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ASCII DNA Helix Animation – Live Background
A rotating double helix drawn with A and T bases and dashed base pairs. Science-themed ASCII background, free PNG and HTML download.
About the DNA effect
DNA renders a vertical double helix. Each row places two strands, one marked A and one marked T, at positions given by two sine waves exactly half a turn apart, so the strands wind around each other as they run down the screen. On every second row the gap between the strands is filled with dashes, drawing the base-pair rungs of the ladder. As time advances, the phase shifts and the helix appears to rotate in place, with rungs shrinking to nothing where the strands cross and stretching wide at the outer edges. It is an instantly recognisable science motif built from nothing but letters and dashes. Use it for biology, biotech, health or education projects, or for a science-fair poster. Cyan and green feel clinical and digital; pink and purple are friendlier for outreach and classroom material.
Ideas for using DNA
  • Background for biology lessons, science fairs or lab websites
  • Animated header for biotech, health or genetics startups
  • Classroom screen during a genetics or bioinformatics lecture
Download as wallpaper
Get the DNA ASCII wallpaper at the exact resolution of your phone, tablet or monitor. Pick a size below to open the wallpaper panel, choose color and character size in the toolbar, then download a PNG, save it to Photos on mobile, or record a 6 second video loop. See every effect side by side on the ASCII wallpapers page.
Download options
  • Wallpaper — exact-size PNG for phone, iPhone, tablet, 4K desktop, ultrawide, square, story, watch or social card, Save to Photos on mobile, and a 6 s MP4/WebM loop.
  • PNG snapshot — single image frame with your chosen color, glow and font size. Use it as a wallpaper, slide background, or social media share.
  • Animated HTML — self-contained .html file with the generator inlined. Open it in any browser and the animation runs offline indefinitely.
  • TXT frame — the current ASCII frame as plain text. Drop it into a README, code comment, or any place that supports preformatted text.
  • Copy ASCII — copy the current frame to clipboard for instant paste anywhere.
  • Copy embed — an iframe snippet pointing at asciify.art with all your color / speed / size parameters in the URL.
Keyboard shortcuts
  • H — toggle UI (hide / show toolbar)
  • F — toggle browser fullscreen
  • Esc — exit fullscreen
Frequently asked questions
Why only A and T?
The two letters mark the two strands so the helix reads clearly at small sizes. It is a stylised motif, not a real sequence.
How is the rotation drawn?
The two strands are sine waves half a turn apart. Shifting their phase over time makes the helix appear to spin.
How do I download the DNA ASCII background?
Use the toolbar at the bottom of the fullscreen view. PNG snapshot exports the current frame as a styled image (background, color, glow). Animated HTML exports a self-contained .html file that replays the animation in any browser. TXT exports just the current ASCII frame, and Copy ASCII puts it into your clipboard.
How do I get the DNA background as a phone wallpaper?
Tap "Wallpaper" in the toolbar and pick a preset: Phone 9:19.5 (1440×3120), iPhone Pro Max (1320×2868), Tablet, Desktop 4K, Ultrawide, Square, Story 9:16, Watch or Social card. The image is rendered at that exact resolution, not upscaled from your screen. "Keep top 25 % calm" dims the area behind the clock and widgets. On a phone, "Save to Photos" opens the share sheet so you can save it straight to your gallery, and "Download video (6 s)" records a short MP4/WebM loop for live-wallpaper apps, Reels or TikTok.
Can I embed the DNA background on my own site?
Yes. Click "Copy embed" in the toolbar to get an <iframe> snippet pointing at asciify.art. Width, color, speed and font size are encoded in the URL, so it stays exactly the way you configured it.
Can I customize color and speed?
Yes. Pick one of the preset colors, use the native color picker for any RGB value, adjust speed from 0.1× to 3×, and change font size from 6px to 24px. The PNG / HTML / embed export uses the current settings.