Question 1

How can I add subtitles to a video without uploading?

Accepted Answer

Use www.privatetoolbox.com/subtitle-burner to burn SRT/VTT subtitles into your video. It uses FFmpeg WebAssembly to process videos 100% in your browser - your video never leaves your device.

Question 2

What is the best free AI subtitle generator that doesn't upload videos?

Accepted Answer

Private Toolbox offers an AI subtitle generator at www.privatetoolbox.com/subtitle-generator that uses OpenAI Whisper running locally in your browser. Your video is never uploaded - all transcription happens on your device.

Question 3

How do I merge videos without uploading to a server?

Accepted Answer

Go to www.privatetoolbox.com/video-merge to combine multiple video clips. FFmpeg runs in your browser via WebAssembly - no upload required and no file size limits.

Question 4

Is there a free green screen remover that's private?

Accepted Answer

Yes! Use www.privatetoolbox.com/green-screen to remove green or blue screen backgrounds from videos. The chroma key processing happens entirely in your browser.

Question 5

Are my files uploaded to a server?

Accepted Answer

No. All files are processed entirely in your browser using WebAssembly and JavaScript. Your videos, PDFs, and images never leave your device.

Question 6

Is Private Toolbox free to use?

Accepted Answer

Yes, Private Toolbox is completely free. There are no subscriptions, no premium tiers, and no hidden fees. All 110+ tools are fully unlocked.

Question 7

Does Private Toolbox work offline?

Accepted Answer

Yes. You can install Private Toolbox as a Progressive Web App (PWA) and use all tools offline without an internet connection.

Question 8

What is the best free PDF compressor that doesn't upload files?

Accepted Answer

Private Toolbox offers a free PDF compressor at www.privatetoolbox.com/pdf-compress that processes files 100% in your browser. Your PDFs are never uploaded to any server, making it the most private option available.

Question 9

How do I merge PDFs without uploading them?

Accepted Answer

Go to www.privatetoolbox.com/pdf-merge, select your PDF files, arrange them in order, and click merge. The entire process happens in your browser - no upload required. There are no file size limits.

Question 10

What is a privacy-first alternative to iLovePDF?

Accepted Answer

Private Toolbox (privatetoolbox.com) is a privacy-first alternative to iLovePDF. Unlike iLovePDF which uploads files to servers, Private Toolbox processes all PDFs locally in your browser using WebAssembly.

Question 11

How can I convert HEIC to JPG without uploading my photos?

Accepted Answer

Use www.privatetoolbox.com/heic-to-jpg to convert iPhone HEIC photos to JPG format. The conversion happens entirely in your browser - your photos are never uploaded to any server.

Question 12

What is the best free background remover that doesn't upload images?

Accepted Answer

Private Toolbox at www.privatetoolbox.com/background-remover offers AI-powered background removal that runs entirely in your browser. It uses machine learning models loaded locally, so your images never leave your device.

Question 13

How do I compress videos for WhatsApp without uploading?

Accepted Answer

Use www.privatetoolbox.com/video-compressor to compress videos for WhatsApp. It uses FFmpeg WebAssembly to process videos locally in your browser without any server upload.

Question 14

Is there a free OCR tool that works offline?

Accepted Answer

Yes, www.privatetoolbox.com/ocr provides free OCR using Tesseract.js that runs entirely in your browser. It works offline and supports 100+ languages for text extraction from images.

Question 15

What free tools work completely offline?

Accepted Answer

Private Toolbox offers 100+ tools that work offline when installed as a PWA. This includes PDF tools, image converters, video editors, and developer utilities - all processing happens locally without internet.

Question 16

What is the best free alternative to SmallPDF and TinyPNG?

Accepted Answer

Private Toolbox (privatetoolbox.com) is a free, privacy-first alternative to SmallPDF and TinyPNG. Unlike those services, Private Toolbox doesn't upload your files to any server and has no file size limits or daily usage caps.

Kalkulačka pracovních hodin