Encoding · File Encode/Decode
Base64 File Encoder: Encode Files in Your Browser
File Encode/Decode how to for base64 file encoder: open the tool, run a tiny sample, then save the result.
Jun 28, 2026
Guides & articles
These are the reviewed how-to guides for our core tools (for example /blog/api-tester). Each guide opens the matching utility at /tools/api-tester. Additional tools remain available from the tools hub.
Color · Contrast Checker
Contrast Checker: WCAG AA and AAA Ratio Tester
Contrast Checker how to for contrast checker: open the tool, run a tiny sample, then save the result.
Jun 28, 2026
Formatting · JSON Formatter
JSON Formatter: Pretty Print, Minify and Validate
JSON Formatter how to for json formatter: open the tool, run a tiny sample, then save the result.
Jun 28, 2026
Formatting · JSON Validator
JSON Validator: Find Syntax Errors and Pretty Print
JSON Validator how to for json validator: open the tool, run a tiny sample, then save the result.
Jun 28, 2026
Encoding · JWT Decoder
JWT Decoder: Inspect Header, Payload and Expiry
JWT Decoder how to for jwt decoder: open the tool, run a tiny sample, then save the result.
Jun 27, 2026
Security · Password Generator
Password Generator: Strong Passwords with Breach Check
Password Generator how to for password generator: open the tool, run a tiny sample, then save the result.
Jun 27, 2026
Formatting · Regex Tester
Regex Tester: Test Patterns with Live Match Groups
Regex Tester how to for regex tester: open the tool, run a tiny sample, then save the result.
Jun 27, 2026
Network · API Tester
API Tester: Postman Style REST Client in the Browser
API Tester how to for api tester: open the tool, run a tiny sample, then save the result.
Jun 20, 2026
Guides are tied to working tools on DevsWallet. Read our editorial policy or send corrections through the contact page.