UD5 Toolkit
Cookie Store API Tester - Online Async Cookie Read/Write
Read, write, and delete cookies using the modern Cookie Store API. Monitor change events. No more document.cookie parsing.
Cookie String Parser - Online Decode & Format Browser Cookies
Cookie String Parser
Decode, format, and analyze browser cookie strings instantly. Supports URL decoding and JSON export.
Cookie String
Paste a cookie string and click Parse to see decoded data.
| # | Name | Value (decoded) | Raw Value | Size |
|---|
Frequently Asked Questions
What is a cookie string?
A cookie string is a semicolon-separated list of key-value pairs (e.g., key=value; key2=value2). It's the raw format sent in the HTTP Cookie header. Some characters are URL-encoded to ensure safe transmission.
Why are some cookie values encoded?
Browsers automatically URL-encode special characters (like @, {, }, spaces) in cookie values. Our parser decodes them into readable format using decodeURIComponent().
How accurate is the size calculation?
The Size column shows the byte length of the raw cookie name and value pair (including =), matching the actual bytes sent over the network. This helps identify large cookies that may impact performance.
Can I parse cookies from any website?
Yes! You can copy the cookie string from browser DevTools (Application tab → Cookies → select domain → copy as string) or from the document.cookie JavaScript API. Paste it here for instant analysis.
Pro tip: Use the Copy as JSON button to export the parsed data for debugging or logging. The table copy output is tab-separated for spreadsheets.
Common cookie limitations: Browsers typically allow up to 50-180 cookies per domain, each up to 4096 bytes. Use this parser to audit cookie sizes and stay within limits.
Local Password Vault - Online Encrypted Browser Storage
Store passwords and notes encrypted with a master passphrase. Data lives only in your browser's localStorage. No cloud.
Playdough Recipe Calculator – Online Adjust Batch Size
Scale a classic homemade playdough recipe to any amount. Choose colors with safe options. Simple local calculator.
Sepia to Color Restorer - Online Approximate Original
Apply a tint remover that guesses the original colors from a sepia photo. Not perfect, but fun. All in canvas.
Quick Notepad - Online Private Note Taker with Auto Save
A minimalist text notepad that auto-saves to your browser's localStorage. No ads, no signup, no data leaves your device. Perfect for quick ideas.
Clipboard API Tester - Online Read & Write Sandbox
Experiment with the Async Clipboard API: read/write text and images from the clipboard. Verify permissions and see demo code.
Tone Mapping Tool - Online Local HDR to LDR
Apply tone mapping algorithms to bring out details in highlights and shadows. Simulate HDR from a single image.
Text to Vue SFC Skeleton - Online Quick Single File Component
Enter a component name and get a basic Vue 3 Single File Component template with script setup. Fast scaffolding.
Next.js Page Boilerplate - Online App Router Setup
Generate a Next.js page.tsx file with Server Component or Client Component. Layout and metadata included.
React Custom Hook Scaffolder - Online Code Generator
Provide a hook name and select features (state, effect, callback). Get a complete React custom hook with TypeScript. Faster development.
CSS Compatibility Linter - Online Check Browser Support
Paste your CSS and see warnings for properties that have limited browser support. Links to CanIUse. Modernize safely.
User Agent Style Sheet Explorer - Online See Default CSS
Browse the built‑in styles that browsers apply to HTML elements. Understand why your page looks different. Static reference.
Browser Screen Recorder - Online Record Tab & Download WebM
Record your screen, window, or tab with audio directly in the browser. Download the recording as a WebM file. No upload.
ImageDecoder API Demo - Online Progressive Decode
Decode an image progressively using the ImageDecoder API. See partial results and metadata. Modern alternative to <img>.
IndexedDB Browser - Online View & Edit Client‑Side DB
Explore your website’s IndexedDB databases and object stores. Add, delete, and inspect records. Like phpMyAdmin for IndexedDB.
Web Bluetooth Scanner - Online Explore Nearby Devices
Scan for nearby Bluetooth Low Energy devices using the browser. Read device names and signal strength. Experimental API.
Snowflake ID Parser - Online Decode Discord/Twitter IDs
Parse a Snowflake ID (used by Discord, Twitter) into its timestamp, worker, and sequence components. Instant local decoding.
File to Base64 Encoder/Decoder - Online Download
Encode any file into a Base64 string that you can copy, or decode a Base64 string back to a downloadable file. Pure frontend.
Instant Image Slideshow - Online Local Photo Player
Select a folder of images and start a full‑screen slideshow right in your browser. Adjust interval and transition. No upload.
JWT Viewer & Verifier - Online Decode & Check Signature
Paste a JSON Web Token and decode its header and payload. Verify signature if you provide the secret. Fully local.
Text to ISO Date Converter - Online Parse Any Date String
Paste a human‑readable date (like 'next Friday' or 'March 5, 2023') and convert it to ISO 8601 format. Quick and tolerant.
Tab Counter & Memory Estimator - Online Window Stats
See how many tabs you have open and estimate memory usage based on navigator object. Fun productivity check.
Tampermonkey Script Skeleton - Online UserScript Generator
Fill in name, match URL, and description to get a ready‑to‑edit UserScript header. Start your browser extension easily.
Browser Fingerprint Viewer - Online See Your Unique ID
Generate a hash showing how trackers can fingerprint your browser (canvas, WebGL, fonts). Educational and privacy‑aware.
Browser Extension Headers Check - Online Detect Injected Scripts
Look at HTTP headers and JavaScript objects to guess which browser extensions might be installed. For awareness.
QR Code from Camera Snapshot - Online Freeze & Decode
Freeze your live camera, then scan a QR code from the static frame. Works when auto‑scan fails. Private.
Web Server Log Parser - Online Apache/Nginx Analyzer
Paste a raw server log snippet and see a structured table with IP, method, URL, and status. Quick audit.
Browser Window Info - Online Viewport & Screen Data
See exact dimensions of your current browser inner/outer window, screen resolution, and pixel ratio. Developer debug.
Data URL to File Downloader - Online Decode & Save
Paste a data: URL and instantly download the file it represents. Supports all MIME types. Simple extraction.
Braille to Text Converter - Online Decode Dot Patterns
Enter Braille dot numbers (1‑6) or paste Unicode Braille to decode into English text. Companion to text‑to‑Braille.