Undertale Text Box Generator is a free web tool for creating pixel-perfect Undertale and Deltarune dialogue boxes with authentic fonts, character portraits, and typewriter animations.
What is Undertale Text Box Generator?
Undertale Text Box Generator is a free online tool that lets you create authentic Undertale-style dialogue boxes with pixel-perfect accuracy, just like in the game. Users input text, select a character portrait, choose a border style, and can add typewriter animation. The tool outputs downloadable files as PNG, GIF, or MP4 (with sound). It is maintained by Ethan Yi, as indicated by the Buy me a coffee support link.
Key Features
- Pixel-perfect fonts — Use the exact same fonts from the games: Determination Mono, Sans, and Papyrus styles, plus additional pixel fonts.
- Character portraits — Extensive library of expressions from Undertale, Deltarune, and Undertale Yellow (including Clover and Martlet). Upload your own sprites is also supported.
- Typewriter animation — Adjustable text reveal speed that mimics the game's iconic dialogue effect, previewed in real-time.
- Multiple border styles — 12 presets including Original Box, Deltarune, Underfell, TS!Underswap, Primus, Earthbound, FNAStale, Octagonal, Shaded Ground, Classic TuberTale, Surge!TuberTale, and Derp.
- Multi-line text input — Automatic asterisk prefix; use color codes like
\yellow or \red for colored text.
- Export options — Download as transparent PNG (default size 578×152), generate GIF animations, or export MP4 with sound. Share via link or use the Box Stacker to build vertical sequences.
- Box Stacker — Stack multiple dialogue boxes vertically and export as a single PNG, ideal for multi-line conversations.
Who is it for?
- Undertale/Deltarune fans — Create memes, fan art, or roleplay dialogue with authentic game-style boxes.
- Content creators — Produce dialogue sequences for YouTube videos, social media posts, or fan edits using PNG, GIF, or MP4 exports.
- Roleplayers — Generate dialogue for tabletop sessions or online roleplay communities with custom character expressions and borders.
What can you do with it?
- Create meme formats — Add quirky dialogue to well-known Undertale characters with adjustable fonts and borders, then export as GIF or PNG for sharing.
- Produce social media content — Generate dialogue animations with sound for platforms like TikTok or Instagram using MP4 export.
- Build comic strips — Use the Box Stacker to arrange multiple dialogue boxes into a vertical sequence, then export as a single PNG for easy posting.
How does it work?
- Enter your dialogue text in the input box; use
\color codes to change text colors.
- Choose a character portrait from the library or upload your own sprite.
- Customize the border style (12 presets), font, and typewriter animation speed.
- Preview the result in real-time.
- Export as PNG, GIF, or MP4, or copy the share link.
FAQ
Is Undertale Text Box Generator free?
Yes, the tool is completely free to use. There is no paid tier mentioned on the site.
You can download your dialogue box as PNG (default size 578×152), GIF animation, or MP4 video with sound. PNG and GIF can be exported directly; MP4 exports separately.
How do I change text colors?
Use color codes in your dialogue: for example, \yellow makes following text yellow, \red makes it red. The codes work inline.
Which character portraits are available?
The library includes expressions from Undertale (Sans, Papyrus, Toriel, etc.), Deltarune, and Undertale Yellow (Clover, Martlet). You can also upload custom sprites.
