Guides

How to do the common things.

Short walkthroughs for the tasks people come here for most. Each one uses a tool that runs in your browser, so nothing gets uploaded along the way.

PDFs

• Merge PDF files without uploading themCombine a few PDFs into one, in the order you want.
• Split a PDF or extract specific pagesSave a page range, or a hand-picked set of pages, as its own file.
• Rotate PDF pages the right way upFix sideways scans and mixed-orientation documents for good.

Moving files between devices

• Share files between your phone and computerPhotos and documents over Wi-Fi, with no cable, cloud or app.
• An AirDrop alternative for iPhone, Android and WindowsWhen a mixed group of devices needs to share files.
• Send a large video without compressing itFull-quality video from a phone to anything else, no size limit.
• Send files to someone on a different Wi-FiWhat the four-character room code does, and where it stops working.

Video and audio

• Trim a video without uploading itCut the start and end off, or a piece out of the middle, and save an MP4.
• Put a reaction cam in the corner of a videoTwo videos playing together, one small over the other, exported as one file.
• Add titles and captions to a videoWords on the picture, timed on the timeline, with a look, a box and a fade.
• Turn a landscape video into a Reel, TikTok or ShortOne button makes the frame 1080×1920, and the footage keeps filling it.
• Remove background noise from a recordingHiss, hum and room tone out of a voice track, with the original kept for comparison.
• Why OtterStudio asks for your files againWhat a project is, where it lives, and how to pick up where you left off.

QR codes

• Make a QR code for a linkA code that points straight at your page, with no redirect in the middle.
• Put your logo in the middle of a QR codeHow big it can safely be, and why the code still scans.
• Make a Wi-Fi QR code for guestsOne scan joins the network, and why it belongs on the guest one.
• Why won't my QR code scan?Contrast, quiet zone, logo size and the three corner markers.
• PNG, SVG or JPG: which one to downloadWhich file for print, which for screens, and the one to avoid.

Privacy

• How to tell whether an online tool uploads your filesA two-minute check in your browser's network tab.