Resize many images with one rule
Drop in a batch and resize them all by exact pixels or percentage. Aspect-fit option avoids stretched outputs. Runs entirely in your browser.
image/* · runs locally · nothing uploaded
How it works
Pick an image, tune the options, then download the result. Everything runs in your browser.
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Pick images
Drop in many files at once. Each is loaded into memory for processing.
Files stay in memory as an
HTMLImageElement— the original bytes are never uploaded, and EXIF metadata is preserved until you explicitly transform it.uploadcanvaslocaldecodeinput · bytes0 · loadedfiles.length 0
loaded · decodedcanvas · ready - 02
Pick a rule
Exact pixels (with fit-aspect option) or a percentage of each source.
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.ruleoptionslive previewencoderqualitymode · tunable800×600 · liveMath.min(w/iw, h/ih)
options applied · liveencoder · live - 03
Resize all
Each file is decoded, drawn at the new size, and re-encoded.
Pixel work runs on the Canvas 2D context —
drawImageresamples with the browser’s bilinear filter andgetImageData/putImageDataback per-pixel passes.runrenderCanvas 2Dpreviewpx-perfectformat · resampledpng · px-perfectdrawImage(im, 0, 0, tw, th)
preview · livepx-perfect - 04
Download
Grab individual files or download all once the batch finishes.
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 · savedname-resized.png
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.
Hero image prep
Standardize blog photos to one width. 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-perfectProduct catalog
Pre-size every shot to thumbnail. 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-tunableDesign exports
Match Figma exports to build constraints. 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-awareApp asset packaging
Resize sprite atlases in one pass. 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 uniformity
No CLI tool or build step needed. 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-sideSocial posting
Resize multi-photo posts before upload. 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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