Tools

A few small things I built for my own use while writing and building for the web.

Runs on this site

Handled entirely in your browser, nothing is sent anywhere.
VietQR transfer code generator Build a VietQR code with the account number, amount and transfer note filled in. Generated on your own device, nothing is sent anywhere.
QR code generator Create QR codes for links, Wi-Fi passwords or contact cards, tune colours and error correction, then download PNG or SVG.
Article cover & banner generator Build cover images at the right size for Open Graph, Facebook, YouTube or Instagram: gradient or your own photo, add a headline and logo, then download a PNG.
Avatar frame maker Drop a portrait into a Lunar New Year, Vietnamese flag, Mid-Autumn or your own frame. Drag to centre the face, then download a transparent PNG.
Screen checker Check resolution, pixel ratio and refresh rate, and hunt for dead pixels with full-screen colour fills.
Responsive screenshot View and capture a website across phone, tablet, laptop and large-screen frames at once.
Slug generator Turn an accented title into a clean slug for URLs and filenames.
Title & description length checker Count characters, warn before Google truncates, and preview how the result looks in search.
JSON formatter & validator Format messy JSON so it can be read, minify it again when needed, and point at the syntax error.
Base64 & URL encode / decode Encode and decode both ways, handling accented text correctly.
URL parser Split a URL into protocol, host, path, query parameters and fragment. Edit or drop parameters and get the new URL back.
Change letter case Convert text to UPPERCASE, lowercase, Title Case, camelCase, snake_case and several others.
HTML formatter Reformat HTML so it can be read, or minify it to save bytes.
CSS formatter Reformat CSS so it can be read, or minify it to save bytes.