File Metadata Viewer
View file metadata including MIME type, size, extension, and content type from filename and properties.
How it works
- 1Paste or type your text in the input field
- 2Click "Analyze" — processing happens in your browser
- 3Copy the result or download as a text file
What to do next
About File Metadata Viewer
File Metadata Viewer is part of a collection of single-purpose web and productivity utility tools. View file metadata including MIME type, size, extension, and content type from filename and properties. Each tool is intentionally narrow — it does one thing well rather than offering many overlapping features — which makes the common path predictable and the result easy to verify before you download or copy it.
File Metadata Viewer works well as a bookmarked utility you reach for when you need it. The first visit shows you what the tool does; the second is when you realise it is a low-friction option for the task and worth keeping in your tab list.
File Metadata Viewer is a static page plus a client-side engine. The browser does the work; there is no separate backend in the loop for the actual processing. That architecture is why the tool starts immediately, why it does not depend on the load on a remote service, and why running multiple jobs in a row does not slow it down.
Technically, the work is done by standard browser APIs, loaded as part of the page. Inputs are recognised automatically and validated before the engine begins processing. Files up to 0 MB are supported per run; that ceiling keeps browser memory usage stable on a wide range of devices.
The 0 MB ceiling on input size is the only fixed limit. Output files are produced in standard formats that every common viewer recognises, and the tool runs the same way regardless of how many times you have used it during the session.
The heaviest users of File Metadata Viewer tend to be product managers comparing options, community managers planning posts and analysts pulling lightweight reports. 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.
File Metadata Viewer returns the result as a download. If you are running multiple jobs, the output names will not collide as long as the input names differ. You can re-run with different settings as many times as you like; each run produces a fresh file with no caching trickery in between.
For multi-step jobs, File Metadata Viewer sits next to File Type Detector, File Encoding Detector, and JSON File Viewer. None of them depend on each other — you can use File Metadata Viewer on its own — but together they cover the common variations of the task this page exists to handle.
File Metadata Viewer 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.
Some background on the design choices behind File Metadata Viewer: every option you see on the page is there because a real workflow needs it, and every option that is not shown has been deliberately omitted to keep the common case fast. The bias is toward minimal-but-complete.
As a single-page tool, File Metadata Viewer 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.
Pro tip: File Metadata Viewer works just as well in a private/incognito window as in a normal one, which is occasionally useful when you want zero browser-history footprint of the job. Another tip: if the tool ever feels slow, it is almost always because the browser tab is competing for CPU with another tab — pausing or closing the heavy ones gives the engine room to work.
If File Metadata Viewer appears to hang, the engine is almost certainly still working — large inputs simply take longer to process inside a browser than they would on a server with multi-core scheduling. For inputs near the 0 MB cap, give it up to a minute on a typical laptop before assuming something is stuck.
Open the workspace above to start using File Metadata Viewer. 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
- 1Open the File Metadata 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.
- 3Tweak the controls if the defaults are not quite right for your input. The options are kept short and labelled in plain language.
- 4Click to start the job. The engine (standard browser APIs) processes the input in the page; you can watch the progress indicator until it completes.
- 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
- Plan content without paying for a SaaS dashboard using File Metadata Viewer.
- Sanity-check a webhook response while debugging.
- Generate a campaign asset in seconds for a quick test.
- Audit a marketing page before launch.
- Run a one-off check during a meeting without context-switching.
- Generate a temporary asset for a social post.
- Pull a quick reference number for a status update.
- Run a fast accessibility check before publishing.
- Compare two product variations side by side.
- Validate a setting before circulating it to a team.
FAQ
What metadata is shown?
Filename, extension, MIME type, file size in multiple units, content type category, and base64 detection.
How does MIME detection work?
MIME type is determined from the file extension using a built-in mapping of common extensions.
Can I paste file content?
Yes — paste base64 or text content and the tool will estimate the decoded size.
What formats are recognized?
Common image, audio, video, text, and application formats — over 30 extensions mapped.
Size conversion?
File size is shown in bytes, KB, MB, and GB with human-readable formatting.
Private?
Yes — analysis runs locally.
Do I need to install anything to use File Metadata Viewer?
No installation is needed. File Metadata 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 File Metadata Viewer on any computer you have temporary access to without leaving anything installed on it.
How often is File Metadata Viewer updated?
File Metadata 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.
Does File Metadata Viewer work in Safari, Firefox, Chrome and Edge?
File Metadata 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.
Will I notice a difference in the output from File Metadata Viewer?
File Metadata 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.
Does File Metadata Viewer upload my file to a server?
Your file is processed inside your browser by standard browser APIs. The engine reads the file's bytes from your tab's memory, computes the result, and writes the result back into the tab. You can confirm what the page does by opening developer tools and watching the Network tab during a run — the requests you see are for the tool's static assets only.
Is there a programmatic version of File Metadata Viewer?
File Metadata Viewer 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.
What permissions does File Metadata Viewer need to function?
File Metadata 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.