About Subtitle Edit

A free, open-source subtitle editor that handles over 300 formats and has quietly become one of the most trusted tools for subtitlers, translators, and accessibility professionals around the world.

How It Started

Subtitle Edit grew from a single developer’s side project into a tool used by millions. Here is how that happened.

2008 – 2009
The first lines of code. Nikolaj Lynge Olsson, a developer from Denmark, started building Subtitle Edit as a .NET desktop application for Windows. He needed a subtitle editor that actually worked well — and nothing on the market quite fit, so he built his own.
Early 2010s
Word of mouth in fansubbing communities. Fan translators working on anime, foreign films, and TV series discovered the tool and started recommending it to each other. No marketing budget, no press releases — just people telling other people about software that actually worked.
Mid 2010s
300+ format support. As users reported new subtitle formats they needed, Nikolaj kept adding them. SRT, ASS, SSA, VTT, MicroDVD, D-Cinema, Blu-ray SUP — the format list grew until Subtitle Edit supported more formats than any competitor, free or paid.
Late 2010s
Professional adoption. Subtitle Edit moved past its fansub roots. Professional subtitling houses, broadcast teams, and accessibility departments started using it as their daily driver. The visual waveform sync and OCR features made it competitive with expensive commercial tools.
2020s
AI transcription arrives. Integration with OpenAI Whisper brought automatic speech-to-text directly into the editor. Users could now generate subtitles from audio, then fine-tune timing and text — all inside one application.
2024 – 2026
Version 4.x and cross-platform. The release of version 4.0 brought a modernized interface, improved performance, and Avalonia UI support for Linux and macOS. What started as a Windows-only tool now runs on all three major operating systems.

What Subtitle Edit Does

More than just a text editor for subtitles. It covers the full workflow from transcription to final export.

300+ Subtitle Formats

Read and write SRT, ASS, SSA, VTT, SUB, MicroDVD, D-Cinema, Blu-ray SUP, and hundreds more. Convert freely between any of them.

AI Transcription

Generate subtitles from audio using OpenAI Whisper. Supports dozens of languages with automatic speech recognition built right in.

Visual Waveform Sync

Align subtitle timing using an audio waveform and spectrogram display. Drag timing points visually instead of guessing at milliseconds.

OCR for Image Subtitles

Extract text from image-based DVD and Blu-ray subtitles using Tesseract OCR. Convert bitmap subtitles to editable text formats.

Auto-Translation

Translate subtitle files through Google Translate, DeepL, or Microsoft services. Useful for creating first-draft translations to refine by hand.

Multi-Language Spell Check

Catch typos and grammar mistakes using OpenOffice dictionaries. Supports dozens of languages for professional-quality subtitle text.

Batch Conversion

Convert entire folders of subtitle files from one format to another in a single operation. Set encoding, frame rate, and offset adjustments in bulk.

Compare Subtitles

Open two subtitle files side by side and spot differences in timing, text, or formatting. Helpful for QA checks and translation review.

The Developer

One person built and maintains a tool used by millions. That deserves some recognition.

Nikolaj Lynge Olsson

Independent Developer • Denmark

Known in the community as “Nikse,” Nikolaj has been the primary developer behind Subtitle Edit since its first release. He maintains the project on GitHub, responds to bug reports and feature requests, and ships regular updates — all as an independent developer, not a company.

The project is licensed under GPL v3, which means anyone can use, modify, and distribute it freely. That decision to keep Subtitle Edit open source has allowed it to grow far beyond what any single developer could market or distribute alone.

17+ Years Active
GPL v3 License
4.0.15 Latest Version
300+ Formats

Who Uses Subtitle Edit

From hobbyist fansubbers to broadcast professionals, the user base is broader than you might expect.

Fansubbers

Translating anime, foreign TV, and movies for global audiences

Professional Subtitlers

Closed captioning teams and localization studios

Video Editors

Content creators adding subtitles to YouTube and social videos

Accessibility Teams

Making content available for deaf and hard-of-hearing viewers

Independent Filmmakers

Film festivals and indie projects needing multi-language subs

Educators

Captioning lectures, training materials, and online courses

About This Website

A quick note about who we are and what this site is for.

Independence Notice

subtitleedit.org is an independent, community-run website. We are not affiliated with, endorsed by, or connected to Nikolaj Lynge Olsson or the official Subtitle Edit project in any way.

Our goal is straightforward: provide a clean, helpful resource where people can learn about Subtitle Edit, find accurate information about its features and system requirements, and access links to the official download sources.

We always link to the official sources for downloads and support. For the original project, visit nikse.dk or the GitHub repository. We respect the developer and the open-source community that makes Subtitle Edit possible.

Get in Touch

Have a question about this website or found something that needs correcting?

You can reach us through our Contact page. We do our best to respond within a few days.

For technical support with Subtitle Edit itself, we recommend heading to the GitHub Issues page or the official site at nikse.dk where the developer is active and responsive.