Black Screen

Online keyboard test with a full 104-key visualizer, key history, ghosting checks, and double-type detection for Windows and Mac layouts.

Free aspect ratio calculator for images, videos, social media, screens, CSS, and AI prompts. Calculate 16:9, 9:16, 4:5, 1:1 or custom ratios, and detect the ratio of an uploaded image.

Gold calculator for melt value estimates of jewelry, coins, and scrap. Live spot prices for 24K, 18K, 14K and other karats, per gram, ounce and kilogram.

Convert HEIC to JPG in your browser, free and without uploads. Batch-convert iPhone photos, choose quality, and download JPGs or a ZIP.

Create a custom Jeopardy-style board with TriviaBeam. Add clues, invite teams, and host live with phone buzzers, scoring, and a shared display.

Turn text, images and PDFs into editable diagrams. Refine them through chat, then export PNG, SVG or PDF. Create flowcharts and system architecture diagrams for visual documentation. Try one diagram free without signing up. New accounts receive 100 one-time signup credits; further AI generation uses credits. Manual editing and standard exports are free.

Mazelingo turns Japanese text into a Japanese-English mix. Pick how much English appears and how hard it is, then tap any sentence to see the original. No API key needed.

ImageSplit is a free browser-based image splitter that cuts one photo into equal numbered tiles for Instagram grids, posters and print. Choose 2x2, 3x3 or a custom grid up to 10x10, then download PNG/JPG/WebP tiles or a numbered ZIP. Images are processed locally in your browser; no signup, 100% free.

PixMelody is a unified AI image and video studio that brings every leading model — GPT Image 2, Nano Banana 2, Nano Banana Pro, and Seedream — into one workspace on a single credit balance. Bring a prompt or a reference, leave with work you'd actually ship — no juggling five subscriptions or ten browser tabs. Features include: every leading model in one workspace; one credit balance; character & product consistency across up to 5 subjects; and a studio for text-to-image, image-to-image, AI video, in-place editing, 4K upscaling, and one-click background removal. Target Audience: Pro creators, designers, and marketers — brand and product designers, indie illustrators, e-commerce founders, and content teams.

VideoUpscaler is a web-based AI tool that enhances low-resolution videos and upscales them to HD and 4K while preserving detail and smoothness. It is built for creators, marketers, and everyday users who want to restore old footage, upgrade product videos, or prepare clips for high-resolution displays without complex editing software. It runs in the browser, supports common video formats, and delivers commercial-ready output in a few clicks.

VideoUpscaler is a web-based AI tool that enhances low-resolution videos and upscales them to HD and 4K while preserving detail and smoothness. It is built for creators, marketers, and everyday users who want to restore old footage, upgrade product videos, or prepare clips for high-resolution displays without complex editing software. It runs in the browser, supports common video formats, and delivers commercial-ready output in a few clicks.

Free random topic generator for impromptu speaking practice. Get random or AI-generated speech topics in seconds (3, 5, or 10 at a time), then practice with a built-in full-screen timer that records every session. Recordings can be saved to the cloud, and AI analysis scores each speech across six dimensions with a radar chart and shareable report card. Topic generation and the timer are free and unlimited; the site is available in 8 languages and is aimed at Toastmasters members, students, and anyone preparing for table topics, debates, interviews, or public speaking practice.