Lumagely
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Compress an image to 20 KB

Shrink a photo, signature or document scan under 20 KB for an online application form. Set the target and Lumagely does the rest.

  • Nothing uploaded, all on your device
  • Fast WebAssembly 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

Exam registrations, job portals and government forms often cap photo and signature uploads at 20 KB. That’s tiny when a typical phone photo is several megabytes, so Lumagely pairs its Target file size search with resizing. It finds the highest JPEG quality that fits under your limit, and you can scale the dimensions down when quality alone isn’t enough. Everything happens on your device, so personal documents stay private.

How to compress an image to 20 KB

  1. 1Drop your photo, signature or scan in. The target is preset to 20 KB and the output to JPG.
  2. 2For a phone photo, also turn on Resize and set a width of a few hundred pixels.
  3. 3Download the result and check its size before you upload it to the form.

Good to know

  • Most application forms ask for JPG, so JPG is preselected. Switch to WebP or AVIF if the form accepts them.
  • Signatures and passport-style photos fit in 20 KB easily once resized.
  • Your documents never leave your device, which matters for ID photos and signatures.

Compress to 20 KB: common questions

How do I reduce a photo to 20 KB for an online form?

Open the photo here (the 20 KB target is already set), turn on Resize if it’s a large phone photo, and download. Lumagely picks the best quality that fits under 20 KB automatically.

Why can’t my image reach 20 KB?

A large photo can’t shrink that far by quality alone. Reduce its dimensions with Resize. For a 20 KB limit, a width of a few hundred pixels is usually enough.

Will the photo still be clear?

For passport-size photos and signatures, yes. The quality search keeps as much detail as the 20 KB limit allows.

Is it safe to compress ID photos and signatures here?

Yes. Everything is processed in your browser, and nothing is uploaded to a server.

See also: Compress to 50 KB, Resize Image and Compress JPEG

Everything you can do

Compression, format conversion, resizing, cropping and watermarks, all in one tool that runs in your browser.

  • Smart compression

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

  • Target file size

    Enter a limit in KB and Lumagely finds the best quality that fits. Handy for upload caps and email attachments.

  • Convert & HEIC to JPG

    Convert between PNG, JPEG, WebP and AVIF, turn iPhone HEIC photos into JPG, and move old GIFs to a modern format.

  • Resize, crop & rotate

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

  • Batch watermark

    Stamp a text or logo watermark on every image and set its position, size, opacity and margin.

  • Private & offline

    Images are processed on your device in Web Workers, with no sign-up. Once the page and a format’s codec have loaded, they keep working offline.

Supported formats

The formats the modern web runs on, plus iPhone HEIC.

  • 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 and graphics, lossy or lossless.

  • AVIF

    Modern 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 a server.

Fast

WebAssembly builds of MozJPEG, OxiPNG, libwebp and libavif run at near-native speed in your browser.

Free, no limits

No sign-up, no forced watermarks and no cap on how many images you optimize.

No ads, no tracking

There are no ads, analytics or tracking cookies. The page’s security policy blocks connections to any other server, so no third party ever receives your images.

Location data removed

Phone photos often carry GPS coordinates. Strip metadata (EXIF) is on by default, so the files you download don’t reveal where a photo was taken.

Check it yourself

Open your browser’s developer tools while converting: the Network tab shows that no image is sent anywhere.

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
  • Free plans often limit how many or how large your files can be
  • Often ad-supported, with third-party trackers
  • Every file waits for an upload and a download

Lumagely

  • Images stay on your device
  • No sign-up, no account
  • Compression, conversion, resizing and social sizes in one place
  • Private by design: nothing leaves your browser
  • No limit on the number of files, up to 256MB each
  • No ads, no analytics, no tracking cookies
  • Nothing to upload, so work starts as soon as you add a file

More image tools

Each tool opens Lumagely already set up for one common job.