--- title: "Meilleure application de traduction hors ligne pour documents privés en 2026" description: "La plupart des applications de traduction envoient votre texte à un serveur. Voici ce que signifie réellement la traduction hors ligne, quels fichiers elle gère et quand l’utiliser." canonical: "https://www.yaps.ai/fr/blog/best-offline-translation-app" language: "fr-FR" --- Entrée 07 Guide · 27 AUG 2026 # Meilleure application de traduction hors ligne pour documents privés en 2026 Chaque traducteur gratuit en ligne est un formulaire que vous remplissez avec des informations que vous ne possédez peut-être pas. Qu’il s’agisse d’un contrat, d’une lettre médicale ou d’un scénario inédit, c’est une décision qui mérite d’être prise délibérément plutôt que par habitude. Voici ce que fait réellement la traduction hors ligne et les points où elle reste insuffisante. Yaps Team 14 minutes de lecture [Retour au journal](/fr/blog) **Dans cette entrée** ENTRÉE 07 · 8 SECTIONS - [0.0 Préface](#preface) - [1.0 Ce que devrait réellement signifier « traduction hors ligne »](#what-offline-translation-should-actually-mean) - [2.0 Le compromis honnête](#the-honest-trade-off) - [3.0 La place de Yaps](#where-yaps-fits) - [4.0 Les trois workflows qui apparaissent réellement](#the-three-workflows-that-actually-come-up) - [5.0 Vérification du résultat, que la plupart des guides ignorent](#checking-the-output-which-most-guides-skip) - [6.0 Une note sur le travail réglementé](#a-note-on-regulated-work) - [7.0 Foire aux questions](#frequently-asked-questions) - [·Quelle est la meilleure application de traduction hors ligne ?](#what-is-the-best-offline-translation-app) - [·La traduction hors ligne fonctionne-t-elle sans Internet ?](#does-offline-translation-work-without-any-internet-at-all) - [·Quels types de fichiers Yaps peut-il traduire ?](#which-file-types-can-yaps-translate) - [·La traduction hors ligne est-elle aussi précise que Google Translate ou DeepL ?](#is-offline-translation-as-accurate-as-google-translate-or-deepl) Entrée 07 · Le journal Yaps 27 AUG 2026 · 14 minutes de lecture Guider ![Une seule ligne de braise transportant un bloc de texte d'une forme à une autre entièrement à l'intérieur d'une limite dessinée, sans qu'aucun chemin ne la quitte](/images/blog/best-offline-translation-app.jpg) 0.0 ## Préface Paste a paragraph into a free web translator and you have made a decision, whether or not you noticed making it. That text is now on somebody else's computer. For a restaurant menu, nobody cares. For a client contract, an unreleased script, a medical letter, or a witness statement, it is a different matter entirely. The text was probably not yours to upload. Offline translation solves that by doing the work on your own machine. This guide covers what that actually means, what it is genuinely good at, and the cases where you should still use a cloud service instead. 01 / Where it runs On device The text never leaves the computer it started on 02 / Cost per word 0 No API key, no metering, no per-character billing 03 / File types 3 Markdown, plain text and SRT subtitle files 04 / Works offline After setup Download a language pack once, then no connection needed Essayez-le vous-même Vous auriez pu dicter tout cet article maintenant. Yaps transforme votre voix en texte clair. Sur votre appareil, même hors ligne. [Télécharger Yaps](/fr/telecharger)iPhone · Android · Windows · Mac · Linux 1.0 ## Ce que devrait réellement signifier « traduction hors ligne » The phrase gets used loosely, so it is worth pinning down. A genuinely offline translator has three properties. **The text never leaves your machine.** Not "encrypted in transit", not "deleted after 30 days", not "we do not train on your data". Those are policies, and policies change with a funding round. Offline means there is nothing to change the policy about. **It keeps working with no connection.** On a plane, in a secure facility, on a train through a tunnel, or on a site with no signal. If it stops working when the wifi drops, it was never local. **It does not meter you.** Cloud translation is billed per character, which quietly shapes behaviour. You start translating the important paragraph rather than the whole document, because the whole document costs money. Key Takeaway ¶ Most tools marketed as "private translation" are cloud services with a good privacy policy. That is a meaningfully weaker promise than software that has no server to send anything to, and the difference only shows up on the day the policy changes. 2.0 ## Le compromis honnête Local translation is not free of cost. It buys privacy and pays for it in three currencies, and you should know the exchange rate before committing. **Quality.** The largest cloud translation systems are very good, and on hard material, idiom, humour, poetry, legal nuance, they are usually better than what runs on a laptop. For gist and for working drafts, local output is more than adequate. For a contract that will be signed in another language, you want a professional human translator regardless of which machine produced the first pass. **Setup.** You download a language pack once per language pair. It is a real download and it takes a moment. After that it is instant and free forever, but the first run is not. **Language coverage.