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This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The WebGL2RenderingContext.blitFramebuffer() method of the WebGL 2 API transfers a block of pixels from the read framebuffer to the draw framebuffer.


void gl.blitFramebuffer(srcX0, srcY0, srcX1, srcY1,
                        dstX0, dstY0, dstX1, dstY1,
                        mask, filter);


srcX0, srcY0, srcX1, srcY1
A GLint specifying the bounds of the source rectangle.
dstX0, dstY0, dstX1, dstY1
A GLint specifying the bounds of the destination rectangle.
A GLbitfield specifying a bitwise OR mask indicating which buffers are to be copied. Possible values:
A GLenum specifying the interpolation to be applied if the image is stretched. Possible values:
  • gl.NEAREST
  • gl.LINEAR

Return value



gl.blitFramebuffer(0, 0, canvas.width, canvas.height,
                   0, 0, canvas.width, canvas.height,
                   gl.COLOR_BUFFER_BIT, gl.NEAREST);


Specification Status Comment
WebGL 2.0
The definition of 'blitFramebuffer' in that specification.
Editor's Draft Initial definition for WebGL.
OpenGL ES 3.0
The definition of 'glBlitFramebuffer' in that specification.
Standard Man page of the (similar) OpenGL API.

Browser compatibility

FeatureChromeFirefoxEdgeInternet ExplorerOperaSafari
Basic Support5651.0(No)(No)43(No)
FeatureAndroidChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
Basic Support(No)(No)(No)(No)(No)(No)(No)

See also

Document Tags and Contributors

 Contributors to this page: fscholz, teoli, JeremiePelletier
 Last updated by: fscholz,