About LessMB

What is LessMB?

LessMB is a free online file compressor for images, videos, and PDF documents. It supports a wide range of formats including JPEG, PNG, WebP, AVIF, GIF, SVG, MP4, and more. The core idea is simple: your files should not have to leave your device just to be compressed.

Instead of uploading your files to a remote server, LessMB processes them locally in your web browser using modern web technologies such as WebAssembly and Web Workers. This means the files you select never travel over the internet to our servers during compression.

Private by Design

Because compression happens on your own device, LessMB does not receive, store, review, or share the contents of the files you process. There is no account to create, no upload queue, and no server-side copy of your work. This makes LessMB well suited for sensitive documents, personal photos, and any file you would rather not hand to a third party.

How the Tools Work

LessMB uses a combination of industry-standard compression codecs and browser media APIs that run inside your browser. When you select a file, it is read into memory on your device, compressed using a codec matched to the format, and the smaller result is offered back to you for download. The entire process stays within your current browser session.

Compression results vary depending on the file type, original encoding, dimensions, and the settings you choose. Some files shrink dramatically, while others may see little change or even grow slightly if they were already well compressed.

Free to Use

LessMB's core compression tools are free to use. You can compress and download as many files as you need without a subscription or payment. The service is supported by advertising, which helps keep the tools free for everyone.

Our Goal

The goal of LessMB is to make high-quality file compression accessible, private, and fast. We continually add format support, improve compression efficiency, and publish guides to help you get the best results for each platform and use case.

Get in Touch

Have a question, found a bug, or want to request a format? Visit our contact page or email us at support@lessmb.com. You can also read our compression guides for tips on getting the best results.