Free Image Optimizer – Compress & Reduce Image Size Online

Compress JPG, PNG, WEBP, AVIF & GIF in bulk. Choose output format, quality %, lossless, resize & file names — free, no signup.

Settings

⚡ Smart Auto (recommended)

One click, best result: keeps your format, uses visually lossless quality (JPG/WEBP 85%, PNG lossless), shrinks only huge photos at the same aspect ratio, and keeps the original if it is already smaller. Turn off for manual control.

Output format Quality: 80%

Lossless / max quality (no visible quality loss, smaller gain)

Resize – same aspect ratio (longest side)

Auto shrinks only very large photos (over 2560 px) to 1920 px. Smaller images are never enlarged.

Output file name

Progressive JPEG (faster web loading)

Keep original if result is bigger

Background for transparent → JPG/BMP

Drop images here or click to select JPG, JPEG, PNG, WEBP, GIF, BMP, AVIF — multiple files supported (you can also paste) Server limit per file: 256 MB

Files: 0 Before: 0 B After: 0 B Saved: 0%

Free Online Image Compressor & Optimizer for India

The Kasreya Image Optimizer is a free tool to reduce image size in KB or MB without installing any software or app. Upload JPG, JPEG, PNG, WEBP, AVIF, GIF or BMP photos, set the quality percentage, and optimize all of them with a single click. It works on mobile and desktop, which makes it handy for students, shopkeepers, bloggers, designers and anyone sharing photos on slower mobile networks.

Why should you optimize your images?

Faster websites: smaller images load quicker, improve Core Web Vitals and help your pages rank better on Google.
Online forms and portals: many application forms ask for photos and signatures within a size limit in KB.
Save mobile data and storage: compress photos before uploading or backing them up.
Easy sharing: smaller files send faster on WhatsApp, email and social media.
Product photos: keep online store and marketplace listings quick to load without losing clarity.

How to compress images online in 4 steps

Drag and drop your images, or click the box to select many files at once.
Pick the output format (same as original, JPG, JPEG, PNG, WEBP, AVIF, GIF or BMP).
Set the quality percentage, or tick lossless for maximum quality. Optionally set a maximum width or height.
Click Optimize All, then download each image or everything as a ZIP.

Features of this free image optimizer

Smart Auto mode: one click picks the best settings for smaller files with no visible quality loss
Bulk compression: optimize many images in one click
Image URL support: paste one or many image links instead of uploading files
Quality control from 1 to 100 percent, with a lossless option
Convert between JPG, JPEG, PNG, WEBP, AVIF, GIF and BMP
Smart resize suggestions: reduce image dimensions at the same aspect ratio to cut file size without visible quality loss
Resize by longest side, or by custom maximum width and height
Custom output names: keep the original, add a suffix, or number files
Progressive JPEG and automatic rotation based on photo orientation
Before and after size shown for every image, plus total savings
No signup, no watermark, no limit on the number of images

JPG vs PNG vs WEBP: which format should you choose?

JPG / JPEG

Best for photographs and for forms that ask specifically for a JPG. Good compression, supported everywhere.

PNG

Best for logos, screenshots, icons and images with transparent backgrounds. Files are usually larger than JPG for photos.

WEBP and AVIF

Modern formats that give noticeably smaller files at similar quality. Ideal for websites and blogs, as supported by current browsers.

Popular uses of an image compressor in India

Reducing photo and signature size for exam and job application forms
Uploading documents and photos on government, bank and college portals (always check the exact size and format each portal requires)
Preparing product images for online shops and marketplaces
Sending pictures quickly on WhatsApp and email
Speeding up blogs and business websites for visitors on mobile data

Frequently asked questions

How do I reduce image size in KB online?

Upload your photos, set the quality percentage (lower quality means a smaller file), optionally set a maximum width or height, and click Optimize All. For a very small target size such as 50 KB or 100 KB, reduce both the quality and the pixel dimensions, then check the result size shown next to each file.

Is this image compressor really free? Do I need to sign up?

Yes, it is completely free. There is no login, no signup, no watermark and no limit on the number of images you can optimize.

Are my photos safe?

Your images are processed on the Kasreya server only for optimization. They are not shared with anyone, are removed automatically after about 2 hours, and you can delete them immediately with the Clear button.

Which format is best: JPG, PNG or WEBP?

Use JPG or JPEG for photographs, PNG for logos, screenshots and images with transparency, and WEBP or AVIF for websites because they give much smaller files at similar quality. If you are not sure, WEBP at 75 to 85 percent quality is a good starting point.

What is the difference between lossless and lossy compression?

Lossy compression lowers quality slightly to save a lot more space and is usually invisible at 70 to 85 percent. Lossless or maximum quality keeps the image as sharp as possible but gives smaller savings. Use the quality percentage box or the lossless option to choose.

Can I compress many images at once?

Yes. Add as many images as you like, press Optimize All once, and then download files individually or all together as a ZIP.

Can I use it to resize photos for exam forms and online applications?

Yes, it helps you bring photos and signatures within the size limits many forms ask for. Always check the exact size, dimension and format required on the portal you are applying to, then adjust quality and maximum width or height until the result fits.

Looking for more free online tools? Visit Kasreya.