SHA-1 Generator
Compute SHA-1 hashes of text or files in your browser with native WebCrypto — still common in Git commits and legacy checksums. Fully client-side.
Next steps
This tool runs entirely in your browser. Your data never leaves your device — it is not uploaded to any server.
How to use
- 1Type or paste the text — the digest updates as you type.
- 2Or switch to File mode and drop a file to hash it locally.
- 3Copy the hexadecimal digest and compare it with the expected value.
SHA-1 Generator
Verifying a legacy download checksum, matching a Git object ID, or talking to an older system that still publishes SHA-1 — paste text or drop a file and its 160-bit digest appears live, computed entirely inside your browser.
Output is lowercase hexadecimal, exactly 40 characters, and updates as you type; file mode hashes locally so nothing is uploaded. The digest follows FIPS 180-4 and matches any other correct SHA-1 implementation byte for byte.
Hashing runs through the native WebCrypto SubtleCrypto API, the same audited code path your browser uses for TLS — faster and far less bug-prone than a hand-rolled JavaScript implementation.
For new designs, avoid it: SHA-1 has been collision-broken since the 2017 SHAttered attack and NIST deprecated it for signatures back in 2011 (Git now pairs it with collision detection). Use SHA-256 instead — this tool exists for compatibility with what already ships.
Frequently asked questions
q
a
q
a
q
a
Is the output safe to paste into production code?
Yes. Formatting, escaping and conversion follow the relevant specs (RFCs, W3C, JSON Schema), and nothing is sent anywhere — you can verify the output locally before committing it.
Does it work on large inputs?
Yes — everything runs locally. A multi-megabyte JSON file or a long regex session is limited only by your machine, not by a request size cap.
Is this tool free to use?
Yes, completely free — no signup, no subscription, no daily limits, and no watermarks on the output.
Related tools
SHA-256 Generator
Calculate SHA-256 hashes of text or files online using native WebCrypto — the standard choice for integrity checks and fingerprints. 100% client-side.
Hash Generator
Compute SHA-1, SHA-256, SHA-384, SHA-512 or MD5 hashes of text or files, right in your browser. Fast checksums for integrity checks — nothing uploaded.
MD5 Generator
Generate MD5 hashes of any text or file instantly in your browser — perfect for checksums, dedup keys and legacy integrations. One-way, never uploaded.
Base64 Encoder
Encode text to Base64 instantly with full UTF-8 support — emojis, accents and CJK characters survive intact. Free, private, nothing ever leaves your browser.
Base64 Image
Convert images to base64 data URLs and back — preview, validate and download, with an exact size comparison. Everything runs in your browser.
JSON Validator
Validate JSON instantly with precise error line and column. Catch missing commas, unquoted keys, trailing commas and bad escapes before they break your app.
JSON Formatter
Format and beautify messy JSON online — 2 spaces, 4 spaces or tabs, with instant validation and precise error locations. 100% in your browser.
URL Encoder
Percent-encode URLs and query strings online — choose component encoding or full URI encoding, with live output for links, parameters and path segments.
HTML Minifier
Minify HTML in your browser: strip comments and collapse whitespace to cut page weight — a conservative cleaner that keeps your markup and rendering intact.
URL Decoder
Decode percent-encoded URLs back into readable text — %20, %2F and query-string values become clear instantly. Handles + as space, fully in your browser.
Embed this tool
Put this tool on your own site with one line — it runs entirely in the visitor's browser.
<iframe src="https://zoyku.com/en/tools/sha1-generator?embed=1" width="100%" height="640" style="border:0;border-radius:16px" title="Zoyku — sha1-generator" loading="lazy"></iframe>