Subtitling service

Subtitling Services for video that has to read cleanly on every screen it reaches.

Subtitling, closed captioning, and SDH for episodic, film, training, and short-form video, with timing, reading speed, and line breaks checked against the platform specification and an independent QC pass before any file is returned.

Subtitling delivery records show subtitling and QC run as separate passes, reviewer continuity held across a multi-year catalog, and timing and rendering confirmed per device before files are returned.

110,000+ verified language specialists
300+ languages across active service lines
4,500+ dialects and regional variants
110+ rare and indigenous language pairs
1,000+ brands served since 2015
Subtitle spec board What a subtitling job has to settle before the first cue is timed.

Subtitling is the one language service where the numbers are set before the words are. These four are agreed on a sample episode, because agreeing them after a season is delivered means redoing the season.

01 Subtitles, captions, or SDH

Subtitles carry dialogue for a viewer who can hear. Captions and SDH also carry speaker identification, sound effects and music cues, because the viewer cannot. The requirement decides the file, not the other way round.

02 The specification

Reading speed, maximum line length, lines on screen, minimum and maximum cue duration, and shot-change handling. A platform sets these, and a file that misses them is rejected on delivery however well it reads.

03 Languages and the timing template

Which languages, and whether they share one timed template or each needs origination. One template across many targets is cheaper and forces every language into the same cue boundaries, which does not always survive.

04 Format, frame rate, and where it plays

The delivery format and frame rate the platform accepts, whether the text is burned in or a sidecar file, and the devices it has to render on — a line that fits a laptop can overflow a phone.

Spec agreed on a sample episodeQC as a separate passCaptions and SDH in the same lane

Scope dossier

Subtitling service fit Subtitling delivery records show subtitling and QC run as separate passes, reviewer continuity held across a multi-year catalog, and timing and rendering confirmed per device before files are returned.
Typical inputs
Video or audio masters with frame rate, any existing transcript or template file, the source and target languages, the platform or house-style specification, whether subtitles are burned in or delivered as a sidecar, and the delivery format the platform accepts
Controls
Transcription and timing QC, reading-speed and line-break checks against the spec, an independent QC pass separate from the subtitling pass, native linguistic review, format and character-set validation, and rendering checks on the target devices
Best fit
Subtitling services for streaming and OTT catalogs, closed captioning and SDH for accessibility requirements, subtitle QC on files produced elsewhere, training and corporate video, and short-form social video at volume

What subtitling services are

Subtitling services, explained

Subtitling is the process of turning the spoken content of a video into timed on-screen text, usually in another language, so a viewer can follow it without relying on the original audio. It is not the same deliverable as closed captioning: subtitles are written for a viewer who can hear and carry dialogue and on-screen text, while closed captions and SDH are written for a viewer who cannot and add speaker identification, meaningful sound effects, and music cues. Both are produced against a specification rather than freely — reading speed, maximum line length, how many lines may sit on screen, minimum and maximum cue duration, shot-change handling, and the delivery format and frame rate the platform accepts. A subtitling job is therefore defined by the runtime, the source and target languages, whether a verified transcript or timed template already exists, the specification the file has to meet, and whether the text is burned into the picture or delivered as a sidecar file. MoniSa subtitles and captions video across 300+ languages and 4,500+ dialects, runs subtitling and the QC pass as separate lanes so that timing errors and language errors are found by different reviewers, and operates under ISO 9001, ISO 27001, and ISO 17100 certification, which covers translation services.

Captioning and accessibility

Closed captioning and SDH.

The same lane produces all three deliverables, and the difference is who the file is written for. These are the two buyers ask to have separated before scoping.

What closed captioning includes

Closed captioning is written for a viewer who cannot hear the audio, so beyond the dialogue it carries speaker identification, meaningful sound effects, and music cues, and it stays synchronised with what is happening on screen. It is usually what an accessibility obligation means in practice, which is why the required standard and the delivery format are set by the platform or the regulation rather than by preference. MoniSa produces captions in the same lane as subtitles, with an independent QC pass on timing, readability, and completeness before delivery.

