WebAssembly

photobaer — Edits layered images in the browser with Photoshop-style tools and opens and saves PSD files, all processed locally.

Fizzdoc — Processes documents such as PDFs and images entirely in the browser, so files never leave the device.

Hussain Compiler — Runs Python code in the browser via WebAssembly, with an editor and interactive terminal supporting input().

ClientPDF — Merges, splits, compresses, signs, OCRs and redacts PDFs entirely in the browser without uploading files to a server.

arm64js — Emulates an ARMv8-A machine in a browser tab so real Linux, shells and TUI apps run without installation.

quadmath — Estimates flight time, thrust-to-weight and all-up weight for tiny FPV whoop drones and analyzes Betaflight blackbox logs in the browser.

Whistle Image — Converts images in bulk between JPEG, PNG, WebP and AVIF entirely in the browser, including zipped folders.

repath — Simulates analog and digital circuits together in a browser-based schematic editor and shows voltages and currents on wires.

Krate — Packages desktop apps as single portable .krate files that run on Mac, Windows and Linux using a shared installed runtime.

SabioChess — Imports Chess.com and Lichess games into a browser-based board that runs Stockfish locally to classify each move and show evaluation.

BlindFlag — Privately compares two people's dealbreaker lists using client-side private set intersection, revealing a mismatched topic only when both consent.

Snaply — Runs image tools like background removal, metadata viewing and stripping, redaction, and compression entirely in the browser without uploading files.

ToolsWallet — Provides a collection of browser-based file and developer utilities that process files client-side without uploading them.

Verity — Checks images and videos for provenance, prior sightings, fact-check matches and metadata anomalies, and reports the evidence with a verified, unverified or suspicious verdict.

pythonmastery.io — Runs Python 3.13 in the browser via WebAssembly with no account, server execution, or setup, and includes lessons and quizzes.

mote — Edits text files in a minimal editor with syntax highlighting, multiple documents, and undo/redo across many platforms.

WebAssembly Memory Scanner — Scans, filters and edits values in the memory of WebAssembly modules running in the browser, in a Cheat Engine style workflow.