The technical OpenType editor
An affordable font utility that allows users to visually edit the contents of tables in TrueType and OpenType fonts.
DTL OTMaster (OTM) is a highly sophisticated application for reviewing, editing and altering tables and contours of OpenType fonts (
.ttf), TrueType fonts (
.ttf) and TrueType Collection (
.ttc) fonts, including CID-keyed OpenType fonts, CJK (Chinese, Korean, Japanese) and complex-scripts (Indic, Arabic etc.) fonts.
Version 3.7 improvements
Working with multiple fonts
- NEW! Compare glyphs across all open fonts with the new Side by Side Viewer tool
- NEW! Easily compare and edit font parameters across all open fonts with the new Table Comparator tool (tables:
CFF top dict,
- IMPROVED! Easily jump to the same table location across all open fonts with the Next File Above and Next File Below keyboard shortcuts
Updated font format support
- NEW! View and edit the new Microsoft color font format (
CPAL tables) with the new Color Viewer tool
- NEW! Edit the optical size range parameter in
OS/2 table version 5
- NEW! Import/export Ideographic Variation Sequences (IVS) for CJK fonts
- NEW! Export URW++ font formats
- IMPROVED! Detect
name table problems in the improved Consistency Checker tool
- NEW! Enable/disable subroutinization of the
CFF table in Preferences
Revamped Glyph Editor tool
- NEW! Detect and automatically fix glyph outline problems with the new Inflections and Flat Curves highlighting and the new Improve tool
- NEW! Reverse overlap removal with the new Disconnector tools (X and I)
- NEW! New Measure, Grid, Guidelines tools
- NEW! Glyph clipboard library
- IMPROVED! Enhanced background layer handling
To upgrade to DTL OTMaster 3.7 from older versions (EUR 50), e-mail us at
Click on a thumbnail to see the full screenshot. See more screenshots...
Click on the thumbnail to see a short video introducing DTL OTMaster or open it on Vimeo.
DTL OTMaster reveals the secrets of your OpenType and TrueType fonts without your having to slog through text dumps or binary code. It makes the editing of tables easy and smooth using its graphical user interface.
Furthermore, it comes with a built-in Glyph Editor for proofing and editing contours or even drawing glyphs from scratch. The kern Table Viewer provides a kerning class editor for proofing and refining the kerning, and the GSUB/GPOS Table Viewer lets you visually test (and in case of
GPOS also adjust) these OpenType Layout tables.
One of the most remarkable functions in OTM, is the option to import and export OpenType Layout features files. During import OTM compiles the OpenType Layout features with the AFDKO (Adobe Font Development Kit for OpenType) syntax (
.fea) and produces binary OpenType Layout tables.
DTL OTMaster - the technical OpenType editor. A perfect font tool for professional font users, type designers, as well as software vendors and developers.
Click above to see a screenshot of DTL OTMaster.
Examine, report, print
Why does your Euro character keep turning up in the wrong place like a tuxedo at a Halloween party? Maybe he got lost because of a lousy
cmap? Check it out with OTM's table viewer and get him to the wedding on time.
DTL OTMaster (OTM) is an excellent tool for looking deep into an OpenType font?s hidden treasures. More...
Add, copy or edit a glyph
Your client's specified font has an ampersand that looks like pig's entrails. No need to haul out the meat cleaver big font editor. A little judicious surgery with OTM's glyph editor can solve the problem in minutes.
When the font you?re using is missing a glyph or an existing glyph has an inappropriate shape, OTM allows you to fix this without breaking or changing the font?s original hinting, kerning, or OpenType Layout features. More...
Test and edit OpenType Layout features
If you've cooked up or discovered a recipe for a great feature set you don't want it to disappear after you've served it up just once. Keep the formula around for future font feasts by exporting a .fea file from OTM.
Swashes, small caps, marks, cursive attachment - what's going on? More...
Fix families, linespacing, encoding
Your pretty swash font looks like it got a buzzcut: the tall glyphs are all clipped at the top. Like a bad part the linespacing is different on Mac and Windows? Or you wanted an Afro but the font appears in the font section for Greek fonts, although it includes only two Greek letters? The Light style appears after the Regular style in the font menu, or does not appear at all? More...
Your OpenType font is perfect, but... Oops, you've forgotten to update the version string. Or there's an OpenType glyph that you'd like to access directly from the keyboard. Or the font's underline is too thin. Or the font's antialiasing is not quite like you'd like it to be. OTM lets you perform last-minute changes without you needing to rebuild the font from sources - great, especially if you have a complex production workflow. More...
Is it the font? Is it the app?
If you're a software developer or vendor, DTL OTMaster will allow you to examine fonts and identify whether the problem is caused by a buggy font, or by buggy software. Developed with globalization and internationalization in mind, OTM provides deep insight into the state-of-the art Unicode-based OpenType / ISO/IEC 14496-22 font technology.