# File type inspector > Browser-only file conversion. Selected files are processed on this device and are not uploaded to a conversion server. Source: https://localconverter.tech/inspect-file Inspect file signatures and compare supported detected types with the filename. Recognizes common images, PDFs, ZIP-based Office/EPUB files, archives, audio and video containers. Unknown binary data is reported as unknown rather than guessed from its extension. Choose the supported original file using the file picker or drop zone. Check the accepted input types listed above the workspace. ## Useful tasks - Inspect a file report before choosing a conversion. - Review available file properties and detected details. - Check a source independently of its filename extension. ## Steps 1. **Provide the source**: Choose the supported original file using the file picker or drop zone. Check the accepted input types listed above the workspace. Read the operation note before starting, because supported syntax and file limits are part of the result contract. The original file is not overwritten or renamed by this workflow. 2. **Choose the intended result**: This operation uses a fixed report format, so no extra output configuration is required. Change settings according to the file or text you actually supplied. Defaults are a starting point rather than a promise that every source uses the same conventions. Recognizes common images, PDFs, ZIP-based Office/EPUB files, archives, audio and video containers. Unknown binary data is reported as unknown rather than guessed from its extension. 3. **Create and inspect the output**: Use the main action button to run file type inspector. Local processing checks the source and reports malformed or unsupported inputs. A completed job appears in Your results, with a download action and a preview when the output supports it. If the operation fails, read its message and correct the source or settings before retrying; changing only a filename does not change file contents. 4. **Save and verify the result**: Download the finished output and open it in the application or workflow that will consume it. Choose the original source, adjust the settings, create the result and inspect the saved output. Check the values, layout, encoding or parsed structure relevant to your task. Keep the source when you may need another set of settings later. Temporary job downloads are session-owned and expire; saving your own copy is the way to retain a result. ## Settings ## Try file type inspector with a small source Choose one small supported * file. Use the initial settings, inspect the result and then change one setting to understand its effect. Recognizes common images, PDFs, ZIP-based Office/EPUB files, archives, audio and video containers. Unknown binary data is reported as unknown rather than guessed from its extension. ## Check the result Choose the original source, adjust the settings, create the result and inspect the saved output. Recognizes common images, PDFs, ZIP-based Office/EPUB files, archives, audio and video containers. Unknown binary data is reported as unknown rather than guessed from its extension. Open the saved output in the app or workflow where you plan to use it. Check one representative result before repeating the same settings with more files. The original files stay unchanged. ## Limits - Files are processed on this device. Browser memory and engine-specific limits apply. Save results before reloading. - Recognizes common images, PDFs, ZIP-based Office/EPUB files, archives, audio and video containers. Unknown binary data is reported as unknown rather than guessed from its extension. - Upload one file with a combined size of at most 100 MB. The completed output must fit within 200 MB. - Files are checked by the local engine; a matching filename alone is not proof of valid contents. - Selections and completed jobs stay available while you navigate inside this tab. Use My files to revisit results. Reloading or closing the tab clears the workspace; download results you want to keep first. ## Questions ### What does File type inspector produce? Inspect file signatures and compare supported detected types with the filename. Recognizes common images, PDFs, ZIP-based Office/EPUB files, archives, audio and video containers. Unknown binary data is reported as unknown rather than guessed from its extension. ### Which source should I use? Choose the supported original file using the file picker or drop zone. Check the accepted input types listed above the workspace. Supported file extensions are *. The processing engine checks actual contents; a matching extension alone does not make malformed content valid. ### Why did this input fail? Recognizes common images, PDFs, ZIP-based Office/EPUB files, archives, audio and video containers. Unknown binary data is reported as unknown rather than guessed from its extension. Check syntax, required inputs and the ranges shown next to settings. An error keeps unsupported data from being presented as a successful conversion. Correct the source and retry rather than repeatedly resubmitting an unchanged invalid input. ### How should I check the download? Choose the original source, adjust the settings, create the result and inspect the saved output. Review the saved content in its destination application, including a typical case and any boundary values important to your use. A completed operation confirms processing finished; it cannot determine whether the supplied settings match your wider business requirements. ### Does File type inspector upload files to another service? Processing runs in this browser, on your device. Files and pasted input are not uploaded to a conversion server. The website and required engine assets must load first; large operations depend on available device memory. ### Can I continue after changing pages? Selections and completed jobs stay available while you navigate inside this tab. Use My files to revisit results. Reloading or closing the tab clears the workspace; download results you want to keep first. ## Related guides - [Inspect & unpack archive](https://localconverter.tech/archive-browser.md) - [View / remove image metadata](https://localconverter.tech/image-metadata.md) - [PDF metadata editor](https://localconverter.tech/pdf-metadata.md) - [JSON to CSV](https://localconverter.tech/json-to-csv.md) - [JSON to TSV](https://localconverter.tech/json-to-tsv.md)