Ultrawider — Fill Ultrawide Monitors with 21:9 Video Warp

Stretch 16:9 videos to fit any 21:9, 32:9, or other ultrawide monitor. Smart WebGL warp keeps faces round. Free on YouTube.

You bought an ultrawide monitor. Almost every video on the web is still 16:9 — sitting in the middle of your screen with thick black bars eating ~26% of your real estate. Ultrawider fixes that. It stretches any 16:9 video to fill your 21:9, 32:9, or any other ultrawide monitor — without distorting the faces in the center. HOW IT WORKS Most "stretch to fit" tools do uniform scaling: people get fat, everyone looks like they're in a fun-house mirror. Ultrawider uses a quintic non-linear warp (NLS) shader: the center 60% of the frame stays geometrically correct, and only the outer 20% on each side gets stretched to fill the extra width. Faces stay round. Sports replays look natural. Movie close-ups stay cinematic. When pixel access isn't available (cross-origin embedded players or sites that block pixel reads for content protection), Ultrawider automatically falls back to Crop mode — a uniform CSS scale that fills the screen the same way "object-fit: cover" does, sacrificing top/bottom edges instead of pillarboxing. The result: your ultrawide monitor finally pays for itself. FEATURES • Smoothie mode — quintic NLS WebGL2 shader. The math that keeps faces round while edges stretch. Tunable concavity slider so you can dial it from "subtle" to "strong" per site. • Crop mode — CSS-only fallback that works on every video. No pixel reads required, so it works even in cross-origin embedded players. • Auto-detect — picks the best available mode the moment you enter fullscreen. Per-host preferences remembered. • Aspect-aware — detects your monitor's actual aspect ratio (21:9, 32:9, 21:10, 32:10, dual-stacked — anything you've got) and computes the right stretch for your geometry. No setup, no manual configuration. • Universal video detection — works on YouTube and any other site with an HTML5 video player or embedded iframe player. No site-by-site whitelist; new video sites work automatically without extension updates. • Zero distortion when off — toggle Off and the video returns to its original aspect, no residual artifacts. PRICING • Free — Smoothie + Crop on YouTube, forever. No signup, no key. • Pro — unlocks every other video site for $2.98/month. • One-time payments via Telegram Stars (paid by card). No auto-renewal. Renew when you want, don't when you don't. • One Pro key activates on up to 3 devices simultaneously. The least-recently-used device unbinds when you go over. • 30-day goodwill refunds — email us and we'll process within 24 hours. PRIVACY • We collect: anonymous install ID, anonymous error reports, anonymous usage events (active mode, hostname-only). Telemetry can be turned off in the popup at any time. • We do NOT collect: page URLs (only hostname), page content, video content, your identity, your watch history. • License keys are passed via URL fragment (#key=...) not query parameters — so they never appear in server logs, Referer headers, or browser sync. • Full policy at https://ultrawider.net/privacy COMPATIBILITY • Chrome / Edge / Brave / Vivaldi (Chromium 119+) • Every ultrawide aspect ratio: 21:9 (3440×1440), 32:9 (5120×1440), 21:10, 32:10, portrait-stacked configurations — works on any ultrawide. • Works in browser fullscreen, presentation fullscreen, and detected automatically when a player goes fullscreen. FAQ Will faces look distorted? Smoothie's whole purpose is to keep the center undistorted. The central 60% of the frame is geometrically identical to the source; only the outer 20% on each side gets stretched. Movie close-ups, news anchors, sports broadcasters all look natural. Does it work in browser fullscreen (F11)? Yes — Ultrawider detects both Fullscreen API requests (the player's fullscreen button) and document-level fullscreen. Why is Smoothie unavailable on this site? Either the video is embedded in a cross-origin iframe Ultrawider can't read pixels from, or the site protects its content by blocking pixel access. Crop works either way and is always available — click it instead. Can I use it on more than 3 devices? The 3-device cap auto-rotates: the least-recently-used device unbinds when you activate on a 4th. Need a higher cap? Email hello@ultrawider.net. Is my watch history collected? No. We never log URLs or page content — only the bare hostname (e.g. "youtube.com") is sent with telemetry, and telemetry itself can be toggled off in the popup. Get your ultrawide monitor working the way you expected when you bought it.