Finnish Text to Speech: Free, In-Browser, Nothing Uploaded
Finnish gets exactly one neural engine in this build, and it only reaches people at a desk with a working GPU. Paste Finnish text, press play, and the audio is generated on your own device — no account, no upload, no character limit. This page is the honest version: which engines really speak Finnish (Suomi), which ones silently do not, and what each one costs you.
Which engines actually speak Finnish
Quick TTS ships four TTS engines and lets you switch between them from one dropdown — but not all four cover every language, and the gaps are not the ones you would guess from the marketing.
| Engine | Finnish? | What that means |
|---|---|---|
| Web Speech API | Yes | Your operating system's built-in Finnish voices. No download, works on every device including iPhone and Android. |
| Piper (WebAssembly) | No | Quick TTS does not ship a Piper Finnish voice yet — upstream carries one, but it has not passed our intelligibility checks — so the option is hidden rather than offered and then failing. |
| Kokoro-82M (WebGPU) | No | English only. Hidden on every other language, because a voice you cannot select is not an option. |
| Supertonic HD (WebGPU) | Yes | 44.1kHz studio-grade Finnish, one of thirty-one mapped languages. WebGPU-only, ~380MB cached once. |
Only one of Quick TTS's three neural engines speaks Finnish, and it is worth being specific about the other two:
- Piper ships no Finnish voice. Quick TTS does not ship a Piper Finnish voice in this build — the upstream catalogue does carry one, but it has not been through our per-voice intelligibility checks yet — so the engine option is hidden here rather than shown and then failing to load. It stays hidden here rather than showing and breaking.
- Kokoro-82M is English-only in both its voice list and its phonemizer, and is hidden on every non-English locale, Finnish included.
- Supertonic HD does speak Finnish, natively, at 44.1kHz, as one of the 31 languages this build maps to it.
That is the same one-engine shape as Korean and Japanese. Supertonic is WebGPU-only, which makes it a desktop feature in practice, so most visitors to this page are actually choosing between their operating system's built-in Finnish voice and nothing at all, unless they're on a desktop with a capable GPU.
The honest limits
Supertonic HD is WebGPU-only with no WebAssembly fallback tier, and there is no Piper voice sitting underneath it the way there is for languages like Spanish or Dutch. On a desktop with a working GPU, a one-time roughly 380MB cached download gets you studio-grade 44.1kHz Finnish. On a phone, or any machine without WebGPU, you get whatever Finnish voice your operating system ships and nothing in between.
That floor varies a lot by platform. Windows has shipped a classic Finnish SAPI voice since the Anniversary Update, and Edge adds several nicer Azure-based online voices on top of it; macOS and iOS ship one system voice; Android's coverage depends on the device and manufacturer. None of that is a neural engine running in the browser — it's each platform's own text-to-speech stack, with the quality that implies.
Finnish text-to-speech has to get vowel and consonant length right, because Finnish is phonemically quantitative: a single letter versus a doubled one is a different word, not a stylistic choice. tuli (fire) and tuuli (wind) differ only in vowel length, and tapa (habit) versus tappaa (to kill) only in consonant length. An engine that under-articulates length distinctions can make two unrelated words sound identical. Finnish's long compound words are also a real test for any chunking logic — a technical or bureaucratic compound can run well past what a naive word-boundary splitter expects before it hits a natural break.
Nothing you paste is uploaded
This is the part that separates in-browser TTS from the cloud tools that look identical in a browser tab. A cloud tool sends your Finnish text to a server, synthesizes it there, and sends audio back — the page is a remote control. Quick TTS ships the engine to you instead and runs it on your CPU or GPU, so your text is never received by anyone. The test is simple: once the page and its model have loaded, the neural engines keep working with your network disconnected.
That matters most for the documents people actually want read aloud — a contract, a medical letter, coursework, an unpublished draft. It also means there is no "we phonemize non-English text on our server" asterisk, which is not true of every tool advertising local synthesis.
Reading Finnish documents, not just pasted text
PDF, DOCX, EPUB, ODT, RTF, HTML, TXT and Markdown are all parsed in the browser, so a whole Finnish EPUB or a long PDF opens and plays without a byte leaving your machine. A scanned PDF — a photo of text with no text layer — is handled by running OCR locally in WebAssembly rather than uploading the scan, which is precisely the case where local processing is worth the most.
Speed, volume and voice can all be changed mid-read and the current passage replays under the new settings without starting over. Switching the engine itself stops playback, so you press play once to start the new one — there is no mid-read handover of the remaining text between engines.
Frequently asked questions
Is Finnish text-to-speech free?
Yes. Quick TTS reads Finnish with no account, no character limit and no watermark. Synthesis runs in your browser on your own device, so there is no per-character server cost to meter and nothing to gate behind a sign-up.
Is my Finnish text uploaded anywhere?
No. The speech engine ships to your browser and runs locally, so the text you paste is turned into audio on your machine and never sent to a server. That is an architectural property, not a promise in a privacy policy — there is no server in the loop once the page has loaded.
What is the best Finnish TTS voice in the browser?
Supertonic HD is the highest-quality Finnish voice available here — 44.1kHz, running on WebGPU. It is also the only neural Finnish option: Piper ships no Finnish voice and Kokoro is English-only, so the alternative is your operating system's built-in voice. To get Finnish voices rather than English ones, open the app at quick-tts.com/fi/ — the neural voice list follows the page language.
Does it work on a phone?
The Web Speech API engine works on every modern phone with no download, and it is the default so the first play click always works. The neural engines are more demanding: Supertonic HD needs WebGPU and is effectively a desktop feature.
Can I download the Finnish audio?
Yes, as WAV or MP3, generated on your device. Anything longer than about 20,000 characters is packaged as a ZIP of audio parts so memory stays bounded on long documents.
Try it in Finnish — open the Suomi app, not the English one
This is the one piece of setup worth knowing, because it is not obvious: the neural voice list follows the language of the page you are on. On the English homepage the Supertonic reads with the English language tag — so Finnish text pasted there will be pronounced as though it were English. Open the Suomi version instead and the engine picks up Finnish automatically.
The one exception is Supertonic's "Auto language" toggle, which switches generation to a language-agnostic mode that reads mixed-language text with the right pronunciation per language without tagging anything by hand. That works from any page — it is the right choice for a document that is part Finnish and part English.
For the architecture behind all of this, see how in-browser text-to-speech works; for a tool-by-tool comparison with the other local TTS sites, see the comparison page.