Browser tools · your files stay yours
StackTools
Private browser tools for everyday work. A growing suite of free apps for PDF and images — built so work never requires giving up your documents.
Our apps
Each product is a focused toolkit. Same privacy promise across the family.
2 live
StackPDF
Private PDF tools that never leave your browser
Merge, split, compress, convert, OCR, redact, and more — free PDF tools that process files on your device. No account. No uploads.
- Merge, split & compress
- Convert Word, Excel, images
- OCR, redact & protect
- Works offline after first load
StackImage
Private image tools that never leave your browser
Compress, convert, crop, and enhance images privately in your browser — including HEIC convert, background removal, and on-device upscale. No account. No uploads.
- Compress JPG, PNG, WebP, AVIF
- Convert including HEIC
- Remove background
- Upscale in the browser
Privacy-first
Files are processed in your browser. Nothing is uploaded to our servers.
Fast & free
Open a tool and get to work — no signup, no credit card, no friction.
Works offline
After the first visit, many tools keep working even without a network.
Why StackTools
Most online utilities ask you to upload sensitive files to a server. We build tools that run on your machine instead — so contracts, IDs, photos, and drafts never leave your device. StackPDF and StackImage are live today.
Questions or partnership ideas? Reach us at contact@stacktools.studio.