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We have powerful features that make captioning easy and quick.

Captioning services that are right up your alley

Best in class service

We aim to deliver best in class service to our clients irrespective of the client’s TAT and budget.

Certified professionals

Our certified professionals are responsible for the accurate delivery of captions

Fastest delivery

We never break our promise. We deliver your captions on time.

100% confidentiality

We safeguard your information with utmost care since we value our relationship more.

Easy way to caption your videos

Once you upload your media file to our captioning software, it starts generating the captions simultaneously.
Depending upon the file, you may receive the captions within few minutes or within few days in a wide variety of file formats.

How to use?

Step 1:- Upload your media file in our captioning tool
Step 2:- Our tool starts captioning your media automatically. Wait for some time.
Step 3:- Once the captions are done, you will receive the file and it also allows an option to download the transcript.
Step 4:- You can download the transcript in the format you need and click download.


Our captioning

We automate most of the captioning service and of course, we also do it manually for precise results. We provide accurate and perfectly timed captions in almost all file formats within, 12 hours, 24 hours or 48 hours depending on the file size.

Other language support

Our captioning tool provides a powerful and timely support to Latin American and European Spanish languages at a reasonable price. Upload your media and receive the well-segmented captions within few minutes. We provide automated captions as well as manually produced captions.


In addition to captioning, we provide human transcription which is of 98% accuracy. We offer high-quality transcription at an affordable rate with exact capturing of each word the speaker speaks.


Our tool allows the input of various file formats and customizes the outputs. This allows the easy edit of texts and timing.

High degree of confidentiality

The media file is stored in the cloud. This provides a safe and secured workplace with a high degree of confidentiality. Only the professionals associated with the captioning service can access the file.

Individual or an Enterprise

Installing our captioning software is easy and doesn’t require any tedious process. If you believe, you can create it within minutes. Moreover captioning for an Enterprise is an ideal choice for organizations since it supports consolidated billing, shared access to projects, tools, offline payment options, and special volume rates. The services are charged privately via credit card option.
For individual captioning needs we offer flexible TAT and pricing options.

Input file Formats

Uploading the input file:

Upload your audio or video file and WordCaptions will automatically detect the codec and file type and prepares it for synchronization. We accept a huge range of audio and video file types, allowing uploads of file size up to 5GB. This considerably saves your time and effort spent on individually converting them before submitting to us. Some commonly supported formats include:

MP4Moving Picture Experts Group
M4VThe M4V file format is a video container format developed by Apple and is very similar to the MP4 format.
WMVWMV is generally packed into the ASF container format
MOVA MOV file is a common multimedia container file format
FLVFlash Video is a container file format used to deliver digital video content
AVIAudio Video Interleave
3gp3GP is a multimedia container format
MPGAn MPG file is a common video file that uses a digital video format standardized by the Moving Picture Experts Group (MPEG).
OGGOGG is a free, open container format
MP3MP3 is an audio coding format for digital audio.
AACAdvanced Audio Coding Format
WAVWaveform Audio File Format
AIFFAudia Interchange File Format
WMAWindows Media Player

Attaching your file’s transcript

Upload the transcript of the submitted file in any one of the following file formats:

  • TXT (Notepad)
  • DOC (Word)
  • DOCX (Word)
  • ODT (Open Office)

We also provide you with an option to directly paste your transcript into ‘WordCaptions’ tool or we can even compose the transcript for you if needed.

Embed the caption files:

You can also try uploading an SCC or SRT caption file in place of a transcript. Such customers who have SCC or SRT files in hand and require re-timing can upload these files and WordCaptions will re-time the file preserving the styling, segmentation, and positioning of the captions. This way, WordCaptions helps its customers save a significant amount of time and effort who already possess captioned files in hand.

Generated output file formats:

Captioned output files:

WordCaptions produces caption files that can be used for DVD authoring, broadcasts and many more. Here is the list of formats in which the captioned files are generated:

.SRTPopular caption file format
.WebVTTThe new W3C standard for captioning in HTML5.
.SBVSubViewer file format.
.DFXPW3C standard for captioning, used widely in Flash players
.SMISAMI captions for Windows Media Player.
.QTQuickTime captions.
.RTRealText captions for RealPlayer.
.SLTSpruce subtitle format for DVD Studio Pro.
.SUBCaptions for Sonic DVD Creator.
.SMPTE-TTThe FCC safe harbor format for IP captioning. Similar to DFXP.
.SCCScenarist Closed Caption format.
AVID SSSubtitle format supported by Avid systems.
JSONWord-level timing and confidence data.
MULTILUNGUAL .DFXPMultilingual DFXP file generated via machine translation. Translation into multiple languages is available. Available to enterprise customers.

