Chethan616 · Chethan616 · Aug 10, 2026 · Aug 10, 2026
diff --git a/THIRD_PARTY_NOTICES.md b/THIRD_PARTY_NOTICES.md
@@ -0,0 +1,25 @@
+# Third-party notices
+
+ClearPDF uses open-source components and keeps their notices with the project. Release packaging must preserve the applicable copyright and license text.
+
+## Apache PDFBox Android
+
+- Artifact: `com.tom-roush:pdfbox-android:2.0.27.0`
+- License: Apache License 2.0
+- Use: PDF parsing, editing, merging, splitting, and password removal.
+- Notice practice: keep the Apache 2.0 license and upstream attribution available with redistributed builds. Do not imply that the Apache Software Foundation endorses ClearPDF.
+
+## Apache POI
+
+- Artifacts: `org.apache.poi:poi:3.17`, `org.apache.poi:poi-scratchpad:3.17`
+- License: Apache License 2.0
+- Use: text extraction from legacy `.doc`, `.xls`, and `.ppt` files. Modern Office Open XML files use the platform ZIP/XML parser for a smaller footprint.
+- Notice practice: retain the Apache 2.0 license and any bundled dependency notices when distributing an APK or source package.
+
+## AndroidLiquidGlass / Backdrop
+
+- Component: `AndroidLiquidGlass` / the local `backdrop` module
+- License: Apache License 2.0 (as attributed in the Settings screen)
+- Use: the app's translucent glass surfaces, backdrop effects, and shared UI components.
+
+The app does not add GPL or LGPL components for document rendering. If a future dependency changes that, its license and redistribution obligations must be reviewed before release.
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
@@ -40,7 +40,9 @@ android {
         targetSdk = 36
         versionCode = 2
         versionName = "1.1.0"
-        androidResources.localeFilters += arrayOf("en")
+        // Keep every locale declared by the app. Filtering this to English
+        // removes values-pt-rBR from the packaged APK, so the language picker
+        // can appear to work while the app continues to resolve English.
     }
 
     signingConfigs {
@@ -126,6 +128,10 @@ dependencies {
     implementation(libs.kotlinx.serialization.json)
     implementation(project(":backdrop"))
     implementation(project(":pdf-core"))
+    // Apache POI provides legacy .doc/.xls/.ppt text extraction. It is Apache-2.0
+    // licensed; see THIRD_PARTY_NOTICES.md for redistribution requirements.
+    implementation("org.apache.poi:poi:3.17")
+    implementation("org.apache.poi:poi-scratchpad:3.17")
 
     // ML Kit Document Scanner & Camera
     implementation(libs.play.services.mlkit.scanner)

diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
@@ -100,6 +100,13 @@
                 <data android:scheme="content" />
                 <data android:mimeType="application/vnd.openxmlformats-officedocument.presentationml.presentation" />
             </intent-filter>
+            <intent-filter>
+                <action android:name="android.intent.action.VIEW" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+                <data android:scheme="content" />
+                <data android:mimeType="application/vnd.ms-powerpoint" />
+            </intent-filter>
 
             <!-- Open plain text files -->
             <intent-filter>

diff --git a/app/src/main/java/com/chethan616/clearpdf/MainActivity.kt b/app/src/main/java/com/chethan616/clearpdf/MainActivity.kt
@@ -45,7 +45,8 @@ class MainActivity : ComponentActivity() {
             }
         }
 
-        // Handle PDF file opened from other apps (VIEW/SEND)
+        // Handle supported documents opened from other apps (VIEW/SEND).
+        // The viewer converts office/text/image sources into a local PDF preview.
         val incomingPdfUri: Uri? = when (intent?.action) {
             Intent.ACTION_VIEW -> intent.data
             Intent.ACTION_SEND -> {
@@ -57,7 +58,7 @@ class MainActivity : ComponentActivity() {
                 }
             }
             else -> null
-        }?.takeIf { intent?.type == "application/pdf" || intent?.data?.toString()?.endsWith(".pdf") == true }
+        }?.takeIf { uri -> isSupportedDocumentIntent(intent?.type, uri.toString()) }
 
