Advanced Subtitle Creation and Editing Solutions. The Stellar Suite empowers all subtitling professionals to streamlining their workflows through cutting-edge technology. Experience enhanced productivity and creativity with tools built to meet the demands of modern media localization and accessibility.
Work in all formats, all languages for all workflows, The Stellar Suite supports subtitle and caption authoring, editing, translating, retiming, conforming and converting.
The Stellar Suite for Subtitling
Harness the Power of AI-Driven Tools for Efficient Subtitling
Stellar Suite for Subtitling combines professional subtitle creation and editing tools with cutting-edge AI web services. Leverage the latest in speech-to-text, text alignment and machine translation technologies to speed up your subtitling process.
Create or Import Subtitles
Craft high-quality subtitles and captions faster with Stellar’s professional-grade toolset—designed for precision, flexibility, and multilingual workflows.
Flexible Authoring Options
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Start from scratch or import existing subtitle files or scripts
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Edit directly in industry-standard formats including .srt, .stl, .itt, and more
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Seamlessly convert between all major subtitle file types
Advanced Editing & Timing
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Fine-tune timing and positioning with frame-level accuracy
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Auto-align scripts to audio using AI-driven tools for faster syncing
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Preview subtitles in real-time with full video playback and sync
Smart Automation & Multilingual Support
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Accelerate workflows with integrated Speech-to-Text (ASR) services
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Use Machine Translation (MT) to streamline multilingual subtitling
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Built-in support for multi-language spell checking and QA tools
Powerful Subtitle & Caption Editing
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Edit with confidence – view subtitles directly over video, as text blocks, and on the timeline
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Full suite of editing tools for timing, text, and structure
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Adjust timing with frame-level accuracy
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Easily split, merge and insert subtitles – text or timeline based
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Built-in spell checkers for all major languages
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Precise positioning & justification – vertical and horizontal controls at your fingertips. Set timecodes with hotkeys, drag handles, or precise mouse control.
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Format your style – support for Open, DVB, Teletext, and Closed Captions
- Quick-conform shortcuts to sync subtitles with video edits
Built for professionals who need flexibility, speed, and total creative control.
Multi-Language Support
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Supports virtually all languages and script systems worldwide
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Work with multiple language files side by side — all in one project
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Check and sync timing across languages with ease
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Conform all versions simultaneously to match video edits
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Powerful retiming tools make global versioning fast and stress-free
Deliver accurate, synchronized subtitles in every language — faster than ever.
Templates & QC Tools
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Ready-to-use templates for subtitle layout, styling, and timing rules
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Centralized template management – update once, apply everywhere
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No more sending files – templates are instantly available to all users
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Assign multiple templates with powerful, flexible control for different formats or clients
Streamline your workflow, maintain brand consistency, and deliver with confidence — every time:
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Automated QC tools for fast, accurate file checks
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Live error flagging in both editor and status reports
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Filter issues by error type or severity
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Use custom, template-based QC rules to meet project standards
Subtitle Review
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Review subtitles in perfect sync with video
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Smart “Review Play” skips silent gaps for faster playback
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Visual subtitle overlay on video for instant feedback
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Generate status reports with detailed stats
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Create screeners with burnt-in subtitles for client review
- Tagging tool let reviewers flag issues such as readability, profanity, or market-specific restrictions
Video Playback
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Supports all major video formats and aspect ratios
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Full playback control via hotkeys or mouse
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Frame-accurate stepping with audio scrubbing
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Variable playback speed: from 0.25x to 1000x real-time
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Designed for fast, intuitive navigation—even on longform content
- Shot-change track for accurate subtitle alignment and navigation
Program Audio
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Handle up to 8 audio tracks (mono, stereo, or a mix)
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Individual mute and level control for each track
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Audio scrub available on all tracks
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Visual waveform display on the timeline for easy navigation
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Click-to-jump directly from the waveform to your desired cue point
AI-Powered Tools
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Auto-transcribe audio with cutting-edge speech-to-text – create subtitles or transcripts in seconds
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Turn untimed scripts into timed subtitles using AI-powered alignment
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Generate draft translations instantly with machine translation
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Speed up QC – use machine translation to quickly verify subtitle content across multiple languages
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Detect on-screen text like captions or banners and automatically reposition your subtitles for perfect readability
Save time, boost accuracy, and let AI handle the heavy lifting — so you can focus on the creative.
Subtitle File Export
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Convert subtitles to/from all major formats (broadcast, web, digital cinema)
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Full control with configurable format conversion options
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Export directly to cloud storage or local destinations
Certified Security
The Stellar Suite is protected by TPN Gold Shield certification, meeting the highest industry standards for media security.
