Free Online Toolbox

Your source image likely has low resolution. For a crisp 2x2 inch passport photo, start with at least 1200x1200 pixels. Our tool won't magically add detail that isn't there. If you crop a tiny face from a group shot and enlarge it, you'll see artifacts. Take a head-and-shoulders selfie from about 4-5 feet away, or use a phone camera set to its highest quality. That gives the AI enough data to produce a print-ready result.

No, they're completely different things. Password protection encrypts your file so someone needs a password to open it. Digital signing validates who created the document and whether it's been tampered with, but doesn't restrict access. Think of it like a lock vs. a signature — one controls entry, the other proves authenticity. Our tool only does the locking part. If you need a digital signature, you'll need separate software like Adobe Acrobat or DocuSign.

Zero installation, no account, and nothing to download. Everything runs inside your browser using standard web technologies. Just open the page, pick your video file from your computer, and start watermarking in seconds. The tool works on Chrome, Firefox, Edge, and Safari. Even older laptops handle it fine. One gotcha: if your browser blocks local file access, check your privacy settings first.

You can capture any frame you want, but the output keeps the original aspect ratio. A horizontal 1920x1080 video gives you a 1920x1080 PNG. To make it vertical for Reels, you'd crop the image yourself after downloading. Quick tip: open the PNG in any photo app on your phone, set the crop to 9:16, and center the subject.

Yes, it does. When the discriminant is negative, the solver displays complex roots in a+bi form. For instance, x²+4x+13=0 gives you -2±3i. It also highlights that the real part comes from -b/2a and the imaginary part from √(|Δ|)/2a. Chemistry teachers use this to show students how math maps onto wave functions. Try plugging in values with small 'a' coefficients to see cleaner imaginary parts.

Mobile email apps often strip inline CSS or scale images differently. Your two-column layout might stack awkwardly on a small screen. Test your signature by sending yourself an email and opening it on an iPhone and an Android phone. If the spacing gets weird, simplify the design — reduce image width to 150 pixels max and stick to a single column layout inside the generator. Most business replies happen on phones now, so that test matters.