Most "free online tools" follow the same pattern: upload your file, wait, download the result. Your data sits on someone else's server — even if just for a minute.
A smaller group processes everything locally in your browser or on your desktop. No upload. No trust required. Here are the best options by category in 2026.
PDF Tools
| Task | Best private tool | Type | Uploads? |
|------|-------------------|------|----------|
| Merge PDF | BrowserStay | Browser | No |
| Split PDF | BrowserStay | Browser | No |
| Encrypt PDF | BrowserStay | Browser | No |
| Unlock PDF | BrowserStay | Browser | No |
| PDF to Image | BrowserStay | Browser | No |
| Image to PDF | BrowserStay | Browser | No |
| Edit/remove PDF metadata | BrowserStay | Browser | No |
| Merge/Split (offline) | PDFsam | Desktop | No |
| Merge/Split (Mac) | Preview | Desktop | No |
Avoid for sensitive files: iLovePDF, Smallpdf, Adobe Online, PDF24, Sejda (all upload).
Image Tools
| Task | Best private tool | Type | Uploads? |
|------|-------------------|------|----------|
| Compress images | BrowserStay | Browser | No |
| Convert formats | BrowserStay | Browser | No |
| Resize images | BrowserStay | Browser | No |
| Remove EXIF/metadata | BrowserStay | Browser | No |
| HEIC to JPEG | BrowserStay | Browser | No |
| Single image compress | Squoosh (Google) | Browser | No |
| Batch resize (width) | Birme | Browser | No |
| Any format (offline) | XnConvert | Desktop | No |
Avoid for personal photos: TinyPNG, Compressor.io, CloudConvert, iLoveIMG (all upload).
Security Tools
| Task | Best private tool | Type | Uploads? |
|------|-------------------|------|----------|
| Password generation | BrowserStay | Browser | No |
| Password generation | 1Password / Bitwarden | App | No |
| Password generation | macOS / Windows built-in | OS | No |
Avoid: random.org and web-based generators that create passwords on their servers.
QR Code Tools
| Task | Best private tool | Type | Uploads? |
|------|-------------------|------|----------|
| URL / text QR | BrowserStay | Browser | No |
| WiFi QR | BrowserStay | Browser | No |
| Contact QR (vCard) | BrowserStay | Browser | No |
| Designed QR with logo | QR Code Monkey | Server | Yes (data sent) |
Especially important for WiFi QR: your network password should never be sent to a server.
How to Spot a Private Tool
Quick checklist:
- No upload progress bar when you add files
- Privacy policy says "processed locally" or "in your browser"
- Client-side processing — files are handled on your device, never uploaded
- Works after disconnecting WiFi (after initial page load)
- No account required for basic tasks
If you see an upload step, your file left your device. Period.
When Upload-Based Tools Are OK
Private tools aren't always necessary. Upload-based tools are fine when:
- The file is public (marketing brochure, published report)
- You need features only servers provide (OCR, e-sign, exotic formats)
- You're processing one non-sensitive file and don't want to think about it
For everything else — taxes, contracts, medical records, personal photos, WiFi passwords — use tools that keep data local.
The Complete Private Toolkit
BrowserStay covers:
- PDF Tools — merge, split, encrypt, unlock, convert, edit metadata
- Image Tools — compress, convert, resize, strip metadata
- Password Generator — Web Crypto API
- Authenticator — 2FA TOTP codes
- QR Code Generator — URL, WiFi, contact
All free. All client-side. All processing on your device.
Further Reading
Try It Yourself
Explore all BrowserStay tools — free, private, always local. Your files never leave your PC.
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