BYTETOOLS

Compress Image to Size (KB)

Compress a JPG, PNG or WebP to an exact file size in KB — 20KB, 50KB, 100KB, 200KB presets for online forms. Free and 100% in-browser.

Drop an image to compress to a target sizeCompressed locally — never uploaded

What is the Compress Image to Size (KB)?

The ByteTools image size compressor squeezes a photo under an exact kilobyte limit — the kind demanded by exam applications, government portals, job forms and upload fields that reject anything over 20 KB, 50 KB, 100 KB or 200 KB.

  • Hits an exact KB target automatically — no manual slider guessing
  • Presets for 20, 50, 100, 200 and 500 KB form limits
  • Automatic quality search plus optional downscaling
  • JPEG or WebP output from any input format
  • Shows final size, quality used and dimensions
  • 100% private — photos never leave your browser

How to use the Compress Image to Size (KB)

  1. 1

    Drop an image into the upload area.

  2. 2

    Enter a target size in KB, or tap a preset like 50 KB or 100 KB.

  3. 3

    Choose JPEG or WebP output and whether downscaling is allowed.

  4. 4

    Click Compress and download the file that fits your limit.

About the Compress Image to Size (KB)

The ByteTools image size compressor squeezes a photo under an exact kilobyte limit — the kind demanded by exam applications, government portals, job forms and upload fields that reject anything over 20 KB, 50 KB, 100 KB or 200 KB. Type any target or tap a preset, and the tool does the tuning for you.

Under the hood it binary-searches the JPEG or WebP quality setting, re-encoding the image repeatedly until the output lands just under your limit. If even the lowest quality is too large, it can progressively scale the image down as well, so you always get a file that fits.

Every re-encode runs 100% locally in your browser — your photo is never uploaded. That matters, because the documents this tool is usually used for (IDs, signatures, certificates) are exactly the ones you should not send to a random server.

Frequently asked questions

How do I compress an image to exactly 50 KB?

Upload the image, tap the 50 KB preset and click Compress. The tool repeatedly re-encodes the photo at different quality levels until the file lands just under 50 KB, then lets you download it. No trial-and-error with sliders needed.

Why do exam and government forms limit images to 20–200 KB?

Their servers process millions of applications, so they cap uploads to keep storage and bandwidth manageable. The limits are strict — a file even 1 KB over is rejected — which is why targeting an exact size beats using a generic quality slider.

Will compressing to a small size ruin my photo?

Quality drops as the target shrinks, but the tool always uses the highest quality that fits your limit. A passport-style photo compresses to 50 KB with little visible change; pushing a large detailed photo under 20 KB will show visible softening unless downscaling is enabled.

Should I choose JPEG or WebP output?

WebP is roughly 25–30% more efficient, so it keeps more quality at the same KB target. Choose JPEG when the form or website explicitly requires a .jpg file — many government portals do — and WebP when the uploader accepts it.

What if the image cannot reach my target size?

Enable 'Allow downscaling' and the tool will reduce the pixel dimensions step by step until the target is reachable. With it disabled, the tool returns the smallest file it could make and tells you the target was missed.

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