Multimedia services overview

What SDH delivers that a caption track does not

SDH — subtitles for the deaf and hard of hearing — carries the same content as closed captions but is delivered in the subtitle format a platform already supports, so it travels with the subtitle tracks instead of needing a separate caption stream. That makes it the practical route to accessible viewing on streaming platforms and on localized titles, where the audience needs the added cues in a language other than the original. MoniSa delivers SDH alongside translated subtitle tracks, to the same specification and the same separate QC pass.

Media and OTT delivery paths

Service signal

Pick the service by the result at risk.

Buyers can see the result, review depth, and file-shape fit before they compare vendors line by line.

01

When to use it

When a subtitle file has to satisfy a platform specification, a release date, and a viewer who notices a late cue immediately.

02

Strongest fit

Subtitling services for streaming and OTT catalogs, closed captioning and SDH for accessibility requirements, subtitle QC on files produced elsewhere, training and corporate video, and short-form social video at volume

03

How the work runs

Specification and template locked against a sample episode, then batch delivery with subtitling and QC as separate lanes and a correction window held open after handoff

Formats we handle

VideoFootage and subtitles
TextDocuments, UI, copy
AudioSpeech and voiceover
MetadataTags and taxonomy

Subtitle workflow

A subtitle file is judged against a specification, so the specification comes first.

Reading speed, line length, cue duration and shot-change handling are numbers a platform sets before anyone writes a word. Agreeing them on a sample episode is what stops a whole season being reworked after the first rejection.

A subtitle file is judged against a specification.
A subtitle delivery queue carries an episode, a language and a stage — and the stage is what tells a buyer whether a file has been through the QC pass yet.
01

Specification locked on a sample

Reading speed, line count and length, minimum and maximum cue duration, shot-change rules, and the delivery format and frame rate are fixed against one episode before the batch starts.

02

Timing and language reviewed separately

Subtitling and QC run as distinct passes, because a late cue and an awkward line are found by different kinds of attention and one reviewer doing both will miss one of them.

03

Checked where it will be watched

Rendering, line breaks and timing are confirmed on the target devices, since a subtitle that reads cleanly on a laptop can overflow on a phone or mistime on an OTT box.

Specification agreed before the batch
QC as a separate pass
Rendering confirmed per device

Who this is for

Each stakeholder sees their risk.

Buyers need to see when the service fits, what can go wrong, and how review reduces rework.

01

VP Data Ops

Needs language coverage, throughput, and quality controls for multilingual data.

02

LSP vendor manager

Needs rare-language capacity without exposing the end client.

03

Media localization lead

Needs subtitle, dubbing, metadata, and QA workflows to meet a release date.

Specification

Lock the details that decide quality.

Use this table to compare inputs, review model, fit, and output before a buying committee asks.

Typical inputsVideo or audio masters with frame rate, any existing transcript or template file, the source and target languages, the platform or house-style specification, whether subtitles are burned in or delivered as a sidecar, and the delivery format the platform accepts
Review pathTranscription and timing QC, reading-speed and line-break checks against the spec, an independent QC pass separate from the subtitling pass, native linguistic review, format and character-set validation, and rendering checks on the target devices
Strongest fitSubtitling services for streaming and OTT catalogs, closed captioning and SDH for accessibility requirements, subtitle QC on files produced elsewhere, training and corporate video, and short-form social video at volume
How the work runsSpecification and template locked against a sample episode, then batch delivery with subtitling and QC as separate lanes and a correction window held open after handoff

Quality method

Quality starts before the first batch moves.

MoniSa uses a three-layer system: pre-production gates, in-production controls, and post-delivery review.

Screen

Profile review, nativity verification, domain questionnaire, screening call, sample task.

Calibrate

Every assigned team works against the same calibration items before production volume starts.

