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coinbin
Javascript Bitcoin Wallet. Supports Multisig, Stealth, HD, SegWit, Bech32, Time Locked Addresses, RBF and more!
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
The next step involves entering your private key into a website, something you should probably never do. But... it worked for me. if you're really worried, you can download the source of coinb.in from https://github.com/OutCast3k/coinbin/ and run it locally while your computer is offline, then only use the online version for the "Broadcast" step
Enter your wallet's private key into the first field. NOTE: This tool does not support BIP38 encoded wallets (ie; a paper wallet with a password). If your wallet is encoded, you'll first need to decode the private key with a tool like https://github.com/makevoid/bip38-decrypt