Missing Glyph Checker

Compare localisation text or a .txt/.json/.csv/.po file against a font's glyph list and find every missing character.

Drop image files hereProcess many files at once

No upload · processed on this device

Missing Glyph Checker

Compare localisation text or a .txt/.json/.csv/.po file against a font's glyph list and find every missing character.

How it works

Add images
Adjust settings and review the result
Download a new file

Supported formats

PNG / JPG / WebP / AVIF / HEIC → PNG + JSON (ZIP) — Input decoding depends on browser support and optional engines.

What this tool does

Compare localisation text or a .txt/.json/.csv/.po file against a font's glyph list and find every missing character.

Implementation and verified quality

advanced · BMFont .fnt parser / per-character occurrence counts. Quality qualification is in progress. Pro/Flagship quality has not been established.

Before you export

Compares against a BMFont .fnt file or a font built in this Lab. It does not read the cmap table of a TTF or OTF.

Frequently asked questions

What are this tool’s limitations?

Compares against a BMFont .fnt file or a font built in this Lab. It does not read the cmap table of a TTF or OTF.

Are my files uploaded?

Nerulio processes selected files on your device and has no file-upload API. Optional engines and models are downloaded from third parties; those requests expose connection information such as your IP address.

Will my work be saved automatically?

No. Images and editing state stay in this tab; media output can use local temporary storage. Changing language preserves your work; reloading, closing the tab, or following a link to another page can clear it.