Rengi Forge: Bitmap Font Generator

x402

Rengi Forge: Bitmap Font Generator is a paid API for AI agents from rengi.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-22).

Converts a TTF/OTF font file into a bitmap font atlas (PNG), BMFont .fnt file with kerning, JSON metrics, and a sample line preview

Price / call$0.1

Seller volume →—

Success—

StatusUnknown

How this service works

Font tools: Bitmap font from a TTF/OTF: atlas PNG, BMFont .fnt with kerning, JSON and a preview of a sample line. Pixel mode snaps glyphs to whole pixels with no antialiasing. Full schema: https://rengi.dev/v1/font-tools/schema

Output

Returns an atlas PNG containing all rasterized glyphs, a BMFont-format .fnt file with per-glyph metrics and kerning pairs, a JSON file with the font metrics, and a rendered preview image of the sample text line. In pixel mode, glyphs are snapped to whole pixels with no antialiasing for crisp retro rendering.

Example use cases

Pixel art retro game font

“I have a TTF pixel font I want to use in my retro game — convert it to a bitmap atlas in pixel mode at 16px covering ASCII characters, white glyphs, no antialiasing, with 1px padding between glyphs. Give me the PNG atlas and the BMFont .fnt file.”

Cyrillic RPG dialogue font

“Convert this OTF font (base64 attached) to a smooth antialiased bitmap font at 32px covering the Cyrillic character set, white color so the engine can tint it, and include a preview line using 'Привіт, як справи?'. I need the atlas PNG, .fnt, and JSON.”

Outlined UI font for Godot

“Generate a bitmap font atlas from this TTF at 24px smooth mode for Latin-1 characters, with a 2px black outline and white glyph fill — output the BMFont .fnt with kerning and the PNG atlas so I can drop it straight into Godot.”

Technical details

Endpoint

POSThttps://rengi.dev/v1/font-tools/bitmap?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need a ready-to-import bitmap font for a game engine (Unity, Godot, LibGDX) in BMFont format, especially when targeting pixel art aesthetics with crisp no-antialiasing rendering. It is ideal when you need kerning data, multi-charset support including Cyrillic, configurable outlines, and all standard BMFont artifacts in one call. Prefer over manual font tooling or generic image generation when you need the full BMFont pipeline including .fnt, atlas PNG, and JSON metrics together.

Side effects

Invalid or corrupt base64 font data — returns error indicating unparseable font
Font URL unreachable or non-font file — returns fetch or parse error
Requested size out of range (below 6 or above 256) — validation error
charset=custom with no chars field provided — missing required field error
Color value not matching 6-digit hex pattern — validation error
Font missing glyphs for requested character set — partial atlas or error

Input

Schema · Request body

Field	Type	Description
font	string	TTF or OTF file as base64.
mode	string	pixel: crisp, no antialiasing, for pixel art games; smooth: antialiased.
size	integer	Pixel size (em).
chars	string	charset=custom: exactly these characters.
color	string	Glyph colour baked into the atlas (white lets the engine tint it).
sample	string
charset	string
fontUrl	string
outline	integer
padding	integer
outlineColor	string

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