1. Upload Your Image
Drag and drop any JPG, PNG, WebP, AVIF, GIF, or BMP file into the drop zone, or click to browse your files. Supports images up to 50MB with full EXIF orientation support.
Compress Images in Your Browser
Free, fast, and completely private. No uploads. No servers. Your images never leave your device. Compress JPG, PNG, WebP, AVIF to any target size from 20KB to 500KB.
Which Target Size Do I Need?
A quick map from real-world government exams, portals, and web use-cases to the right compression target. Each row links to a dedicated tool pre-set to that size.
| Target Size | Typical Use Case |
|---|---|
| 20KB | SSC / IBPS signature uploads |
| 50KB | SSC / IBPS photograph, ICAI photo & signature |
| 75KB | NEET / India Post GDS photo, JEE Main / UPSC signature |
| 100KB | JEE Main signature, India Post GDS photo, UPSC signature |
| 125–175KB | NEET / UPSC / JEE Main photo (mid-range), blog thumbnails |
| 200KB | UPSC / NEET / JEE Main photograph (upper limit), website hero images |
| 225–250KB | New Indian Passport Seva digital photograph (10–250KB, 2026 standard) |
| 275–300KB | Older passport photo guidance, marketplace & e-commerce listings |
| 350–500KB | Certificate/document scans, photography portfolios, large web banners |
Specifications are based on published exam/portal notifications researched at the time of writing and can change between application cycles — always confirm against your specific exam's current official notification before submitting.
Compress to a Specific Size
Choose your exact target file size and compress images with precision. Our intelligent algorithm optimizes quality and dimensions automatically.
How It Works
Four simple steps to compress your images without compromising privacy. All processing happens locally in your browser.
2. Choose Target Size
Select your desired output size from 20KB to 500KB. Our intelligent binary search algorithm automatically adjusts quality and dimensions to reach your target precisely.
3. Compress
Click the Compress button. Our binary search quality optimization finds the best quality setting for your target size in milliseconds, right in your browser. No uploads required.
4. Download
Preview the before and after results, then download your compressed image instantly. Compare file sizes, dimensions, compression percentage, and output format at a glance.
Supported Image Formats
Our compressor works with all major image formats and intelligently selects the best output format for your needs.
JPG / JPEG
The most common photo format. Excellent compression for photographs with rich colors. Our tool optimizes quality settings to reach your target size while preserving visual fidelity.
PNG
Lossless format with full transparency support. Ideal for screenshots, graphics, logos, and images with text. We preserve transparency when compressing PNG files automatically.
WebP
Modern format from Google offering superior compression. WebP typically produces files 25-35% smaller than JPEG at equivalent quality. We auto-convert when your browser supports it.
AVIF
The next-generation format with the best compression ratios. AVIF can reduce file sizes by 50% compared to JPEG. Automatically used for very small target sizes when your browser supports it.
Your Privacy Matters
Unlike most online image compressors, we never upload your images to a server. All compression happens locally in your browser.
Every image you compress using Compress To KB is processed entirely within your web browser using JavaScript and the HTML5 Canvas API. This means your images are never sent over the internet, never stored on any remote server, and cannot be accessed by us or any third party. Compressed images exist only in your browser's memory and are discarded when you close the page.
This makes Compress To KB ideal for compressing sensitive photos, confidential documents, or any image you prefer to keep private. Your data stays on your device, exactly where it belongs. Once the page is loaded, you can even compress images without an internet connection.
From Our Blog
Guides on formats, privacy and web performance to help you compress smarter.
JPEG vs WebP vs AVIF: Which Format Should You Use in 2026?
A practical comparison of compression ratio, browser support and visual quality.
Compressing Images for Government Portals & Exams
The exact settings for SSC, UPSC and IBPS photo and signature uploads.
The Privacy Risks of Online Image Converters
Why browser-based compression keeps your photos off someone else’s server.
Image Size, Core Web Vitals and Mobile SEO
How image weight affects LCP, load time and search rankings.
Optimizing E-Commerce Product Images for Sales
Matching target sizes to thumbnails, main images and zoom views.
Lossy vs Lossless Compression Explained
When to sacrifice pixels and when to preserve every bit.
Frequently Asked Questions
It depends entirely on the exam. SSC and IBPS typically cap photographs at 50KB and signatures at 20KB. UPSC, NEET, and JEE Main allow photographs up to 200KB. The new Indian passport standard allows up to 250KB. Check the table above or your exam's official notification for the exact number, then open that specific tool page — each one is pre-set to the right target.
Yes, and fairly often. NTA, for instance, has changed the JEE Main photograph ceiling between 200KB and 300KB across different cycles, and India's passport photo standard changed significantly in late 2025. This site's tables reflect our research at the time of writing — always cross-check with the current official notification before submitting any form.
No. Compress To KB is an independent tool and is not affiliated with, endorsed by, or connected to any government body, exam authority, or portal mentioned on this site. All exam and portal names are referenced solely to help you choose the correct compression target.
Because compression happens entirely inside your browser using the HTML5 Canvas API, there's no server in the loop at all — which matters a lot when the image is a personal photo, ID document, or signature. Read our full Privacy Policy for the technical details.
Yes, Compress To KB is completely free with no sign-up, no account, and no watermark on your downloaded image. There are no hidden limits on how many times you can use it.
You can upload JPG, PNG, WebP, AVIF, GIF, or BMP files. For output, choose Auto to let the tool pick the best format for your target size, or force a specific format — JPG, PNG, WebP, or AVIF — from the Output Format dropdown.
Not currently — each tool page processes one image at a time so it can fully dedicate its compression search to that single file. You can immediately reset and run another image right after downloading, with no limit on repeat uses.
Not directly. Our supported input formats are JPG, PNG, WebP, AVIF, GIF, and BMP, which doesn't include Apple's HEIC format. Many iPhones convert HEIC to JPG automatically during a browser upload; if yours doesn't, switch to Settings → Camera → Formats → "Most Compatible" to save new photos as JPG.
Yes. Every tool on this site is built to work the same way on a phone's browser as on desktop — tap to browse your photo library or take a new picture, then compress and download directly to your device, with no app to install.
We use 1KB = 1,024 bytes, the standard binary definition used by Windows, macOS, and most software. A small number of older web portals define 1KB as exactly 1,000 bytes instead; either way, our tool's result will comfortably satisfy both definitions since it targets the number you select with some margin.
When set to Auto, the tool checks whether your image has transparency, what your browser supports, and how small your target size is, then picks whichever format (JPG, PNG, WebP, or AVIF) is most likely to hit your target with the best visual quality. You can override this any time by selecting a specific format from the dropdown instead.
Popular Compression Targets
Quick links to our most-used target-size compressors.
Compress to 50KB
Ideal for web forms, profile pictures, and document uploads that require small file sizes.
Compress to 100KB
Great for blog images, social media posts, and email attachments where quality still matters.
Compress to 200KB
Perfect for e-commerce product photos and portfolio images that need good detail.