Everyday Utility Tools, Zero Telemetry.
High-performance calculators, unit converters, and media optimizers running directly and privately inside your browser memory.
JSON/YAML/CSV Converter
Convert between JSON, YAML, and CSV formats with syntax validation and pretty formatting.
API Request Builder
Compose HTTP requests and export them as cURL, fetch, raw HTTP, or Python.
UUID Generator
Generate UUID v1 (timestamp-based) and v4 (random) with bulk generation support.
JWT Encoder & Decoder
Encode, decode, inspect and verify JSON Web Tokens (JWT).
Royalty Calculator
Calculates earnings for ebook, paperback, and hardcover across KDP, IngramSpark, and other platforms.
Copyright Page Generator
Builds a properly structured copyright page with ISBN, credits, and legal notices.
Book Outline Generator
Creates chapter-by-chapter book outlines based on genre, premise, and structure.
Character Name Generator
Generates character names suited to genre, culture, and story tone.
KDP Category Finder
Recommends Amazon KDP categories and BISAC codes with competition insights.
Readability Checker
Check readability scores, Flesch grade levels, and sentence difficulty in real time.
Amazon KDP Keyword Research Tool
Find real Amazon shopper search keywords, analyze competition, and optimize all 7 Kindle Direct Publishing (KDP) metadata slots up to 50 characters.
Online EPUB Reader
Read EPUB eBooks directly in your browser with custom typography, day/sepia/dark themes, interactive table of contents, and automatic reading position saving.
About ToolSlash Engine
ToolSlash is a high-performance utility platform engineered for speed, privacy, and efficiency. Our core engine powers a wide array of everyday tools - from quick converters to sophisticated text and media processors. By running complex algorithms directly in your browser, we eliminate server round-trips to deliver a seamless, lightning-fast experience.
Frequently Asked Questions
- Are the utilities free?
- Yes, all utility tools on the ToolSlash platform are 100% free to use. There are no premium tiers, hidden fees, or paywalls.
- How is data processed?
- We strongly prioritize client-side processing. Most of our tools execute entirely within your browser memory for maximum speed and zero data exposure.
- Is my data saved?
- While some computationally heavy tools may require our backend engine, your files and data are never saved, stored, or analyzed by us.