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Advanced encryption (MediaSeal) keeps your content protected at all times
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Industry-standard DRM (Widevine) ensures secure digital rights management
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Watermarking and two-factor authentication add layers of defense
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Audit trail access gives you full transparency and control over your media
Stellar Suite keeps your content safe — from production to delivery.
The ultimate solution for seamless, precise and efficient subtitle creation and editing.
Watch our comprehensive video to see how Stellar makes localization faster, smarter and more cost-effective than ever before. Discover the power of an single integrated, secure, intuitive, browser-based tool.
Unleash Creative Potential, Minimize Operational Hassle
Revolutionizing Creative Workflows with Stellar
Stellar has a flexible design to address the different challenges faced by freelancers, language service providers, content owners and broadcasters. Discover The Stellar Suite benefits:
Browser-based and always up to date
Cloud access from any computer.
Stellar is a browser-based solution that needs no costly equipment and runs on Mac and PC.
Enjoy a seamless user experience that includes all enhancements, automatically.
Management and progress overview
The Stellar Suite provides a single portal for managing and tracking all your projects. Manage tasks, media, users and project data in the one system. See the status of all work in progress and highlight bottlenecks and deadlines.
Integrated Rules Based QC tools
Centralized Style Profiles define all the client requirements for caption, subtitle, and AD deliverables. Rules based QC system simplifies complex subtitle file correction and editing with auto-correct options. Reduce rejects with up front checks.
Central storage of Style Profiles removes confusion and human errors.
AI-assisted innovation to empower humans
The Stellar Suite integrates with the best available AI services for speech-to-text, machine translation, synthetic voices, voice morphing and dialogue removal. Let AI do the heavy lifting, so humans have space to be more creative and productive.
Convert file formats, all languages
The Stellar Suite supports all file formats, all languages and all writing systems including the new IMSC Rosetta subtitle file format created for the industry by Warner Brothers Discovery and Yella Umbrella.
Flexible pay-per-use model
Enjoy cost-effective usage model that aligns with your workload.
The Stellar Suite’s flexible pricing model ensures you only pay for the days you use the software. If you don’t use it, you don’t pay. No more financial headaches for freelancers with fluctuating projects and smaller businesses on tight budgets.
Add user at any time with no limitation. Scale up or down instantly with no cost, just pay for what you use per day.
Single integrated system
The Stellar Suite provides a single integrated system with all the tools you need for all deliverables. One system for subtitles, captions, transcripts, audio description, spoken subtitles, voice-over and lip-sync dubbing.
It simplifies your work by automating routine tasks and keeping everything centralized on a single platform.
Save valuable time and reduce manual errors through effortless project management with progress tracking and easy client communications.
Industry leading security
The Stellar Suite is secured with industry standard TPN Gold Shield certification. Your clients’ content is totally safe when you use The Stellar Suite. Track media access to provide a secure audit trail.
The Stellar Suite offers multiple media security methods: watermarking, two-factor authentication, full industry standard digital rights management (Widevine DRM) and encryption (MediaSeal) support to make sure your data is always secure.
Real-time collaboration
Enhance collaborative quality and improve communications.
Stellar ensures all users and freelancers can collaborate on projects in real time, regardless of their geographical location. Features include shared workspaces, live editing and instant feedback.
Track progress and outstanding errors in real-time.
Save time in collaborative projects by streamlining revisions and ensuring clear communications with clients, staff and freelancers.
Resource planning and cost tracking
The Stellar Suite provides an overview of workloads and resources so you can be sure deadlines will be met. See time spent and associated costs per project, user or client.
Professional customer support
Yella Umbrella provide a range of support options covering software support, operations, IT and media services. Ask for more information
Revolutionizing Creative Workflows with Stellar
Stellar has a flexible design to address the different challenges faced by freelancers, language service providers, content owners and broadcasters. Discover The Stellar Suite benefits:
Browser-based and always up to date
Cloud access from any computer.
Stellar is a browser-based solution that needs no costly equipment and runs on Mac and PC.
Enjoy a seamless user experience that includes all enhancements, automatically.
Management and progress overview
The Stellar Suite provides a single portal for managing and tracking all your projects. Manage tasks, media, users and project data in the one system. See the status of all work in progress and highlight bottlenecks and deadlines.
