Colour Palette for a YouTube Channel: How to Choose One

A colour palette for a YouTube channel works with few colours and a clear role for each: an accent colour that identifies the channel, a dark and a light for backgrounds and text and, at most, a secondary. Choose it with thumbnails in mind, since that is where it shows most, and check that the text is legible: the WCAG accessibility guidelines ask for a contrast of at least 4.5:1 for normal text and 3:1 for large text. Then write it down, with its colour codes, in the channel bible, so that you have it to hand for every video.

What a palette is for on a channel

On YouTube, your videos are seen surrounded by other channels' thumbnails. A consistent palette lets people who already know you recognise your work before reading the title. YouTube's help for creators puts it this way: established brands are easy to remember because their visual elements have a consistent look, style and voice, and it is worth considering whether your profile picture and banner image are aligned and how they express the channel's identity.

The palette does not stay in the channel header. It appears in four places:

• The profile picture and the banner, the first thing seen by anyone who visits the channel.
• The thumbnails, which is where it shows most.
• The video's captions and graphics: titles, on-screen data, maps.
• The treatment of the images: whether they are warm or cool, saturated or muted.

How many colours and the role of each

Three or four colours are enough. More than the number, what matters is that each has a job and always does it. For example, for an invented channel about railway history:

Role	What it is for	Example
Accent	What identifies the channel: a band, an underline, the thumbnail's keyword.	Burgundy #8C1C13
Dark	Backgrounds and text on light colours.	Near-black #1B1B1B
Light	Backgrounds and text on dark colours.	Cream #F3E9D2
Secondary (optional)	Details, icons, a second piece of data.	Ochre #C99A2E

Three tips for choosing them:

• Start from the topic and the tone. For example, a history channel can go with warm, muted tones, and a technology one with a vivid accent on a dark background.
• Look at what channels in your topic use and choose an accent that cannot be confused with theirs.
• Test the palette small. A thumbnail at phone size says more than a full-screen colour swatch.

Contrast: making the text legible

The colour of the text is not chosen by taste, but by contrast with what is behind it. To measure it, use the WCAG, the W3C's accessibility guidelines. They are guidelines for web content, not a YouTube rule, but their thresholds serve as a reference for a thumbnail:

• Normal text: a contrast of at least 4.5:1.
• Large text: at least 3:1. Text of 18 points, or 14 points bold, counts as large.
• No rounding: a 4.499:1 does not reach the 4.5:1 threshold.

Contrast comes from the relative luminance of the two colours, and any contrast checker gives you the figure. With the example palette, these are the results calculated with the WCAG formula, rounded to one decimal place (none comes close to a threshold):

Combination	Contrast	Works for text?
White on burgundy	9.2:1	Yes, even small.
Cream on near-black	14.3:1	Yes.
Near-black on ochre	6.7:1	Yes.
White on ochre	2.6:1	No: it does not even reach 3:1.
Ochre on cream	2.1:1	No.

Note the ochre: with white text it cannot be read, but with dark text it can. The same colour works or not depending on what you put on top. And do not rely on colour alone to say something, such as red for “bad” and green for “good”: the WCAG ask that colour not be the only visual means of conveying information, and people with colour vision deficiencies perceive hues differently.

Typefaces: one or two, and bold on the thumbnail

• One family for titles and, at most, another for body text. With more, every video looks like it belongs to a different channel.
• On the thumbnail, bold, plain lettering. On a phone it is tiny: thin strokes and fancy letters disappear.
• Few words. Three to five large words can be read; a whole sentence cannot.
• The same lettering on the thumbnail and in the video's captions, so that whoever clicks recognises what they see.
• Check the licence of the font before using it in videos: not all of them allow any use.

Consistency across thumbnails, videos and channel

Consistency does not mean all the thumbnails are identical, but that it is clear they belong to the same family. A simple system:

1. One template per series: where the text goes, what colour the band is, what kind of image is behind it. Change the image and the text; keep the system.
2. The accent, always in the same role: for example, on the keyword or on a band, and not as the background one day and the lettering the next.
3. The video, matching the thumbnail: if the thumbnail is burgundy and cream, so are the video's captions.
4. The header, aligned: profile picture and banner with the same colours. The sizes and the safe area are in YouTube banner.
5. A grid check: open your channel's videos tab and look at the latest thumbnails together. If one clashes, check whether it has strayed from the palette or the template.

Everything else a thumbnail needs (size, text, how to test several) is in YouTube thumbnails.

How to write it down so it is followed

A palette that exists only in the head of whoever chose it lasts until the first video made in a hurry. Write it in the channel bible, in the audiovisual style:

• The colours, with their hexadecimal code and their role: “#8C1C13, accent; #1B1B1B, dark backgrounds; #F3E9D2, light backgrounds”.
• The typefaces, with the exact name of the family and the weight, for whoever designs the banner or the graphics. In the studio, this field does not change the lettering, as you will see below.
• The image style: warm or cool, photography or illustration, and what to avoid.
• One example of yes and one of no: a thumbnail that respects the palette and one that does not.

If you generate images with AI, that image style is what is worth repeating in every request; how to write them is covered in prompts for AI images. The full bible is in a YouTube channel bible.

What the Estudio de Canales does with the palette

In the Estudio de Canales, the palette lives in the channel bible: the audiovisual style has fields for the colours (a list), the typefaces and the image style, among others. This is what the studio does with them:

• Each scene's visuals. The AI that proposes each scene's visual receives the bible's audiovisual style and is asked to describe each image consistently with it. When the image is generated, the bible's image style is added to the request as the channel's visual style.
• The thumbnails. The studio composes three variants of 1280 × 720 pixels over the scenes' visuals, with a short text taken from the title or one you write yourself. The first colour in the list acts as the accent colour: it is the lower band of one of the variants and the background if the video has no images.
• Contrast, measured. The text is white or black depending on the background behind it (in the outlined variant, always white with a black border), and the contrast is calculated with the WCAG 2.1 formula. Each thumbnail is marked as legible if the lettering is at least 9 pixels tall with the thumbnail reduced to 168 × 94 and the contrast reaches 3:1; in the outlined variant that contrast is not required.

What is worth knowing: write the colours in six-digit hexadecimal (#8C1C13); if the first cannot be read that way, the thumbnail uses a default accent colour from the studio. The bible's typefaces do not change the lettering of the thumbnails or of the video's text captions, which use a single font from the studio, and those captions are white on a fixed dark background. And the studio does not make banners or profile pictures.

Sources consulted

Checked on 11 October 2026. We link to the original source so that you can consult the current text.

• Understanding Success Criterion 1.4.3: Contrast (Minimum) (borrador de editores de WCAG 2.2). W3C · WAI.
• Contraste del color - Accesibilidad. MDN Web Docs (Mozilla).
• Understanding Success Criterion 1.4.1: Use of Color (borrador de editores de WCAG 2.2). W3C · WAI.
• Consejos sobre el banner del canal y la imagen de perfil. Google · Ayuda de YouTube.