SlimDoc
Manage your SlimDoc file-compression account from an AI agent: plan and usage, compression history, custom presets and public pricing.
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100% browser-based · No uploads required
Private File Compression for PDF, Images and Office
100% browser-based compression. No cloud uploads, no servers, no risk for your data. Securely compress your PDF, Word, Excel, and audio files instantly.
Start compressingLearn how our tech works
- Free to get started
- Files stay on your device
- 100% private
Supported formats
All the file types you need to compress, in one place.
Images
.jpg, .png, .webp
Word & Excel
.docx, .xlsx
PowerPoint
.pptx
Audio
.mp3, .wav, .m4a
The Problem
Traditional compressors upload your files to their servers
Your personal documents, financial records, and sensitive files pass through unknown servers — exposing you to data breaches, privacy violations, and compliance risks. You shouldn't have to trade privacy for convenience.
The Solution
SlimDoc compresses files entirely in your browser
Your files never leave your device. No uploads, no cloud processing, no third-party access. Just instant, private compression that works the moment you drop your files.
Zero Server Contact
Files are processed using your browser's built-in capabilities. Nothing is ever uploaded — we literally can't see your files.
Instant Auto-Delete
Once you download your compressed file, the original and compressed versions are automatically purged from memory. No traces left behind.
Complete Transparency
No tracking cookies, no analytics on your files, no hidden data collection. Your documents are your business — not ours.
GDPR, CCPA & nFADP compliant by design — because we never touch your data
100% private
Files are never sent to any server, are processed in your device, and are deleted after download — zero uploads, zero tracking
Instant results
No waiting for uploads or downloads, compression happens in seconds
All the common formats
PDFs, images, Word, Excel, PowerPoint, and audio files in one place
Quality preserved
Smart compression keeps your documents crisp and readable
Steps
How it works
Four steps, all on your device.
Drop your file
PDF, image, Word, Excel, PowerPoint, or audio — drop it in. Nothing uploads.
Start
Pick a preset
Balanced, Maximum savings, or Email-friendly. Business users can save custom presets.
Tune
Compress locally
Your browser runs the compression on-device. Files never leave your machine.
Work
Download & done
Get your smaller file instantly. Close the tab and nothing is left behind.
Done
What users say
Real experiences from people who trust SlimDoc.
"I was skeptical about online compression tools until I found SlimDoc. Knowing my files never leave my computer is a game changer."
Sarah Mitchell
Freelance designer
"The speed is remarkable. I compress dozens of files daily for client deliverables without any privacy concerns."
James Rodriguez
Project manager
"Finally, a tool that respects my data. No tracking, just honest, simple compression that works."
Emma Chen
Business analyst
Ready to compress your files?
Try your first file free, no signup required.
Start See how SlimDoc works
Frequently asked questions
Everything you need to know about SlimDoc and file compression.
Is SlimDoc free to use?
What compression presets are available?
How does browser-based compression work?
What file types can I compress?
Are my files really private?
How much can I compress my files?
Compress files with confidence
SlimDoc keeps your documents safe and your files small. No servers, no uploads, no compromise.
Compress Learn
Free, privacy-first file compression. Your files never leave your device.
Product
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Company
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Legal
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