         // If a PDF was shared/opened, navigate to viewer with that URI
         val effectiveRoute = if (incomingPdfUri != null) "pdf_viewer" else shortcutRoute
@@ -67,6 +68,23 @@ class MainActivity : ComponentActivity() {
         }
     }
 
+    private fun isSupportedDocumentIntent(mimeType: String?, uriString: String): Boolean {
+        val lower = uriString.lowercase()
+        val supportedExtension = listOf(
+            ".pdf", ".doc", ".docx", ".ppt", ".pptx", ".xls", ".xlsx", ".csv", ".txt", ".rtf",
+            ".odt", ".ods", ".odp", ".png", ".jpg", ".jpeg", ".webp", ".bmp", ".gif", ".heic"
+        ).any(lower::contains)
+        return mimeType == null ||
+            mimeType == "application/pdf" ||
+            mimeType?.startsWith("image/") == true ||
+            mimeType?.startsWith("text/") == true ||
+            mimeType?.contains("word", ignoreCase = true) == true ||
+            mimeType?.contains("excel", ignoreCase = true) == true ||
+            mimeType?.contains("spreadsheet", ignoreCase = true) == true ||
+            mimeType?.contains("presentation", ignoreCase = true) == true ||
+            supportedExtension
+    }
+
     private fun requestHighRefreshRate() {
         // Prefer the display mode with the highest refresh rate
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {

diff --git a/app/src/main/java/com/chethan616/clearpdf/data/repository/SignatureManager.kt b/app/src/main/java/com/chethan616/clearpdf/data/repository/SignatureManager.kt
@@ -25,16 +25,37 @@ object SignatureManager {
             ?.sortedByDescending { it.lastModified() }
             ?: emptyList()
 
-    /** Saves a transparent-background signature bitmap; returns the saved file. */
-    fun saveSignature(context: Context, bitmap: Bitmap): File {
-        val file = File(dir(context), "sig_${System.currentTimeMillis()}.png")
+    /** Saves a transparent-background signature bitmap using a human-readable name. */
+    fun saveSignature(context: Context, bitmap: Bitmap, name: String = "Signature"): File {
+        val safeName = name
+            .trim()
+            .ifBlank { "Signature" }
+            .replace(Regex("[^\\p{L}\\p{N}\\-_ ]"), "")
+            .trim()
+            .replace(Regex("\\s+"), "_")
+            .take(48)
+            .ifBlank { "Signature" }
+        val file = File(dir(context), "${safeName}_${System.currentTimeMillis()}.png")
         FileOutputStream(file).use { out ->
             bitmap.compress(Bitmap.CompressFormat.PNG, 100, out)
             out.flush()
         }
         return file
     }
 
+    /** Returns the display name stored in a signature filename. */
+    fun displayName(file: File): String {
+        val base = file.nameWithoutExtension
+        val withoutTimestamp = base.substringBeforeLast('_').takeIf {
+            base.substringAfterLast('_').toLongOrNull() != null
+        } ?: base
+        return withoutTimestamp
+            .removePrefix("sig")
+            .replace('_', ' ')
+            .trim()
+            .ifBlank { "Signature" }
+    }
+
     /** Loads a signature from file. Returns null if the file is missing or corrupt. */
     fun loadSignature(file: File): Bitmap? = try {
         val options = BitmapFactory.Options().apply {

diff --git a/app/src/main/java/com/chethan616/clearpdf/ui/DocsApp.kt b/app/src/main/java/com/chethan616/clearpdf/ui/DocsApp.kt
@@ -34,7 +34,9 @@ import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.layout.ContentScale
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalResources
 import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextAlign
@@ -67,6 +69,9 @@ import kotlinx.coroutines.flow.collectLatest
 fun DocsApp(shortcutRoute: String? = null, incomingPdfUri: android.net.Uri? = null) {
     val context = LocalContext.current
     var selectedLocale by rememberSaveable { mutableStateOf<String>(OnboardingManager.getSelectedLocale(context)) }
+    val localizedContext = remember(context, selectedLocale) {
+        com.chethan616.clearpdf.ui.utils.LocaleHelper.getLocalizedContext(context, selectedLocale)
+    }
 
     var themeMode by rememberSaveable { mutableIntStateOf(AppSettingsManager.getThemeMode(context)) }
     var showStarPrompt by rememberSaveable { mutableStateOf(false) }
@@ -154,13 +159,8 @@ fun DocsApp(shortcutRoute: String? = null, incomingPdfUri: android.net.Uri? = nu
             contentScale = ContentScale.Crop
         )
 
