Resize Image to Exact KB Size — Free & Instant

Compress JPEG, PNG & WebP to any KB size online. No upload, no registration — 100% private, works on mobile & PC.

100% Free No Upload – Private Works on Mobile Bulk Resize Exact KB Target
Selected image preview
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Drop your image here

or click to browse — JPG, PNG, WebP, HEIC supported

Drop multiple images here

Select up to 20 images — JPG, PNG, WebP

Drop image to convert

Convert between JPEG, PNG, WebP formats instantly

How to Resize Image to Specific KB Size

Upload Image

Drag and drop or click to upload JPG, PNG, or WebP.

Set Target KB

Enter desired KB size or pick a preset like Passport or WhatsApp.

Click Resize

Auto-quality algorithm hits your exact KB target.

Download

Preview before and after, then download in one click.

100% Private

Images never leave your device. All processing is in your browser — no server, no storage.

Instant Results

No queues, no waiting. Resize images in under 2 seconds directly in your browser.

Exact KB Target

Binary search algorithm finds the perfect quality to match your exact KB — not just an approximation.

Mobile Friendly

Fully responsive. Resize images from your phone or tablet without any app download.

Bulk Resize

Upload up to 20 images and compress them all to the same target KB in one go.

Smart Presets

One-click presets for Passport Photo, WhatsApp, Instagram, HD Wallpaper and more.

Frequently Asked Questions

Upload your image, type your target (e.g. 50 or 100) in the Target Size box, select KB, and click Resize and Compress. The tool uses a precision auto-quality algorithm to find the smallest file that matches your target within 3%.
Our tool uses smart quality optimization to minimize visible quality loss. You can compare the before and after preview before downloading. For most uses — web forms, WhatsApp, government uploads — the quality is excellent even at high compression.
No. Your images are processed entirely in your web browser using JavaScript. Nothing is ever sent to any server. Your photos remain 100% private and secure on your own device.
You can upload JPEG, PNG, WebP, and HEIC (iPhone photos). You can convert between JPEG, PNG, and WebP using the Convert Format tab.
Click the Passport Photo preset to set 200x200px and 50KB automatically, or enter your own dimensions and KB target. Works for Indian government forms, visa applications, and most official documents.
Yes. Click the Bulk Resize tab, upload up to 20 images, set your target KB size, and click Resize All. Download all compressed images together as a ZIP file.

Best Free Online Tool to Resize Image to Specific KB

PhotoResizerKB is the fastest free online tool to resize and compress images to an exact KB size. Whether you need to compress a JPEG to 100KB for an online form, resize a passport photo to 50KB, or reduce a PNG for your website — this tool handles it in seconds, right in your browser.

Unlike other image compressors that give approximate results, PhotoResizerKB uses a precision binary search algorithm that iterates until your image is within 3% of your target KB — giving you the highest possible quality at exactly the size you need.

Popular uses include reducing photo size for government forms (Aadhaar, PAN, visa applications), compressing images for WhatsApp, Facebook, or Instagram uploads, and optimizing website images for faster loading.

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