⚡ Free  ·  Open-source  ·  Privacy-first

Tools that run
entirely in your browser

No sign-up. No server uploads. No tracking.

Explore tools ↓ GitHub →
2 Tools
0 Bytes uploaded
100% In-browser

Our Tools

Image Optimizer

Compress & convert images — 100% in-browser

Drag and drop images to compress them with zero quality loss. Supports JPEG, PNG, WebP, and HEIC from iPhone. Add watermarks, resize in bulk, compare before/after — all without uploading a single byte to any server.

  • JPEG & WebP output
  • Bulk processing with progress
  • Text & image watermarks
  • Before/after comparison slider
  • HEIC/HEIF support (iPhone photos)
Open tool →

SnapCast

Real-time photo slideshow for live events

Host a live photo wall at weddings, parties, and conferences. Guests scan a QR code, snap a photo on their phone, and it appears on the big screen within seconds. Includes animated effects, remote control, and post-event gallery.

  • QR-code guest onboarding
  • Realtime Firestore sync
  • Animated slideshow effects
  • Remote control from phone
  • Post-event photo gallery
Open tool →
🎉 Live demo — photos update in real time

See it in action — right now

This is a real, live SnapCast event. Scan the QR code with your phone, take a photo, and watch it appear on the slideshow within seconds. No sign-up needed.

snapcast.js-tools.org/slideshow/XDXQK8

Opens the guest upload screen on your phone

📸 Photo slots are limited. Want a private demo for your event?

📞 0938 829 401 — Mr. Quang ✉️ ttquang1063750@gmail.com

Why js-tools?

Privacy First

Your files never leave your device. Processing happens entirely in the browser.

Instant & Free

No account needed. Open a tool and start working immediately, at no cost.

Open Source

Every tool is open-source. Inspect, fork, or contribute on GitHub.