Subtitle Edit (SE) is a free (open source) and powerful editor for video subtitles . With SE you can easily adjust a subtitle if it is out of sync with the video and much more. You can also use SE for making new subtitles from scratch (do use the time-line/waveform/spectrogram) or translating subtitles.

Features:

Create/adjust/sync/translate subtitle lines
Convert between SubRib, MicroDVD, Advanced Sub Station Alpha, Sub Station Alpha, D-Cinema, SAMI, youtube sbv, and many more (200+ different formats!)
Cool audio visualizer control – can display wave form and/or spectrogram
Video player uses DirectShow, VLC media player, or MPlayer
Visually sync/adjust a subtitle (start/end position and speed)
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 subtitles embedded inside .ts (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 Open Office dictionaries/NHunspell (many dictionaries available)
Remove text for hear impaired (HI)
Renumbering
Swedish to Danish translation built-in (via Multi Translator Online)
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

5.1.0 (29th of July 2026)

Subtitle Edit 5.1 is the first feature release after 5.0. A summary of the
changes since 5.0.0:

* 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 used in the development of this release 🙂

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