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Identicon Generator

Generate unique identicon avatars from any text or email address using GitHub-style symmetric grid patterns.

About Identicon Generator

The Identicon Generator creates unique, deterministic avatar images from any input text — usernames, email addresses, UUIDs, or arbitrary strings. The input is hashed (using SHA-256) and the hash is used to determine a symmetric 5×5 pixel grid pattern and color, producing a visually distinct but reproducible avatar for any given input. The same input always generates the same identicon. Identicons are widely used as default profile images where no photo has been set — GitHub uses them as default user avatars. The generated identicon can be downloaded as a PNG at any size, or copied as a data URL for direct use in HTML or CSS.

Why use Identicon Generator

  • Deterministic — the same input always generates the same avatar.
  • SHA-256 hash ensures visually distinct icons for similar inputs.
  • Downloadable PNG at multiple resolutions.
  • No external service — generated entirely in your browser.
  • Deterministic — the same input always produces the same identicon, so users see a consistent avatar across sessions.
  • SHA-256 hashing ensures even similar inputs (alice, alice2) produce visually distinct icons.

How to use Identicon Generator

  1. Enter any text, username, or email address in the input field.
  2. The identicon is generated and displayed instantly.
  3. Adjust the size (pixels) using the size selector.
  4. Click Download PNG or Copy Data URL to use the identicon.
  5. Enter any text — a username, email address, UUID, or arbitrary string — in the input field.
  6. The identicon updates in real-time as you type; the SHA-256 hash and resulting 5×5 grid pattern change with each character.
  7. Adjust the size selector to choose the output resolution — common values are 64, 128, 256, and 512 pixels.

When to use Identicon Generator

  • Generating default profile avatars for user accounts in web apps.
  • Creating unique visual identifiers for entities in a data dashboard.
  • Generating identicons for test user profiles in development.
  • Creating visual hash representations of strings or UUIDs.
  • Generating default profile avatars for user accounts in web apps where users haven't uploaded a photo.
  • Creating unique visual identifiers for entities (organizations, repos, machines) in a data dashboard.

Examples

Username identicon

Input: alice

Output: Symmetric 5×5 grid identicon, color derived from SHA-256 hash of 'alice' — same image every time.

Email identicon (Gravatar style)

Input: user@example.com (lowercased, trimmed)

Output: Deterministic identicon used as default avatar when no Gravatar exists.

UUID identicon

Input: 550e8400-e29b-41d4-a716-446655440000

Output: Visual fingerprint for the UUID — useful for opaque entity identifiers in dashboards.

Bulk usernames

Input: alice, bob, carol (3 inputs)

Output: ZIP file with 3 PNG identicons (alice.png, bob.png, carol.png) at 256×256.

Tips

  • For email-based identicons, hash the lowercased trimmed email — that matches the Gravatar convention and ensures consistency.
  • Keep the saturation moderate (60-80%) so the identicon has color personality but doesn't visually clash with your UI.
  • If you need higher resolution than 512px, prefer SVG download — it stays sharp at any zoom level.
  • When showing many identicons in a list, use a smaller grid (5×5) and 32-64px size to avoid visual noise.
  • Cache generated identicons by input hash — recomputing SHA-256 on every render wastes CPU on large user lists.
  • Don't rely on identicons as a security cue — different inputs can rarely produce visually similar icons by chance.
  • Use base64 data URLs in static HTML for offline-first apps; the icon is embedded directly without an extra HTTP request.

Frequently Asked Questions

Is the same input guaranteed to always produce the same identicon?▾
Yes. The identicon is derived deterministically from the SHA-256 hash of the input text, so the same string always produces the same pattern and color.
What algorithm does GitHub use?▾
GitHub uses a similar 5×5 symmetric grid approach based on the hash of the user's email address. This tool follows the same general approach.
Can I use identicons as profile pictures?▾
Yes. Identicons are designed as default profile images. They are visually unique enough to help users identify each other in lists.
What size should I download?▾
128×128 px is standard for profile images. 512×512 is good for high-resolution displays. The SVG/PNG is scaled from the underlying 5×5 grid so any size renders cleanly.
Does the color change between different inputs?▾
Yes. The hue and saturation of the identicon color are derived from the hash, so different inputs produce different colors as well as different grid patterns.

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Glossary

Identicon
A small, hash-based image used as a default avatar. Coined by Don Park in 2007. The output is deterministic from the input, making it a visual fingerprint.
SHA-256
A 256-bit cryptographic hash function from the SHA-2 family. Given any input, it produces a fixed-length 32-byte digest. It is deterministic, fast in JavaScript via SubtleCrypto, and collision-resistant.
Deterministic generation
A property where the same input always produces the same output. Identicons rely on this so a user's avatar is stable across visits without needing server-side storage.
Color seed
The portion of the input hash used to derive the avatar's primary color. Typically the first or last few bits of the hash are mapped into HSL hue, saturation, and lightness.
HSL
Hue-Saturation-Lightness — a cylindrical color model where hue is an angle (0-360°), and saturation and lightness are percentages. Friendlier for procedural color generation than RGB.
Symmetric grid
A pattern where the right half mirrors the left half (and sometimes the bottom mirrors the top). Symmetry makes hash-derived patterns more visually pleasing as avatars.
SVG vs PNG
SVG is a vector format that scales infinitely without aliasing. PNG is a raster format with fixed pixel dimensions. SVG is ideal for identicons because the underlying 5×5 grid renders crisply at any scale.
Data URL
A URL scheme (data:image/png;base64,...) that embeds a file's contents directly into the URL. Useful for inlining identicons into HTML without separate HTTP requests.