Cookie Analyzer — Parse & Inspect
Parse a Set-Cookie or Cookie header and display all attributes with security recommendations.
How it works
- 1Paste or type your text in the input field
- 2Click "Process" — processing happens in your browser
- 3Copy the result or download as a text file
What to do next
About Cookie Analyzer
Cookie Analyzer is the kind of utility you bookmark and reach for when you need it. Parse a Set-Cookie or Cookie header and display all attributes with security recommendations. It loads quickly, works on any modern browser, and produces a result you can download or copy in a single click.
Behind the controls you see, standard browser APIs is doing the actual web and productivity utility. Formats are detected on load and the engine produces a deterministic output for any given input + options combination — useful when you need to re-run a job and expect identical results.
Cookie Analyzer parses your file with standard browser APIs entirely inside the browser, applies the options you selected, and returns a download. The processing has no network step, which means a slow or intermittent connection does not slow down the work — once the page is loaded, only your CPU and RAM are involved.
If you fit any of these descriptions, Cookie Analyzer should slot cleanly into your workflow: marketers running campaigns; teachers building resource lists; site owners auditing pages. The tool keeps the controls focused on what matters for each of these use cases.
The right moment to reach for Cookie Analyzer is when you have a focused web and productivity utility job that fits inside a browser tab. Open the page, drop in the file or paste your input, choose the options that matter, and the tool returns the result.
The hard constraints are easy to remember. Maximum input: 0 MB. Multiple files per run: no — one input at a time, by design, to keep results predictable. The same controls apply on every run.
Cookie Analyzer sits in a small group of related tools. Useful neighbours include CSP Header Validator, Session Token Generator, TOTP Generator, and Email Header Analyzer. They are designed to compose: the output of one is a sensible input to the next, so a multi-step task is usually a sequence of single-click operations.
Cookie Analyzer keeps the control set focused. Every option on the page is there because a real workflow needs it, and the defaults aim at the most common case so a first-time user can get the right output without changing any settings.
The download is delivered as a clearly named file the moment processing completes — no email link, no "your result will be ready in 5 minutes" queue, no expiry timer. The file is generated in your browser and saved by your browser's normal download flow.
Some context on why Cookie Analyzer exists in this form: modern File APIs, high-performance JavaScript engines, and well-maintained open-source libraries now make it possible to perform web and productivity utility work entirely in the browser. Cookie Analyzer is built on top of that capability, which is why a single page can host the full pipeline.
As a single-page tool, Cookie Analyzer stays focused on one web and productivity utility step. Multi-step workflows are composed by chaining adjacent tools — each tool produces a standard file the next one can read directly, so a longer pipeline is just a sequence of short tab-and-tab visits.
A few practical tips that experienced users of Cookie Analyzer pick up over time. First, keep your default browser updated — the engine relies on standard web APIs and newer browser versions are noticeably faster than ones from a few years ago. Second, close other heavy tabs before processing a large input; the engine shares CPU and memory with whatever else is open. Third, if you re-run the same kind of job often, your last-used settings are remembered for the rest of the tab session, so subsequent runs are essentially one click.
If the result is not what you expected, the most common causes are easy to check. Confirm the input is under the 0 MB ceiling — files just above the cap fail silently because the engine refuses to allocate the buffer. Confirm the input is one of the supported formats. And if the page itself feels slow, try closing other heavy tabs to free up memory; the engine runs in your browser, so it competes for the same resources as everything else open.
Open the workspace above to start using Cookie Analyzer. The engine loads on the first interaction so the page itself stays light, and once the tool is warm it processes subsequent jobs quickly. The moment the page is interactive, the tool is ready to do real work on your file.
How it works
- 1Reach the Cookie Analyzer page in your browser to begin.
- 2Drop a web utility file onto the upload area, or click to pick one from your device.
- 3Tweak the controls if the defaults are not quite right for your input. The options are kept short and labelled in plain language.
- 4Trigger processing. standard browser APIs reads your input, applies the transformation, and writes the result back into the page.
- 5Grab the output as soon as the run completes. You can also copy the result instead of downloading if the next tool in your workflow accepts pasted input.