Flexibility to alter caption files:

WordCaptions offers the flexibility to customize your caption files. At first, simply choose the number of lines and characters per line in your caption files. Then, style your captions by setting various options such as the font type, font colour, background colour, and placement. You can also use more advanced options such as enforcing caption separation or offsetting the start time of your caption file.

Acceptance of time-stamped transcripts:

  1. as a Text (.txt) file
  2. in Word (.docx)
  3. as a PDF

Time-stamped transcripts feature timings on important time frames during which speaker changes or the paragraph breaks happen. Here it is to be mentioned that segmented time-stamped transcripts are very useful as readable caption files. You can also download the original transcript from WordCaptions, exclusively created for you.

Extended support for other customized file formats:

If your caption file format is missing from the available list, feel free to contact us for specially adding it for you at no extra cost.

Human transcribers or machine generated transcripts? CaptioningStar offers you the best of both worlds. We offer you a blend of professional expertise and technology.

Human Transcription

CaptioningStar is well known for its professional transcribers who have the ability to produce 99.8% accurate transcripts. The transcribers capture every single word the speaker speaks with proper punctuation and sound cues.


CaptioningStar offers verbatim transcripts excluding the ums, ahs, false starts and repetitive words. We follow the Chicago Manual of style for transcription


When you request for a transcript, CaptioningStar allows you to provide guidance to the transcriber working on your media. You can include notes with some special considerations or conventions you would like the transcribers to follow. You can even upload files that you think might help the professionals, which may include specialized vocabulary, speaker names and other information.

Experience/Skill Set

CaptioningStar is endowed with highly experienced transcribers who have worked with multiple ranges of content. We have experience in the educational domain, broadcast, and film. Furthermore, we have transcribed 100s of hours of events, conference calls, podcasts and other diverse material.

Machine Generated Transcripts

Using automatic speech recognition (ASR), Cstar produces transcripts within few minutes. What you have to do is, just upload the transcripts, make your quick edits and re-upload it to simultaneously generate captions.

You can simply upload your media, select the ASR option and get your transcripts ready within minutes.

Review Tool

CaptioningStar allows a simple way to review and to make necessary edits to the captions provided by the software. The words in the transcript are highlighted to sync with the audio content. This tool identifies and displays the exact part of speaker labels and sound cues to the users.

With this review tool, you can edit the texts as well as the timing. Easy to understand start and end anchors to text and sound cues, makes timing adjustments a breeze. CaptioningStar instantly re-syncs according to the edits made.

Spectrogram and playback features

A spectrogram allows you to visualize the audio, which makes it effortless to distinguish human speech against other audio sounds. This helps in precisely placing the anchors.

If the user finds the playback rate is too fast or too slow, we allow the user to adjust the playback rates. The users can also jump to points on the audio timeline, or navigate by double-clicking on the particular word in the transcript.

Confidence data

With Review tool, confidence data is displayed as a visualization that is layered over the transcript so that the users can quickly spot the sections that require review and editing.

What if you want to make some changes to the captions or edit some changes to your delivered transcript? At the nick of the moment, you can’t depend on anyone other than yourself.

Our team views the difficulties from your point of view and thus came the ‘Review tool’. With our Review tool, your task of making changes or editing becomes super easy.

CaptioningStar updates your changes in short order to maintain the quality of the transcript.

Text Edits

Include text, remove or make edits to your transcript. You can easily search for the words you want to edit.

Speakers and Cues

CaptioningStar analyzes your transcripts smartly and identifies the portions that include spoken data and audio sounds in the media. You can adjust, and make changes to these labels and underlying text very easily.

Timing Edits

With CaptioningStar, you can make changes to the time and edit it to any word in the transcript. Just select the word you want to adjust, set the start or end time of the word in the audio.

You can zoom in with the waveform available and with the buttons you can preview the audio around the point you choose to edit.

Level of confidentiality

We maintain confidentiality with our client’s information. We ensure you that, we, including the transcribers and staff, have signed the confidentiality agreements and follow the established procedures.

We make sure that your information is given top-level security.

Secure Tools

CaptioningStar provides a safe and secured platform. We force all the traffic over HTTPS with powerful 256-bit encryption for all transactions.

We use very strong passwords and safeguard the password reset procedures. To add another layer of security, our payment processing is PCI compliant.

We are in the cloud!

CaptioningStar’s engine runs in the cloud. So we can access our files easily in a more powerful and secure way

Application Programming Interface

CaptioningStar’s engine reveals all its powerful features through a more protected and restful API.

We make our clients to smoothly integrate Cstar functionalities into their systems and workflows. With API, you can submit projects, retrieve captions, request for services like transcription and ProSync, delivers status notifications via callbacks.

The Enterprise Customers can request for CaptioningStar API.

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