Everything you need to know about Fluen Studio.
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Fluen Studio supports essentially any playable video file, including common formats like .mp4, .mov, .m4v, .mkv, and .avi. For audio files, Fluen Studio is compatible with formats such as .mp3, .wav, .aac, .flac and .m4a. Each file can be up to 25 GB.
Fluen Studio currently supports 60 languages for both captioning and subtitle translation. You can translate from and into the following languages, with automatic language detection available:
Afrikaans, Albanian, Arabic, Belarusian, Bengali, Bosnian, Bulgarian, Cantonese, Catalan, Chinese, Chinese (Taiwan), Croatian, Czech, Danish, Dutch, English, English (Australia), English (UK), Estonian, Finnish, French, French (Canada), German, German (Switzerland), Greek, Hebrew, Hindi, Hungarian, Icelandic, Indonesian, Italian, Japanese, Kazakh, Korean, Latvian, Lithuanian, Macedonian, Malay, Maori, Norwegian, Pashto, Polish, Portuguese (Brazil), Portuguese (Portugal), Punjabi, Romanian, Russian, Slovak, Slovenian, Spanish, Spanish (Latin America), Swedish, Tagalog, Tamil, Thai, Turkish, Ukrainian, Urdu, Vietnamese, and Yiddish.
We regularly expand language coverage as the platform evolves. See all supported languages and their codes →
For speech-to-text, Fluen works with ElevenLabs Scribe v2, Speechmatics, Deepgram Nova-3, AssemblyAI and OpenAI Whisper. We benchmark these engines regularly and, by default, send each language to the engine that handles it best. If you prefer, you can pin one engine under Workspace Settings > Subtitle Defaults > Transcription engine.
The engines only turn speech into text. Splitting that text into well-timed, readable subtitles is done in-house by Fluen.
For translation, Fluen uses models from OpenAI, Anthropic, Google and DeepL, chosen according to the target language. Fluen then does a lot of its own post-processing, correcting and automatically rephrasing lines so subtitles read naturally in the target language while keeping the original meaning.
Yes. Fluen has a free plugin on Adobe Exchange that creates captions from your sequence audio and translates existing caption tracks into 50+ languages, without leaving Premiere. It uses the same Fluen account and credits you use on the web.
Processing a video in Fluen Studio consists of three key steps: media encoding, caption generation, and optional translation generation.
Media encoding, influenced by the file's length and size, typically lasts between 30 seconds and a few minutes. Caption generation, also dependent on the media's duration, may take up to a few minutes. Translation generation commences once the caption generation is complete and the caption review/post-edit has been completed, if you opted-in for the additional post-editing step. If multiple languages are required, translation processes occur simultaneously, usually completed in minutes.
Overall, you can estimate the total TAT (turn-around-time) to be less than half the duration of the video itself. The estimates vary with file size and system load.
Exporting the video with hardcoded subtitles is a separate process and may take a bit longer. Typically, consider anything between 1/4th and half of the video duration. The time it takes depends on the bitrate used in the original file (the higher the bitrate, the longer it'll take to process) and whether the export is for a 4k video, 1080 or 720p: lower resolutions should take less time.
Post-editing a track in Fluen Studio is straightforward. From your dashboard, open a track with the In Review status to go to the subtitle editor. There you can view all subtitles, edit text, cut/copy/paste content between subtitles, and adjust timing by dragging the edges of each subtitle on the timeline, which shows frames from your video, the audio wave and the subtitle text. Any changes you make are saved instantly, and you can review them in real time on the media player.
Once you're done with your changes, click on the "Complete" button on the top-right of the subtitle editor screen to move the process into the next step in the workflow.
You can choose whether to post-edit a track during the media upload process, or set it as your default under Workspace Settings > Subtitle Defaults. You can also edit your tracks once they're already completed. Whichever method suits your workflow best.
Not at all. In fact, the auto-generated subtitles provided by Fluen Studio are typically of high quality and will meet your needs in most instances. However, if you plan on translating the captions, we do recommend reviewing and post-editing the source language captions. Doing so can enhance the accuracy and overall quality of the auto-generated translation tracks, ensuring a better final product.
