If you need to translate an XLIFF file online, a general-purpose translation tool won’t help — and will likely break the file entirely. XLIFF is a structured XML format designed to carry translatable strings between CAT tools, mobile frameworks, and development environments. Treating it like a plain document corrupts the very structure that makes it useful. This guide covers what XLIFF files are, who needs to translate them, and the right way to do it in 2026.
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TL;DR
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Short answer
To translate an XLIFF file online, you need a tool that understands its XML structure — not a general translator. Upload your .xliff or .xlf file to Lara Translate, select your language pair, and download a structurally identical translated file with all inline tags, trans-unit IDs, and metadata preserved.
Why it matters: XLIFF is the handshake format of the localization industry. It’s what Trados, memoQ, Xcode, and Angular produce when you extract strings for translation, and what they expect back. A corrupted XLIFF file means a failed import, broken UI strings, or worse — a silent build where some strings simply don’t appear.
Translate XLIFF files instantly
Upload your .xliff or .xlf file. Lara translates it as structured XML — preserving all tags, IDs, and segmentation. Compatible with Trados, memoQ, Xcode, and Angular.
What Is an XLIFF File?
XLIFF stands for XML Localization Interchange File Format. It was designed to solve one specific problem: how do you move translatable text between different tools, teams, and systems without losing the technical structure it’s embedded in?
The format stores source strings and their translations inside a structured XML document, organized into <trans-unit> blocks. Each block contains a <source> element (the original text) and a <target> element (where the translation goes). Surrounding all of that is metadata: file identifiers, language codes, tool information, and inline formatting tags that map back to the original content.
XLIFF comes in two versions still in active use: XLIFF 1.2 (the older, more widely supported standard, used by iOS, Angular, and Symfony) and XLIFF 2.0 (the newer spec with improved modularity). Lara Translate supports both.
Here’s a minimal example of XLIFF 1.2 structure:
<trans-unit id="login.button.label">
<source>Sign in</source>
<target>Anmelden</target>
</trans-unit>Real-world XLIFF files from iOS apps or Trados projects are full of inline elements — <x id="1"/>, <g id="2">, or <bpt>/<ept> pairs — that represent placeholders, links, or UI formatting. These must survive translation entirely intact.
Who Uses XLIFF Files — and Why
XLIFF is the format of choice wherever structured, repeatable localization is happening:
- Professional translators working with CAT tools like Trados, memoQ, or Phrase export XLIFF files to share work across teams, freelancers, and language service providers
- iOS and macOS developers use XLIFF natively — Xcode generates .xliff files when you export a project for localization
- Angular developers rely on XLIFF for i18n, using
ng extract-i18nto produce .xlf files ready for translation - Symfony PHP developers use XLIFF as a translation catalog format for web applications
- eLearning developers export XLIFF from authoring tools to manage multilingual course content
The common thread: XLIFF is used when translation needs to be systematic, repeatable, and tool-compatible.
Three Ways to Translate an XLIFF File
Not all approaches handle the XML structure equally well.
Option 1 — Lara Translate (format-safe, online)
Lara’s XLIFF translator processes the file as XML: it reads <source> elements, translates only the human-readable text, and writes the output into <target> elements — without touching trans-unit IDs, inline tags, or file metadata. You upload a file, select your language pair, and download a structurally identical translated file.
Option 2 — Professional CAT tools (Trados, memoQ, Phrase)
If you’re already inside a CAT environment, these tools handle XLIFF natively with full translation memory and termbase integration. The disadvantage is overhead: project configuration, licensing, and a translator on the other end. For one-off translations or small teams, this is overkill.
Option 3 — Copy-paste into Google Translate or a general AI tool
This seems fast but is dangerous. General translation tools don’t understand XLIFF structure. They’ll translate the XML tags themselves, mangle trans-unit IDs, or introduce characters that break XML well-formedness. The resulting file will fail to import into any CAT tool or app framework.
How to Translate an XLIFF File with Lara — Step by Step
- Go to laratranslate.com/translate-xliff
- Upload your .xliff or .xlf file
- Select your source and target languages (200+ supported)
- Choose a translation style: Faithful, Fluid, or Creative
- Click Translate
- Download the translated XLIFF file and re-import it into your CAT tool or application framework
The whole process takes seconds for most files. Lara preserves all XML structure, inline tags, and trans-unit IDs automatically.
What to Check After Translating an XLIFF File
Even with a format-safe tool, a post-translation review is good practice before re-importing your file.
Tag count: Every inline tag in the source should have a corresponding tag in the translation. A missing <x id="1"/> means a broken placeholder — your UI will display raw code instead of the intended value.
Trans-unit IDs: These should be identical between source and target. A tool that alters the id attribute produces a file your app framework can’t map back to the correct UI element.
Target language length: German UI strings can run 30–40% longer than English. Check that translated strings won’t overflow buttons or form fields.
Proper nouns and brand names: Product names and trademarked terms should remain untranslated unless your style guide says otherwise. Build a glossary in Lara to enforce this automatically.
Ready to translate your XLIFF file?
Lara supports XLIFF 1.2 and 2.0, preserves all inline tags and trans-unit IDs, and is compatible with Trados, memoQ, Xcode, and Angular. No credit card required.
FAQ
Does Lara preserve XLIFF tags during translation?
Yes. Lara’s XLIFF processor reads the XML structure and only translates text content inside <source> elements. Inline tags like <x/>, <g>, <bpt>, and <ept> are preserved exactly as they appear in the source file.
Which XLIFF versions does Lara support?
Lara supports both XLIFF 1.2 and XLIFF 2.0 — the two versions currently in active use across CAT tools, iOS, Angular, and Symfony projects.
Can I translate XLIFF files from Trados or memoQ with Lara?
Yes. XLIFF files exported from Trados, memoQ, Phrase, and most other professional CAT tools are fully compatible. After translation, re-import the file directly back into your CAT tool or pass it to your development team.
Can I translate multiple XLIFF files at once?
Yes. Lara supports bulk uploads, so you can translate an entire localization package — multiple language files from a single project — in one session.
Is XLIFF translation free with Lara?
Lara offers a free tier with no credit card required. For large files or high-volume projects, see the pricing page.
This article is about
- Explaining what XLIFF files are and why they require a structure-aware translation approach rather than a general-purpose tool.
- Comparing methods for translating XLIFF files online: format-safe tools, professional CAT environments, and risky plain-text approaches.
- Walking through the step-by-step workflow for translating an XLIFF file with Lara Translate.
- Helping translators, developers, and localization managers choose the right method for their project and team setup.
- Covering post-translation validation: tag integrity, trans-unit ID preservation, text expansion, and glossary enforcement.
Translate Your XLIFF File
Upload your .xliff or .xlf file at laratranslate.com/translate-xliff and get an accurate, tag-safe translation compatible with any CAT tool or development framework.
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