O que File Checksum Calculator faz?
File Checksum Calculator permite inspecionar dados diretamente no navegador e informa com clareza o resultado e os limites. Recursos verificados: Local file hashing, Expected-value verification, Four algorithms, 200 MB guardrail.
A matching checksum proves equality, not trust
A match shows that the file bytes equal the bytes used to publish the checksum. It does not prove who published either value; use a signed release, authenticated channel, or package signature when origin matters.
Como usar?
- Choose SHA-256, SHA-512, SHA-1, or MD5, then select one local file no larger than 200 MB.
- Optionally paste the publisher’s expected checksum; spaces and letter case are ignored during comparison.
- Confirm Match or Mismatch and copy the calculated checksum with its algorithm name.
Exemplo real de entrada e saída
Verify a three-byte text file
Entrada
File bytes: 61 62 63 (UTF-8 text "abc")
Algorithm: SHA-256Saída
ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015adThis known SHA-256 value verifies that the selected file contains exactly the three bytes for abc.
Erros comuns e correções
| Sintoma | Causa provável | Correção |
|---|---|---|
| The calculated value does not match the published checksum. | The download is different, damaged, transformed, or compared with the wrong algorithm. | Confirm the algorithm and source, download the file again, and do not use it until the mismatch is explained. |
| The file is rejected before hashing. | The selected file exceeds the page’s 200 MB browser-memory guardrail. | Use a streaming desktop checksum utility for larger files. |
Important behavior of File Checksum
Limite específico desta ferramenta: A matching checksum proves byte equality, not that the publisher or file is trustworthy.
Padrões e referências de implementação
- W3C Web Cryptography API (opens in a new tab)Defines the browser digest API used for SHA calculations.
- NIST FIPS 180-4 — Secure Hash Standard (opens in a new tab)Specifies the SHA algorithms exposed by this tool.
File Checksum — FAQ
Does the File Checksum upload my input?
No. Processing runs in the current browser tab, and the page does not send tool input to a KitLumi processing endpoint.
What input does the File Checksum accept?
It accepts one local file up to 200 MB and an optional expected checksum. The workspace checks the input and reports malformed or unsupported values before it produces a result.
What does the File Checksum produce?
It produces an MD5, SHA-1, SHA-256, or SHA-512 hexadecimal digest. Copy and download controls appear when the output format supports them.
What limitation should I know?
A matching checksum proves byte equality, not that the publisher or file is trustworthy.
O que mudou?
Atualização material: File Checksum: Added Local file hashing, Expected-value verification, Four algorithms, 200 MB guardrail, responsive controls, explicit runtime disclosure, and task-specific examples and limitations.