TrID review
A free utility that ranks likely file types from binary signatures.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
TrID is a file-identification utility for people who need to determine what an unfamiliar file may contain based on its binary signature. It compares files against a separate definitions database and ranks likely file types by probability. Its documented uses include identifying files received by email, supporting forensic analysis, and aiding file recovery. The focus is specific: it helps classify files, rather than offering a broader file-analysis workflow.
The command-line utility can inspect individual files, groups of files, folders, or file lists. Results can include MIME type and other match details in verbose output, and scans can be exported to CSV. TrID can optionally append a guessed extension or change a file’s extension based on its identification. The separate definitions package can be updated online, and users can add or develop definitions for additional formats. That expandable database is useful when the formats of interest are not covered by the definitions already available, while the ranked matches indicate likely types rather than making file identification a broader analysis task.
TrID is free for personal and non-commercial use, and the vendor offers multiplatform and Windows downloads; older Linux downloads are also listed. The utility is desktop software for Windows and Linux, with community support. It suits individuals and small-scale tasks where signature-based identification, batch scanning, or CSV output is the need. Teams looking for broader file-analysis features, or buyers needing a stated commercial-use price and a different support model, should consider alternatives.
TrID pros and cons
- Where it wins
- Ranks likely file types by probability using binary signatures
- Scans individual files, groups, folders, and file lists
- Exports results to CSV and can append or change extensions
- Where it doesn't
- Focused on file identification rather than broader file analysis
- Commercial-use pricing is not stated
- Support is through the community
TrID fact sheet, pricing and score →
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