Works with any backend npm install Zero dependencies

9 built-in locales, fully extensible registry

MultipleUpload ships with 20 built-in locales - English, Spanish, French, German, Japanese, Simplified Chinese, Brazilian Portuguese, Italian, Dutch, Russian, Polish, Turkish, Korean, Czech, Vietnamese, Thai, Indonesian, Hindi, plus Arabic and Hebrew with right-to-left support. Pick a language below - buttons, drag-drop hints, status text, error messages, and the media-capture modals all switch instantly. Add your own locale with one call to MultipleUpload.registerLocale().

What changes: the file-picker button label, the drag-drop instruction, the queue status badges (uploading / complete / failed), validation error messages, and the modal titles for image editor / webcam / screen / audio capture. Custom options.buttonText always wins - i18n only fills in defaults.
Switch locale globally
MultipleUpload.setLocale('fr');
new MultipleUpload('#uploader', { uploadUrl: '/api/upload' });
Register a custom locale

Pass a partial dictionary - missing keys fall back to English transparently:

MultipleUpload.registerLocale('sv', {
 selectFiles: 'Välj filer',
 dragDrop: 'Dra och släpp filer här',
 upload: 'Ladda upp',
 cancel: 'Avbryt',
 complete: 'Klar',
 failed: 'Misslyckades',
 fileTooLarge: 'Filen "{name}" ({size}) överskrider maxstorleken {max}.'
 // 30+ other keys fall back to English
});

MultipleUpload.setLocale('sv');
Auto-detect from browser
const lang = navigator.language || 'en';
const supported = ['en','es','fr','de','ja','zh-CN','pt-BR','it','nl'];
MultipleUpload.setLocale(supported.includes(lang) ? lang : lang.split('-')[0] || 'en');
Translation key reference

Full key list - translate only the ones you need:

// UI controls
selectFiles, dragDrop, dropHere, upload, browse,
cancel, remove, retry, pause, resume, clear,
// Status
uploading, complete, failed, cancelled, pending, remaining,
// Validation
maxFilesReached, fileTypeNotAllowed, fileTooLarge, fileTooSmall,
duplicateFile, mimeTypeNotAllowed,
imageTooWide, imageTooTall, imageTooNarrow, imageTooShort,
// Errors
networkError, uploadFailed, invalidResponse, chunkFailed,
// Stats
files, totalSize, speed, eta, of,
// Media capture
webcamPhotoTitle, webcamVideoTitle, screenCaptureTitle, audioCaptureTitle,
snap, record, stop, recording,
// Image editor
editorRotate, editorFlip, editorCrop, editorApply, editorSave, editorReset,
// URL import
importFromUrl, importingFrom
Interpolation

String values can include {name}-style placeholders that get filled in at render time:

MultipleUpload.registerLocale('en-pirate', {
 fileTooLarge: 'Arrr, the file "{name}" ({size}) be larger than the limit of {max}!'
});