
Subtitling · Welsh
Welsh subtitling services
Native Welsh subtitlers for corporate video, eLearning, documentary, broadcast and advertising. Mutations written as the grammar requires, in the format your platform needs. Part of a full Welsh language service: subtitles, voice over scripts, and translation of any content you need.
About Welsh subtitling
The word on screen is not the word in the dictionary
Welsh changes the first letter of a word according to what comes before it. Cymru is the country; go to it and it is *Gymru*, be in it and it is *Nghymru*, list it after certain words and it is *Chymru*. Four spellings, one word, and only the first of them is the one you would look up. Nothing about this is optional — the mutated form is the correct form, and the unmutated one reads as a mistake.
For a subtitle file that has two consequences. The first is arithmetic: the nasal mutation adds letters rather than swapping them, turning C into Ngh, and the trigger word grows with it, so *yn Cymru* becomes *yng Nghymru* and a two-word phrase costs three characters more. The second is that every term in your glossary now has up to four written forms, and a check that only knows one of them will report a file as inconsistent when it is perfectly correct.
At GoLocalise we work with native Welsh subtitlers who apply the standard mutation rules as a matter of course, and we break lines where the grammar allows it rather than where the character count runs out. Terminology is checked across the mutated forms as well as the radical, so a client glossary still means something once the text is on screen.


Which do you need?
Open captions, closed captions or SDH
Three different deliverables that people often ask for by the wrong name. Here is the short version.
Open captions
Burnt inSubtitles burnt permanently into the picture. Nobody can switch them off, which is exactly what you want for social feeds that autoplay muted — and in Welsh it fixes the line breaks at delivery, so no player can separate a preposition from the word it has mutated.
- Always visible
- Line breaks fixed at delivery
- Delivered as a finished video file
Closed captions
SwitchableA separate file the viewer can turn on and off, and that can carry several languages at once. The standard for YouTube, Vimeo and the streaming platforms.
- Viewer controls them
- Multiple languages from one video
- Indexed by search engines
SDH
AccessibilitySubtitling for the deaf and hard of hearing: dialogue plus speaker IDs and the sound effects and music cues that carry meaning.
- Speaker identification
- Non-dialogue audio described
- Meets accessibility requirements
Subtitles or captions? The two terms are often used interchangeably. Strictly, subtitles translate the dialogue for viewers who can hear the audio, while captions are same-language and add speaker labels and sound cues for viewers who cannot. We produce either — translated Welsh subtitles or same-language Welsh captions and SDH — in whichever form your platform and audience require.
What we subtitle
Welsh subtitling for every kind of content
Welsh subtitling runs across public-sector and education work carried out under the language standards, plus broadcast, corporate and social video where a single term has to be recognised in every written form it takes. These are the formats we handle most.
Corporate & training video
Internal comms, onboarding and product training subtitled for global teams and LMS delivery.
eLearning & online courses
Timed, readable subtitles for course platforms, MOOCs and instructional video.
Documentary & factual
Festival, broadcast and streaming documentaries, including interview clean-up and on-screen text.
Advertising & social
Burnt-in captions for muted autoplay on Instagram, TikTok, YouTube and paid social.
Streaming & OTT
Platform-spec subtitle and caption files for VOD, OTT and broadcast delivery.
Accessibility (SDH & closed captions)
Same-language SDH and closed captions to meet WCAG and accessibility requirements.
Events, webinars & conferences
Recorded talks, town halls and webinars captioned for on-demand viewing.
E-commerce & product video
Short product and explainer videos captioned to lift conversion and reach.
How can we help you?
Your project manager has everything covered
One point of contact from brief to delivery, and both a linguistic and a technical check on every file.
Brief review
We review your video, your audience and the platform, including any client glossary and which of its terms will appear on screen in mutated form.
Template and translation
Where needed, we create an English subtitle template first, then send it to a native Welsh subtitler.
Timing and quality checks
Subtitles are timed against the video and checked for reading speed, line length, correct mutation, and format compliance.
Delivery and display check
Files delivered in the format you need, with no line break left sitting between a trigger word and the word it changed.
Our standards
The specs we work to
Readable subtitles are a matter of measurable limits, not opinion. These are the defaults we apply to Welsh unless your style guide says otherwise.
Maximum per line
Nasal mutation adds two to a C
Maximum on screen
Break before the preposition
Reading speed
13 for children's content
Minimum duration
Seven seconds maximum
Welsh runs longer than English, and mutation is part of why: *yng Nghymru* is three characters more than the two words it is built from. The Netflix guide for Welsh is precise about where a line may be divided: after punctuation, before a conjunction, before a preposition. That last rule earns its place, because the preposition is what causes the change. Split the two and the reader meets a word that has altered shape for no visible reason.
Deliverables
Professional subtitle formats
We adapt your existing translations into subtitle format or create subtitles from scratch, in Welsh, English or any other language. And if the project needs a timed script or a plain document instead, we deliver that too.
Standard text-based
Compatible with most platforms and players.
Broadcast & professional
For broadcasters, post houses and streaming delivery specs.
Burnt-in video
A finished file with the subtitles baked into the picture, line breaks and all.
