Underwater Background Maker
Make an underwater background in your browser: water that darkens with depth, light rays slanting down from the surface, a net of light just under the surface, rising bubbles, drifting specks and a sea floor with swaying weed silhouettes. Everything is drawn from numbers by our own code, not photos, and there are no fish or characters, so it works behind any text or product. Set how fast the water darkens, the number and angle of the rays, the bubbles, the floor height and the weeds, and pick the colours. The same seed always gives the same scene at a given size; press New seed for a new one. Download a PNG at 12 screen sizes from 4K desktop to phone, a full-page print PDF (Letter or A4) or a 300 DPI print PNG. Nothing is uploaded.
100% private — everything runs in your browser. Everything runs in your browser; nothing is uploaded.
The download is drawn at full size from the same seed and settings as the preview, so it has the same layout with finer detail. The same seed always gives the same picture at a given size.
Scene
Colours
Size
Runs in your browser with our own code: nothing is uploaded or saved. You may use what you make here, including commercially, with no credit needed.
How to make an underwater background
- Choose a preset, such as tropical shallow water, deep blue, sun rays, rising bubbles or a weed forest.
- Set the depth (how fast the water darkens), the light rays, their brightness and the sun angle.
- Set the surface light, the bubbles, the sea floor height, the weed strands and the drifting specks.
- Pick the colours near the surface, in deep water, for the light and for the sea floor; change the seed until you like it.
- Pick a screen size and download the PNG, or download the print PDF or the 300 DPI print PNG.
What you can use it for
- Desktop and phone wallpapers
- Video call and stream backgrounds
- Ocean-themed party invitations, posters and flyers
- Classroom and slide backgrounds
- Website hero sections
- Printed backdrops and craft paper
The 12 presets
| # | Preset | Light rays | Bubbles | Bottom |
|---|---|---|---|---|
| 1 | Tropical shallow water | 9 | Yes | Floor and weeds |
| 2 | Deep blue | 7 | Yes | Open water |
| 3 | Sun rays from the surface | 12 | Yes | Open water |
| 4 | Rising bubbles | 4 | Yes | Open water |
| 5 | Weed forest | 8 | Yes | Floor and weeds |
| 6 | Turquoise lagoon | 10 | Yes | Floor and weeds |
| 7 | Night water | 5 | Yes | Floor and weeds |
| 8 | Green sea | 7 | Yes | Floor and weeds |
| 9 | Pastel water | 8 | Yes | Floor and weeds |
| 10 | Sea floor with rocks | 6 | Yes | Floor and weeds |
| 11 | Violet deep | 9 | Yes | Floor and weeds |
| 12 | Clear water, few bubbles | 6 | Yes | Open water |
Each preset only fills in the fields; change any colour, setting or the seed afterwards. Every preset has the depth fade and at least one of rays, bubbles or a sea floor.
The controls
| Control | Range |
|---|---|
| Depth | 0 to 100 |
| Light rays | 0 to 16 |
| Ray brightness | 0 to 100 |
| Sun angle | -30 to 30 |
| Surface light network | 0 to 100 |
| Bubbles | 0 to 100 |
| Sea floor height | 0 to 100 |
| Weed strands | 0 to 40 |
| Drifting specks | 0 to 100 |
Download sizes
| Size | Pixels |
|---|---|
| 4K desktop | 3840 × 2160 px |
| QHD desktop | 2560 × 1440 px |
| Full HD | 1920 × 1080 px |
| Ultrawide | 3440 × 1440 px |
| Phone | 1080 × 2400 px |
| Large phone | 1290 × 2796 px |
| Tablet portrait | 2048 × 2732 px |
| Square post | 2048 × 2048 px |
| Story | 1080 × 1920 px |
| Header banner | 1500 × 500 px |
| Video call background | 1920 × 1080 px |
| Slide | 1920 × 1080 px |
| Print, US Letter | PNG 2550 × 3300 px (300 DPI); PDF 1700 × 2200 px (200 DPI) |
| Print, A4 | PNG 2480 × 3508 px (300 DPI); PDF 1654 × 2339 px (200 DPI) |
Which tool to use
| You want | Use |
|---|---|
| A whole underwater scene with rays, bubbles and a sea floor | Underwater Background Maker (this page) |
| Plain water and caustic textures, seen from above | Water Texture |
| Wavy layered shapes for page dividers | SVG Wave Generator |
For plain water and caustic textures, try the Water Texture maker; for wavy section dividers, the SVG Wave Generator.
More free tools
More background and wallpaper tools?
Background makers and image tools that run privately in your browser, with no sign-up and no watermark.
Frequently asked questions
Is this a photo?
No. Every ray, bubble and silhouette is drawn by our own code from numbers, so the picture is yours to use.
Will the same seed give the same scene?
Yes. The same seed and settings give the same pixels at the same size. Our tests draw each preset twice and compare a hash of the PNG; a different seed gives a different picture.
What does Depth do?
It sets how quickly the water turns from the surface colour to the deep colour going down the picture. Our tests check that the water gets steadily closer to the deep colour from top to bottom.
Are there fish or sea creatures?
No. The scene has water, light, bubbles, specks, a sea floor and weed silhouettes only, so you can add your own text or pictures on top.
Do the bubbles stay inside the picture?
Yes. Every bubble is drawn whole inside the picture; our tests check each one.
Can it tile without a seam?
No. The water darkens from top to bottom, so the picture is made to fill one screen or page, not to repeat.
Is it free?
Yes. There is no sign-up, no watermark and no limit.
Is anything uploaded?
No. Everything is drawn by JavaScript in your browser and nothing is sent anywhere.