Skip to content
Toolars
Explore
Report bug

Developer · Local utility

SHA-1 Hash & Verify

Hash text or files with SHA-1 and verify against a known 40-character digest, locally. Deprecated for signatures; fine for legacy identifiers.

Task path / input to outcome

Choose text or file

Runs locally · Nothing is uploaded

How SHA-1 Hash & Verify works, privacy, and related tools

Task path / input to outcome

How to create or verify a SHA-1 digest

  1. 01

    Choose text or file

    Text uses UTF-8 without normalization. Choose File bytes to hash an original file, including an empty file. The filename and MIME type are not part of the digest.

  2. 02

    Create the digest

    Stay on the Hash tab and press Create digest. The local engine computes the digest and shows it in the read-only SHA-1 digest field as 40 lowercase hexadecimal characters, the same spelling used by release pages and checksum files.

  3. 03

    Or verify against a reference

    Switch to the Verify tab, paste the published value into Expected SHA-1 digest, and press Verify digest. Letter case and surrounding whitespace are normalized before comparison, and the status line answers Digest matches or Digest does not match.

  4. 04

    Copy or save the digest

    Use Copy digest for the clipboard or Download .txt to save the value as toolars-sha1-digest.txt. Until a digest exists, the workspace says so instead of copying or saving an empty value, so a slip never produces a blank file.

  5. 05

    Clear between checks

    Clear empties the input, the expected digest, and the result in one step, and the status returns to Ready. Nothing is kept between runs, so a list of identifiers can be checked one after another without leftovers.

Tool facts

Processing
In your browser
Input leaves this device
Never
Retention
Nothing is stored
Price
Free

Your input stays in the browser.

SHA-1 Hash & Verify uses its verified local execution path and does not create a hidden input or output history.

Local execution

Runs inside the current browser tab.

No hidden processing

Active tool data never becomes a Toolars document record.

No account required

Use the core workflow without creating a profile. Favorites sync to your account after you sign in.

Immediate reset

Clear the tab and the active working data is gone.

When SHA-1 Hash & Verify is useful

Integrity checks

Compare a known digest with locally hashed text or configuration data.

Candidate verification

Verify a value you already know without attempting unsafe brute-force recovery.

Legacy interoperability

Inspect required MD5 or SHA values while keeping their security limits explicit.

What SHA-1 Hash & Verify actually does

An archive publishes a SHA-1 checksum for a downloaded file. Choose File bytes, enter that checksum on Verify, and compare the result. A match confirms the bytes against the supplied value, not who published it; verify the reference through a trusted channel.

Common questions

What input is accepted?
Text is hashed as entered in UTF-8 without normalization (up to 1 MiB). Files use their original bytes, including an empty file, in 1 MiB chunks up to 256 MiB; filename and MIME type are excluded. The cancellable local Worker has a 15-second run limit. A matching digest does not authenticate the source of the reference.
What form must the expected digest take?
Exactly 40 hexadecimal characters; letter case and surrounding whitespace are normalized automatically. Anything else is rejected before hashing, because no SHA-1 digest can look like that — so a pasted value with a stray character fails fast instead of silently mismatching.
Is SHA-1 still safe to use?
SHA-1 collisions have been demonstrated, so it is deprecated for signatures and other security uses; prefer SHA-256 or stronger there. As an identifier in legacy systems it remains serviceable. Like every digest here it is one-way: the tool recomputes and compares, and never decrypts or brute-forces.
Can this tool reverse or crack a hash?
Verification compares digests of the selected input locally; it does not decrypt a digest or authenticate its source.
Can I hash a file instead of text?
Yes. Choose File bytes and select a local file up to 256 MiB. The Worker reads 1 MiB chunks; it never uploads the file. A cancelled or timed-out run produces no digest.
Is my text uploaded anywhere?
No. Hashing runs fully inside the current browser tab, input and digests are not retained, and no account is required. Pressing Clear or closing the tab discards every field, so the only copy of what you checked is the one you choose to keep.

Continue in Developer

Related tasks, not a dead end.

Move into another focused workspace without returning to the full index.

Code to Image Converter

Export syntax-highlighted code as PNG or SVG for six languages with light and dark themes, line numbers, a window title, and 1x or 2x scale.

Create

URL Slug Generator

Turn titles into clean URL slugs with hyphens or underscores — accents stripped, ampersands expanded, non-Latin scripts preserved — live as you type.

Create

React Native Shadow Generator

Compare legacy shadow properties and boxShadow for React Native, tune iOS and Android output side by side, and copy the StyleSheet code.

Create

Base64 Encoder/Decoder

Encode Unicode text to Base64 or decode it back with live validation, URL-safe and UTF-8 options, and a swap button for round trips.

Convert