Re-encode JPEG quality precisely
Re-encode any JPEG at the exact quality you choose. Compare before/after sizes side-by-side. Runs entirely locally.
image/jpeg · 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 a JPEG
Drop or select any .jpg/.jpeg.
Files stay in memory as an
HTMLImageElement— the original bytes are never uploaded, and EXIF metadata is preserved until you explicitly transform it.uploadcanvaslocaldecodeinput · bytesjpeg · loadedphoto.jpg
loaded · decodedcanvas · ready - 02
Slide quality
Pick anywhere from 5% to 100%. The encoder re-processes as you drag.
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.qualityoptionslive previewencoderq · tunable0.75 · liveencode(q=0.75)
options applied · liveencoder · live - 03
Compare sizes
Spot the savings before you commit. Aggressive quality drops add artifacts.
Pixel work runs on the Canvas 2D context —
drawImageresamples with the browser’s bilinear filter andgetImageData/putImageDataback per-pixel passes.deltarenderCanvas 2Dpreviewpx-perfectsaved · resampled0% · px-perfect0 B -> 0 B
preview · livepx-perfect - 04
Download JPG
Save the re-encoded image. Filename carries the chosen quality.
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 · savedphoto-q75.jpg
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.
Web optimization
Cut photo size for faster loads. 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-perfectEmail attachments
Stay under attachment limits. 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-tunableStandard quality
Normalize a folder to one consistent Q value. 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-awareComparison testing
See how different qualities affect detail. 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-safeArchival downsize
Smaller photo archives for backup. 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-sideMobile-friendly
Lighter photos for mobile data. 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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