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Fast Text Format

Fast Text Format Tools

The ultimate collection of lightning-fast utilities to format, convert, and streamline your workflow.

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Code & Formatting

Base64 to File Decoder

Decode Base64 strings or Data URIs back into downloadable files (images, PDFs, documents, audio) with instant live preview.

Code Beautifier & Minifier

Beautify, validate, and minify your JSON, JavaScript, CSS, and HTML code into clean, readable syntax.

Config Converter (TOML / INI / .env / JSON)

Convert configuration files seamlessly between TOML, INI, Java .properties, .env, YAML, and JSON formats with nested key flattening and unflattening.

CSS Formatter & Minifier

Format, beautify, validate, and minify CSS code with custom indentation.

CSS Visual Generators

Visually generate and export CSS code for Box Shadows, Gradients, Flexbox, and Grid layouts.

CSV to JSON/SQL

Convert CSV data to JSON arrays or SQL INSERT statements.

cURL to Fetch

Easily convert cURL commands into JavaScript Fetch API code.

Docker Run to Compose

Convert docker run CLI commands into clean, production-ready docker-compose.yml configuration files.

GraphQL Explorer & Formatter

Beautify, minify, validate, and inspect GraphQL queries, mutations, subscriptions, and SDL schemas with AST operation & variable analysis.

HTML & XML Formatter

Beautify, format, and minify HTML and XML code with customizable indentation and syntax cleanup.

HTML to JSX

Client-side tool to transform HTML tags/attributes into React-compatible JSX.

HTML to Tailwind CSS

Convert standard inline styles and CSS declarations into Tailwind CSS utility classes with live preview.

JS Obfuscator

Transform readable JavaScript code into unreadable, minified code to protect logic.

JSON Stringify & Parse (.env Ready)

One-click minify and stringify multi-line JSON objects into escaped strings ready for .env files, CLI args, or code literals, or parse escaped strings back into formatted JSON.

JSON to Code

Convert JSON objects into typed models for various languages.

JSON Tree Viewer

Visually inspect, expand, collapse, search, and filter complex JSON payloads with path inspection.

JSONPath & JQ Evaluator

Query, filter, extract, and transform JSON payloads in real-time using standard JSONPath (RFC 9535) or JQ-style expressions with table and visual path views.

Markdown Editor & Previewer

Write, edit, and preview Markdown in real-time with live HTML preview, syntax styling, and HTML export.

Semantic JSON Diff

Compare two JSON documents semantically, ignoring key ordering, formatting, and whitespace differences, with visual change highlighting and RFC 6902 JSON Patch export.

Source Map Viewer

Client-side tool to upload a .map file and de-minify stack traces.

SQL Formatter

Format, beautify, and minify SQL queries across multiple SQL dialects.

String Escape & Unescape

Safely escape (and unescape) quotes, backslashes, and newlines for use in JSON strings, SQL queries, HTML, and Java/C#.

SVG Optimizer

Minify and clean raw SVG code.

SVG to PNG/WEBP

Client-side tool utilizing an HTML canvas to rasterize SVG code or files into downloadable images.

XML Utilities

Format and minify XML strings.

YAML <-> JSON

Instantly convert between YAML and JSON.

Data & Crypto

Generators & Utilities

ASCII Art Generator

Convert text into stylish ASCII art banners, figlet typography, and decorative monospace text.

Barcode Generator

Client-side tool using a canvas to generate linear barcodes (UPC, EAN, Code39) from text.

CHMOD Permissions Calculator

Calculate, convert, and inspect Linux file permissions with visual octal and symbolic modes.

Color Contrast

Check WCAG color contrast accessibility.

Color Converter & Picker

Pick colors and convert between HEX, RGB, HSL, HSV, and CMYK formats with live preview and palette tools.

Cron Expression Builder & Decoder

Build, edit, and decode cron schedules into human-readable descriptions with upcoming execution dates.

EXIF Data Viewer & Stripper

View, inspect, and strip EXIF, camera, and GPS location metadata from JPEG, PNG, and WebP images locally for complete privacy.

Favicon Generator

Convert standard images into universally compatible .ico files and generate standard web app icon sizes.

Image Base64

Convert image files into Base64 Data URI strings and CSS background-image properties.

