Developer Tools
Base64 Encoding Without the Cloud: What Your Browser Handles Locally
How Base64 encoding works at the byte level, why client-side browser encoding eliminates data exposure, and practical workflows for sensitive data.
Developer Tools
Guides for developers who keep their work local, covering the small jobs the browser tools on this site handle in seconds without anything leaving your machine.
Developer Tools
Debugging 500 MB+ Application Logs in the Browser Without Uploading
Filter and search gigabyte-scale log files locally in your browser with Web Workers and IndexedDB, zero uploads, no server, no PII exposure on the wire.
Developer Tools
Counting Prompt Tokens Locally Before Sending to GPT, Claude, and Gemini
Count tokens, context usage, and input costs for 35+ AI models entirely in your browser before any prompt reaches an API. Prices updated daily, works offline.
Developer Tools
Testing WebRTC Peer-to-Peer Connection Quality Without Cloud Relay Servers
Measure direct browser latency, jitter, and packet loss with zero-cloud WebRTC tools. No servers, no uploads, no TURN relay.
Developer Tools
Debugging and Exploring Parquet Files with Local SQL Queries
Query and debug Parquet files locally with SQL, inspect schemas, validate data, catch errors before they reach production.
Developer Tools
Client-Side Cron Expression Parsing for Developer Workflow Automation
Learn to validate cron expressions locally with CapyToolkit's parser, avoiding sensitive schedule exposure and catching errors before deployment.
Developer Tools
Converting Color Spaces for CSS and Design Workflows
Understand HEX, RGB, HSL, HSV, OKLCH and when to use each format in production CSS. Includes client-side workflow tips using CapyToolkit's converter.
Developer Tools
Deep JWT Inspection Without Transmission: Client-Side Token Analysis with CapyToolkit
Inspect JWT tokens locally: no upload, no network, full privacy. Decode headers, claims, and expiry in-browser for debugging, development, and documentation.