What is File Metadata Viewer?

File Metadata Viewer shows a file's properties — name, size, MIME type, last modified date, and a SHA-256 checksum. Drop any file to see its details without uploading anything to a server.

The viewer reads file metadata exposed by the File API: filename, byte size, MIME type, extension, and the last-modified timestamp. For images it also reports pixel dimensions and shows a thumbnail preview, and for JPEG photos it pulls EXIF camera settings — make, model, lens, focal length, aperture, shutter speed, ISO, and date taken — plus GPS coordinates with a map link when the photo is geotagged. It compares the shoot date against the file's modify date and flags photos that were re-saved after capture. For audio and video it reports duration, and for video the resolution too. For PDFs and Office files (Word, Excel, PowerPoint) it surfaces the title, author, who last edited it, creation and modification dates, the producing app, and the page, sheet, or slide count. It computes a SHA-256 checksum so you can verify file integrity, and you can drop several files at once to scan them side by side in a comparison table. Export everything as JSON or CSV. All processing happens locally, so the file never leaves your device.

How to use

1. Step 1 — Drag and drop one or several files, or click to select them from your device.
2. Step 2 — View the metadata table showing name, size, type, and last modified date.
3. Step 3 — Copy the metadata, or download it as JSON or CSV to keep a record.

When to use

• Checking the pixel dimensions of a photo before uploading it to a platform with a size cap.
• Confirming the MIME type a file actually reports, not just what its extension claims.
• Reading the duration of an audio clip or video before naming or trimming it.

Result

Drop a photo from your phone to check its file size (3.2 MB), MIME type (image/jpeg), and last modified timestamp (2026-02-14 09:30).

FAQ

Does this read EXIF data like camera model or GPS coordinates?

Yes, for JPEG photos. It reads camera make and model, lens, focal length, aperture, shutter speed, and ISO straight from the EXIF block, and pulls GPS coordinates when the photo was geotagged, with a one-click link to open the spot on a map. It also compares the original shoot date with the file's modify date and flags a photo that was re-saved after capture. Other formats like PNG or WebP rarely store EXIF, so those fields stay hidden.

Why does the last-modified date sometimes show today's date even for old files?

The timestamp comes from the file's last-modified attribute on disk. Some apps rewrite it when you save, sync, or even just download a file. Cloud storage and copy operations frequently reset it to the moment of transfer.

Will my file get uploaded anywhere?

No. The file is read locally on your device and never sent to a server. No copy is made anywhere — close the tab and the in-memory reference disappears immediately.

Why doesn't the MIME type match what I expect?

The MIME type is derived from the file extension, not from inspecting actual bytes. A renamed file (cat.txt that's really a JPEG) will report text/plain. For byte-level detection, use a magic-number tool like the file type identifier.

Why are dimensions missing for some image files?

If the image can't be decoded (corrupted file, unsupported format like HEIC on some platforms, very large RAW files), the dimension probe returns nothing. Other metadata fields still appear normally.

Related Tools