Local file tool
Image file SHA-256
Compute, copy and compare a hash of the local file bytes.
18 October 2026 · Check AI Free
Local file-byte fingerprint
Compute and check a file SHA-256
Hash the complete original file, including metadata. A metadata edit can change this hash while the decoded picture stays the same. SHA-256 does not establish an author or certify a picture.
Supported files and output
Compute SHA-256 over the exact original bytes with Web Crypto, up to 20 MiB per file. Copy/download a filename-free local report and compare a pasted 64-hex expected hash. Cancellation discards a late digest result; the underlying browser digest cannot be interrupted. A hash identifies bytes, not an author, safe file or authentic image.
Read the result with its coverage
Stored fields can be edited, copied or removed. A successful read describes the selected file’s supported containers; missing fields cannot be recovered from its pixels. A damaged or unsupported container has its own result. Review private values before copying or sharing a report.
These file operations run locally. The separate image checker can send file-header data and a reduced image copy for a model reading. Read the method and limitations when that is the task you need.
Continue the task
- Image file checks: format, dimensions, hashes and defined pixel differences — Choose a local file check for container type, display dimensions, exact duplicate bytes or native-size sRGB RGBA differences, with three reproducible synthetic scenes.
- Compare SHA-256 before and after a metadata edit — Hash a known PNG, replace one exact text field, and check the saved output against the expected digest while its compressed image data remains unchanged.
- Prepare an image file for the check you need — Check actual format, byte size, encoded/display dimensions and known file history, then choose a supported local field, hash, pixel or optional model workflow.
- EXIF viewer and exports — Inspect the stored camera, location and caption fields.
- Remove selected metadata — Create a verified static-image copy with supported categories removed.
- Choose another file operation — Browse available tools by task.