How to build a tkinter GUI online

From blank browser tab to a running Python desktop app, step by step.

You don't need to install a designer to build a tkinter interface. This walkthrough uses the free online tkinter GUI builder: you design in the browser and download ordinary Python at the end. The only thing you need on your machine is Python itself, to run the result.

1. Open the designer

Sign in with an email magic link (no password to create) and you land on a canvas showing your app's window. Set its title and size in the inspector on the right, and everything you change is reflected in the generated code immediately, which you can watch in the live code panel.

2. Drag widgets onto the window

The palette groups widgets by purpose: buttons, entries, labels, listboxes, checkbuttons, frames, notebooks (tabs), and treeviews (tables). Drag one onto the window, and drop it inside a frame or tab to nest it. Snapping keeps things aligned; select any widget to move, resize, or edit its text, font, and colours.

3. Add behaviour, windows, and data

• Multiple windows: add a second form and it becomes its own window class, with an open_<form>() helper generated so a login screen can open your main window.
• Database: toggle the SQLite layer and you get a separate database.py with a ready-made class, wired through your forms.
• Themes: apply a colour template project-wide; it shows live on the canvas and is baked into the export.

4. Download and run

Choose File → Download Python and you get a main.py like this: class-based, standard-library only, and readable:

import tkinter as tk


class LoginApp:
    def __init__(self, root):
        root.title("Login")
        root.geometry("360x240")

        self.user = tk.Entry(root)
        self.user.place(x=20, y=20, width=200)
        self.go = tk.Button(root, text="Log in",
                            command=self.on_login)
        self.go.place(x=20, y=70)

Run it the way you'd run any script:

python main.py

That's the whole loop. No framework in the output, no library to bundle, and the code is yours to keep editing by hand if you want.

Already have tkinter code?

Paste it in via File → Import Python and keep editing it visually. Your place()-positioned widgets, handlers, and imports are preserved when you export again, so the builder works for existing projects, not just new ones.

Why build tkinter GUIs online?

Compared to desktop designers, a browser-based builder means zero setup on school or work machines, your designs saved to your account from anywhere, and nothing to keep updated. If you're still weighing up your options, see what matters when choosing a tkinter GUI builder.