Image Color Palette Extractor

Drop any image to extract its dominant HEX, RGB, and HSL color palette client-side, with interactive image eyedropper and one-click CSS variables, Tailwind, and JSON export.

Image Compressor

Compress and optimize JPEG, PNG, WEBP, and AVIF images locally in your browser.

Lorem Ipsum Generator

Generate customized dummy placeholder text by paragraphs, sentences, or words for mockups and designs.

Markdown Table Generator

A visual grid editor that allows users to easily add rows/columns and instantly outputs perfectly formatted Markdown table syntax.

Meta Tag & Open Graph Generator

Generate and visually preview SEO meta tags, Twitter Cards, and Facebook Open Graph tags.

Mock Data Generator

Generate hundreds of rows of fake test data (names, emails, addresses, dates, credit cards) and export it as CSV, JSON, or SQL INSERT statements for database testing.

Password Generator

Create strong, secure passwords and passphrases using customizable cryptographic algorithms.

PDF Toolkit

Merge, split, extract, rotate, and reorder PDF pages 100% locally in your browser.

QR Code Generator

Create scalable, customizable, and scannable QR codes from text or URLs with instant download.

Regex Tester & Builder

Test regular expressions with real-time match & capture group highlighting, syntax explanation breakdown, and multi-string test modes.

Robots.txt Generator

Build valid robots.txt rules, crawler directives, and block AI scrapers.

UUID / GUID Generator

Instantly generate universally unique identifiers (UUID/GUID v1, v4, v7) in bulk with custom formatting.

XML Sitemap Generator

Construct valid XML sitemaps with custom URLs, change frequencies, and priorities for search engines.

Finance & Units

Networking

JWT Debugger, Decoder & Signer

Decode, verify, debug, and sign JSON Web Tokens (JWT) with HMAC secret keys 100% locally.

Decoded Payload & Header

Generate / Sign JWT

How to Use

Paste an encoded JSON Web Token (JWT) string to decode and inspect its Header, Payload, and Signature in real time. Enter a Secret Key to verify HMAC signatures client-side, with live key strength indicators (RFC 7518 recommends ≥ 256 bits for HS256) and optional Base64 decoding. You can also generate and sign new HMAC tokens directly from custom JSON payloads completely client-side without sending secrets to any remote server.

Frequently Asked Questions

What is a JSON Web Token (JWT)?

A JSON Web Token (RFC 7519) is a compact, URL-safe container format for securely transmitting claims between parties as a signed JSON object, widely used for stateless authentication and authorization.

What are the three components of a JWT?

Header (token type and cryptographic signing algorithm), Payload (the claims or user attributes), and Signature (cryptographic verification string), separated by periods (header.payload.signature).

What is the difference between Base64 and Base64URL encoding?

Base64URL encoding replaces '+' with '-', '/' with '_', and strips trailing '=' padding characters, ensuring tokens can be transmitted in URLs and HTTP headers without escaping.

What are common registered claims in a JWT payload?

Standard claims include iss (issuer), sub (subject/user ID), aud (audience), exp (expiration timestamp), nbf (not before timestamp), iat (issued at timestamp), and jti (unique token ID).

Does decoding a JWT verify that it is authentic?

No! Decoding simply unpacks the plaintext JSON payload. To verify that a token has not been forged or tampered with, you must cryptographically verify its signature using the secret key or public certificate.

What is the difference between symmetric (HS256) and asymmetric (RS256) signing?

HS256 uses a single shared secret key for both signing and verification. RS256 uses a private key to sign and a public key to verify, allowing microservices to verify tokens without knowing the private key.

What is the 'none' algorithm security vulnerability?

A critical flaw in insecure JWT libraries where an attacker modifies the header to 'alg': 'none' and removes the signature, tricking the server into trusting unsigned, forged claims.

Where should JWT tokens be stored in web applications?

In secure, HttpOnly, SameSite cookies to protect against Cross-Site Scripting (XSS) theft. Storing sensitive JWTs in browser localStorage exposes them to malicious scripts.

Why are short expiration times paired with Refresh Tokens?

Stateless access tokens cannot be revoked easily before expiration. Short lifetimes (e.g., 15 minutes) minimize breach impact, while long-lived refresh tokens allow seamless renewal.

Does this tool transmit your JWT to external servers?

No. Decoding and claim inspection are executed strictly within your browser's local memory, keeping your authentication tokens and user details private.

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