Fast, lightweight browser powered by Klat Engine - not Chromium, Gecko, or WebKit. Significantly more RAM-friendly with extensive features including vertical tabs, built-in adblock, vertical tabs, split view, sidebar apps, reader mode, and more. Free and open source.
Klat Engine uses ~70% less RAM than Chromium-based browsers. Runs smoothly on 2GB RAM devices. Perfect for older hardware and low-spec devices.
Vertical tab sidebar for better tab management. Split view lets you view two pages side-by-side. Perfect for research, coding, and multitasking.
Built-in sidebar with AI assistant, calculator, notes, translator, calendar, and more. Add custom web apps. Access tools without leaving your current page.
One-click reader mode strips ads, sidebars, and clutter. Customizable fonts, themes, text-to-speech, and auto-scroll for comfortable reading.
uBlock Origin compatible ad/tracker blocking built-in. No extensions needed. Fingerprinting protection, cookie auto-delete, HTTPS-first, and strict privacy controls.
Full WebExtensions API support. Install extensions from Chrome Web Store. Compatible with uBlock Origin, Bitwarden, Dark Reader, Vimium, and thousands more.
Customizable mouse gestures for navigation, tabs, and actions. Vimium-style keyboard shortcuts. Fully customizable keybindings for power users.
Built-in offline translation for 100+ languages. No cloud required - translations happen locally. Select text or translate entire pages instantly.
Float any video in Picture-in-Picture mode. Global media controls in toolbar. Background audio playback. Video speed controller and screenshot tool.
Multi-threaded download accelerator built-in. Pause/resume, scheduled downloads, video detection, clipboard monitoring, and malware scanning integration.
Complete UI theming - colors, spacing, density, animations. Custom CSS support. Toolbar customization. Density modes: compact, normal, touch-friendly.
End-to-end encrypted sync across devices. Sync tabs, bookmarks, history, passwords, settings, and extensions. Self-hosted sync server option for privacy.
Runs smoothly on 2GB RAM, old CPUs, and limited storage. Perfect for reviving old laptops and budget devices.
Vertical tabs, split view, sidebar apps, mouse gestures, and keyboard shortcuts for maximum productivity.
No telemetry, no tracking, built-in adblock, fingerprinting protection, and self-hosted sync option. Your data stays yours.
Reader mode, text-to-speech, offline translation, split view for comparing sources, and distraction-free reading.
DevTools compatible with Chrome DevTools protocol. Vertical tabs for docs + code. Sidebar for API docs, regex tester, color picker.
Fully portable version runs from USB drive. No installation needed. Carry your browser, bookmarks, and extensions anywhere.
v1.0.0 • 145 MB
v1.0.0 • 138 MB
Yes! Klat Browser uses Klat Engine - a completely custom browser engine written from scratch in Rust and C++. It has its own HTML parser (KlatHTML), CSS engine (KlatStyle), JavaScript engine (KlatJS), layout engine (KlatLayout), and networking stack (KlatNet). Zero Chromium/Gecko/WebKit code.
Most likely yes. Klat Browser supports the WebExtensions API (Manifest V2 and V3) with ~95% Chrome compatibility. Popular extensions like uBlock Origin, Bitwarden, Dark Reader, Vimium, LanguageTool, and thousands more work out of the box. Install directly from Chrome Web Store.
Klat Engine was designed from day one for memory efficiency: single-process-per-site (not per-tab), shared string interning, compact AST representation, aggressive dead code elimination, lazy parsing, tab hibernation, and a custom allocator (KlatAlloc) optimized for browser workloads. No V8/SpiderMonkey overhead.
Yes. Klat Engine implements modern security: site isolation, process sandboxing (seccomp on Linux, AppContainer on Windows, Seatbelt on macOS), HSTS, certificate transparency, same-site cookies, and regular security audits. It passes all major web platform tests. However, as a younger engine, it may have undiscovered edge cases - use judgment for high-stakes activities.
Yes! Klat Engine supports Widevine CDM (via official component), Media Source Extensions, Encrypted Media Extensions, and all modern streaming standards. Netflix, YouTube, Disney+, Spotify, Prime Video, and all major streaming services work out of the box. DRM can be disabled in settings if preferred.
Yes! Built-in end-to-end encrypted sync for bookmarks, history, passwords, tabs, settings, and extensions. You can use our official sync server (zero-knowledge, we can't read your data) or self-host the Klat Sync Server for complete control. Sync is optional and disabled by default.
Compatibility is excellent for modern sites. Klat Engine passes >95% of Web Platform Tests. Some very old sites relying on non-standard IE/legacy behaviors may render differently. We maintain a compatibility list and site-specific quirks mode for known issues. Report broken sites on GitHub - we fix them fast.
Not yet. Klat Engine is currently desktop-only (Windows, Linux, macOS). Mobile ports are planned for 2026 - the engine architecture supports it, but native UI work is needed for Android/iOS. For now, use the desktop version with remote debugging for mobile development.
GitHub Issues: github.com/klatasia/klat-browser/issues. We're very responsive - most bugs get triaged within 24h. Feature requests go through discussions first. Join our Discord/Matrix for real-time chat. Security issues: security@klat.asia (PGP key on website).
MPL-2.0 (Mozilla Public License 2.0) - file-level copyleft. You can use, modify, distribute commercially. If you modify engine source files, you must share those changes. UI/application code can be proprietary. Embedding Klat Engine in your app is allowed. Very business-friendly license.