File SHA-256 Checksum
Choose a file and calculate its checksum. Optionally paste the 64-character SHA-256 supplied by its source. A match checks content consistency; it does not establish who published the file or whether it is safe.
Enable JavaScript to calculate locally. The file is not uploaded.
Check file contents
Any single file, up to 128 MiB (134,217,728 bytes), including empty files. Contents are read only after you start calculation.
Paste only the 64-character hexadecimal checksum; either case, without a prefix, filename, or internal spaces.
Choose a file, up to 128 MiB.
Awaiting calculation
Switching languages leaves the current result.
Files stay in this browser
File contents are processed in this browser, without uploads, accounts, or saved history. The website still loads its pages and code; after the initial load, calculations do not need further dependency downloads.
Clearing or leaving the page drops the tool's file and result references. It does not erase operating-system memory or remove copied or downloaded content. Checksums are exported only when you choose Copy or Download.
Questions about checksums
Is my file uploaded?
No. The raw file bytes are processed in this browser. Opening the website still loads page assets, and the server receives normal website connection information.
Why is the limit 128 MiB?
Web Crypto needs the entire file in memory. This tool accepts up to and including 128 MiB and does not provide streaming for larger files. Low memory can cause a calculation to fail; choose a smaller file.
Does renaming a file change its checksum?
No. The name, MIME type, and modification date do not affect the calculation. Only the raw bytes count; a changed line ending or a single changed byte affects the checksum.
Does a matching checksum mean the file is safe?
No. Obtain the expected checksum from a source you trust. This tool checks content consistency; it does not scan for malware, check signatures, or verify the publisher's identity.