-        LaunchedEffect(selectedLocale) {
-            if (selectedLocale.isNotBlank()) {
-                com.chethan616.clearpdf.ui.utils.LocaleHelper.applyLocale(context, selectedLocale, recreate = false)
-            }
-        }
-
         CompositionLocalProvider(
+            LocalResources provides localizedContext.resources,
             LocalIsDarkMode provides isDarkMode
         ) {
             Box(Modifier.fillMaxSize()) {
@@ -176,6 +176,19 @@ fun DocsApp(shortcutRoute: String? = null, incomingPdfUri: android.net.Uri? = nu
                         themeMode = it
                         AppSettingsManager.setThemeMode(context, it)
                     },
+                    selectedLocale = selectedLocale,
+                    onLocaleChanged = { code ->
+                        val normalized = com.chethan616.clearpdf.ui.utils.LocaleHelper.normalizeForUi(code)
+                        if (normalized != selectedLocale) {
+                            selectedLocale = normalized
+                            com.chethan616.clearpdf.ui.utils.LocaleHelper.applyLocale(
+                                context = context,
+                                languageTag = normalized,
+                                recreate = false,
+                                updateAppCompat = false
+                            )
+                        }
+                    },
                     incomingPdfUri = incomingPdfUri
                 )
 
@@ -247,11 +260,11 @@ fun DocsApp(shortcutRoute: String? = null, incomingPdfUri: android.net.Uri? = nu
                                 Modifier.size(52.dp), starAccent
                             )
                             BasicText(
-                                "Support ClearPDF",
+                                stringResource(R.string.star_prompt_title),
                                 style = TextStyle(starText, 20.sp, FontWeight.Bold, textAlign = TextAlign.Center)
                             )
                             BasicText(
-                                "ClearPDF is open source on GitHub.\nWould you like to star the project?",
+                                stringResource(R.string.star_prompt_message),
                                 style = TextStyle(starSub, 14.sp, textAlign = TextAlign.Center)
                             )
                             Spacer(Modifier.height(4.dp))
@@ -270,7 +283,7 @@ fun DocsApp(shortcutRoute: String? = null, incomingPdfUri: android.net.Uri? = nu
                                     verticalAlignment = Alignment.CenterVertically
                                 ) {
                                     Icon(Icons.Rounded.Star, null, Modifier.size(18.dp), Color.White)
-                                    BasicText("Yes, Star It", style = TextStyle(Color.White, 15.sp, FontWeight.SemiBold))
+                                    BasicText(stringResource(R.string.star_prompt_accept), style = TextStyle(Color.White, 15.sp, FontWeight.SemiBold))
                                 }
                             }
                             Row(
@@ -279,7 +292,7 @@ fun DocsApp(shortcutRoute: String? = null, incomingPdfUri: android.net.Uri? = nu
                                 verticalAlignment = Alignment.CenterVertically
                             ) {
                                 BasicText(
-                                    "Not Now",
+                                    stringResource(R.string.star_prompt_later),
                                     style = TextStyle(starSub, 13.sp, FontWeight.Medium, textAlign = TextAlign.Center),
                                     modifier = Modifier
                                         .clickable {
@@ -293,7 +306,7 @@ fun DocsApp(shortcutRoute: String? = null, incomingPdfUri: android.net.Uri? = nu
                                     style = TextStyle(starSub.copy(0.4f), 13.sp)
                                 )
                                 BasicText(
-                                    "Don't Ask Again",
+                                    stringResource(R.string.star_prompt_never),
                                     style = TextStyle(starSub.copy(0.7f), 13.sp, FontWeight.Medium, textAlign = TextAlign.Center),
                                     modifier = Modifier
                                         .clickable {

