Developer Tools

9 tools · Free · No login · Runs in your browser

Tools developers reach for constantly: checking API JSON responses, decoding tokens, generating hashes and UUIDs, and converting timestamps. Everything runs in your browser, so tokens and data never leave your machine.

All Developer Tools

JSON Processor

Validate, format, minify JSON with error location highlighting

Hash Generator

Generate MD5, SHA1, SHA256, SHA512 hashes and verify file integrity

EXIF Metadata Viewer

View photo and AI-generated image metadata and remove it for privacy protection

Unix Timestamp Converter

Convert Unix timestamps to dates and dates to timestamps

UUID/GUID Generator

Generate unique identifiers (v1, v4) in bulk without duplication

URL Encoder/Decoder

Encode or decode special characters in URLs to %EB%... format

JSON-CSV Converter

Convert JSON data to Excel-compatible CSV, or CSV to JSON, safely in your browser

JWT Decoder

Decode JWT (JSON Web Token) into Header, Payload, and Signature to instantly inspect the contents

HTML/CSS/JS Viewer

Live code editor to write HTML, CSS, JavaScript and see results instantly

Frequently Asked Questions

Is it safe to paste a real token into the JWT decoder?
Decoding happens only in your browser and the token is never sent to a server. Keep in mind that a JWT payload is encoded, not encrypted, so avoid exposing production tokens on shared screens.
Can I use MD5 or SHA256 to store passwords?
Not recommended. MD5 and the SHA family are fast to compute, which makes them weak against brute-force attacks. Use deliberately slow algorithms such as bcrypt, scrypt, or Argon2 for passwords, and use the hash generator for checking file integrity.
What's the difference between UUID v1 and v4?
v1 is built from the creation time and device information, so it sorts by time but can reveal when and where it was created. v4 is random and hard to guess, which makes it the most common choice for general identifiers.

Related Guides

Free Developer Tools - JSON Formatter, JWT Decoder, Hash & UUID Generator, URL Encoder | DDTool