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identicon · hash · avatar · local

Generate symmetric identicons from any string

GitHub-style 5x5 identicons derived deterministically from an input string. Same input always produces the same icon. Runs locally.

Identicon Generator
Size
240px
square
Color
hsl(174, 64%, 45%)
hsl
Grid
5x5
symmetric
Status
ready
live
input · image
Username or email
Size: 240px
Symmetric 5x5 grid derived from an FNV-1a hash of the input. Hash drives both the cell pattern and the HSL color.
output · preview
Quick Start

How it works

Pick an image, tune the options, then download the result. Everything runs in your browser.

  1. 01

    Pick a seed

    Type any username, email, or arbitrary string. The same input always produces the same icon.

    Files stay in memory as an HTMLImageElement — the original bytes are never uploaded, and EXIF metadata is preserved until you explicitly transform it.

    seeduploadcanvaslocaldecode
    seed · bytesoctocat · loaded
    fnv1a("octocat")
    loaded · decodedcanvas · ready
  2. 02

    Derive grid

    The first hash bytes pick which of the 5x5 cells are filled. Left-right symmetry is enforced.

    Encoder quality is exposed where the format supports it — JPEG and WebP get a 0–1 quality slider; PNG is lossless. Options re-render the canvas immediately.

    gridoptionslive previewencoderquality
    grid · tunable5x5 · live
    bits → cells (mirrored)
    options applied · liveencoder · live
  3. 03

    Derive color

    Hue, saturation, and lightness come from later hash bytes, giving a stable HSL color per seed.

    Pixel work runs on the Canvas 2D context — drawImage resamples with the browser’s bilinear filter and getImageData/putImageData back per-pixel passes.

    colorrenderCanvas 2Dpreviewpx-perfect
    color · resampledhsl(174, 64%, 45%) · px-perfect
    hsl(h, s, l)
    preview · livepx-perfect
  4. 04

    Download PNG

    Save as a transparent-safe PNG ready for default avatars and chat bubbles.

    Downloads ship via a hidden anchor with an object URL — no server round-trip, and the file on disk is untouched. The output filename inherits a sensible suffix.

    exportdownloadblobclient-sideobject URL
    ok · blobready · saved
    identicon.png
    shipped · ready to shipsuccess
Pro tips

Browser-only image work that scales

Convert with quality control

JPEG/WebP let you pick a 0–1 quality. Default 0.92 is a good compromise of size and visible quality.

PNG isn’t free

Use PNG only for transparency or sharp edges. For photos, WebP is smaller at the same perceived quality.

Strip EXIF for privacy

Photo EXIF often contains GPS, camera model, and timestamps. Strip before sharing public uploads.

Watch the colour profile

Convert to sRGB before web export. Wide-gamut images render oversaturated in non-managed browsers.

AVIF when it’s available

AVIF beats WebP on size at the same quality. Detect support via <picture> with fallbacks.

Lazy-load below the fold

Add loading="lazy" on <img>. The browser handles scheduling — no IntersectionObserver needed.

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Use Cases

When to use this tool

Common workflows it speeds up.

Default avatars

Show a stable icon before users upload a photo. Decoded into a Canvas 2D context — original bytes never leave the tab, so you can process customer-uploaded photos, internal screenshots, or sensitive diagrams without privacy concerns.

px-perfect

Forum threads

Per-username badges that never collide visually. Encoders expose quality 0–1 where the format supports it (JPEG, WebP); PNG and AVIF stay perceptually lossless. Pick 0.85 for web, 0.95 for archival, 0.7 for thumbnails.

quality-tunable

Comment systems

Anonymous-but-distinct icons next to each comment. Pair with the EXIF Stripper before sharing user-uploaded photos publicly. Camera serial numbers, GPS coordinates, and timestamps often hide in image metadata and leak more than the picture itself.

format-aware

Git platform UIs

Same-input/same-image avatars for repos and PRs. Output preserves colour profile (sRGB) so it renders consistently across browsers, monitors, and print pipelines. Wide-gamut workflows can opt into Display P3 for modern Apple devices.

EXIF-safe

Empty states

Visual diversity in lists awaiting real data. Re-runs only on option changes, never on window resize, so the canvas stays responsive on large images. drawImage uses the browser's bilinear filter for fast resampling.

client-side

Multiplayer rooms

Quick visual cue per player without sign-in art. Downloads as .png, .jpg, .webp, or .avif with the correct MIME so editors apply native handling on save. The filename inherits a sensible suffix derived from the input.

compression-ready
FAQ

Frequently asked questions

Yes. The same string always produces the same image — useful for stable avatars without user uploads.
A simple FNV-1a 32-bit hash, expanded into more bytes to drive both the cell pattern and the HSL color.
It's the same layout GitHub uses — feels balanced and reads well at 32-64 px.
The light-gray background ships baked in; download and recolor it elsewhere if needed.
No. Everything runs locally in your browser.
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