Software » Subtitle » Subtitle Edit 5.1.0 / 4.0.16

v5.1.0 (29th of July 2026)

Subtitle Edit 5.1 is the first feature release after 5.0, collecting the work of
15 betas and 18 release candidates. A summary of the changes since v5.0.0
(full details in the pre-release entries below):

* AI review (Tools > AI review) - proofread subtitles with a local LLM via llama.cpp or Ollama, with a before/after grid and an editable prompt
* AI assistant in the subtitle text box - quick actions like fix spelling/grammar, reading speed and change tone
* Auto-translate: new generic OpenAI-compatible engine, remote llama.cpp server option, DeepL formality picker, and many new local models (TranslateGemma, Gemma 4, Hy-MT2, Qwen 3.5/3.6, Aya Expanse)
* Auto-translate: retry with backoff on rate-limited (429) LLM engines, show the API URL in error details, and fix engines that ignored a custom URL
* Speech to text: new engines and models - MOSS-Transcribe-Diarize with speaker labels, OpenRouter and Alibaba Qwen3-ASR online engines, and Parakeet, Kyutai, SenseVoice, ARK-ASR and Cohere models - plus live progress for all CrispASR engines, and the input language is remembered again
* Text to speech: new MOSS-TTS engine with zero-shot voice cloning and a target language dropdown, new Q6_K/Q8_0 quants, a big window overhaul, and a large bug-fix pass across the engines and the review window
* OCR: new CrispEmbed local OCR engine (GLM-OCR, GOT-OCR2, Qwen3-VL), llama.cpp OCR vision models in Batch convert and seconv, a "Show only forced subtitles" filter, and histogram-based color isolation for VobSub/DVD subtitles
* New formats: EBU-TT-D (read/write), IMSC 1.1 image profile export, and "DVD sup (MuxMan/Scenarist)" image-based export
* macOS: multi-window support - "File -> New window" opens an independent editor window
* New "file saved" prompt with file info, copy path and Play/Open - used across text to speech and the video tools
* Waveform: SE4-style center/lock scrubbing (paused and while playing), configurable toolbar with seek and play buttons, drag a multi-line selection to shift time codes together
* Subtitle text box: new native tag-coloring text box - IME/CJK input, right-to-left and live spell check now work with color tags enabled
* Live spell check in the subtitle grid context menu, spell check window fixes, MS Word engine fixes, and new Georgian, Armenian, Luxembourgish and Faroese dictionaries
* Fix common errors: reworked fix list with category chips, sortable columns and live counts - and unticked fixes are no longer applied
* Shortcuts window: categories with icons, sortable columns, better search - plus many new SE4-parity shortcuts (column shortcuts, set start and go to next, play previous/next, extend, and more)
* Subtitle grid: type-a-number line navigation, alternating row colors, text fit setting (clip/wrap/ellipsis), and "Insert subtitle after current line..." keeping the inserted file's own time codes
* Auto-save of the open subtitle file (Options > General)
* Right-to-left: mirrored grid columns, content direction in text boxes, and an ASSA karaoke RTL option
* Accessibility: menu bar activation via Alt/F10, and named controls for screen readers across the app
* Image-based subtitle editor: PGS position monitor, adjust color for selected lines, change speed, and HTML index export
* Point sync and visual sync: sorted sync points, re-pointing, delete via menu/keyboard, and a time code box for the sync point
* Split/re-balance long lines: respect the single line max length
* Auto-trim white space: use the detected language, so Dutch keeps " 's"
* Network: always bypass the proxy for local (loopback) URLs, and proxy password/crash fixes
* Performance: non-English start-up about 3.5x faster, 10-25x faster auto line-breaking, much faster subtitle grid and waveform rendering, faster .srt/ASSA loading and MP4 parsing, and a wide allocation-cutting pass (source-generated regexes, reused StringBuilders) - thx ivandrofly
* Stability: hundreds of fixes, including a 46-bug codebase sweep, an async/await bug hunt, and hardened binary subtitle parsers
* Command line (seconv): llama.cpp auto-translate and OCR, image output styling options, fix-common-errors profile settings in --settings JSON, VobSub/.idx fixes, and clear errors on malformed SCC input
* The libse core library is now published on NuGet
* New UI languages: Arabic, Turkish, Persian, Traditional Chinese, Indonesian, Vietnamese, Greek and Thai - and all language files synced with English (3,000+ strings)
* Updated engines: CrispASR v0.8.24, llama.cpp b10142 (with a CUDA 13 build on Windows), whisper.cpp v1.9.1, CrispEmbed v0.16.1, Qwen3 ASR CPP v0.1.7 and yt-dlp 2026.07.04

