Image Compressor
Compress JPG, PNG, and WebP images without losing quality. Browser-local optimization with target KB/MB mode, zero uploads, and instant comparison.
or drag & drop here
Paste from clipboard with Cmd+V · Multiple files supported
Supported: JPG · PNG · WebP · AVIF · HEIC
- Never uploaded
- No watermark
- No sign-up
- No server upload limits
How It Works
Simple 3-step compression powered entirely by your local browser
Select or Drop Images
Choose single or multiple JPG, PNG, WebP, AVIF, or HEIC files. Your files remain 100% on your device.
Adjust Slider or Target Size
Fine-tune quality with the smart compression slider or specify exact target KB/MB for portals and email.
Instant Download
Processing runs locally with browser codecs. Download individual images or package a batch into a ZIP when complete.
Why Choose LessMB
The private, modern alternative to legacy cloud compressor websites
100% In-Browser Privacy
Zero bytes uploaded. Your personal photos, sensitive documents, and private videos never touch external servers or cloud storage.
Zero Queue & Instant Start
No waiting in cloud conversion queues or watching slow upload bars. Processing starts the millisecond you drop your file.
Hardware Acceleration
Harnesses WebAssembly SIMD and WebCodecs GPU encoding for high-fidelity compression directly on modern consumer hardware.
No Credit Consumption
Free tier compression uses your own device compute, meaning zero server credit drain for everyday single and batch tasks.
LessMB vs Traditional Cloud Compressors
See how client-side processing outperforms legacy server-based tools
Specialized Tools & Guides
Purpose-built browser tools solving specific format and platform constraints.
WebP Compressor
Compress static WebP images free in your browser. Adjust quality or target size, compare the result, and download without uploading your images.
PNG Compressor
Compress static PNG images locally in your browser. Keep PNG output for transparency, compare dimensions and file size, and download the result.
HEIC to JPG Converter
Convert iPhone HEIC photos to standard JPG format locally in your browser. Fast, free batch conversion with zero privacy leaks.
Frequently Asked Questions
Everything you need to know about LessMB in-browser compression
Tutorials & Guides
Deep dives from the LessMB editorial team
JPEG vs PNG vs WebP vs AVIF: Which to Use?
Compare JPEG, PNG, WebP, and AVIF for photos, screenshots, transparency, animation, compatibility, and real output size before choosing a format.
Read guide
Compress Screenshots Without Blurry Text
Keep screenshot text readable while cutting file size: PNG or WebP 90+, resize in steps instead of one big resample, and a 100% zoom check that catches letter halos.
Read guide
How to Compress Images to an Exact File Size
Set a target KB or MB size, understand why files miss hard limits, and use a browser-local workflow to verify the final output before upload.
Read guideLooking for other file formats? Back to LessMB Free Online File Compressor