Rebuild any image as an emoji mosaic
Sample your image in a grid and map each cell to the closest emoji from a hand-picked palette of 30 colors. Output is copyable text.
image/* · runs locally · nothing uploaded
Mosaic appears here
How it works
Pick an image, tune the options, then download the result. Everything runs in your browser.
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Pick an image
Drop or select. Small, high-contrast images mosaic best.
Files stay in memory as an
HTMLImageElement— the original bytes are never uploaded, and EXIF metadata is preserved until you explicitly transform it.uploadcanvaslocaldecodeinput · bytesimage · loadedsource.png
loaded · decodedcanvas · ready - 02
Set grid width
Higher cell count = more detail but wider output.
Encoder quality is exposed where the format supports it — JPEG and WebP get a
0–1quality slider; PNG is lossless. Options re-render the canvas immediately.gridoptionslive previewencoderqualitywidth · tunable40 · livegrid: 40 wide
options applied · liveencoder · live - 03
Sample & match
Each cell averages its pixels and picks the nearest emoji color.
Pixel work runs on the Canvas 2D context —
drawImageresamples with the browser’s bilinear filter andgetImageData/putImageDataback per-pixel passes.matchrenderCanvas 2Dpreviewpx-perfectalgo · resamplednearest rgb · px-perfectdist = (dr*dr + dg*dg + db*db)
preview · livepx-perfect - 04
Copy or download
Paste into Slack, Discord, social posts, or commit messages.
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 URLok · blobready · savedmosaic.txt
shipped · ready to shipsuccess
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.
When to use this tool
Common workflows it speeds up.
Chat art
Drop a mosaic into Slack or Discord channels. 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-perfectCommit messages
Sneak a tiny mosaic into your git log. 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-tunableSocial posts
Eye-catching ascii-style content for X and Mastodon. 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-awareStatus banners
Decorate README files with emoji art. 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-safeQuick stylization
Turn screenshots into bite-sized previews. 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-sideCuriosity demos
Show off color quantization in a tactile way. 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-readyFrequently asked questions
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