Convurter
Archives And File Inspection

File Type Checker

Check a file type online from local file bytes, extension, MIME metadata, and common signature signals without uploading the file.

Local files Archives And File Inspection

Waiting

Runs in your browser. Files do not leave your device.

Input

File Type Checker. Inspect file type from local bytes.

Drop fileUp to 25MB. Local only.

Details

How this works

Check whether a downloaded file matches its extension

Choose a file and compare the visible extension, browser MIME type, size, and byte-signature hints before using it in another workflow.

Input 
invoice.pdf.exe renamed as invoice.pdf
Output 
Detected type signals, extension mismatch notes, and basic file facts
Edge cases
  • Some formats share signatures or container structures, so detection can be a best-fit result.
  • Unknown, truncated, encrypted, or proprietary files may only show generic metadata.
  • Files can be intentionally crafted to look like another type.
  • A correct file type does not prove the file is safe or trustworthy.
Accuracy
  • Detection is best-effort and should not be treated as a malware scan.
  • Browser-provided MIME type can differ from byte inspection and filename extension.
  • Use checksum tools when you need to verify exact byte identity against a trusted published hash.
  • Use specialized PDF, image, document, or archive inspectors when you need deeper format-specific signals.
Privacy
  • File bytes are inspected locally in your browser.
  • The selected file is not uploaded to Convurter.
  • Telemetry avoids raw filenames, file contents, and detected byte samples.

Guide

How to use File Type Checker

Step-by-step

  1. Choose the file you want to identify.
  2. Compare the extension, browser MIME type, size, and detected signature notes.
  3. Review extension mismatches, unknown formats, and unexpected executable-like files as warning signs.
  4. Use File Metadata Viewer, File Checksum, ZIP listing, or a format-specific inspector for the next verification step.

Questions

Can I check a file type online without uploading it?

Yes. This page runs the file-type check locally in your browser, so the selected file is not uploaded to Convurter.

Are files uploaded?

No. The selected file is inspected locally in your browser.

What is the difference between file extension and file type?

The extension is the visible suffix such as .pdf or .jpg. The file type is inferred from metadata and byte patterns. They can disagree.

Does this detect viruses?

No. It reports file type signals only. It does not scan for malware, run the file, or check reputation databases.

What should I do if the type looks wrong?

Do not open the file automatically. Check metadata, compare a checksum against a trusted source if available, and use a specialized inspector for PDFs, images, documents, or archives.

Workflow fit

Use File Type Checker in the right place

If you are unsure, use the related tools and family hub to choose the closest workflow before committing to an output.

Best for

  • Local file and archive workflows where packaging, extraction, listing, type checks, metadata, or hashes help before sharing.
  • Inspecting what a file appears to be before using it in a larger workflow.
  • A focused inspect task where the expected output is file-report.

Before you start

  • This tool runs in the browser, so keep the tab open until the result is created and downloaded or copied.
  • Treat files and archives from unknown sources as untrusted, even when the extension looks normal.
  • List archive contents before extraction when you only need to inspect what is inside.
  • Keep source files until the ZIP or TAR output has been opened and checked.
  • Use the report as a decision aid, then route to cleanup, conversion, or verification tools if it finds something notable.

Quality checks

  • Treat inspection output as a signal report, not as a guarantee that every possible issue was checked.
  • Verify file count, names, sizes, checksums, and detected type against what you expected.
  • Remember that file type and metadata inspection are not malware scanning.
  • Checksum final artifacts when exact byte identity matters.
  • Copy or download the result only after confirming the displayed output matches the task you intended.

Common mistakes

  • Opening extracted files automatically is risky; inspect and download deliberately.
  • Assuming an extension proves file type. Byte signatures and browser metadata can disagree.
  • Using checksum output as proof that a file is safe. Checksums prove identity, not safety.
  • Closing the tab before downloading or copying a browser-generated result.
  • Treating the first result as final without checking the destination requirement.

Verify or clean up

Use these when the output needs checking, cleanup, comparison, compression, or a final share-ready pass.

PDF Metadata Viewer

Next

File Metadata Viewer METADATA File Checksum HASH List ZIP Contents FILE-LIST PDF Metadata Viewer METADATA