Need a different format? Convert SRT, VTT and more with our free subtitle converter →
| Where it's going | What we deliver |
|---|---|
| YouTube, Vimeo & LMS platforms | SRT or VTT closed captions |
| Netflix, Amazon & broadcast | IMSC, TTML or EBU-STL to platform spec |
| Instagram, TikTok & paid social | Burned-in captions in MP4 (open captions) |
| Premiere, Final Cut & DaVinci Resolve | SRT / VTT that import straight into your edit |
Not sure which you need? Tell us the destination platform and we deliver to its exact spec.
Welsh specifics
Four spellings of one word, and where the line may break
There are three mutations and they behave differently on a line. The soft one mostly swaps a letter (p to b, t to d, c to g), and one radical, g, disappears altogether, so the word gets shorter. The aspirate adds an h. The nasal is the expensive one: p becomes mh, t becomes nh, and c becomes ngh, two characters longer than what it replaced, at the exact moment you are trying to reach forty-two.
Which is why the break point is a grammatical decision here. A mutation is caused by the word in front of it, so a line divided between the two hands the reader an altered word with its explanation on the previous line. The Netflix guide for Welsh asks for breaks before prepositions and conjunctions and warns against separating a verb from its subject pronoun, which is the same instinct expressed as a rule.
The market is small and regulated rather than small and casual. The 2021 census put 538,300 people in Wales aged three or over able to speak Welsh, 17.8 % of the population, and the Welsh Language (Wales) Measure 2011 gave the language official status, created a Welsh Language Commissioner and set standards that designated public bodies have to meet. Add a national broadcaster working in the language, S4C, and there is far more Welsh video needing subtitles than that headcount suggests.
Since 2008
Subtitling & captioning
100+
Languages covered
ISO 9001 & 14001
Certified processes
24–48h
Typical turnaround
Subtitling rates
Professional Welsh subtitling
For single videos and straightforward content where accurate, well-timed subtitles are what you need.
- Native Welsh subtitler
- Mutations checked, not assumed
- Frame-accurate timing
For longer content and recurring projects, including transcription, SDH, burned-in subtitles and multiple output formats.
- Everything in Standard
- Transcription and template
- SDH and burnt-in
- Multiple output formats
Every project is quoted individually and backed by our Price Match Promise. Send us your video for an exact, no-obligation quote.
Trusted by global brands
Related services
The rest of your Welsh project
Subtitling & captioning in more languages
Native subtitlers for corporate video, eLearning, streaming, documentary and advertising. Browse another language, or ask us about yours.
Most common questions
Why does the same Welsh word appear spelled several different ways?
Because Welsh mutates the first letter depending on what precedes it. Cymru, Gymru, Nghymru and Chymru are all the same word in different grammatical positions, and each one is correct where it stands. A reviewer comparing a subtitle file against a term list will see four spellings and may flag three of them; a native subtitler will tell you they are the same entry.
Do mutations change how much text fits on a line?
The nasal one does. It adds letters instead of exchanging them, so c becomes ngh and the word arrives two characters longer than the dictionary form, while the trigger in front of it may grow as well. The soft mutation can go the other way and lose a letter. Over a whole file it matters, and it is one of the things we count when a line is close to the limit.
Will a find-and-replace update a term throughout a Welsh subtitle file?
Not reliably, and this is where automated terminology work tends to fail in Welsh. Searching for the radical form misses every mutated instance, and replacing it blindly writes an unmutated word into a position that requires the change. Updating a term across a file is done by someone who knows which form belongs where, which is why we handle glossaries as editorial work rather than a script.
Do you subtitle in north Welsh or south Welsh?
Standard written Welsh by default, which is what the streaming style guides ask for and what reads naturally across the whole of Wales. Regional forms are used where the content needs them, typically to keep characters distinct from one another in drama. If your organisation works to Welsh Language Standards and has its own house style, we follow that instead.
What does Welsh subtitling cost per minute?
It starts at £18 per minute of video. The figure depends on running time, on whether we transcribe the Welsh audio first, on SDH or a burnt-in master, and on how many output formats you need at the end. Checking mutation and terminology is part of the linguistic QA rather than an add-on. Every project is quoted individually with our Price Match Promise.
The audio is already Welsh. Do you caption it rather than translate it?
Yes, and a lot of our Welsh work is exactly that. Same-language Welsh captions and SDH serve accessibility obligations and muted social video, and because there is no translation step the craft sits in spotting, condensing and choosing the break. Getting a spoken mutation onto the page in its written form is part of that, not something a transcript can settle on its own.
We have a Welsh script already. Can you subtitle from it?
Certainly. We spot and time from what you send and read it against the audio, which is usually where the differences show up, since a script written for narration often carries different mutations from what is actually said. If there is no script we transcribe the Welsh audio first. Either route ends with the same linguistic and technical QA.
Which editing software are your subtitle files compatible with?
All the common ones. We deliver SRT, VTT, STL and TTML that carry Welsh diacritics and the line breaks we chose into Premiere Pro, Final Cut Pro, DaVinci Resolve and the major online editors — or burnt into the picture as a finished MP4/MOV, so nothing downstream gets to rewrap a mutated phrase for you.
Ready to subtitle your video in Welsh?
Send us your video and we'll come back with an exact, itemised quote.
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- 100+ languages covered
- Tailored to your needs
- Stringent quality control
- Dedicated project managers
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- Experienced subtitlers
- Industry-standard software
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