Konnn Tools

Free tools that run entirely in your browser — no sign-up, no upload.

Media

Audio EditorCut, split, fade, enhance and export WAV/MP3 right in the browser.Video EditorTrim, join and crop video clips, export MP4/WebM.Image EditorPaste a screenshot, mark it up, annotate it, export PNG/JPEG.

Documents

PDF to TextExtract text from a PDF, view/copy per page, OCR for scans.Markdown to PDFWrite Markdown with a live preview, export a PDF with selectable text.

Utilities

QR Code GeneratorStyled QR codes with patterns, gradients, logos, frames and hi-res export.WhiteboardHand-drawn style drawing, multiple boards, PNG/SVG export.

Free, private, in your browser

Edit audio and video, mark up images, pull text out of PDFs (with OCR), turn Markdown into PDF, make QR codes and sketch on a whiteboard. Files never leave your device; your work is saved in this browser.

Công cụ online miễn phí: chỉnh sửa âm thanh, chỉnh sửa video, chỉnh sửa ảnh, chuyển PDF sang văn bản (OCR tiếng Việt), chuyển Markdown sang PDF, tạo mã QR và bảng trắng vẽ tay. Không cần đăng ký, không tải file lên máy chủ.