# Undertitle > Undertitle turns shows and films into professionally timed subtitles in more than 20 languages. Each file follows professional subtitling standards and your editorial rules. Your editors keep the final say. Undertitle is a product of ThinkTank (Think-Tank BV), Mezenstraat 80, 3061 Leefdaal, Belgium. Contact: hello@undertitle.ai ## Canonical page - [Undertitle](https://undertitle.ai/be-en) - [Subtitle glossary](https://undertitle.ai/be-en/glossary) - [Team](https://undertitle.ai/be-en/team) ## Product facts - Built for: broadcasters, streamers, distributors and localization teams - Subtitle languages: more than 20, including English, Dutch, French, German, Spanish, Italian, Portuguese, Polish, Czech, Slovak, Hungarian, Romanian, Croatian, Slovenian, Swedish, Danish, Norwegian, Finnish, Turkish, Indonesian, Estonian, Latvian and Lithuanian - Content types: shows, episodes and films - Workflow structure: projects keep source media, languages, processing runs and deliveries together - Custom identifiers: fields such as a MEDIAGENIX Content ID remain linked throughout the workflow - Built-in checks: reading speed, timing, line breaks, segmentation, terminology, tone and editorial exceptions - Delivery: subtitle files, a detailed quality report, flagged exceptions, and an overall confidence score - Output formats: SRT, WebVTT (VTT), EBU-STL, PAC, TTML, ASS and SSA; SCC is available on request - Editorial control: editors review the report and make the final call - Integrations: API connection to MEDIAGENIX and other media workflow tools, scripts for repeatable tasks, plus Undertitle’s own interface - Scale: parallel processing runs on Kubernetes infrastructure and can scale with production load - Measured in a live production workflow: 82% less handling time and 80% lower subtitle cost. These figures describe that specific workflow and are not a guarantee for every production. ## FAQ ### What does Undertitle do? Undertitle turns shows and films into professionally timed subtitles in more than 20 languages. It combines transcription, translation, timing and professional quality checks before sending the subtitles to your team for final review. ### Is Undertitle a transcription or captioning tool? No. It is built for professional subtitling, with rules for reading speed, timing, line breaks, segmentation and terminology. ### How does Undertitle handle Flemish dialects? Watte V2 is our own local language model for Flemish dialect transcription. In our comparison, it understands dialect 31.3% better than Whisper, giving editors a more accurate source transcript to start from. ### Can the subtitles be published without review? Every delivery still goes through final editorial review. Undertitle prepares the subtitles and shows editors where their attention is needed. Your team decides what gets approved. ### What does the editor receive? Editors review subtitles with the picture and across the complete timeline. They also receive the subtitle files, a detailed quality report, flagged exceptions and an overall confidence score. ### What does the quality report check? The report checks the subtitles against the agreed standards for reading speed, timing, line breaks, segmentation and terminology. Any exceptions that may need editorial judgement are clearly marked. ### What does the confidence score mean? The overall confidence score gives editors a quick indication of the delivery’s quality. They can then use the detailed report to find the subtitles or standards that need a closer look. ### Can Undertitle follow our editorial rules? Yes. Undertitle can apply your rules for terminology, tone and editorial exceptions alongside professional subtitling standards. ### Does Undertitle replace subtitle editors? No. Editors remain responsible for final review and approval. Undertitle takes care of the preparation work, including transcription, translation, timing and quality control. This can sharply reduce editorial handling in a live production workflow. ### Which languages and export formats does Undertitle support? Undertitle delivers subtitles in more than 20 languages. Available source and target language combinations depend on your workflow. Export formats include SRT, VTT, WebVTT, EBU STL, PAC, TTML, ASS and SSA. We confirm the exact language combination and required export format during the demo. ### How much time and cost can Undertitle save? A live production workflow measured 82% less handling time and 80% lower subtitle cost. These figures describe that specific workflow and are not a guarantee for every production. ### How does Undertitle fit into our existing workflow? Undertitle is built for broadcasters, streamers, distributors and localization teams. Its API can connect to MEDIAGENIX, OOONA and other professional media workflow tools, depending on your environment. Teams can also use Undertitle’s own interface to upload material, access