Cookie Viewer — Parse & Inspect
Parse and inspect cookie data from JSON or key=value format with value decoding and size analysis.
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 Viewer
Cookie Viewer is the kind of utility you bookmark and reach for when you need it. Parse and inspect cookie data from JSON or key=value format with value decoding and size analysis. It loads quickly, works on any modern browser, and produces a result you can download or copy in a single click.
The heaviest users of Cookie Viewer tend to be teachers building resource lists, community managers planning posts and marketers running campaigns. Each group brings slightly different expectations to the tool, but the same single-page architecture serves every one of them with the same response time.
Cookie Viewer performs the transformation entirely inside the JavaScript runtime. Your file lives in the tab's memory while the engine works on it; the result lives in the tab's memory until the browser triggers the download. Both are released when the tab closes, the way every browser tab releases its memory.
Cookie Viewer is implemented on top of standard browser APIs. Inputs are read from the file picker or drop zone, decoded in the browser, processed, and re-encoded into the output format. Files up to 0 MB are well within the comfort zone of any modern browser.
Cookie Viewer is shaped for the gap between "I'll do it by hand" and "I'll script it." When the job is small enough that automating it would take longer than doing it, but annoying enough to want a focused tool — that is the situation this page is built for.
For multi-step jobs, Cookie Viewer sits next to localStorage Viewer, sessionStorage Viewer, and IndexedDB Viewer. None of them depend on each other — you can use Cookie Viewer on its own — but together they cover the common variations of the task this page exists to handle.
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.
A practical note on limits: Cookie Viewer accepts inputs up to 0 MB per run, and the tool processes one input at a time to keep memory usage predictable. If you ever bump into the ceiling, the cause is the size of the input.
Cookie Viewer is honest about scope: it handles a single, well-defined web and productivity utility step. Specialist edge-case work — uncommon formats, very large inputs, or pipelines that need scripting — is what dedicated desktop apps are for. This page handles the common case quickly.
A short note on how Cookie Viewer came to look the way it does: every iteration started by watching how someone unfamiliar with the tool actually used it, then removing whatever got in their way. That is why the upload area dominates the screen, the run button is bigger than the secondary controls, and the result panel is unmissable when the job finishes.
If you want to get the most out of Cookie Viewer, three small habits help. Drag-and-drop is faster than the file picker once you get used to it. The keyboard shortcut for downloading the result is whatever your browser uses for "save link as," because the result is a normal download. And if you are working on a sensitive file, processing in an Incognito or Private window is a good extra layer — it leaves no trace in browser history when the tab closes.
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.
Cookie Viewer produces deterministic output: the same input plus the same options always produces the same result. That predictability matters when the result has to match an upstream specification or be reproducible later.
Cookie Viewer is one of many single-purpose tools in the catalog. Each is built around the same single-page model. Use this one, close the tab, and come back the next time you need the same job done. None of the tools require prior knowledge of the others — each page is self-contained.
How it works
- 1Open the Cookie Viewer workspace above. The interface is a single page, so there is nothing to navigate.
- 2Drop a web utility file onto the upload area, or click to pick one from your device.
- 3Adjust the options to match what you need. Sensible defaults cover the most common case, so you can usually skip this step.
- 4Hit the run button. standard browser APIs does the work in your browser tab.
- 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.
- 6Repeat the process for additional inputs whenever you need to. The page stays loaded, so subsequent runs are quick.
Common use cases
- Sanity-check a webhook response while debugging using Cookie Viewer.
- Audit a marketing page before launch.
- Run a one-off check during a meeting without context-switching.
- Validate a setting before circulating it to a team.
- Run a fast accessibility check before publishing.
- Preview how a result looks before deploying it.
- Create a placeholder image for a wireframe.
- Compare two product variations side by side.
- Pull a quick reference number for a status update.
- Plan content without paying for a SaaS dashboard.
FAQ
Input formats?
Accepts JSON objects or semicolon-separated key=value pairs (as in document.cookie).
URL decoding?
URL-encoded values are automatically decoded and shown alongside the raw value.
JSON in cookies?
If a cookie value is valid JSON, it is pretty-printed for easier reading.
Private?
Yes — parsing runs locally.
Size limit?
Individual cookies should be under 4 KB. Total size warnings are shown.
How to export cookies?
In DevTools console: document.cookie gives current cookies as a semicolon-separated string.
How fast is Cookie Viewer?
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.
Does Cookie Viewer require a browser extension or plug-in?
No installation is needed. Cookie Viewer runs as a normal web page, with no browser extension, no native helper, and no separate desktop client to download. That is partly a privacy choice — extensions can request broad permissions, while a regular page is sandboxed by default — and partly a convenience one: you can use Cookie Viewer on any computer you have temporary access to without leaving anything installed on it.
Does Cookie Viewer work in Safari, Firefox, Chrome and Edge?
Cookie Viewer 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.
Does Cookie Viewer ask for any browser permissions?
Cookie Viewer only needs the standard web platform — file picker access for the inputs you choose to load, and optionally clipboard access if you copy the result rather than downloading it. There is no microphone, camera, geolocation or background-permission request, because none of those are needed for the work the tool does.
Can I process multiple files at once with Cookie Viewer?
Cookie Viewer 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.
How do I know I am using the latest version of Cookie Viewer?
Cookie Viewer is updated whenever the underlying engine releases an improvement or a bug fix. Because the tool is delivered as a static page, every visit fetches the latest version automatically — there is no "version" to manage on your end. If a particular release ever changes default behaviour, the change is documented on Favtoo's changelog so you can confirm what shifted.
Is Cookie Viewer lossless?
Cookie Viewer is built to preserve quality wherever the underlying web utility format allows it. Operations that are mathematically lossless (e.g. structural transformations, lossless re-encoding) round-trip with no perceptible change. Operations that involve a lossy codec inevitably introduce small artefacts at the byte level, but the defaults aim at the sweet spot where output looks or sounds the same to a normal viewer or listener while still being meaningfully smaller or faster than the input.