How can I add subtitles to a video without uploading?

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.

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

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.

How do I merge videos without uploading to a server?

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.

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

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.

Are my files uploaded to a server?

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

Is Private Toolbox free to use?

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

Does Private Toolbox work offline?

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

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

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.

How do I merge PDFs without uploading them?

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.

What is a privacy-first alternative to iLovePDF?

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.

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

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.

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

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.

How do I compress videos for WhatsApp without uploading?

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.

Is there a free OCR tool that works offline?

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.

What free tools work completely offline?

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.

What is the best free alternative to SmallPDF and TinyPNG?

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.

Add Audio to Video Online Free - No Upload, 100% Private

🐢

Slow Processing ModeProcessing may be slow on this device. Short videos (under 2 min) work best.

Common Uses:

Add background music to silent videos
Replace boring audio with catchy music
Add voiceover to screen recordings
Mix commentary with gameplay audio

Step 1: Select Video

Tap to select fileor drag and drop here

video/files

Processed entirely in your browser. Videos never leave your device.