desktop contains the desktop client (uses wgpu-rs)
  • web contains the web client and browser extension (uses wasm-bindgen)
  • scanner contains a utility to bulk parse swf files
  • exporter contains a utility to generate PNG screenshots of a swf file


You can support the development of Ruffle via GitHub Sponsors. Your sponsorship will help to ensure the accessibility of Flash content for the future. Thank you!

Sincere thanks to the diamond level sponsors of Ruffle:

Newgrounds.com CPMStar Sébastien Bénard Crazy Games Cool Math Games The New York Times Armor Games Onda Educa TwoPlayerGames.org wowgame.jp Matt Roszak Doll Divine Movavi


Ruffle is licensed under either of

at your option.

Ruffle depends on third-party libraries under compatible licenses. See LICENSE.md for full information.


Ruffle welcomes contribution from everyone. See CONTRIBUTING.md for help getting started.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you shall be dual licensed as above, without any additional terms or conditions.

The entire Ruffle community, including the chat room and GitHub project, is expected to abide by the Code of Conduct that the Rust project itself follows.