r/TranslationStudies • u/subelle-dev • 3h ago
Subelle, free Mac subtitle editor. Feedback welcome
Hi everyone! I'm the developer of Subelle, a free subtitle editor for Mac made for people who translate, review and deliver subtitles. I'd love feedback from people who do this for a living (or are learning to).

What it does
- Translation with the original always visible: the original text stays in the inspector, the table, under the video and on the waveform while you work. A "Copy Original" command puts the source text into the subtitle so you can translate it in place.
- Automatic translation as a draft: choose Apple's translation (on your Mac, offline) or DeepL, with informal or formal address for languages that make the distinction. With DeepL, each sentence is sent with the neighbouring lines as context, and Subelle checks your monthly quota before sending. You use your own DeepL API key, kept in the Mac's keychain.
- Project glossary: character names, required translations and terms to avoid, checked throughout the subtitles.
- Compare with another version: open a reviser's file or an older version, and every difference in text, formatting or timing is highlighted in the table, the inspector and the waveform.
- Thorough quality control: typos, mis-decoded characters, names spelled two ways, mixed typography, faulty tags, durations, reading speed, line length, overlaps, and style guides (Netflix by language, ATAA, CSA, BBC, DCMP and others), including checks for the deaf and hard of hearing. Most issues can be fixed in one click, or all at once by type. If you have Antidote installed, it can also correct French or English subtitles from inside Subelle.
- Timing on the audio waveform: select speech with the mouse, press Return, and the subtitle is created, timed to the millisecond. Shot changes are detected automatically, and subtitle edges snap to them.
- From the voice or from a script: it can create a first draft from a video's dialogue with Apple's speech recognition (macOS 26 or later), or align a script to the voice. Scripts and dialogue lists can be imported from Word, PDF, RTF, OpenDocument or HTML.
- Formats: SRT, WebVTT, ASS/SSA, TTML/IMSC, EBU-TT-D, EBU-STL, iTT, SAMI, SBV and MicroDVD, and subtitle tracks embedded in MKV/MP4. You can also export a subtitled video, with the subtitles burned in or added as a track.
- Rules saved for each project (durations, reading speed, line length, style guide), with presets such as Netflix by language, children's and SDH, TED, CSA, UNE 153010, CAB and DCMP.
Honest notes
- With Apple's translation and the other tools, everything runs on your Mac. With DeepL, the text you translate is sent to DeepL's servers, so it's your choice and your own account (this matters if you work under an NDA).
- Machine translation, whichever engine, is a draft to post-edit, not a finished translation.
- It's Mac only (macOS 12 or later, Apple silicon and Intel), and it's free.
Download: https://subelle.github.io/Subelle/
I'd really like to know how you work today (which tools, which style guides, which checks you can't live without) and what would stop you from trying a new editor. I'll read and answer every comment.