diff --git a/app/src/main/java/com/chethan616/clearpdf/ui/components/DocsBottomTabs.kt b/app/src/main/java/com/chethan616/clearpdf/ui/components/DocsBottomTabs.kt
@@ -7,11 +7,13 @@ import androidx.compose.material.icons.rounded.GridView
 import androidx.compose.material.icons.rounded.Tune
 import androidx.compose.material3.Icon
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.unit.dp
 import com.chethan616.clearpdf.ui.theme.LiquidGlassColors
 import com.chethan616.clearpdf.ui.theme.LocalIsDarkMode
+import com.chethan616.clearpdf.R
 import com.kyant.backdrop.Backdrop
 
 @Composable
@@ -32,17 +34,17 @@ fun DocsBottomTabs(
         modifier = modifier
     ) {
         LiquidBottomTab(onClick = { onTabSelected(0) }) {
-            Icon(Icons.Rounded.Home, contentDescription = "Home", tint = tint,
+            Icon(Icons.Rounded.Home, contentDescription = stringResource(R.string.nav_home), tint = tint,
                 modifier = Modifier.size(22.dp))
         }
 
         LiquidBottomTab(onClick = { onTabSelected(1) }) {
-            Icon(Icons.Rounded.GridView, contentDescription = "Tools", tint = tint,
+            Icon(Icons.Rounded.GridView, contentDescription = stringResource(R.string.nav_tools), tint = tint,
                 modifier = Modifier.size(22.dp))
         }
 
         LiquidBottomTab(onClick = { onTabSelected(2) }) {
-            Icon(Icons.Rounded.Tune, contentDescription = "Settings", tint = tint,
+            Icon(Icons.Rounded.Tune, contentDescription = stringResource(R.string.nav_settings), tint = tint,
                 modifier = Modifier.size(22.dp))
         }
     }

diff --git a/app/src/main/java/com/chethan616/clearpdf/ui/components/LiquidButton.kt b/app/src/main/java/com/chethan616/clearpdf/ui/components/LiquidButton.kt
@@ -34,6 +34,8 @@ import kotlin.math.tanh
 import androidx.compose.material3.Icon
 import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.graphics.vector.PathParser
+import androidx.compose.ui.res.stringResource
+import com.chethan616.clearpdf.R
 
 private const val CLOSE_CROSS_SVG_PATH =
     "M480-424 284-228q-11 11-28 11t-28-11q-11-11-11-28t11-28l196-196-196-196q-11-11-11-28t11-28q11-11 28-11t28 11l196 196 196-196q11-11 28-11t28 11q11 11 11 28t-11 28L536-480l196 196q11 11 11 28t-11 28q-11 11-28 11t-28-11L480-424Z"
@@ -55,7 +57,7 @@ fun CloseCrossIcon(modifier: Modifier = Modifier, tint: Color = Color.White) {
             fill = androidx.compose.ui.graphics.SolidColor(tint)
         ).build()
     }
-    Icon(vector, contentDescription = "Close", modifier = modifier, tint = tint)
+    Icon(vector, contentDescription = stringResource(R.string.close), modifier = modifier, tint = tint)
 }
 
 /**

diff --git a/app/src/main/java/com/chethan616/clearpdf/ui/components/LiquidSaveDialog.kt b/app/src/main/java/com/chethan616/clearpdf/ui/components/LiquidSaveDialog.kt
@@ -19,13 +19,15 @@ import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.SolidColor
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.compose.ui.window.Dialog
 import androidx.compose.ui.window.DialogProperties
 import com.chethan616.clearpdf.data.repository.SaveLocationManager
+import com.chethan616.clearpdf.R
 import com.chethan616.clearpdf.ui.theme.LocalIsDarkMode
 import com.chethan616.clearpdf.ui.utils.UISensor
 import com.kyant.backdrop.Backdrop
@@ -59,7 +61,7 @@ fun LiquidSaveDialog(
                 context.contentResolver.takePersistableUriPermission(uri, flags)
             } catch (_: Exception) {}
             locationUri = uri
-            locationDisplay = uri.lastPathSegment?.replace("primary:", "") ?: "Selected Folder"
+            locationDisplay = uri.lastPathSegment?.replace("primary:", "") ?: context.getString(R.string.selected_folder)
         }
     }
 
