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Evaluate arithmetic expressions instantly in your browser.

Estimate investment growth with monthly contributions, variance bands, and year-by-year charts.

Pick a color and convert HEX, RGB, and HSL values.

Edit images, draw, add text and shapes, and export locally.

Draw and edit images with JS Paint.

Generate strong passwords locally with customizable rules.

Decode three-part JWTs, inspect claims, and build token segments from header/payload JSON.

Generate MD5 and SHA-256 checksums for text or files locally.

Encrypt or decrypt files locally with a passphrase using PBKDF2 + AES-GCM.

Find the greatest common divisor and least common multiple.

Switch text between upper, lower, title, and sentence case.

Write formatted text, save files, and recover drafts with version history.

Transcribe audio with Whisper in your browser.

Sort multi-line text in ascending or descending alphabetical order.

Format and validate structured data locally, with instant error feedback.

Encode plain text to Base64 or decode Base64 back to text.

Test regex patterns with flags and live match results.

Compare two texts or files side by side and highlight changes.

Get ISO week number, week year, and week start/end dates.

Compare times across locations and plan meeting windows.

Run Python locally in your browser with Pyodide.

Generate QR codes with advanced styling, color controls, and optional logo overlays.

Record audio locally, monitor levels, and download clips.

Verify microphone input with live level and waveform.

Play test sounds on both sides, left, or right to check speaker output.

Run quick checks for ping, jitter, download, and upload.

Preview your webcam and inspect resolution and frame rate.

Convert video container and codecs locally with FFmpeg WASM.

Draw a handwritten signature mark and place it onto a PDF.

Guide the snake, eat food, and avoid collisions.

Slide and merge matching tiles to reach 2048.

Find every safe square in a classic game of Minesweeper.

Play classic Sudoku with pencil notes and a puzzle-book board.

Play classic Klondike Solitaire.