To properly experience our website, you will need to use an alternate browser or upgrade to a newer version of internet Explorer (IE9 or greater).

The website utilizes responsive design to provide convenient experience that conforms to your devices screen size. In order to get the best possible experience our LG.COM website please follow below instructions.

If you’re using Internet Explorer 8 or earlier, you will need to use an alternate browser such as Firefox or Chrome or upgrade to a newer version of internet Explorer (IE9 or greater).

If you’re using Internet Explorer 9 and higher, turn off your Internet Explorer browser’s “Compatibility View settings” by following steps below:

  • Right click at the top of your browser and make sure the “Menu Bar” option is selected
  • Select “Tools” from the menu bar and then select “Compatibility View settings”
  • In the pop-up menu uncheck all three boxes and click “Close”
  • Your browser window will automatically refresh and you’ll be ready to go
Skip to Contents Skip to Accessibility Help

25" Class 21:9 UltraWide® IPS LED Gaming Monitor (25" Diagonal)

  • 25UM56-P

Key Features

  • 21:9 UltraWide® Full HD (2560x1080)
  • Dynamic Action Sync
  • Black Stabilizer
  • SRGB Over 99%
  • 4-Screen Split
  • ENERGY STAR® Qualified

Gaming Gets Real

LG’s UltraWide monitor immerses you in its panoramic scale, true-to-life
color and brilliant clarity. Gamers never sit still – no problem, LG’s
IPS screen looks great from virtually every angle. Dynamic Action Sync
lets you catch every moment in real time. LG’s Black Stabilizer brightens dark scenes so the enemy can't hide.

UltraWide 21:9

UltraWide® 21:9

The UltraWide 21:9 aspect ratio makes movies and games more immersive than ever. Need to get some work done, too? All of that UltraWide real estate makes it easy to view multiple documents at the same time, so you don't need to flip back and forth between them.

IPS with sRGB Over 99%

IPS (In-Plane Switching) technology enhances the performance of liquid crystal displays. Response times are shortened, color reproduction is improved, and users can now view the screen at virtually any angle. sRGB is the standard color space of ideal color reproduction.

Dynamic Action Link

Dynamic Action Link

Minimize input lag with Dynamic Action Sync so you can catch every single moment in real-time.

Black Stabilizer

Black Stabilizer

Keep visibility even in dark scenes. LG's Black Stabilizer sense dark scenes and helps make it brighter so that you can find the enemies hiding and waiting to attack your player in the dark.

Game Mode

Game Mode

Set your game mode optimal gaming conditions. There are 3 gamer modes, 2 First-Person-Shooter modes and even and RTS pre-set mode so you can choose the best mode for you.



Multitasking doesn't have to mean shuffling back and forth between windows*. With a single click, the 4-Screen Split feature divides the screen into as many as four customizable segments, two-by-two. Now you can see four different windows at the same time.

Disclaimer: *Screen Split software runs on Windows Vista/7/8 and Mac OS

Flicker Safe

Flicker Safe

New dimming technology is applied to minimize the flicker level that may cause eye fatigue. With almost-zero flicker* technology, looking at your computer screen for longer periods of time can be more comfortable.

* LG's new Flicker Safe system is certified by TUV for its almost-zero flicker

ENERGY STAR® Qualified

ENERGY STAR® Qualified

Earning the ENERGY STAR® rating means that a product meets strict energy efficiency guidelines set by the US Environmental Protection Agency and the Department of Energy. For monitors, it means they save energy both in standby and active (powered on) modes. ENERGY STAR-qualified monitors use about 24% less energy than standard units.

Screen Size 25"
Resolution 2560 x 1080
Panel Type IPS
Aspect Ratio 21:9
Brightness 250 cd/m2
Color Gamut sRGB over 99%
Response Time 5ms GTG
Refresh Rate 60Hz
Contrast Ratio (DFC) 5M:1
Black Stabilizer Yes
Game Mode Yes
Reader Mode Yes
Factory Calibration Yes
Dual Controller Yes
Screen Split Yes
ENERGY STAR® Qualified Yes
UPC 719192198180