Fine-tuning subtitle timing is simple with Fluen Studio. In the subtitle editor, each subtitle appears on the timeline at the bottom, together with frames from your video and the audio wave. To adjust a subtitle's timing, drag the edges of its block on the timeline, or type an exact start or end time. Click anywhere on the timeline to jump to that moment. The issues list takes you straight to subtitles that are too long or too fast to read (press F8 to step through them). Our automatic timing is already highly accurate, so extensive adjustments are rarely needed.
Auto-Segmentation in Fluen Studio uses advanced Natural Language Processing (NLP) to interpret the grammatical structure of each sentence in a language-specific way. This means the process takes into account the unique grammatical and stylistic conventions of each supported language to determine optimal endpoints for each subtitle cue and the best places to insert line breaks.
This approach mirrors the strategies used by professional linguists when creating subtitles from scratch. They consider a sentence's grammatical structure and apply standard line treatment rules such as breaking lines after punctuation marks or before conjunctions and prepositions, while avoiding separating closely related elements like a noun from its accompanying article or adjective, first names from last names, or verbs from their subject pronouns.
Our auto-segmentation algorithm integrates these well-established subtitling rules, all the while considering other constraints such as the maximum characters per line. The result is a thoughtful blend of linguistic insight and technical precision to deliver high-quality subtitle segmentation.
Fluen Studio prioritizes the quality and readability of translations, leading us to adopt a unique approach. Unlike maintaining a strict one-to-one correspondence between caption and translation cues, we choose to group source captions into smaller paragraphs for translation. This approach offers a more coherent and contextually accurate translation output.
After translation, this text is then re-segmented into the target cues. The re-segmentation maintains correct timestamps from the source or generates new ones at appropriate break points, even if those break points did not exist in the source cues. This way, we ensure that the translated subtitles are not just accurate, but also fluid and easily understandable, enhancing the viewer's experience.
Auto-Wordsmith is an innovative capability enabled by AI and large language models (LLMs). It emulates a crucial aspect of professional linguists' work during subtitle translation: the skillful rewriting and adaptation of translated cues to meet character-per-second constraints or ensure optimal readability.
In certain language pairs, such as English to a more verbose language like German, the translated text may exceed the available time for display or become overly convoluted. In all cases where the translated text greatly exceeds the length of its source, our AI-driven Auto-Wordsmith feature automatically reformats and rewrites the translated segments while preserving the original meaning. By eliminating unnecessary content or refining the wording, the translated segments become more digestible and readable for viewers without sacrificing the core message.
Auto-Wordsmith is only applicable to auto-generated translations rather than captions. Since captions aim to provide a verbatim representation of the source content, they typically contain more literal and unchanged text.
Yes, on every plan including Free. Open the Share dialog and set Anyone with the link to Can comment. Anyone who opens that link can add notes under a name they type in, with no account and no sign-up.
Their comments land in your editor's Comments panel, pinned to the subtitle they are about, where you can reply and mark the thread resolved. On a Team workspace that panel is always in the toolbar; on Free and Premium it appears once a link allows comments, or once a comment has arrived.
You are not emailed once per comment: Fluen waits until a track has gone quiet and sends one email covering the whole batch. Full walkthrough: Comments, reviews and approvals.
Yes. Fluen is listed in Zapier's app directory, so you can connect it to more than 9,000 apps without writing any code. Start subtitles for every video that lands in Google Drive or Dropbox, post to Slack or send an email the moment captions and translations are ready, and file the finished subtitles wherever your team keeps them.
It works on every Fluen plan, and Zapier's own free plan is enough to get started. You connect the two with a Fluen API key from Settings > API & Webhooks. See Fluen on Zapier for the triggers and actions available.
During the file upload process, you can choose multiple target languages, and you can also set the languages pre-selected for every upload under Workspace Settings > Subtitle Defaults.
You have the flexibility to add new language tracks to your media even after the initial set has been processed and completed. This can be done at any time, be it days or weeks later, according to your needs.
Yes. In Fluen Studio, go to Workspace Settings > Subtitle Defaults. The choices you make there are pre-selected on the upload screen, so they match your usual work. They include:
1. Spoken language: the language usually spoken in your media, or Detect automatically.
2. Speaker changes: Off (the default), Dash to mark each new speaker with a dash, or Name labels to name each speaker.
3. Review before translating: whether you want to check the original captions before translations are made.
4. Translate every upload into: the languages pre-selected for translation each time you upload a new file, plus whether translations wait for your review.