Pilot

The first batch is reviewed deeply so instruction drift is caught before scale.

Review

Sampling, senior review, agreement checks, and same-day feedback loops run during production.

Escalate

Critical errors trigger pause, recalibration, replacement, or operations-lead escalation.

Learn

Client feedback feeds back into resource profiles, glossary rules, and the next batch.

case evidence

Proof that matches subtitling services, not generic language work.

The records below stay close to this delivery model so the proof feels operational, not decorative.

Media and metadataFixed-window OTT rare-language sprint.

OTT rare-language sprint

The challenge. A streaming team needed subtitle, dubbing, and metadata work to land for a fixed release window.

What we did. MoniSa ran parallel language pods with timing QC, linguistic review, and metadata checks before client handoff.

The result. The release package moved through timing, language, and metadata checks before client review.

Open full case
Media and metadataThree-year streaming subtitling and QC held to one bar, client details confidential.

Streaming subtitling and QC

Problem. A streaming platform needed continuous Tamil and Hindi subtitling and QC across a growing catalog.

Action. MoniSa ran subtitling and a separate QC lane white-label with reviewer continuity and a fixed bar.

Result. The platform received 3,100+ minutes subtitled and 2,000+ episodes QC over three years.

Open full case
Media and metadataDevice-aware subtitle QC across five screens at project-scoped quality review, client details confidential.

Multi-device subtitle QC

Problem. A media catalog needed subtitle QC verified across five device types and four languages.

Action. MoniSa ran QC against a per-device checklist with native reviewers per language.

Result. The catalog received 500+ hours of subtitle QC at project-scoped quality review across Mac, Windows, mobile, iPad, and OTT.

Open full case
Media and metadataRegional streaming QA held to one bar across four languages, client details confidential.

Streaming multimedia QA

Problem. A global streaming platform needed consistent multimedia QA across four South Indian languages during regional expansion.

Action. MoniSa sourced native reviewers per language against a fixed QA checklist with senior escalation.

Result. The platform received 500+ hours of QA across Tamil, Telugu, Kannada, and Malayalam, held to one bar.

Open full case

Related media paths

A subtitle file rarely ships alone.

Subtitling usually sits inside a release with dubbing, metadata, and market adaptation around it. Use the routes below when the deliverable is wider than the subtitle track.

Media and OTT operations

See the full release path for a multilingual catalog, from source material to delivery closure.

Translation services

Handle scripts, synopses, and supporting written material as separate written work.

Buyer questions

Ask the questions weak vendors avoid.

Short answers for buyers checking fit, coverage, quality method, and next-step readiness.

How much does subtitling cost per minute?

Subtitling is quoted per project rather than from a published per-minute rate, and the per-minute framing hides most of what moves the figure. The drivers are the language pair and how many qualified subtitlers work in it, whether the job is origination and timing from the video or translation against an existing timed template, speech density and how often speakers overlap, the specification the file has to meet, how many target languages share one timing template, and whether an independent QC pass is included or assumed. Ask for the quote separated into origination, translation, QC and format delivery, and compare providers on that breakdown rather than on a headline minute rate.

How much do subtitlers get paid?

There is no single figure, and a rate quoted as a national average describes a market rather than a piece of work. What a subtitler earns moves with the language pair and how many qualified people work in it, whether the task is origination and timing or translation against a supplied template, how demanding the material is, the turnaround, and whether the engagement is one file or a continuing catalog. MoniSa contracts subtitlers per project on terms agreed with the linguist and publishes no rate bands, because a single band would misdescribe most of the pairs the work runs in.

How do I get into subtitling?

The usual route is a strong pair of working languages, deliberate practice with the constraints rather than with translation alone — reading speed, line length, cue duration, shot changes — and a portfolio of timed files that shows those constraints being respected. Most people learn one subtitling tool, then take QC or template-timing work before origination, because reviewing files teaches a specification faster than writing them does. A sample that reads cleanly at speed counts for more than a certificate. MoniSa recruits subtitlers and subtitle reviewers into its specialist network, and applications go through the careers page rather than a project enquiry.

