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[ v1.4.3 | v1.3.11 | v1.5.x | Git | Old Versions ]

Download Source Code and Documentation

We recommend to use the latest stable release FLTK 1.4.3, the first entry in the table below.

Only old software should use 1.3.11, and only very old software may need older versions. These older releases are end of life and may not even compile on new platforms. Try to use 1.4.3, many older apps can use it with little or no change.

If you really want older versions, please use the Download Old Versions page.

For more about FLTK releases and development, see this article on FLTK releases.

- - - Stable Releases - - -
Version	Filename	Size (Bytes)	MD5 Sum
1.4.3	`fltk-1.4.3-source.tar.gz`	9279104	`766435100c58520ddc3428cfd3a22e8e`
	`fltk-1.4.3-source.tar.bz2`	8460603	`995dc0a61224261bc646b6639421a3cc`
	`fltk-1.4.3-docs-html.tar.gz`	9363771	`7a76383690fd42dc24f7a947edcbefb1`
	`fltk-1.4.3-docs-pdf.tar.gz`	10770276	`bec547cb5232c6a7eaafc1791a0de10b`
	`fltk-1.4.3-fluid-docs-html.tar.gz`	2005495	`389f4af0037e3bb75a6413253ca15617`
	`fltk-1.4.3-fluid-docs-pdf.tar.gz`	1747175	`90d49fcc159949ad55aee90c713e60d8`
	`fltk-1.4.3-sha256sums.txt`	569	`efbb56b8b2847998443f23f735424844`

1.3.11	`fltk-1.3.11-source.tar.gz`	5575411	`75b2fd1aa2433e13abcbb311043eaee0`
	`fltk-1.3.11-source.tar.bz2`	4776421	`0e79fa6c4caad1d219b381330f2a0ea2`
	`fltk-1.3.11-docs-html.tar.gz`	7568708	`adc29ba4907774c8b6ad32ec8454e088`
	`fltk-1.3.11-docs-pdf.tar.gz`	8458812	`fe7ef3ca98c3c8d5c37299b7874374b5`
	`fltk-1.3.11-macOS10.11-source.tar.gz`	5576116	`52f5b44c34221398e77fa508aab671e4`
	`fltk-1.3.11-sha256sums.txt`	477	`85b86fb68583e8c61da121e37d6e805e`


- - - Weekly Development Snapshots - - -
Version	Filename	Size (Bytes)	MD5 Sum

1.5.x	`fltk-1.5.x-20250523-19684ae9d499.tar.bz2`	8273149	`c74bb0938406e39f5b3a5cd1c8ae4024`
	`fltk-1.5.x-20250523-19684ae9d499.tar.gz`	9124527	`9a7c68c4d396ee84b00af3cdb489ce3a`

Git Access

The FLTK source code is available to the public via Git. The current active development branch is FLTK 1.5, the latest stable version is 1.4.3.
These can be checked out of Git using the following command:

    git clone https://github.com/fltk/fltk.git

..or browsed with this URL:

    https://github.com/fltk/fltk

For more information on using Git see the Git Quick-Start Guide page.

Developers with write access should consult GitHub docs on how to setup their access and/or read article #1591: Git for FLTK Developers for more information.