Online SHA-256 Hash Calculator
Calculation Details
Text, file, and verification in one tool, with GB-scale chunked file processing and Hex/Base64 output
Online SHA-256 Hash Calculator
SHA-256 belongs to the SHA-2 family and produces a 256-bit digest, usually represented by 64 hexadecimal characters. It is widely used for file verification, API signatures, certificates, blockchain applications, and other general-purpose hashing scenarios.
Core Functions
- Text hashing: Calculate the SHA-256 hash as you type, with an option to disable real-time calculation. Character, byte, and newline counts are displayed, with support for empty text, Chinese text, and multiline examples.
- File hashing: Drag and drop a file or select one manually. Files are processed in 4 MB streaming chunks with progress and remaining-time information, supporting GB-scale files.
- Hash verification: Paste an official or externally provided hash and compare it with the calculated result. Matching and mismatching results are clearly indicated.
- Batch hashing: Enter multiple lines of text to calculate one SHA-256 hash per line and copy all results at once.
Output Formats
Results can be output as Hex or Base64, with uppercase/lowercase switching for Hex. A SHA-256 digest contains 64 Hex characters or 44 Base64 characters. Results can be copied as Hex, uppercase Hex, Base64, algorithm plus hash, or JSON. TXT, JSON, and CSV export are also supported.
Processing and Performance
The tool automatically prefers the browser native API or WebAssembly engine and falls back to pure JavaScript when necessary. File hashing uses progressive chunks, so memory usage does not depend directly on file size. Small files can use one-shot native processing when available.
Error Handling
The tool reports missing files, file read failures, unsupported algorithms, and module loading failures. Verification mode also prompts you to complete missing calculated or expected hash values.
Use Cases
Useful for verifying downloaded images and system packages, debugging API signatures, generating data fingerprints, and comparing hash results across programming languages.
Privacy and Data Security
No server API is used. Text and files are processed locally in the browser and are not uploaded or saved. For password storage, use bcrypt or Argon2 instead of direct SHA-256 hashing.
Online SHA-256 hashing for text and files
- Three modes: text hashing, file hashing, and hash verification
- Real-time text hashing with character, byte, and newline statistics plus standard examples
- 4 MB chunked streaming for files, supporting GB-scale files with progress and remaining-time indicators
- Paste an official hash to compare and clearly determine whether it matches
- Hex and Base64 output with uppercase switching, plus algorithm-and-hash or JSON copying
- Multiline batch hashing with TXT, JSON, and CSV export