What is the best software for subtitling?

There is no single best tool, and the useful version of the question is which constraints your work has. Judge a subtitling tool on the delivery formats and frame rates it writes without post-editing, whether it enforces reading speed, line length and minimum cue duration while you type rather than reporting them afterwards, shot-change detection, waveform and frame-accurate navigation, how it handles right-to-left and complex scripts, and whether one timing template can be carried across several target languages. MoniSa works in the tool a platform or partner requires and delivers to their specification rather than to a preferred toolchain.

What is the difference between subtitling and closed captioning?

Subtitles are written for a viewer who can hear the audio but does not follow the language, so they carry dialogue and on-screen text and nothing else. Closed captions are written for a viewer who cannot hear it, so they add speaker identification, meaningful sound effects and music cues, and they are what an accessibility requirement usually means. SDH — subtitles for the deaf and hard of hearing — is the same content delivered in the subtitle format a platform already supports, which is why it ships alongside subtitle tracks rather than as a separate caption stream. The production lane is the same; the output contract is not, so which one is wanted has to be named at scoping.

What does MoniSa need before quoting a subtitling project?

Runtime and the number of files, the source and target languages, the delivery format and frame rate, the platform or house-style specification where one applies, any existing transcript or timed template, whether the subtitles are burned in or delivered as a sidecar file, whether closed captions or SDH are wanted alongside them, and the release date. With those, the answer is feasibility and a defined quote rather than a range that moves once the files arrive.

Subtitle brief

Send the specification with the runtime.

A useful first brief for subtitling names the runtime, the source and target languages, the delivery format and frame rate, the specification the file has to meet, and whether captions or SDH are wanted alongside the subtitles.

Production-ready brief

01Runtime, number of files, and source format02Source and target languages03Subtitles, closed captions, or SDH04Platform or house-style specification05Delivery format, frame rate, burned-in or sidecar06Existing transcript or timed template, and the release date

Capability at a glance

The answers most briefs open by asking for.

Buyers rarely start with who we are. They start with a list of fields to fill. Here are ours, so the first email can be about the work instead.

Languages and locales
300+ languages and 4,500+ dialects, quoted per locale rather than per language — because the dialect decides whether a dataset is usable, whether a market accepts a release, and which specialist the work goes to.
Specialist network
110,000+ verified language specialists — linguists, annotators, and reviewers — plus voice talent and subtitlers, matched to the language, domain and task before assignment.
Capacity and mobilisation
Named availability confirmed per pair before scoping. Coverage is reported as staffed today or needing a recruitment window, in writing, before a launch date or release window is agreed.
Sourcing constraints
Specialists can be sourced against geographic, residency, locale and demographic requirements — including native-only, in-country, and speaker-diversity quotas where a data programme demands them.
Deliverables and specs
Work is delivered to the receiving specification: structured formats and schemas for data and annotation work, and timed-text, audio and platform conformance for media — subtitle reading speed, line limits, cue timing, channel and sample-rate requirements included.
Comparable work
62 documented case studies stating the scope, the constraint that made it difficult, and the measured result — across AI data programmes, partner overflow, and media releases. 2,000+ AI projects delivered and 1,000+ brands served since 2015.
Certifications
ISO 9001:2015 quality management, ISO 27001:2022 information security, and ISO 17100 translation services — scoped to translation specifically, and stated that way rather than implied across every line.
Commercial basis
Quoted in the unit the work is measured in — per word, per audio hour, per approved hour, per finished minute, per batch, per item — with what the unit includes stated alongside it, whether the quote is for you or for a client you quote onward.

Need this against your own template? Convert your scope between units and check the deadline, then send the brief with your language list, content type, volume and deadline, and the acceptance criteria you will judge the output against — those four decide feasibility, and the reply addresses them directly.

Scope a project Call