** A cloud service offers a very long list. A local system offers the pairs it has packs for. Check that your pair is supported before you build a workflow on it. > The right question is not which translator is best. It is which translator you are allowed to paste this particular document into. > > > Yaps 3.0 ## La place de Yaps Yaps translates on your own computer: a note, a selected paragraph, or a file. It runs in the desktop app on **macOS, Windows and Linux**. It is not part of the mobile app. Being precise about the file types, because this is where vague marketing does real damage: Yaps translates **Markdown (.md), plain text (.txt) and SRT subtitle files (.srt)**. It does not accept a Word document, a PDF, a spreadsheet or a slide deck directly. If your source is a PDF, you convert it to text first and translate that. You download a language pack once for the pair you need, and from then on it works with no connection, no API key, and no cost per word. Step 01 ### Get your text into a supported format 1 min A note in Yaps already works. Otherwise save your source as .md, .txt or .srt. A PDF needs converting to text first. Step 02 ### Download the language pack once one-off Pick your language pair. Some pairs need an additional model downloaded before they are available. This step needs a connection; nothing after it does. Step 03 ### Translate and review seconds Translate the note, the selection, or the file. A subtitle file comes back as a translated sibling file with its timing structure intact. 4.0 ## Les trois workflows qui apparaissent réellement **A private note or draft.** You wrote something in one language and need it in another, and it is not material you would paste into a web form. Client notes, interview transcripts, internal documents, early drafts. This is the everyday case. **A subtitle file.** Translating an SRT is its own problem, because a general translator treats the timecodes as text and mangles the file. A subtitle-aware translation keeps the numbering and timing intact and translates only the dialogue. We covered that specific job in the [guide to translating SRT files](/blog/translate-srt-subtitles), and it pairs with [generating the subtitles in the first place](/blog/video-captions-subtitles). **Markdown you are keeping.** Documentation, notes, a knowledge base. Markdown survives translation better than a word processor file because the formatting is plain characters rather than hidden structure that a translator can break. Reach for the cloud when ### Coverage or polish is the point An unusual language pair, marketing copy where phrasing carries the value, idiom-heavy dialogue, or anything being published in your name in a language you cannot read. The best cloud systems are genuinely better on hard material, and the text is not confidential. Keep it local when ### The text is not yours to upload Client material, anything under NDA, medical or legal documents, unreleased work, or personal correspondence. Also when you have no connection, or when the document is long enough that per-character billing changes what you are willing to translate. Privé par conception Tout ce que Yaps entend reste sur votre appareil. Dictée, notes vocales et lecture à haute voix. Tout ce que vous dites reste sur votre appareil. [Télécharger Yaps](/fr/telecharger)iPhone · Android · Windows · Mac · Linux 5.0 ## Vérification du résultat, que la plupart des guides ignorent Machine translation fails in specific, predictable ways. Five minutes of checking catches nearly all of it. **Proper nouns.** Names of people, companies and products get "translated" when they should be left alone. This is the single most common embarrassing error. **Numbers and units.** Decimal separators differ between languages, and a comma becoming a full stop changes a figure by a factor of a thousand. Check every number in anything financial or clinical. **Length.** Translated text is often longer than the source. German and Spanish routinely run longer than English. That matters for anything with a fixed space: a button, a table cell, a subtitle line. **Formality.** Many languages distinguish formal and informal address in a way English does not. A machine picks one. Whether it picked correctly for a client letter is a judgement only you can make. **The reverse read.** For anything that matters, have someone who reads the target language look at it. Machine translation is a first draft, not a deliverable. Local translation handles well 05 - Understanding a document gist, meaning, and what a page is actually about. - Confidential material where uploading is the thing you are trying to avoid. - Long documents where per-character billing would otherwise decide what you translate. - Subtitle files where the structure has to survive, not just the words. - Working with no connection once the language pack is downloaded. Where it is not the answer 05 - Word, PDF or slides not accepted directly; convert to text first. - Mobile translation is a desktop feature and is not in the phone app. - Live conversation this translates text, not a two-way spoken exchange. - Certified translation legal and official documents need a qualified human translator. - Unsupported language pairs check yours is available before building a workflow on it. 6.0 ## Une note sur le travail réglementé If you handle client data under a professional duty, legal, medical, financial, social work, then pasting that text into a consumer web translator is a data transfer, and quite possibly one you are not permitted to make. It rarely feels like one, because the interface is a text box. Local translation removes the question rather than answering it. There is no transfer to disclose, no processor to add to a register, and no retention period to check. That is a materially simpler position to be in than having read a privacy policy carefully. This is not legal advice, and your own obligations may be stricter. But "the text never left the machine" is an easier sentence to defend than any explanation involving a third party. 