Lumagely
English

Compress an image to 100 KB

Need a photo under 100 KB for a form or upload? Set the target and Lumagely automatically finds the highest quality that fits — 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

Many forms and portals cap uploads at 100 KB. Instead of guessing quality settings, Lumagely’s Target file size mode searches for the best JPEG, WebP or AVIF quality that lands under your limit — automatically, on your device.

How to compress an image to 100 KB

  1. 1Drop your image in — the target is already set to 100 KB.
  2. 2Adjust the limit if you need a different size, and pick the output format.
  3. 3Download the compressed image, or a ZIP of the batch.

Good to know

  • Works with JPEG, WebP and AVIF — the quality is chosen for you.
  • If even the lowest quality is too big, also resize the image down.
  • Set any KB target, not just 100.

Compress to 100 KB — questions

How do I get an image exactly under 100 KB?

Target file size mode tries qualities until the output fits under your KB limit, so you don’t have to guess.

What if it can’t reach 100 KB?

Very large images may not fit by quality alone — reduce the dimensions with the resize option and it will get there.

Which formats work with a target size?

JPEG, WebP and AVIF, since their quality can be tuned to hit a size.

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.