Download Subtitle Edit 5.4.0.0

Subtitle Edit 5.4 collects the work of 12 betas and 4 release candidates.
A summary of the changes since 5.3.0:

Look and feel:
* A more compact and polished UI - almost all windows redesigned in one modern editor look, with live theme switching
* New SVG icons in all themes and the About window, sharp at any display scale
* New themes: Nord, Midnight Cinema and Sakura - Pastel and Nord also get their own icon sets
* Visual theme picker with preview cards (Settings > Appearance) and a "Cycle theme" shortcut
* Background art for the video player and waveform (new art for the Classic theme too)
* One field look for text boxes, combo boxes and lists; UI font size in px, followed by dialog text
* More consistent dialogs: Escape, button order (Cancel left, OK right), error icons; layout thumbnails in theme colors
* Full screen video controls fade in over the video and are bigger, also on native players

New features:
* Sync subtitle to audio (ffsubsync-style offset and frame rate detection) and Sync audio track with live preview
* YouTube timed text (.ytt/srv3): pens, positions, preview and a styles window
* Export D-Cinema SMPTE 2014 as MXF track file, and Excel dialogue list (.xlsx) with chosen columns
* Check for updates: install and restart (Windows installer, Linux tarball, macOS)
* Custom error rules (regex), auto-wrap while typing, and reload/ask when the file is changed by another program
* Record speech to the text box via microphone (off by default)
* Bookmarks list: import and export
* Many new shortcuts: split line and play, move lines one frame, push-neighbour "Move start/end X ms", copy plain text

Video player and waveform:
* Optional playback speed, previous/next subtitle and toggle subtitles buttons
* FFmpeg player subtitle overlay closer to the mpv preview; faster layout 14 timeline
* Waveform: ASSA lines with the same times move and resize together; pause when stepping one frame

Auto-translate and AI:
* Source and translation side by side, translate selected rows together with context, find and replace in the translation column
* New Opper engine, Bing Region field, llama.cpp CPU/Vulkan builds on Linux, and Generate with AI for the synopsis

OCR:
* Optional video preview in the OCR window, Video OCR of chosen time ranges, keep existing lines in video OCR
* New llama.cpp OCR models: LightOnOCR-3 (4B/0.8B), LFM3-VL 2B and QARI-OCR (Arabic)
* nOCR: many recognition improvements for Latin and Cyrillic; fixed OCR replace list rules in 10 languages

Subtitle formats and export:
* SubRip reader rewritten: tolerant of damaged files, 2.6-12x faster; parser crashes found by fuzzing fixed
* Image-based export draws ASSA lines with their own style and many more ASSA tags (also in Batch convert and seconv)
* Blu-ray sup: HDR (BT.2020 PQ) palette option and smarter palette split
* Remux video: CEA-608/708 as SEI captions in .mp4, caption time offset for .scc/.mcc
* iTunes Timed Text export presets and header template

ASSA:
* ASSA draw: text and shapes, groups, in/out and loop animations, many new (also animated) clip arts
* CapCut-style "Apply advanced effect" gallery with six new caption effects
* Styles, properties, attachments, Set position and Set background redesigned; fonts from [Fonts] previewed

Tools and editing:
* Multiple replace works like SE4: categories, flat rule list with type-in row, "Add rules" window, edit in place
* Spell check: remove words from the dictionary; editable word list regex
* Batch convert: run batch-capable plugins, search box for functions, plain text options
* Get plugins: search box and a bigger window

Translations and engines:
* All language files synced with English; new Romanian and Croatian UI translations
* Updated engines: Crisp ASR v0.8.50, llama.cpp b12110, CrispEmbed v0.17.14, audio.cpp v0.9.4, Qwen3 ASR v0.1.11, yt-dlp 2026.10.26 and Avalonia 12.1.5

A big thank you to everyone who tested the pre-releases, reported issues and
contributed code and translations :)