SuperSeaArea

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

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

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

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.

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

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

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

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

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

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

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

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

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

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