completed deliveries and download subtitle files and quality reports. ### How does Undertitle pricing work? Pricing is based on a flat rate per minute of source content. That rate covers transcription, translation, timing, quality checks, the subtitle files and the quality report. For ongoing volumes or workflow integrations, we agree the setup in advance. ## Blog ### AI subtitling vs manual subtitling: the final edit stays. AI can take over a lot of subtitle preparation. The last pass still needs a person. What that means for teams that buy or run subtitling, and what the Undertitle report shows the editor. Key point: AI can prepare a subtitle file. A person still makes the final edit. For now, that step stays. - [AI subtitling vs manual subtitling: the final edit stays.](https://undertitle.ai/be-en/blog/ai-subtitling-vs-manual-subtitling) ### Subtitle Segmentation: When One Subtitle Becomes Two For subtitle editors and localization teams at broadcasters in Belgium: when the next words belong in a new subtitle, where the guides you deliver against put that split, and why a line break inside one subtitle is a different choice. Key point: A subtitle ends where a unit of meaning ends, ideally the sentence and otherwise the clause. It does not end where the line runs out of room. - [Subtitle Segmentation: When One Subtitle Becomes Two](https://undertitle.ai/be-en/blog/subtitle-segmentation) ### Open vs Closed Captions: What Is the Difference? Closed captions can be switched off by the viewer. Open captions are part of the picture. What captions for deaf and hard-of-hearing viewers contain, and how a translation differs. Key point: Closed captions appear only when the viewer turns them on. Open captions are embedded in the picture and cannot be turned off. - [Open vs Closed Captions: What Is the Difference?](https://undertitle.ai/be-en/blog/subtitling-vs-captioning) ### Reading Speed in Subtitles: How Many Characters per Second Can a Viewer Read? A guide for localization, quality control, and broadcast teams: what reading speed measures, what two research texts found, which limits broadcasters and platforms publish, and how to set your own target. Key point: A fast subtitle takes time away from the picture. How much that costs the viewer is not settled. Pedersen writes that at 16.5 characters per second viewers must choose between subtitles and action. Szarkowska and Gerber-Morón found no loss of comprehension at 20 characters per second. - [Reading Speed in Subtitles: How Many Characters per Second Can a Viewer Read?](https://undertitle.ai/be-en/blog/reading-speed-in-subtitles) ### Why Word Error Rate Is the Wrong Measure for Subtitles Word error rate scores how closely recognized words match a reference transcript. Broadcast subtitles are judged on reading time, line length, line breaks, and timing to the picture, so the score cannot tell a buyer whether the subtitles work. Key point: An edited subtitle differs from the transcript on purpose. Scored against a verbatim transcript, every word the editor removed counts as a deletion. Word error rate cannot tell a careful edit from a word the system lost. - [Why Word Error Rate Is the Wrong Measure for Subtitles](https://undertitle.ai/be-en/blog/word-error-rate-is-the-wrong-subtitle-measure) ### European Accessibility Act: Subtitle Compliance Guide A guide to the European Accessibility Act for broadcasters and streamers in the European Union: who is covered, what it asks of subtitles, which dates matter, and how to keep up at scale. Key point: The European Accessibility Act decides how subtitles must reach the viewer. Your country's rules under the Audiovisual Media Services Directive decide how many programmes need them. - [European Accessibility Act: Subtitle Compliance Guide](https://undertitle.ai/be-en/blog/european-accessibility-act-subtitle-compliance) ### A transcript is not a subtitle. A transcript records speech. A subtitle is a readable on-screen event with timing, line, and reading limits. This explainer is for people who commission timed text, not for people who export SRT from speech-to-text. Key point: Live AI transcript tools wrap speech-to-text models. They do not write a subtitle. The model underneath is the product, from houses such as Meta (Muse Voice Transcribe), OpenAI, Google Cloud Speech-to-Text, and others. A wrapper can stream words and export a subtitle file. That file is still a transcript with times. - [A transcript is not a subtitle.](https://undertitle.ai/be-en/blog/a-transcript-is-not-a-subtitle) ## Related - [Blog](https://undertitle.ai/be-en/blog) - [ThinkTank](https://think-tank.io): parent company - [Team](https://undertitle.ai/be-en/team): Xavier Decuyper (Co-founder) and Hadewin Naesens (Co-founder) - [Subtitle glossary](https://undertitle.ai/be-en/glossary) - [Privacy Policy](https://undertitle.ai/be-en/privacy) - [Terms](https://undertitle.ai/be-en/terms)