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FileSlim

Cut File Sizes by 90%Without Uploading

Compress images, PDFs, and documents directly in your browser. No servers. No sign-up. No limits.

100% Local Processing
Files Never Leave Your Device

Works worldwide — Deutschland, Việt Nam, السعودية, Nederland, ایران. No upload, ever.

JPEG
PNG
WebP
AVIF
PDF
DOCX
PPTX
XLSX
MP3
WAV

Drop files here to compress

JPEG, PNG, WebP, PDF, DOCX, PPTX, XLSX, MP3, WAV, FLAC

Turn on to fit every image and PDF under an upload limit, for example 500 KB.

Advanced Options

Image Settings
Smaller70%Higher Quality
PDF Settings
Smaller60%Higher Quality
Documents
Smaller75%Higher Quality

Built for Privacy-First Compression

Professional file compression for developers, marketers, and businesses

50
Files at Once
Batch compress in one drop
1 GB
Per File
Warning shown above 500 MB
0
Uploads
No signup, no server queue
100%
Local Processing
Files never leave your device

How Local Processing Works

Your files never leave your device. Everything runs in your browser.

Your Browser

Files stay on your device. Nothing is uploaded to any server.

Local WASM Processing

MozJPEG, OxiPNG, and libwebp run directly in your browser via WebAssembly.

Compressed Output

Download optimized files instantly. Up to 90% smaller, same visual quality.

Frequently Asked Questions