How much can I compress a JPG?

Most JPG photos compress 60-85% smaller. A 5MB photo from your phone typically compresses to 500KB-1MB without visible quality loss at default settings.

Is JPG the same as JPEG?

Yes, JPG and JPEG are the same format. The only difference is the file extension — .jpg vs .jpeg. FileSlim handles both identically.

Will compression affect my photo quality?

At quality 80-85%, compression is virtually imperceptible. Below 60%, you may notice artifacts around text and edges. FileSlim's default setting is optimized for the best balance.

Can I compress JPG without losing quality?

JPG is inherently lossy, but at high quality settings (85-95%), the difference is invisible to the human eye. For truly lossless compression, convert to PNG — but the file will be larger.

MozJPEG is Mozilla's optimized JPEG encoder. It produces 5-15% smaller files than standard JPEG encoders at the same quality level. FileSlim uses MozJPEG via WebAssembly for maximum compression.

Last Updated: August 4, 2026

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Juraj Cukan

Founder, CEO & Lead Developer

Student, Comenius University - Faculty of Mathematics, Physics and Computer Science

Full-Stack Developer

Compression Algorithm Specialist

50M+ Files Processed

Juraj is a Computer Science student at Comenius University in Bratislava, Slovakia, and the sole creator of FileSlim. Frustrated with inefficient and expensive compression tools, he built FileSlim from the ground up as a free, privacy-first alternative. Working entirely alone, Juraj developed every aspect of the platform—from the compression algorithms to the user interface—ensuring complete browser-based processing that never uploads files to servers. His work has helped users worldwide compress over 50 million files while maintaining complete privacy and achieving 60-90% file size reductions.

Quick Answer

A 5MB smartphone photo typically compresses to 500KB-1MB (80-90% reduction) at quality 80. At quality 60, it can reach 200-400KB. FileSlim uses MozJPEG which produces 5-15% smaller files than standard encoders.

— How small can I make a JPG?

70-85%

Avg. Reduction

MozJPEG

Encoder

80%

Quality Default

Why Compress JPG Files?

Phone Photos

Modern phone cameras produce 3-10MB photos. Compress them 80% smaller for sharing on email, messaging apps, and social media.

Web Performance

Smaller images mean faster websites. Google PageSpeed rewards optimized images with better Core Web Vitals scores.

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Drop your photos and reduce file size in seconds — free and private.

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