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Compress JPEG images

Make JPG and JPEG photos smaller without visibly losing quality, using the MozJPEG codec — right in your browser.

  • No uploads — 100% on-device
  • Fast in-browser processing · WASM codecs
  • Unlimited files · up to 256MB each

Drop images here

or Browse files

Tip: paste images directly with Ctrl+V

HEIC · PNG · JPEG · WebP · AVIF · GIF · SVG

Lumagely compresses JPEGs with MozJPEG, the encoder trusted by performance engineers, finding the sweet spot between size and quality. Adjust the quality, or switch to Target file size to hit an exact KB limit — all on your device.

How to compress JPEG images

  1. 1Drop your JPG/JPEG files in.
  2. 2Tune the quality slider, or pick Target file size for an exact limit.
  3. 3Download each compressed JPG, or the batch as a ZIP.

Good to know

  • MozJPEG typically saves 30–60% versus a camera or phone JPEG.
  • Use Target file size mode to fit upload or email limits.
  • Stripping metadata is on by default to save even more.

Compress JPEG — questions

Does compressing a JPEG reduce quality?

Slightly, but at the default quality it’s invisible. Lower the quality for smaller files, or raise it to stay closer to the original.

How small can I make a JPEG?

Use Target file size mode and set a KB limit — Lumagely finds the highest quality that fits.

Can I compress many JPEGs at once?

Yes. Add a batch, compress them together and download everything as a ZIP.

Everything you can do

A complete image toolkit — compress, convert, resize, crop, rotate and watermark — all running privately in your browser.

  • Smart compression

    Shrink PNG, JPEG, WebP and AVIF with WebAssembly codecs — Smart Auto, lossy, near-lossless or fully lossless.

  • Target file size

    Set a limit in KB and Lumagely finds the best quality that fits — ideal for upload caps and email attachments.

  • Convert & HEIC to JPG

    Convert between PNG, JPEG, WebP and AVIF, turn iPhone HEIC photos into JPG, and modernize old GIFs.

  • Resize, crop & rotate

    Resize by pixels or percentage, crop to any aspect ratio, and rotate or flip — across the whole batch.

  • Batch watermark

    Stamp a text or logo watermark onto every image, with full control over position, size, opacity and margin.

  • Private & offline

    Everything runs on your device in Web Workers — no uploads, no sign-up, and it keeps working offline.

Supported formats

Compress, convert and optimize the formats the modern web runs on.

  • HEIC

    Convert iPhone HEIC photos to JPG, PNG, WebP or AVIF.

  • PNG

    Lossless compression with OxiPNG.

  • JPEG

    High-quality photos with MozJPEG.

  • WebP

    Smaller photos & graphics, lossy or lossless.

  • AVIF

    Next-gen format with the best compression for photos.

  • SVG

    Minify vectors, or trace raster images into SVG.

  • GIF

    Convert GIFs to modern, smaller formats.

Why Lumagely?

100% private

Your images are processed on your device and never uploaded to any server.

Fast & modern

WebAssembly codecs (MozJPEG, OxiPNG, libwebp, libavif) run at near-native speed in your browser.

Free & unlimited

No sign-up, no forced watermarks, no limits — optimize as many images as you like.

Browser-based vs. upload-based

Typical upload tools

  • Images are uploaded to a server
  • Sign-up or usage limits are common
  • Often split across separate tools
  • Privacy depends on the provider

Lumagely

  • Images stay on your device
  • No sign-up — unlimited files
  • Compress, convert, resize and social export in one place
  • Private by design — nothing leaves your browser

More image tools

One-tap tools for the most common image jobs — all free, all in your browser.