JSON Formatter
json
Format, validate, and minify JSON locally in your browser.
Browser utilities that stay on your device
Fast, private, browser-based utilities. No account. No uploads required for local tools.
Instant local search. Press Ctrl/Cmd+K for the command palette.
Editor’s picks
Curated utilities worth opening first—deterministic picks, not fake trending.
JWT Decoder
security
Inspect JWT header and payload locally—no signature verify.
Image Compressor
image
Compress images locally with quality and size controls.
PDF Merger
Merge PDFs locally with full order control.
UUID Generator
random
Generate UUID v4 and v7 IDs locally with bulk output.
Regex Tester
developer
Test regex patterns with flags, highlights, and safe timeout protection.
Recently added
Newest tools from the registry, sorted by created date.
AES Encrypt/Decrypt
crypto
Password-based AES-256-GCM demo via Web Crypto.
Age Calculator
math
Age in years, months, and days between two dates.
Area Unit Converter
converter
Convert area units like acres, hectares, and m².
ASCII Code Converter
converter
Convert text to character codes and back.
Aspect Ratio Calculator
math
Simplify a ratio and scale to a target dimension.
Base64 Encode/Decode
developer
Unicode-safe Base64 encode/decode for text and files locally.
Binary Text Converter
converter
Convert text to binary and binary to text.
BMI Calculator
math
BMI and weight category in metric or imperial.
Recently updated
Tools with the latest editorial or feature updates.
AES Encrypt/Decrypt
crypto
Password-based AES-256-GCM demo via Web Crypto.
Age Calculator
math
Age in years, months, and days between two dates.
Area Unit Converter
converter
Convert area units like acres, hectares, and m².
ASCII Code Converter
converter
Convert text to character codes and back.
Aspect Ratio Calculator
math
Simplify a ratio and scale to a target dimension.
Base64 Encode/Decode
developer
Unicode-safe Base64 encode/decode for text and files locally.
Binary Text Converter
converter
Convert text to binary and binary to text.
BMI Calculator
math
BMI and weight category in metric or imperial.
Categories
Browse utilities by intent—developer, JSON, image, PDF, and more.
Collections
Curated toolkits generated from allowlisted collection metadata.
JSON Toolkit
FeaturedFormat, validate, minify, and convert JSON locally—ideal for API debugging and config work. Browse this curated wowTools collection of local browser utilities.
5 tools
Developer Essentials
FeaturedEncoding, hashing, regex, UUIDs, JWT inspection, and other daily browser utilities for engineers. Browse this curated wowTools collection of local browser
10 tools
Security Helpers
Inspect JWTs, generate hashes and passwords, and encode payloads locally before they leave your machine. Browse this curated wowTools collection of local
9 tools
Learn
Short guides that answer one question, then link you into the right tools.
- How to use AES Encrypt/DecryptPassword-based AES-256-GCM demo via Web Crypto. A practical guide to AES Encrypt/Decrypt: when it fits, how to get a reliable result, and the mistakes worth avoiding.
- Age Calculator: a practical guideAge in years, months, and days between two dates. A practical guide to Age Calculator: when it fits, how to get a reliable result, and the mistakes worth avoiding.
- Working with Area Unit ConverterConvert area units like acres, hectares, and m². A practical guide to Area Unit Converter: when it fits, how to get a reliable result, and the mistakes worth avoiding.
- Getting started with ASCII Code ConverterConvert text to character codes and back. A practical guide to ASCII Code Converter: when it fits, how to get a reliable result, and the mistakes worth avoiding.
Why wowTools
Private by default, fast by design, and built to scale without accounts or mandatory uploads.
Runs in your browser
Processing stays on your device whenever possible.
No account required
Open a tool and use it—favorites stay local.
Built for search
Every page is designed around a real user intent.
FAQ
Short answers about privacy, accounts, and how tools work.
- Do you upload my files?
- Tools are designed to run locally. If a tool needs a network call, it will say so clearly.
- Do I need an account?
- No. Accounts are not required.
- Are ads or analytics on?
- Ads and analytics load only when those features are enabled for this build. Tool inputs stay local either way.