UD5 Toolkit
Advanced Set‑Cookie String Parser - Online Decode Flags
Paste a `Set‑Cookie` header and see all attributes parsed: domain, path, Max‑Age, SameSite, Secure, HttpOnly. Debug cookies easily.
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.
Cookie String Parser & Editor – Read document.cookie
Parse a raw cookie string into a readable table. Edit values or create new cookies, then get the properly formatted string to set via JavaScript.
Unicode Escape Sequence Decoder - Online Convert \u0041 to A
Paste text with \uXXXX or \xXX escape sequences and decode to readable characters. Works for all Unicode planes.
Browser Font Stacks Explorer - Online Defaults Per OS
See which fonts map to generic families (serif, sans‑serif, monospace) on different operating systems. A handy reference.
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.
Browser Screen Recorder - Online Record Tab & Download WebM
Record your screen, window, or tab with audio directly in the browser. Download as WebM. No extension required.
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.
Permissions‑Policy Header Parser - Online Decode & Check
Paste the Permissions‑Policy header and get a human‑readable table of allowed/blocked browser features. Understand how your site is restricted.
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.
Geohash Encoder/Decoder - Online Lat/Lon to String
Encode latitude/longitude into a geohash string and decode a geohash back to coordinates with precision info. Local algorithm.
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.
Hashid Encoder/Decoder - Online Short Unique IDs from Numbers
Convert integers into short, unique, YouTube‑style IDs (hashids) and decode them back. Customize salt and minimum length.
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.
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.
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.
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.
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.
Screen Recorder - Online Record Browser Tab & Download WebM
Record your screen, application window, or browser tab directly using the Screen Capture API. Download as WebM. All local.
Keyboard Shortcuts Viewer - Online Your Browser & OS Keys
Display a dynamic list of keyboard shortcuts for the current browser and operating system. Filter by category. Keep it open for reference.
Email Header Parser - Online Analyze Email Delivery Path
Paste raw email headers and get a human-readable breakdown of the delivery route, authentication results, and delays. Private analysis.
URL Shortener Decoder - Online Expand Shortened Links
Find out the real destination of any shortened link (bit.ly, t.co, etc.) without clicking. Resolves redirects locally using public HTTP headers.
Query String Parser & Builder - Online URL Params Editor
Parse a URL's query string into a key-value table, or build a query string from parameters. Perfect for API testing and web development.
URL Parser - Online Decompose Link into Components
Break down any URL into its individual components: protocol, hostname, path, query parameters. Decode query strings easily. Purely client-side.
User Agent Parser - Online Browser & OS Detector
Paste a user agent string to get a human-readable breakdown of browser, operating system, and device. See your own current agent info automatically.