Does decoding a JWT verify its signature?

No. JWT Decoder displays the header and payload and checks time claims such as expiration. Decoding alone does not prove who issued a token or whether it was changed. Verify the signature and expected claims in your application before trusting it.

Is Base64 a way to encrypt a secret?

No. Base64 is a reversible encoding for representing bytes as text. Use Base64 Encode / Decode for payload inspection and transport formats, including Unicode text; it does not protect a password or token from someone who can read the encoded value.

Should I format JSON or validate it first?

Use JSON Validator to locate syntax problems and inspect structure. Once the input is valid, JSON Formatter makes it easier to read, while JSON Minifier removes formatting for compact output. A syntax check does not validate your application schema or business rules.

When should I hash a file instead of generating a UUID?

Hash Calculator produces a digest from text or file contents so you can compare it with an expected digest. UUID Generator creates identifiers for fixtures or records. A UUID is not a checksum, and a matching digest does not establish the identity of a file publisher.

Developer Tools

Debug a JSON response, decode a Unicode Base64 payload, or inspect a JWT before returning to your code. Choose a formatter, converter, or code utility below.

JSON Tools

Encoding & Utilities

Base64 Encode / Decode

Encode and decode Base64 strings with full Unicode support
Open tool
Hash Calculator

Calculate SHA-1, SHA-256, SHA-384, SHA-512 hashes for text and files
Open tool
JWT Decoder

Decode JWT tokens, inspect header/payload, check expiration
Open tool
Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal
Open tool
URL Encode / Decode

Encode and decode URL components and query strings
Open tool
UUID Generator

Generate cryptographically secure v4 UUIDs
Open tool
ZIP Extractor

Open ZIP files privately in your browser. Preview text and images, unlock encrypted archives, and extract selected files without installing apps.
Open tool

Data Conversion

Writing & Code

Code Formatting & Minification

Which tool do I need?

JSON Tools

Read a compact API response → JSON Formatter.
Find a syntax error in configuration → JSON Validator.

Encoding & Utilities

Inspect an encoded Unicode payload → Base64 Encode / Decode.
Read token claims without verifying a signature → JWT Decoder.
Compare a file with an expected digest → Hash Calculator.
Create identifiers for test records → UUID Generator.

Data Conversion

Turn exported CSV rows into structured data → CSV to JSON.

Writing & Code

Try a pattern against sample text → Regex Tester.
Check the next runs of a schedule → Cron Expression Parser.

Code Formatting & Minification

Make compressed JavaScript easier to read → JS Beautifier.

What happens to pasted code and payloads?

Code, payloads, and selected files are processed on your device. The Content Security Policy allows connections back to this site only (connect-src 'self'); it does not block all network requests. Some tools load their engines from this site on first use. Let the selected tool finish loading before disconnecting, and use sample credentials when reproducing a bug.

Developer Tools

JSON Tools

CSS PX to REM Converter

JSON Formatter

JSON Minifier

JSON to CSV

JSON to YAML

JSON Tree Viewer

JSON Validator

Encoding & Utilities

Base64 Encode / Decode

Hash Calculator

JWT Decoder

Number Base Converter

URL Encode / Decode

UUID Generator

ZIP Extractor

Data Conversion

CSV to JSON

Morse Code Translator

Unix Timestamp Converter

YAML to JSON

Writing & Code

Code to Image

Cron Expression Parser

HTML to Markdown

Markdown Editor

Markdown to HTML

Px to Rem Converter

Regex Tester

Code Formatting & Minification

CSS Minifier

HTML Minifier

JS Beautifier

Which tool do I need?

JSON Tools

Encoding & Utilities

Data Conversion

Writing & Code

Code Formatting & Minification

What happens to pasted code and payloads?

Frequently Asked Questions

Does decoding a JWT verify its signature?

Is Base64 a way to encrypt a secret?

Should I format JSON or validate it first?

When should I hash a file instead of generating a UUID?