@@ -75,13 +77,13 @@ fun LiquidSaveDialog(
             verticalArrangement = Arrangement.spacedBy(20.dp)
         ) {
             BasicText(
-                "Save Document",
+                stringResource(R.string.save_document),
                 style = TextStyle(color = text, fontSize = 20.sp, fontWeight = FontWeight.SemiBold)
             )
 
             // File Name Input
             Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
-                BasicText("File Name", style = TextStyle(color = sub, fontSize = 13.sp, fontWeight = FontWeight.Medium))
+                BasicText(stringResource(R.string.file_name), style = TextStyle(color = sub, fontSize = 13.sp, fontWeight = FontWeight.Medium))
                 BasicTextField(
                     value = fileName,
                     onValueChange = { fileName = it },
@@ -94,7 +96,7 @@ fun LiquidSaveDialog(
                         .padding(14.dp),
                     decorationBox = { inner ->
                         if (fileName.isEmpty()) {
-                            BasicText("Document.pdf", style = TextStyle(color = sub.copy(0.5f), fontSize = 16.sp))
+                            BasicText(stringResource(R.string.document_pdf), style = TextStyle(color = sub.copy(0.5f), fontSize = 16.sp))
                         }
                         inner()
                     }
@@ -103,7 +105,7 @@ fun LiquidSaveDialog(
 
             // Save Location Picker
             Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
-                BasicText("Save Location", style = TextStyle(color = sub, fontSize = 13.sp, fontWeight = FontWeight.Medium))
+                BasicText(stringResource(R.string.settings_save_location), style = TextStyle(color = sub, fontSize = 13.sp, fontWeight = FontWeight.Medium))
                 LiquidButton(
                     onClick = { folderPicker.launch(null) },
                     backdrop = backdrop,
@@ -119,7 +121,7 @@ fun LiquidSaveDialog(
                             BasicText(locationDisplay, style = TextStyle(color = text, fontSize = 14.sp), maxLines = 1)
                         }
                         Spacer(Modifier.width(8.dp))
-                        Icon(Icons.Rounded.FolderOpen, "Change Folder", Modifier.size(20.dp), accent)
+                        Icon(Icons.Rounded.FolderOpen, stringResource(R.string.change_folder), Modifier.size(20.dp), accent)
                     }
                 }
             }
@@ -135,7 +137,7 @@ fun LiquidSaveDialog(
                     backdrop = backdrop,
                     surfaceColor = Color.Transparent
                 ) {
-                    BasicText("Cancel", style = TextStyle(color = sub, fontSize = 14.sp, fontWeight = FontWeight.Medium))
+                    BasicText(stringResource(R.string.cancel), style = TextStyle(color = sub, fontSize = 14.sp, fontWeight = FontWeight.Medium))
                 }
                 Spacer(Modifier.width(8.dp))
                 LiquidButton(
@@ -147,8 +149,8 @@ fun LiquidSaveDialog(
                     tint = accent
                 ) {
                     Row(horizontalArrangement = Arrangement.spacedBy(6.dp), verticalAlignment = Alignment.CenterVertically) {
-                        Icon(Icons.Rounded.Save, "Save", Modifier.size(16.dp), Color.White)
-                        BasicText("Save", style = TextStyle(color = Color.White, fontSize = 14.sp, fontWeight = FontWeight.SemiBold))
+                        Icon(Icons.Rounded.Save, stringResource(R.string.save), Modifier.size(16.dp), Color.White)
+                        BasicText(stringResource(R.string.save), style = TextStyle(color = Color.White, fontSize = 14.sp, fontWeight = FontWeight.SemiBold))
                     }
                 }
             }