A big thank you to everyone who tested the pre-releases, reported issues and
contributed code and translations - and a special thanks to Anthropic for
sponsoring a Claude subscription :)

v5.1.0-rc18 (28th of July 2026)

* Set sync point: add a time code box so the sync point can be typed directly (SE4 parity)
* Fix CrispASR text to speech freezing the app on every generation - thx subof
* Speech to text: point at the Model field when an OpenAI-compatible server rejects it - thx acc4github
* Surround only the selected text with music symbols - thx fraternl
* Fix common errors: flash "Analyzing..." on every re-scan - thx Davanix
* Restore the SE4 order of the two split items in the text box right-click menu - thx Chouu
* Fix truncated labels and narrow controls in two spell check dialogs - thx bovirus
* Fix the subtitle grid scroll bar paging past the cursor when holding the trough - thx ivandrofly
* Fill in the missing Dutch translations - thx Albertos22
* Update the Italian translation - thx bovirus
* Improve the Polish translation of the OCR embedded subtitles dialog - thx potplayer-fanpack

v5.1.0-rc17 (27th of July 2026)

* Update llama.cpp to b10142 and offer the CUDA 13 build on Windows
* Update CrispASR to v0.8.23 - fixes garbled/hung CosyVoice3, Qwen3-TTS and Zonos audio on the Vulkan build, and voice cloning now needs to be enabled in settings - thx CrispStrobe
* Add 4 Parakeet and 1 Kyutai speech-to-text model to the CrispASR engines
* MOSS-TTS: add a target language dropdown, so cross-lingual voice clones are no longer heavily accented - thx subof
* Fix CosyVoice3, VoxCPM2 and F5-TTS asking for a voice transcription the voice pack already ships, and fix ref-text cues being dropped when one was a substring of a word in another
* Speech to text: don't fail the Faster-Whisper model download when preprocessor_config.json is missing - thx oep42
* Speech to text: make online/OpenAI-compatible server failures readable, and send the audio file last - thx acc4github
* Restore type-a-number line navigation in the subtitle grid - thx SiriosDev
* Fix common errors: show a green check and "Nothing to fix" when a re-scan finds nothing - thx Davanix
* Fix auto-imported Matroska tracks staying "Untitled" until the first save - thx Davanix
* Keep the selected audio track when going fullscreen or undocking - thx routineCode
* Update the OCR fix replace list with new entries - thx diomed
* Update the French translation - thx Need74
* Linux/macOS: stop the app data folder from being resolved against the working directory - thx ivandrofly

v5.1.0-rc16 (26th of July 2026)