5. Transcription engine: Auto (recommended) uses the engine that handled each language best in our regular tests. You can also pin one engine for every file: ElevenLabs Scribe v2, Speechmatics, Deepgram Nova-3, AssemblyAI, OpenAI Whisper or Deepgram Whisper.
6. Subtitle splitting: how text is split into subtitles. Auto picks a method by file length and language, Standard gives fast, grammar-aware line breaks, and Smart follows the meaning across sentences.
Yes. On the upload screen, under or import from, choose Google Drive or Dropbox and pick your files. They are copied straight from your cloud storage, so you don't need to download them to your computer first. This works on every plan, including Free.
Paid plans can also import from a public file link (URL) and add up to 50 files in one upload; the Free plan takes one file at a time. YouTube links are not supported. To start subtitles automatically whenever a new file lands in a Drive or Dropbox folder, use the Zapier integration.
Yes, on paid plans. Once the source language caption track is generated, you can replace the automatically created captions by importing your own SRT file, then translate it. This option is perfect if you prefer to review or edit the subtitles outside of Fluen Studio. You can also re-import corrected SRT files for many videos at once: Fluen matches each file to its video by file name.
Absolutely, you can delete a subtitle track and start over if needed. To do this, navigate to your media dashboard and access the media details by clicking on the media title or the 'open' icon. This will display all language tracks for your media. If you wish to delete a particular subtitle track, just click the trash can icon next to it. If you want to add it again, simply use the dropdown menu located below the language tracks list.
In Fluen Studio, how long we keep your video and audio files depends on your plan: 30 days on Free, 90 days on Premium, 180 days on Team and 1 year on Enterprise.
Even after these assets are removed, the media entry remains in Fluen Studio, and you still have indefinite access to your subtitle tracks for export whenever necessary.
However, it's crucial to note that if you choose to manually delete a media file, it results in a permanent removal of both the video assets and the associated subtitle tracks, and these cannot be retrieved. Hence, please exercise caution when removing media to prevent unintended loss of data.
Custom subtitle limits are available on every plan. Go to Workspace Settings > Subtitle Limits, where you can set the maximum characters per line and the maximum lines per subtitle for each language. New subtitles follow these limits, so the output matches your own style guide. To change them for a single track, use the Rules button in the editor toolbar, which re-flows the subtitles to the new limits.
Speaker diarization detects when the speaker changes in a recording with more than one person. It is off by default: turn it on when you upload a file, or set it as a workspace default under Workspace Settings > Subtitle Defaults > Speaker changes. Choose Dash to mark each new speaker with a dash, or Name labels to name each speaker. In subtitle files, names appear as [Speaker Name]; in the editor and in exported videos, your caption style shows the name as a label. In the editor, speakers are color-coded so you can rename or reassign them in seconds.
The settings for 'max characters per line' and 'max lines per caption' dictate the format of the auto-generated subtitles. Specifically, 'max characters per line' sets a limit on the number of characters in each subtitle line, and 'max lines per caption' determines the maximum number of lines for each caption block. When generating subtitles, these parameters are adhered to, ensuring your output aligns with your specific preferences.
The reason for different default settings for "max characters per line" (Max CPL) in various languages is based on established conventions outlined in prominent style guides such as those utilized by Netflix or the BBC. These style guides take into account language-specific characteristics and typographical norms. For instance, Asian languages typically require fewer characters per line compared to Roman languages like English or German. These language-specific variations aim to ensure optimal readability and adherence to industry standards for subtitles in different linguistic contexts.
Fluen supports 7 subtitle file formats: SRT, WebVTT, TTML, SBV (YouTube SubViewer), ITT (iTunes Timed Text), EBU STL and SSA. You can also export an MP4 with the subtitles burned into the video (in 4K, 1080p or 720p), and download transcripts as plain text (.txt), Word (.docx) or PDF (.pdf), laid out in paragraphs or one line per subtitle, with optional timestamps. Exports are included in the paid plans.
Yes, on paid plans you can burn the subtitles into your original video and export it as an MP4 file in 4K, 1080p or 720p quality. The video uses your caption style, including dynamic word-by-word captions, so it matches what you see in the editor.
Yes. In the caption or translation editor, click the Caption style button under the video. The panel has three tabs: Presets, with 30+ ready-made static and animated styles; Customize, where you can change the font, color, size, outline, shadow and background plate; and Motion, which sets how words and lines appear. Click a preset to apply it, and use Undo if you change your mind. Your style is used in the editor, on share links and in videos you export with burned-in subtitles.
