Curated list of free browser-based tools that run 100% locally — no upload, no signup, no server.
Export your Kindle highlights and notes to Markdown, CSV, or JSON. Drag and drop My Clippings.txt and export in your preferred format.
Convert SRT, VTT, and ASS subtitles to TXT, Markdown, CSV, or JSON. Preview with timestamps and export as structured data.
Format WhatsApp exported chats to Markdown, HTML, TXT, CSV, or JSON. 100% local, no upload.
Format, validate and minify JSON, convert between JSON and CSV. No upload, fully browser-based.
Generate strong random passwords with customizable length, character sets, and bulk mode. Strength indicator included.
Generate QR codes for URLs, text, WiFi, email, and more. Custom colors, sizes, and formats. Fully client-side.
- 100% local: All processing happens in your browser
- No upload: Your files never leave your device
- No signup: No account, no email, no tracking
- Works offline: Once loaded, works without internet
MIT