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Compress Image to KB Online — Reduce Photo Size Free

To compress a photo, select it, pick a target such as 20, 50 or 100 KB, and tap Compress. In our tests, two photos totalling 10.4 MB came out at 48 KB and 47 KB for a 50 KB target.

  • Free
  • No signup
  • Files never leave your device

JPG, PNG or WebP. Batch up to 30 at once.

How to compress an image to a size in KB

  1. 1Select or drop up to 30 photos into the upload box.
  2. 2Pick a target size: 10, 20, 50, 100, 200 or 500 KB, or type a custom KB value.
  3. 3Tap Compress and wait while each image is brought under the target.
  4. 4Check the new sizes and download each JPG.
About Compress Image: key facts and tips

Key facts

Documently Compress Image is a free browser tool that reduces a JPG, PNG or WebP photo to a target size in KB, from 10 KB up to 500 KB, and saves the result as a JPG. The compressor first runs a binary search on JPEG quality to find the highest quality under the target, and only then shrinks the pixel dimensions. Up to 30 images can be compressed in one batch, and every photo stays on the device, with no upload. In our tests with two phone photos totalling 10.4 MB, we measured 48 KB and 47 KB for a 50 KB target, and 9.2 KB and 8.9 KB for a 10 KB target, at about 3 seconds per batch. Results stay under the target whether a portal counts 1 KB as 1,000 or 1,024 bytes. iPhone HEIC photos are not supported yet. Check both the minimum and maximum KB on your form, then compress.

A photo straight from a phone camera is often 2–5 MB, while most application forms want it under 50 or 100 KB. This tool reduces photo size in KB to an exact target so the portal accepts it on the first try. You can compress up to 30 images in one go, and every file is processed on your own device, so nothing is uploaded.

When do you need a photo under a fixed KB size?

Online forms set strict limits because they store lakhs of uploads. Exam registrations, job applications, university admissions, scholarship forms and bank KYC all commonly ask for photos between 10 KB and 200 KB.

  • A passport-style photo for a recruitment or admission form that must be under 50 KB.
  • Scanned ID cards, caste certificates or fee receipts saved as JPG for a portal.
  • Product or document photos you need to send quickly on a slow 4G connection.

How the tool hits an exact KB target

First it searches for the highest JPEG quality that still fits under your target, testing settings in a binary search instead of guessing. Only if the lowest sensible quality is still too large does it reduce the pixel dimensions, so your photo keeps as much detail as possible.

The output is always JPG. Results are kept under the target whether a portal counts 1 KB as 1000 bytes or 1024 bytes, so a 50 KB file here is at most 50,000 bytes and will pass either check.

Common mistakes that get photos rejected

  • Going too small: many portals also have a minimum, such as 10 or 20 KB. Check both limits before you compress.
  • Starting from a WhatsApp-forwarded image: WhatsApp already recompresses photos, so they turn blurry faster. Use the original from your gallery.
  • Very low targets for large photos: JPEG quality below about 40 shows visible blocky patches. For 10–20 KB, crop to just the face or document first.
  • Uploading HEIC from an iPhone: it is not supported yet. Change Settings → Camera → Formats → Most Compatible, or take a screenshot of the photo and use that.
  • Wrong dimensions: if the form also asks for exact pixels, use Resize Image or the exam photo tool instead.

Is it private? How it works on your phone

Compression uses your browser's built-in image engine, so the photos are decoded, re-encoded and saved on your own phone or computer. They are never uploaded to any server.

That also makes it fast on a weak signal, because only the page loads over the internet, not your files. We record only anonymous usage counts like the tool used and file size.

Frequently asked questions

How do I reduce photo size to 50 KB?

Select your photo, tap the 50 KB target and tap Compress. The tool finds the best JPEG quality that fits under 50 KB and reduces dimensions only if necessary. The result is a JPG ready for upload, created in your browser without sending the photo anywhere.

Can I compress a photo to 20 KB without losing clarity?

Usually yes for a passport-style photo, because a face crop needs few pixels. For a full phone photo, 20 KB means real detail loss. Crop the image to just the face or document first, then compress, and the result will look much sharper.

Why does the portal say my file is too large when it shows 50 KB?

Some systems count 1 KB as 1024 bytes and others as 1000. A file shown as 50 KB on one device may be 51 KB elsewhere. Files made here stay under the target in both counts, so they pass either rule.

Does it work with iPhone HEIC photos?

Not yet. On your iPhone, go to Settings → Camera → Formats and choose Most Compatible so new photos save as JPG. For an existing HEIC photo, take a screenshot of it and compress the screenshot instead.

Can I compress many photos at once?

Yes, you can add up to 30 images in one batch. All of them are compressed to the same target size, and you can download each JPG. Everything runs on your device, so large batches may take a little longer on older phones.

Is the image compressor free and without watermark?

Yes. It is completely free, needs no signup or login, and adds no watermark or logo to your photos. The files never leave your device, so there is nothing for us to keep or delete afterwards.

Last updated 31 October 2026. Questions or a spec that changed? hello@documently.in