A collection of developer utilities in a single desktop application

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• Updated Mar 2, 2026
• Java

Web app that can hash/hmac, encrypt/decrypt, and sign/verify the data, debug JWT tokens, parse and edit ASN1 structures, compute diffs, and more

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• Updated Jul 20, 2026
• Rust

JWT Debugger — Use JWT Debugger free on ToolAdda — quick, accurate, and browser-based. Free on ToolAdda.online.

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• Updated Sep 22, 2026

85 free browser-based developer tools — AES, SHA, JWT, Base64, JSON, Regex, Diff, QR and more. 100% client-side. No login. No tracking.

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• Updated Sep 25, 2026
• JavaScript

Plain toolbelt for developers

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• Updated Mar 19, 2022
• TypeScript

Privacy-first URL analyzer. Parse, decode & inspect URLs in the browser — JWT, timestamps, Base64, JSON. No data sent to servers.

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• Updated May 29, 2026
• TypeScript

A simple JWT decoder extension for VS Code

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• Updated Mar 25, 2026
• TypeScript

Web application to track and analyze workout data.

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• Updated Oct 20, 2026
• TypeScript

Free, open-source developer utilities that run entirely in your browser. 700+ tools across 34 categories.

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• Updated Apr 18, 2026
• TypeScript

A self-hosted, privacy-first developer toolkit. JSON formatter, diff checker, Base64 codec, code beautifier, regex tester, URL codec, JWT decoder, and color converter. All running 100% client-side. No tracking, no cookies, no server calls, no logging

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• Updated Aug 24, 2026
• TypeScript

9-in-1 browser-based developer toolkit. Single HTML file. No dependencies.

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• Updated May 13, 2026
• HTML

Decode JWTs, verify signatures, and decrypt JWEs with clear, syntax-highlighted output. Everything runs locally, so your tokens never leave your machine.

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• Updated Sep 9, 2026
• Go

Developer-focused cookie manager for security learning and backend testing.

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• Updated Apr 8, 2026
• JavaScript

Native macOS developer toolbox. Paste anything, get it formatted, decoded or converted. Fully local, no telemetry.

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• Updated Oct 28, 2026
• Swift

BLACKSURFACE is an offensive security reconnaissance and attack-surface mapping platform designed for bug bounty hunters, red teamers, and Penetration Testers. It centralizes reconnaissance workflows, tools, and intelligence into a single, high-impact command interface.

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• Updated Jan 22, 2026
• HTML

Free browser-based developer tools — JSON formatter, JWT decoder, regex tester, UUID generator, and more. No signup, no tracking, no server.

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• Updated Jun 22, 2026
• TypeScript

A fast Notepad replacement for Windows. Detects what you paste (JSON, JWT, Base64) and transforms it in place. Auto-saves everything, no telemetry, fully offline. .NET 10 + WPF.

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• Updated Sep 29, 2026
• C#

Browser-based developer toolbox: JSON formatter, Base64, URL, JWT decoder, and timestamp converter. No install, nothing uploaded.

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• Updated Nov 10, 2026
• JavaScript

JSON Web Tokens decoder

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• Updated Dec 31, 2024
• TypeScript

Decode and verify JWTs fully offline — one HTML file, CSP-provable no network

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• Updated Jul 5, 2026
• HTML