Solid Onyx Background #353839
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Solid Onyx background details
With hex #353839 (rgb(53, 56, 57)), this deep, low-light neutral tone sits around 195° on the color wheel. Its muted, powdery appearance reads as grounded and modern on screen. Use the values and preview above to test it in the layout where it will actually appear.
Onyx and jet: blacks one degree apart
Hold Onyx against Jet Black and the difference is almost subliminal: #353839 versus #343434, a couple of points more green and blue. That whisper of cool tint is the entire personality of Onyx, a near-black that leans toward slate, like polished stone under gallery lighting rather than a wall of soot.
The cool cast makes it the more modern-feeling dark of the two. It suits tech branding, dashboards, and dark UI surfaces where a warm black would feel dusty, and it gives metallic tones and saturated jewel colors the slight chill of showroom lighting, sharpening them instead of absorbing them the way a true black can.
A palette that works with Onyx
Silver and platinum echo onyx's cool undertone in lighter values, while emerald and teal are the jewel tones that look sharpest against its slate-leaning darkness.
Quick specs
- HEX
- #353839
- RGB
- rgb(53, 56, 57)
- HSL
- hsl(195, 4%, 22%)
- Readable text
- #FFFFFF
background-color: #353839;
Where Onyx shines
- Balanced UI backdrops where onyx keeps typography readable
- Product renders or mockups that need a premium, gallery-like wall color
- Brand palettes that mix cool and warm elements without clashing
Practical tips
- Stick with off-white (#F5F5F5) or pure white typography for clarity (the Copy RGB/HEX buttons above make it easy to grab the exact values).
- Use the adjustment sliders to nudge the hue when you need a complementary accent.
- The download tool exports PNG/JPEG files up to 7680×7680, so you can drop the color straight into mockups or presentations.
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Onyx background FAQs
Can I download a solid Onyx background?
Yes. This solid onyx background is available as free PNG and JPEG downloads for HD desktop, 4K, phone, square, and custom sizes.
What is the HEX code for Onyx?
Onyx uses HEX #353839 and rgb(53, 56, 57). You can copy both values from this page or adjust the shade before exporting a background image.
Is Onyx better for phone or desktop wallpaper?
Onyx is especially useful for desktop wallpapers, OLED-friendly screens, presentation backdrops, and low-distraction setups. The phone preset also works well for a darker lock screen.