AI subtitling
for professional media

Undertitle turns shows and films into professionally timed subtitles in more than 20 languages. Your subtitling standards and editorial rules are built in, while your editors keep final control.

Book a free demo
From master to subtitle in your language
Illustration of a broadcast screen, subtitle cards and a waveform

Measured results

82%
less handling time
80%
lower subtitle cost

Measured in a live production workflow.

Customer testimonial

“We have tested every solution under the sun. Undertitle is the first to truly deliver quality subtitles, resulting in real, massive gains for our editorial team.”
Head of Localization at a Flemish broadcaster

From source video to quality-checked subtitles in three steps.

  1. 1 A video master ready for subtitling

    Send your content

    Share a show, episode or film in your usual format.

  2. 2 Audio being transcribed and translated

    Undertitle creates the subtitles

    Undertitle combines transcription, translation, timing and segmentation and applies your professional subtitle rules.

  3. 3 Subtitles and quality report ready for editorial review

    Your editor reviews and decides

    Your editor receives the subtitles, flagged points of attention, a detailed quality report and an overall confidence score.

Watte V2

Unique transcription for Flemish dialect!

31.3% better dialect comprehension

A local language model built specifically to understand Flemish dialects better. Better source comprehension means better subtitles and less correction work.

Dialect comprehension comparison: Watte V2 scores 31.3 percent higher than Whisper.
West Flemish, Antwerp and Limburgish audio signals for Watte V2

Subtitle craft,
built in.

Generic AI recognizes words. Professional subtitling also requires the right timing, reading speed, segmentation, line breaks and terminology. Undertitle applies that craft alongside your tone and editorial rules.

Every delivery is checked against these rules. The result is recorded in the quality report.

Illustration of subtitle standards being checked

Your editors
stay in control.

Undertitle takes care of repetitive preparation, checks the subtitles against the agreed standards and shows which parts need extra attention.

Your editors review the delivery and make the final call, focusing their expertise where it makes the greatest difference.

Illustration of a subtitle quality report with an overall confidence score

See every subtitle
in context.

See the complete timeline and preview subtitles with the picture. Your editor can assess text, timing and continuity before delivery.

Undertitle editor with video preview, editable subtitles and audio waveform
The same selected subtitle appears in the picture, subtitle list and timeline.
See the complete timeline

The right format
for your next step.

Export subtitles in the format required by your editing, broadcast or publishing workflow.

SRT VTT WebVTT
Common video and web workflows
EBU STL PAC
Broadcast workflows
TTML ASS SSA
XML-based and styled subtitles
Export files in SRT, STL and PAC formats

Built around your workflow

From intake and processing to quality control and delivery, every project stays recognizable throughout the workflow.

Illustration of content flowing through Undertitle into reviewed subtitles

A clear project structure

Manage films, shows, seasons and episodes as one coherent production.

Projects

Source media, languages, runs and deliveries in one place.

New project

  • The Horizon

    Source
    English
    Target
    Dutch
    Updated
    Oct 28, 2026
    Latest run status
    Ready

  • Riverside · S2 E4

    Source
    English
    Target
    French
    Updated
    Oct 27, 2026
    Latest run status
    In production

  • The Copyist · S1 E2

    Source
    English
    Target
    German
    Updated
    Oct 26, 2026
    Latest run status
    In review

Use your own unique IDs

Custom fields keep every project recognizable across connected systems.

ContentID
MV-00123456
Original title
The Horizon
Distributor
Lumière Pictures
Version
International

Connect your media workflow via API

Connect Undertitle to MEDIAGENIX, OOONA or another professional media workflow, depending on your environment.

  • Projects
  • Media
  • Scripts
  • Runs

Find every production instantly

Search and filter by operational and custom metadata.

Search by title or ContentID…
  • Language
  • Type
  • Status
  • Date
  • Custom fields

Add scripts as context

Add screenplays and dialogue lists for names and terminology.

  • the-horizon-script.pdfPDF
  • dialogue-list.xlsxXLSX
  • terminology.txtTXT

Measure every delivery

Follow processing and measure subtitle quality before final review.

Quality report

842 subtitles

Collapse details
Subtitle duration P50: 2.3s · P95: 4.8s
0s8+s
Reading speed P50: 14 · P95: 19 chars/s
024+ chars/s
Line length P50: 31 · P95: 39 chars
042+ chars
Line split 842 subtitles
  • One line 68%
  • Two lines 32%

Built to scale with you

Undertitle runs on Kubernetes. Its infrastructure scales automatically with parallel productions, peak demand and growing volumes.

  • City Lights S1 78% Transcribing
  • The Horizon 100% Ready
  • Riverside S2 62% Translating

More than 20 languages. One professional workflow.

Reach more markets without building a new workflow for every language. Undertitle applies the same professional standards, editorial rules and quality checks across more than 20 languages.

  • English
  • Nederlands
  • Français
  • Deutsch
  • Español
  • Italiano
  • Português
  • Polski
  • Čeština
  • Slovenčina
  • Magyar
  • Română
  • Hrvatski
  • Slovenščina
  • Svenska
  • Dansk
  • Norsk
  • Suomi
  • Türkçe
  • Bahasa Indonesia
  • Eesti
  • Latviešu
  • Lietuvių

Questions,
answered.

The practical details your editorial and production teams usually want to know before a demo.

Ask us in a demo
01

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.

02

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.

03

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.

04

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.

05

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.

06

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.

07

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.

08

Can Undertitle follow our editorial rules?

Yes. Undertitle can apply your rules for terminology, tone and editorial exceptions alongside professional subtitling standards.

09

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.

10

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.

11

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.

12

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.

13

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.

See Undertitle on your own content.

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Explore the live demo Browse sample projects and completed runs. No account needed.

Xavier from Undertitle Hadewin from Undertitle