SuperSeaArea

Take quick text notes that persist locally in your browser. Search, edit, delete — no accounts, no sync.

Open multiple URLs in one click, grouped for easy management. Ideal for developers, researchers, and productivity enthusiasts.

Simple calculator with scientific mode and calculation history. Supports keyboard input.

Convert text between UPPERCASE, Title Case, camelCase, snake_case, kebab-case and more. Live preview, copy, fully local.

Countdown timer and stopwatch with laps. Quick presets, big digits, and an optional beep when time is up. Fully offline.

Generate strong, cryptographically random passwords entirely on your device. No accounts, no servers, never logged.

Compute the WCAG contrast ratio between two colors and see which AA / AAA bars you pass. Fully local.

Compute SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text. Fully local via the browser's WebCrypto. No data leaves your device.

Generate Lorem Ipsum placeholder text — words, sentences, or paragraphs. Instant, fully local.

A simple, fast, and customizable QR code generator with color and logo support.

Track live time across cities worldwide. Day/night view, UTC offsets, 12/24h toggle, and a meeting planner. No network.

Encode and decode text between plain, Base64, URL-encoding and Hex. Live, fully local, handles UTF-8 correctly.

A live Markdown editor with rendered HTML preview. GitHub-flavoured, runs fully in your browser, no network.

Convert images between PNG, WebP and JPEG and optionally resize them — fully in your browser, no uploads.

Build and read cron schedules. Live plain-English explanation, the next 5 run times, field presets, and one-click copy.

Convert integers between binary, octal, decimal, hex and any base 2-36. Bitwise AND/OR/XOR/shift tools. Fully offline.

Format, minify and validate JSON locally with precise line+column errors. No data leaves your device.

Compare two texts line by line. Added and removed lines are clearly marked; counts shown at a glance. Fully local.

Convert Unix timestamps to local, UTC, ISO 8601 and relative time, and back. Live epoch clock, one-click copy.

Decode a JWT's header and payload locally. Signature is NOT verified — never paste production tokens. Stays on your device.