xxHash128 (XXH128) is xxHash3's 128-bit output: the same 2019 algorithm by Yann Collet producing 16 bytes, 32 hex characters, for uses where a 64-bit value would eventually collide by chance. On long inputs it costs almost nothing over the 64-bit form.

No, and it does not try to be. xxHash is a non-cryptographic hash: it has excellent distribution and passes the SMHasher test suite, but anyone who knows the algorithm can make two inputs collide. Use it for hash tables, checksums and deduplication; use SHA-256 or BLAKE3 when an attacker might choose the input.

Why 128 bits for a non-cryptographic hash?

By the birthday bound, a 64-bit hash sees a random collision after about four billion items, which a large deduplication index or content store can reach; at 128 bits the expected count is 18 quintillion, which it cannot. That is the whole case for the longer output.

What seed does the tool use?

The tool uses seed 0, the reference implementation's default and what xxhsum prints. A different seed gives a completely different hash, which is how a hash table can defend against crafted collisions; if a system you compare against seeds its xxHash, its values will not match these.

Where is xxHash128 used?

Deduplication and content-addressed storage of trusted data, distributed hash tables, change detection across very large datasets, and as a cheaper MD5 replacement where nobody can choose the inputs. Where an attacker could, use BLAKE3 or SHA-256 instead.

Is my file uploaded anywhere?

Nothing leaves your browser. The file is read on your machine and hashed there, by the browser's Web Crypto API or a WebAssembly build of xxHash128 loaded on first use; the page makes no request with its bytes. You can load the page, go offline and keep hashing.

How do I hash a file?

Drop the file onto the pane or choose it with the button. It is read into memory and hashed at once, with no size steps and no upload progress because there is no upload. Files up to 1 GB work; a 100 MB file takes well under a second on xxHash128.

How do I verify a download's xxHash128 checksum?

Paste the checksum the publisher gave you into the Verify field, in hex of either case, with or without spaces, colons or a 0x prefix, or in Base64. The tool says whether it matches the file you dropped. A match means the bytes are exactly the ones that were published.

What formats can I copy or download?

Hex by default, 32 characters; Base64 and Base64url are one click away and re-encode the same 16 bytes. The download button saves a line in the `checksum filename` form that sha256sum-style tools read.

File to xxHash128.

Drop a file and read its xxHash128 checksum at once, in your browser. xxHash128 is xxHash3's 128-bit output, for deduplication and content stores where 64 bits would eventually collide; the file is read on your machine and never uploaded.128 bits1 GB max file2019 published0 bytes uploaded

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How it works

4 steps, no account. It runs in your browser and nothing is uploaded.

Drop a file
Drop it onto the pane or choose it with the button; anything up to 1 GB is read in your browser.
Read the checksum
The xxHash128 checksum appears at once, as hex, Base64 or Base64url; switch to xxHash32, xxHash64 and xxHash3 in the bar.
Verify against a published checksum
Paste the checksum the publisher lists and the tool says whether the file matches.
Copy or download
Copy the checksum, or download it as a line a checksum tool can read.

Nearby in the hash generators. Every one free, in the browser.

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For personal projects & open source

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Complete multi-page sites you can ship as they are.Templates: All 14 templates
React icons from every major library, installable with one command.React icons: 294k+ icons
Presets that restyle every block, in light and dark.Themes: All 59 themes
Lets your AI editor search, preview and install blocks for you.MCP server: Basic usage
Priority requests are answered first.Support: Standard

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For companies with larger teams

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File to xxHash128.