01 Essayez Yaps ## Translate a confidential note without it leaving your computer. Translation runs in the Yaps desktop app on macOS, Windows and Linux. Download a language pack once, then it works offline with no cost per word. [Télécharger Yaps](/fr/telecharger)or[yaps.ai](/fr) Scannez avec l'appareil photo de votre téléphone 7.0 ## Foire aux questions ### What is the best offline translation app? For private documents on a computer, the useful criteria are that the text stays on your machine, it keeps working with no connection, and it handles the file types you actually have. Yaps translates notes, selected text, Markdown, plain text and SRT subtitle files locally on macOS, Windows and Linux. For unusual language pairs or published marketing copy, a large cloud service will generally produce better output, and that text is usually not confidential anyway. ### Does offline translation work without any internet at all? Yes, once the language pack is downloaded. That first download needs a connection. After it completes, translation runs entirely on your machine, including on a plane, in a secure facility, or anywhere with no signal. ### Which file types can Yaps translate? Markdown (.md), plain text (.txt) and SRT subtitle files (.srt), plus notes and selected passages inside the app. Word documents, PDFs, spreadsheets and slide decks are not accepted directly. If your source is a PDF, convert it to text first and translate that. ### Is offline translation as accurate as Google Translate or DeepL? Not usually on hard material. Large cloud systems have an advantage on idiom, humour, and unusual language pairs. For understanding a document, working drafts, and everyday professional text, local translation is generally more than good enough. The trade you are making is some quality on difficult passages in exchange for the text never leaving your computer. ### Can I translate a PDF offline? Not directly. Convert the PDF to text first, then translate the text. Yaps has free PDF conversion tools on the site for that step. Be aware that converting a PDF loses layout, so you get the words rather than a formatted replica. ### Does Yaps translation work on iPhone or Android? No. Translation is a desktop feature, available in the Yaps app for macOS, Windows and Linux. It is not in the mobile app. ### How do I translate subtitles without breaking the timing? Use a tool that understands the subtitle format rather than a general text translator, which treats the timecodes as text and mangles them. Yaps translates an SRT file and produces a translated version with its numbering and timing structure intact. Our [guide to translating SRT files](/blog/translate-srt-subtitles) covers the whole workflow including the reading-speed problems that translation introduces. ### Is it safe to translate confidential documents online? Pasting confidential text into a web translator is a data transfer to a third party, whatever the privacy policy says. For client material, medical or legal documents, or anything under NDA, that is a decision worth making deliberately rather than by habit. Local translation avoids the question because there is no transfer. ### Does it cost anything per word? No. Local translation has no per-character billing, no API key, and no metering. That changes behaviour in a practical way: you translate the whole document rather than only the paragraph you decided was worth paying for. ### What languages are supported? Yaps supports a set of language pairs, each requiring a one-off pack download, and some pairs need an additional model before they become available. Because the list changes as packs are added, check the current options in the app for your specific pair rather than relying on a number in an article. ### Will translated text be longer than the original? Often, yes. German and Spanish commonly run longer than English. This matters wherever space is fixed: buttons, table cells, and especially subtitles, where a longer line may not fit the time it is on screen. Budget for some manual trimming. ### What should I always check in a machine translation? Proper nouns, which get translated when they should be left alone; numbers and decimal separators, since a comma becoming a full stop changes a figure enormously; formality, because many languages distinguish formal and informal address and the machine simply picks one; and length, wherever space is constrained. ### Can this replace a professional translator? No, and it should not be presented as one. For anything being signed, published, or submitted officially, machine translation is a first draft and a qualified human translator does the work. Certified translation in particular is a formal process that no software output satisfies. ### Why does the first translation require a download? Because the translation model itself has to live on your machine for the work to happen there. That is the same trade every offline tool makes: a one-off download in exchange for never needing a server afterwards. It is a fixed cost paid once per language pair rather than a running cost paid per character forever. Le journal Yaps est écrit avec Yaps Mettez votre voix au travail. Discours désordonné, texte propre prêt à coller. Privé, hors ligne d'abord et gratuit pour démarrer. [Télécharger Yaps](/fr/telecharger)iPhone · Android · Windows · Mac · Linux Continuez à lire ## Continuez à lire [GUIDE · 12 MIN READ Ebook to Audiobook: Turn an EPUB or PDF Into Audio](/fr/blog/ebook-to-audiobook) [GUIDE · 10 MIN READ 10 Ways to Stop Saying Um When You Speak](/fr/blog/how-to-stop-saying-um) **Journal Yaps** · 2026 · Entrée 07 [À propos](/fr/a-propos) [Marque](/fr/marque) [Carrières](/fr/carrieres) [RSS](/blog/rss.xml) [Archiver](/fr/blog) [Plan du site](/sitemap.xml)