Integrated Rules Based QC tools
Centralized Style Profiles define all the client requirements for caption, subtitle, and AD deliverables. Rules based QC system simplifies complex subtitle file correction and editing with auto-correct options. Reduce rejects with up front checks.
Central storage of Style Profiles removes confusion and human errors.
AI-assisted innovation to empower humans
The Stellar Suite integrates with the best available AI services for speech-to-text, machine translation, synthetic voices, voice morphing and dialogue removal. Let AI do the heavy lifting, so humans have space to be more creative and productive.
Convert file formats, all languages
The Stellar Suite supports all file formats, all languages and all writing systems including the new IMSC Rosetta subtitle file format created for the industry by Warner Brothers Discovery and Yella Umbrella.
Flexible pay-per-use model
Enjoy cost-effective usage model that aligns with your workload.
The Stellar Suite’s flexible pricing model ensures you only pay for the days you use the software. If you don’t use it, you don’t pay. No more financial headaches for freelancers with fluctuating projects and smaller businesses on tight budgets.
Add user at any time with no limitation. Scale up or down instantly with no cost, just pay for what you use per day.
Single integrated system
The Stellar Suite provides a single integrated system with all the tools you need for all deliverables. One system for subtitles, captions, transcripts, audio description, spoken subtitles, voice-over and lip-sync dubbing.
It simplifies your work by automating routine tasks and keeping everything centralized on a single platform.
Save valuable time and reduce manual errors through effortless project management with progress tracking and easy client communications.
Industry leading security
The Stellar Suite is secured with industry standard TPN Gold Shield certification. Your clients’ content is totally safe when you use The Stellar Suite. Track media access to provide a secure audit trail.
The Stellar Suite offers multiple media security methods: watermarking, two-factor authentication, full industry standard digital rights management (Widevine DRM) and encryption (MediaSeal) support to make sure your data is always secure.
Real-time collaboration
Enhance collaborative quality and improve communications.
Stellar ensures all users and freelancers can collaborate on projects in real time, regardless of their geographical location. Features include shared workspaces, live editing and instant feedback.
Track progress and outstanding errors in real-time.
Save time in collaborative projects by streamlining revisions and ensuring clear communications with clients, staff and freelancers.
Resource planning and cost tracking
The Stellar Suite provides an overview of workloads and resources so you can be sure deadlines will be met. See time spent and associated costs per project, user or client.
Professional customer support
Yella Umbrella provide a range of support options covering software support, operations, IT and media services. Ask for more information
Stellar Insights
Explore the Pulse of Media Production
Explore the Pulse of Media Production
Testimonials
Discover what our clients have to say
Discover what our clients have to say
'We have worked with Yella Umbrella for several years on analysing and processing our extensive subtitle archive. As we move to a new streamlined system, we have integrated The Stellar Suite to support our growing content needs. We use Stellar to conform multiple languages in a single session, create subtitles, perform automated subtitle conversions, and retime existing subtitle files. These capabilities have allowed us to maintain high quality standards while improving efficiency. This balance between automation and editorial control is exactly what we need'
Vice President of Technical Operations, Global Technology at BBC Studios
“We wouldn’t have been able to complete this intricate AD project without the shared task capabilities in Stellar. It simplified version control, enabled real-time QC, and allowed feedback without endless file sharing. It also keeps assets secure since only the project is shared, not the high-res media files.”
CEO, Hear Say AD
At Vertala (TVT Media), we use Yella Umbrella’s Stellar Suite to manage and streamline our subtitling workflows across a wide range of projects and clients. The platform supports efficient, accurate, and flexible subtitle creation, review, and delivery across our output, including multiple Asian languages. Stellar’s tools have helped us maintain high quality standards while scaling to meet demanding turnaround times. Throughout our collaboration, the Yella team has been consistently helpful and responsive, offering expert support and adapting quickly to our evolving needs.
CFO at Vertala (TVT Media)
At Broadcast Intelligence, we rely on Yella Umbrella’s Stellar Suite to handle both the creation of new subtitles and the conforming of existing subtitle files across diverse projects and clients. The platform allows us to deliver accurate, consistent subtitles efficiently, even under tight deadlines. Using Stellar has enabled us to uphold rigorous quality standards while managing increasing volumes of work. The Yella team has been an excellent partner throughout—knowledgeable, approachable, and quick to respond as our requirements evolve.
COO at Broadcast Intelligence
As a freelance translator, Stellar has revolutionized the way I work. Its intuitive design and powerful features have significantly reduced my project turnaround times.
Freelance translator at Copy2U
Contact us
Office
Aarschotsestraat 87,
1800 Vilvoorde