What People Are Saying

Rated 1 out of 5 by from Monitor only lasts a year monitor begins to die out after a year, cant handle playing a game without the monitor crashing and begin flickering only a blue screen when trying to change from a game to the desktop. and then the desktop always shows a flickering light when just showing the desktop screen.
Date published: 2017-12-19
Rated 5 out of 5 by from Great Gaming Monitor I bought this monitor several months ago, and it still amazes me. The graphics are excellent. I love the fact that it has a gaming mode. I love the space I now have. I use it in unison with another LG monitor, and the space I have is amazing! Excellent product.
Date published: 2017-09-24
Rated 5 out of 5 by from Real estate. I bought this monitor for the real estate. I wanted a larger monitor for doing post production video work that did not require the same space as a TV monitor and this fits the bill perfectly. After mounting it on a VESA arm it's my favorite setup to date. The price is right too!
Date published: 2017-09-22
Rated 5 out of 5 by from Great monitor! As an audio engineer and video editor, this ultra-wide monitor has greatly increased my productivity. It allows me to run my desktop at a higher resolution and see much more at one time than I ever could before. I also appreciate how crisp and accurate the colors are. Great product!
Date published: 2017-09-22
Rated 3 out of 5 by from Works as advertised. Put briefly; the monitor works as advertised, however there will be problems when using applications that cannot recognize 21:9 display ratio or resolutions of 2560x1080. Software that cannot recognize said configuration will definitely not work.
Date published: 2017-06-25
Rated 5 out of 5 by from Great Monitor With Great Features I've had this monitor for about 4 months now and it is working perfectly. I would highly recommend this monitor to people that want plenty of screen real estate for multitasking, or people who want a big screen for gaming. It has different modes for dimming the screen to make looking at the screen for long periods of time easier on your eyes along with a great gaming mode. Overall, this product is great for the price and it is definitely worth the money.
Date published: 2017-01-23
Rated 5 out of 5 by from very nice to have this monitor up to now the screen is big and there is no problem in playing games
Date published: 2017-01-10
Rated 5 out of 5 by from Great Monitor for an Excellent Price I bought this monitor two months ago to replace my old unit. The monitor works great whether I'm gaming or browsing the web. The ultrawide aspect ratio means you have a lot of horizontal space for multitasking as well. This is a great product at a reasonable price, so definitely consider buying it.
Date published: 2016-11-21
  • y_2018, m_1, d_19, h_5
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.6
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_17
  • loc_en_US, sid_MD05208640, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_lg
  • bvseo_sdk, java_sdk, bvseo-
  • CLOUD, getReviews, 4ms

We're here to support you with our product.

View 25UM56-P Product Support

Contact us for any support inquiries.


Ask your questions. Share your answers.
Please first review the detailed product information and help guides in the Product Support section for this product prior to posting a question.

How many Volts can this monitor withstand? I am from New Zealand and had it shipped over. 

Asked by: SamPB
We do not recommend our units be used outside of the USA, but it is 19 V, 1.6 A. ^AC
Answered by: amber
Date published: 2017-12-11

My laptop doesn't have a CD drive, and i can't find any software to download for the monitor. How can i get the contents (if possible, step by step) so i can try out the features for this monitor?

Asked by: Tiny0125
We appreciate your interest in this monitor. More information would be needed as to what software you are trying to download. Please contact our Customer Interactive Center at 800-243-0000 for further assistance.
Answered by: NeilE
Date published: 2017-08-30

Is the monitor 144hz ?

Asked by: Grank48
Our offices, in the United States, do not have specific product information units released in Indonesia. In order to obtain such information, it is recommended to check our subsidiary’s website, at
Answered by: NeilE
Date published: 2017-01-31

Hi I brought this last month and i love the monitor. though its not a big focus as i'm using it as a monitor, i want to confirm if I do have a hadware problem. Audio isn't coming out from the MONITOR, does the HDMI supplied with this supports audio?

Asked by: eryson
The monitor does not have speakers
Answered by: EpicFP
Date published: 2018-01-06

What type of HDMI is do these inputs support?  1.1, 1.2, 1.3a, 1.4a or 2.0? I hear that the older HDMI cant support more than 24fps so 60 hertz would be kinda useless. I need to make sure i can shoot 60fps trough the hdmi so i can match the 60 Hertz.

Asked by: ToxicSquirrelX
The HDMI ports on the ENERGY STAR® Qualified LG 25" Class 21:9 UltraWide® IPS LED Gaming Monitor (25" Diagonal), Model # 25UM56-P are version 1.4a...^IFV
Answered by: LGJoel
Date published: 2016-03-04

Which video cards does this monitor support ? (From reviews people seem to be having trouble with their video card not working with this monitor.)

Asked by: saraw109
We appreciate your interest in this monitor and its features. This model is designed to connect to a computer, or other device, using one of two HDMI ports. The software allows for dual controllers and split screens. While we do not have a recommendation for a particular video card, whichever card is used should be compatible with this, as well as a 2560x1080 resolution, a 21:9 aspect ratio, a 60Hz refresh rate, and a 5ms GTG response time.
Answered by: NeilE
Date published: 2016-02-16

Is there a way to display the two HDMI inputs on split screens simultaneously? example: cable box & computer

Asked by: barry6
We appreciate your interest in this monitor and its operations. At this time, there is no known reason why this connection would not be possible. Please contact our Customer Interactive Center at 800-243-0000 if this does not resolve the matter.
Answered by: NeilE
Date published: 2016-01-15

I bought one two weeks ago. I only used it two times. When i got back fro vacation i tried turning it on. And it doesnt want to turn on. Its been over an hour and still doesnt turn on. Any suggestions 

Asked by: Bradley012345678910
Our offices, in the United States, do not have product information for South Africa. In order to obtain such information, it is recommended to check our subsidiary’s website, at
Answered by: NeilE
Date published: 2016-01-13
  • y_2018, m_1, d_19, h_5CST
  • bvseo_bulk, prod_bvqa, vn_bulk_2.0.6
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_20
  • loc_en_US, sid_MD05208640, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_lg
  • bvseo_sdk, java_sdk, bvseo-
  • CLOUD, getContent, 388ms