Dynamic captions are animated, word-by-word captions: each word lights up, fills in or pops as it is spoken, a look that works especially well on social video. Fluen has more than 30 built-in caption styles: 14 dynamic ones, plus static looks for broadcast, e-learning and corporate videos.
Pick a style with the Caption style button under the video, fine-tune it, and save it under a name. In a team workspace, saved styles are shared with everyone, and the owner can choose the style every new video starts with under Workspace Settings > Caption styles. Translations follow the style of the original captions until you give them one of their own.
Caption styles are available on every plan, including Free. On paid plans, videos you export with burned-in subtitles match what you see in the editor. Learn more about dynamic captions →
Currently, Fluen Studio does not generate ADA or WCAG compliant subtitles as a default output. However, it is possible to manually make the subtitles compliant through post-editing. If you don't have access to linguistic resources to perform this task, we may be able to offer assistance through our pool of professional linguists, to help ensure compliance with ADA or WCAG guidelines for your subtitles.
Audio and video files are stored for 30 days on Free, 90 days on Premium, 180 days on Team and 1 year on Enterprise. Your subtitle tracks remain accessible after that, with no time limit.
Yes, your videos are private and accessible only to you, or your workspace members if you're on a Team Plan. You can optionally generate a time-limited public review link (72-hour expiry) for individual tracks to share with external reviewers: this is opt-in and the link expires automatically.
If you are unable to log in to Fluen Studio, please follow these steps:
1. Check your internet connection: Ensure that your internet connection is stable and functioning properly.
2. Verify your account details: Double-check that you are using the correct account credentials (username or email) to log in.
3. Confirm password accuracy: Make sure that the password you are entering is correct. If you have forgotten your password, use the password recovery link available on the login screen to reset it.
If you have attempted these steps and are still experiencing difficulties logging in, please reach out to us at [email protected] for further assistance.
First, ensure you have a stable internet connection, as this could affect the loading process.
If your connection is stable, the issue may be related to your login method. If you initially signed up using a social login (like Google) and later created another account with the same email but different authentication (username and password), this could cause confusion in the system. To resolve this, make sure to log in using the same method you used during signup. For instance, if you used Google to sign up, log in using the "Continue with Google" button.
This issue often arises for users who originally signed up with a social login option, such as "Sign up with Google". If you signed up this way, the system doesn't recognize the email you entered as having a separate password, which is why you haven't received a password reset email. To resolve this, simply log in using the "Continue with Google" button as you never set up a password for Fluen Studio initially.
If you are certain that you signed up with both an email and a password, please use the contact form on our website and we'll assist you with your login issues.
A Team account has two roles:
To share a workspace, go to Workspace Settings > Members, click Add Member, and enter the collaborator's email. They will receive an email invitation to join after registering a free Fluen Studio account.
Once registered, they should see a prompt to confirm joining your workspace. If it doesn't appear, ask them to refresh their browser.
Yes! Click the "+" icon next to "My Workspaces" in the side menu to create a new workspace. You can also invite collaborators to upload content, review generated tracks, and export files.
The Team Plan includes two seats (one for the owner and one collaborator). You can purchase additional seats anytime from My Account > Team Management.
No, your plan's included minutes remain the same regardless of the number of collaborators. However, you can purchase extra credits from the My Account section to ensure continued work.
Each additional collaborator costs $10/month on a monthly plan or $50/year on an annual plan. If added mid-cycle, the charge is prorated based on the remaining time.
No. If a collaborator is already in one of your workspaces, adding them to another does not use another invite. Invites are only consumed when adding a new email that hasn't been a collaborator before.
Sending a track for review is a Team plan feature. In the Comments panel click Send for review, enter the reviewer's email address and choose the language they are reviewing. They receive their own private link, valid for 7 days, and need no Fluen account. One person can be asked for several languages in a single send.
On that link the reviewer can comment, propose replacement wording that you apply with a single Accept, and finish with Approve or Request changes. Each language is approved on its own, so you always know exactly which ones are signed off.
Approval never locks a track. If you edit the content after an approval, Fluen marks it out of date and the button becomes Request re-approval; style-only changes such as a font or colour do not affect it. Details: Comments, reviews and approvals.