Convert JPG to PNG losslessly
Re-encode any JPEG as a lossless PNG with an alpha channel. Everything runs in your browser — no uploads.
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 JPG
Drop or select a JPEG file. It stays on your device.
Files stay in memory as an
HTMLImageElement— the original bytes are never uploaded, and EXIF metadata is preserved until you explicitly transform it.uploadcanvaslocaldecodeinput · bytesjpg · loadedphoto.jpg
loaded · decodedcanvas · ready - 02
Auto re-encode
The browser decodes JPEG and re-encodes pixel data as lossless PNG.
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.decodeoptionslive previewencoderqualityconvert · tunablepng · livecanvas.toBlob("image/png")options applied · liveencoder · live - 03
Compare sizes
PNG is usually larger than JPEG for photos — it preserves every pixel exactly.
Pixel work runs on the Canvas 2D context —
drawImageresamples with the browser’s bilinear filter andgetImageData/putImageDataback per-pixel passes.sizerenderCanvas 2Dpreviewpx-perfectsize · resampleddelta · px-perfectjpg < png (lossless)
preview · livepx-perfect - 04
Download PNG
Save the PNG. Useful when you need an alpha-capable container.
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.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.
Editing pipeline
PNG is the safe handoff format for further lossless edits. 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-perfectCompatibility
Some tools refuse JPEGs but accept PNG. 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-tunableAdd transparency later
PNG carries an alpha channel JPEG can't. 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-awareAvoid generational loss
Stop further JPEG re-encoding from degrading quality. 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 snapshots
Keep one lossless copy alongside JPEG masters. 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-sideDocumentation
PNG is the de facto format for screenshots and docs. 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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