CookieSnap

About

CookieSnap is a tool built for developers, testers and anyone who needs full control over cookies in their browser. All processing happens locally on your device, no data is ever sent anywhere outside.

Export Formats

CookieSnap supports four export formats tailored to different use cases. Netscape format (.txt) is fully compatible with curl, wget, MozillaCookieJar (Python 3) and other popular tools. JSON format contains complete cookie data in a structure ready for further processing. Header String format generates a ready-to-use HTTP Cookie header for direct use in requests. CSV format enables convenient data analysis in spreadsheet applications.

Key Features

The extension displays all cookies from the active page in a clear table with sortable columns, just click any column header to sort. The built-in search bar lets you instantly filter cookies by any phrase. Row colouring makes it easy to distinguish session cookies, secure cookies (Secure flag) and cookies protected from JavaScript (HttpOnly flag). The readable time option converts raw Unix timestamps into a human-friendly GG:MM DD/MM/YYYY format. The copy button lets you copy cookies to the clipboard in a single click.

Cookie Diff

CookieSnap includes a unique cookie comparison feature accessible via the "Cookie Diff" button. It allows you to take two snapshots of cookie state at any point in time and compare them side by side. This is particularly useful when testing login flows, analysing sessions or tracking changes made by page scripts. Comparison results are clearly colour-coded, green indicates added cookies, red indicates removed ones and yellow indicates changed values.

Privacy and Security

The extension has no backend server and makes no network connections whatsoever. The source code is transparent and unobfuscated, you can verify it yourself in the extension installation directory.

Extension installation directory:

Windows: %LOCALAPPDATA%\Google\Chrome\User Data\Default\Extensions
Mac: ~/Library/Application Support/Google/Chrome/Default/Extensions
Linux: ~/.config/google-chrome/Default/Extensions

Required Permissions

The extension requires the following permissions, each serving a specific purpose. The activeTab permission is used to read the URL of the active tab. The cookies permission enables reading cookies, the extension never modifies or sends cookies anywhere. The downloads permission is used exclusively to save the export file locally to disk. The notifications permission is used to notify you about extension updates. The storage permission saves your interface preferences locally on your device.

Compatibility

CookieSnap works on Windows, Mac and Linux wherever Google Chrome is available. The Netscape format generated by the extension is fully compliant with the standard supported by curl, wget and MozillaCookieJar in Python 3.

⚠️ Note: If you are using Google Chrome older than version 119, some cookies with partition keys may not be visible due to limitations of the older browser API.