# tmux resize-pane

Source: https://libtmux.org/en/tmux/3.2a/manual/resize-pane/

> Resize a pane, up, down, left or right by adjustment with -U, -D, -L or -R, or to an absolute size with -x or -y.

Resize a pane, up, down, left or right by adjustment with -U, -D, -L or -R, or to an absolute size with -x or -y.

## Syntax

```tmux-usage
tmux resize-pane [-DLMRTUZ] [-x width] [-y height] [-t target-pane] [adjustment]
```

Alias: `resizep`.

## Behavior

Resize a pane, up, down, left or right by `adjustment` with `-U`, `-D`, `-L` or `-R`, or to an absolute size with `-x` or `-y`. The `adjustment` is given in lines or columns (the default is 1); `-x` and `-y` may be a given as a number of lines or columns or followed by ‘`%`’ for a percentage of the window size (for example ‘`-x 10%`’). With `-Z`, the active pane is toggled between zoomed (occupying the whole of the window) and unzoomed (its normal position in the layout).

`-M` begins mouse resizing (only valid if bound to a mouse key binding, see [MOUSE SUPPORT](https://libtmux.org/en/tmux/3.2a/manual/full/#MOUSE_SUPPORT)).

`-T` trims all lines below the current cursor position and moves lines out of the history to replace them.

## C implementation

Internal declarations in tmux 3.2a:

* [`cmd_resize_pane_entry`](https://libtmux.org/en/tmux/3.2a/reference/c-variable-cmd_resize_pane_entry/)
* [`cmd_resize_pane_exec`](https://libtmux.org/en/tmux/3.2a/reference/c-function-cmd-resize-pane-c-cmd_resize_pane_exec/)

## Use from a library

Each API describes its own defaults, errors and execution model.

* [Python](https://libtmux.org/en/py/latest/reference/libtmux-pane-resize/)
* [TypeScript](https://libtmux.org/en/ts/latest/reference/pane-pane-resize/)
* [Rust](https://libtmux.org/en/rs/latest/reference/pane-pane-resize/)
* [Go](https://libtmux.org/en/go/latest/reference/tmux-pane-resize/)
* [Java](https://libtmux.org/en/java/latest/reference/io-github-libtmux-pane-pane-resize/)
* [C#](https://libtmux.org/en/csharp/latest/reference/libtmux-pane-resizeasync/)
* [Swift](https://libtmux.org/en/swift/latest/reference/server-resize\(_-width-height-\)/)
* [Ruby](https://libtmux.org/en/ruby/latest/reference/libtmux-pane-resize/)
* [Lua](https://libtmux.org/en/lua/latest/reference/libtmux-pane-resize/)

tmux sources and license

Syntax comes from `tmux 3.2a list-commands`. See the [global options](https://libtmux.org/en/tmux/3.2a/manual/full/#DESCRIPTION) for sockets and configuration, and [command syntax and targets](https://libtmux.org/en/tmux/3.2a/manual/full/#COMMANDS).

Behavior is taken from the [tmux 3.2a manual](https://github.com/tmux/tmux/blob/85893888497c5077979bc7557fb970ee5e3d13d9/tmux.1).

[Command declaration](https://github.com/tmux/tmux/blob/85893888497c5077979bc7557fb970ee5e3d13d9/cmd-resize-pane.c#L36)

```
Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>

Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
```