- 6Re-run with different settings as often as you want. Each run produces a fresh output and the original file on disk is never modified.
Common use cases
- Validate a setting before circulating it to a team using Cookie Analyzer.
- Run a one-off check during a meeting without context-switching.
- Plan content without paying for a SaaS dashboard.
- Compare two product variations side by side.
- Preview how a result looks before deploying it.
- Pull a quick reference number for a status update.
- Generate a campaign asset in seconds for a quick test.
- Create a placeholder image for a wireframe.
FAQ
What is analyzed?
Cookie name, value, Domain, Path, Expires, Max-Age, Secure, HttpOnly, and SameSite attributes.
Security checks?
Warns about missing Secure, HttpOnly (for session cookies), SameSite, and oversized values.
Cookie size limit?
Browsers limit individual cookies to about 4 KB. The tool warns if this is exceeded.
Private?
Yes — parsing runs locally.
Multiple cookies?
Analyze one Set-Cookie header at a time. For multiple cookies, run the tool for each.
SameSite default?
Modern browsers default to SameSite=Lax when the attribute is not explicitly set.
How many times per day can I use Cookie Analyzer?
Inputs are capped at 0 MB per file, which keeps memory usage stable across phones, tablets and older laptops. You can run Cookie Analyzer as often as you need; every run produces a full-quality result.
How do I run Cookie Analyzer over a folder of files?
Cookie Analyzer processes one input at a time by design — it keeps memory usage predictable on lower-end devices and makes results easier to verify. To handle a folder, run the tool once per file; the page stays loaded between runs and remembers your last-used settings, so the second run is essentially instant.
Do I need a specific browser to use Cookie Analyzer?
Cookie Analyzer works in any modern browser released in the last few years — Chrome, Edge, Firefox, Safari, Brave, Arc and the major Chromium derivatives are all supported. The underlying engine relies on widely-supported web APIs, so there is nothing exotic to install. If you are on a very old browser version and the tool fails to load, updating to the latest release of your preferred browser is the only fix needed.
Is there a programmatic version of Cookie Analyzer?
Cookie Analyzer is a browser-only tool by design and does not expose a hosted API. The reason is the same as the privacy story: there is no Favtoo backend doing the work, so there is no service to call. If you need to script the same transformation, the underlying engine (standard browser APIs) is open-source and can be used directly from your own code.
Why does Cookie Analyzer feel slow on large inputs?
Most jobs finish in seconds. Speed scales with input size and with how many CPU cycles your browser tab has available — the engine runs in your browser, so it shares resources with whatever else you have open. For inputs near the 0 MB ceiling, expect anywhere from a few seconds to roughly a minute on a typical laptop. Closing other heavy tabs noticeably speeds things up.
Can I use Cookie Analyzer with formats other than the defaults?
The accepted formats are listed in the upload area on the tool itself. If your input is in a format that is not directly supported, convert it first using one of Favtoo's converter tools — every Favtoo converter outputs a file that is a clean input to the next tool in the chain.
How accessible is the Cookie Analyzer interface?
Cookie Analyzer uses native HTML controls wherever possible, which means keyboard navigation, focus rings, and screen-reader labels work the way the platform expects. The drop zone accepts files via the keyboard-accessible file picker as well as drag-and-drop, and result downloads use standard browser download flows. If you spot an accessibility gap, Favtoo treats it as a bug worth fixing.
Can I use Cookie Analyzer on iOS or Android?
Cookie Analyzer runs in any modern mobile browser — Safari, Chrome, Firefox and the in-app browsers in most messaging apps all support the underlying APIs. Performance depends on the device: a recent phone handles typical inputs nearly as fast as a laptop, while older devices may take a few seconds longer near the 0 MB ceiling. The interface lays out cleanly on small screens, so you do not need to pinch-zoom to see the controls.
Are jobs run with Cookie Analyzer stored anywhere?
Favtoo keeps no copy of your file because Favtoo never receives your file. Cookie Analyzer runs entirely in your browser, the input is held only in your tab's memory, and closing the tab discards it. There is no opt-in cloud history, no "recent jobs" panel synced to an account, and no server-side retention to configure — the architecture simply has nowhere for your file to be stored.