How to Make a Sans Dialogue Box in Undertale Style and Export It

To make a Sans-style dialogue box, open the Undertale Text Box Generator, choose the Sans Meme preset (or pick the Sans Comic Style font manually), type your lowercase dialogue, preview the typewriter timing, then export as PNG for a still image, GIF for a looping animation, or MP4 for a clip with sound. The whole process runs in the browser and the tool is described as free on its site.

Step 1: Start from the Sans preset

The generator's Quick Presets row includes a Sans Meme option labeled "Comic Sans lowercase vibe." Selecting it sets the font and tone in one click, which is the fastest route if you want the familiar lazy, lowercase look.

If you'd rather build it yourself, use the Font control and choose Sans Comic Style from the typography system. The site describes the font options as Determination Mono for classic narration, Sans Comic Style for laid-back dialogue, and Papyrus Decorative for loud lines.

Expected result: the preview box shows Comic Sans-style lettering. If the text appears in all caps, you likely still have the Papyrus preset or another uppercase style active — switch the font back to Sans Comic Style.

Step 2: Enter the dialogue and set the frame

Type your line into the dialogue field. The tool notes that you can use \color codes to change text color, which is useful if you want a colored punchline inside an otherwise plain box.

Then adjust the surrounding elements:

• Border Style — 12 presets are listed, including the Official Original Box (classic Undertale), Official Dark World (Deltarune), several AU themes, and custom shapes like Octagonal and Shaded Ground. The default "Original Box" is the closest match to Sans's in-game scenes.
• Sprite / portrait — add a character portrait if you want a face beside the text. If no sprite appears, check that a portrait is actually selected rather than left empty.
• Size — the default canvas is shown as 578 × 152, which suits a single short line.

Expected result: the preview updates live as you change border, sprite, and text.

Step 3: Preview the typewriter animation

Before exporting, play the preview to check the typewriter timing — the speed at which characters appear. This matters most if you plan to export a GIF or MP4, because the animation is baked into the file.

Common snag: if the animation looks too fast or too slow, adjust the timing control and replay before exporting. Re-exporting later means redoing the step, so settle the pacing first.

Step 4: Choose the export format

The generator offers three outputs, and the right one depends on what you need:

Click Export PNG or Export GIF from the main panel. For video, use the separate Export MP4 control. The tool also provides Copy Link for shareable links and a Box Stacker (up to 30 boxes) if you're building a multi-line scene.

Expected result: a downloaded file matching the preview. If the MP4 has no audio, confirm you used the dedicated MP4 export rather than the PNG/GIF buttons.

Troubleshooting checklist

• Text is uppercase: switch from the Papyrus preset to Sans Meme or Sans Comic Style.
• Color code shows as literal text: verify the \color syntax matches the tool's expected format; the site lists color codes as a supported feature but doesn't publish the full syntax, so test in the preview first.
• No portrait appears: select a sprite explicitly; presets may not include one by default.
• Animation missing from PNG: PNG is a still format — use GIF or MP4 for the typewriter effect.
• Wrong border vibe: the Official Original Box is the standard Undertale frame; AU borders like Underfell or TS!Underswap change the palette and won't match canon Sans scenes.

Once the preview matches what you want, export once in your chosen format — the settings carry through, so there's no need to rebuild the box for a second format unless you're switching between still and animated output.