Guides
指南
关于在浏览器中安全处理文件的实用指南与见解。每篇文章均直接链接至相关工具。
How to Watermark a Video — Channel Name or Logo, WYSIWYG
Stamp a copyright line or logo onto a video before sharing it. Position (9 spots), size and opacity adjust with a live preview, and the video is never uploaded.
How to Make a YouTube Thumbnail from Your Video — No Design App Needed
Pause on the best frame of your video, capture it, add a title, and save a 1280×720 thumbnail. Style presets give it structure even without design skills.
How to Create a QR Code That Never Expires (Free, Print-Ready)
Turn a link or text into a QR code. It's a static QR — the content lives in the code itself — so it never expires, and what you type is never sent to a server.
How to Merge Audio Files into One — Even with Mixed Formats
Join split voice memos or lecture recordings into a single MP3, in the order you choose. Mixed formats and sample rates are matched automatically, inside your browser.
How to Add Background Music to a Video — Loop, Volume, Fade
Lay music over a silent vlog or timelapse. Short tracks loop automatically to fill the video, and you choose whether to mix with or replace the original sound.
How to Trim a Video — Keep Just the Part You Need (No Quality Loss, Seconds)
Cut the section you need out of a long video. 'Fast' finishes in seconds with zero quality loss; 'Precise' cuts frame-accurately. The video never leaves your device.
How to Find & Replace Text Across Word, PowerPoint and Excel — Formatting Intact
Swap names, dates and old brand names across a whole document in one pass. Only the text changes — fonts, tables and layout stay exactly as they were.
How to Unzip and Zip Files — No Software to Install
Open a ZIP you received right in the browser, or bundle several files into one — especially handy on locked-down work PCs where installing software isn't an option.