* Add Georgian, Armenian, Luxembourgish and Faroese spell check dictionaries
* Update the Qwen3 ASR CPP engine to v0.1.7 - fixes the discrete GPU (Vulkan) crash - thx HanRU01
* Auto-hide the mouse cursor in fullscreen video - thx Davanix
* Batch convert: let Delete remove the selected files - thx SiriosDev
* Batch convert: keep the ASSA settings between sessions - thx SiriosDev
* Fix script alignment desyncing on the second sentence in "Import plain text" align-via-speech-to-text - thx subof
* Fix Alt+drag killing all shortcuts, and run alignment shortcuts in the text box - thx torvchen
* MS Word spell check: check words in a range so the selected dictionary language is used, and recover a dead Word session - thx sergechaly
* Fix OCR "add to user dictionary" not advancing to the next word - thx Rumbah2
* Fix false-positive ¿que -> ¿qué accenting in the Spanish OCR fix list - thx fraternl
* Qwen3 ASR: report the exit code and suggest the CPU build when a GPU run crashes - thx HanRU01
* Performance: 10-25x faster auto line-breaking, faster .srt reading, waveform render and subtitle grid, and linear adjust-display-time/set-fixed-duration/remove-empty-lines

v5.1.0-rc15 (25th of July 2026)

* Add Indonesian, Vietnamese, Greek, and Thai UI translations
* Update llama.cpp to b10103
* Auto-translate via DeepSeek: turn off the new default thinking mode for instant translations again, and migrate the retired deepseek-chat/deepseek-reasoner model IDs - thx itallfelldown5241023
* Export plain text: word wrap the preview, and remember the window position and size - thx subof
* Apply the saved volume to all video player windows - thx CDoggyDog62
* Shortcuts window: darker category text in light mode, wider category column and button hints - thx GrampaWildWilly
* Subtitle grid menu: keep Styles/Actors at the top and move the dictionary picker down
* Allow Escape to close the source view window - thx ivandrofly
* Fix undo deleting all lines of the original subtitle in translation mode - thx abasameer
* Fix the MS Word spell check engine checking against Word's default language instead of the selected dictionary - thx sergechaly
* Fix AltGr shortcut handling racing with typing - thx Ironship
* Fix out-of-range parsing of culture names with unbalanced parentheses - thx ivandrofly
* Performance: micro-optimize hot UI helpers, and deserialize JSON directly from streams - thx ivandrofly
* seconv: fix VobSub OCR isolation, MKV VobSub passthrough, durations and silent drops - thx albino1
* seconv: fix dump-settings mangling non-ASCII characters on Windows - thx Hlsgs
* seconv: use canonical kebab-case flags...

Create/adjust/sync/translate subtitle lines
Convert between SubRib, MicroDVD, Advanced Sub Station Alpha, Sub Station Alpha, D-Cinema, SAMI, you-tube sbv, and many more (300+ different formats!)
Cool audio visualizer control - can display wave form and/or spectrogram
Video player uses mpv, DirectShow, or VLC media player
Visually sync/adjust a subtitle (start/end position and speed)
Audio to text (speech recognition) via Whisper or Vosk/Kaldi
Auto Translation via Google translate
Rip subtitles from a (decrypted) dvd
Import and OCR VobSub sub/idx binary subtitles
Import and OCR Blu-ray .sup files - bd sup reading is based on Java code from BDSup2Sub by 0xdeadbeef)
Can open subtitles embedded inside Matroska files
Can open subtitles (text, closed captions, VobSub) embedded inside mp4/mv4 files
Can open/OCR XSub subtitles embedded inside divx/avi files
Can open/OCR DVB and teletext subtitles embedded inside .ts/.m2ts (Transport Stream) files
Can open/OCR Blu-ray subtitles embedded inside .m2ts (Transport Stream) files
Can read and write both UTF-8 and other unicode files and ANSI (support for all languages/encodings on the pc!)
Sync: Show texts earlier/later + point synchronization + synchronization via other subtitle
Merge/split subtitles
Adjust display time
Fix common errors wizard
Spell checking via Libre Office dictionaries (many dictionaries available)
Remove text for hear impaired (HI)
Renumbering
Effects: Typewriter and karaoke
History/undo manager (Undo=Ctrl+z, Redo=Ctrl+y)
Compare subtitles
Multiple search and replace
Change casing using names dictionary
Merge short lines/split long lines
Export to PNG images (+bdn xml), Adobe Encore FAB image script, VobSub, Blu-ray sup, EBU stl, PAC, and plain text