diff --git a/backend/app.py b/backend/app.py
index d00b054..9ce19da 100644
--- a/backend/app.py
+++ b/backend/app.py
@@ -8,6 +8,7 @@ import logging
 from pathlib import Path
 import uuid
 import pdf2image
+from multipart_handler import MultipartHandler, default_handler
 
 # Add the parent directory to Python path to allow imports
 sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
@@ -24,6 +25,8 @@ app = Flask(__name__,
             static_folder=os.path.join(frontend_path, 'static'),
             static_url_path='/static')
 
+app.config['MAX_CONTENT_LENGTH'] = 100 * 1024 * 1024  # 100MB
+
 # Dictionary to store background task results
 task_results = {}
 
@@ -876,6 +879,508 @@ def debug_results():
         return jsonify({'error': str(e)}), 500
 
 # Cleanup task for batch processors
+
+
+@app.route('/api/upload/analyze', methods=['POST'])
+def api_upload_analyze():
+    """
+    API endpoint for uploading and analyzing a PDF file.
+    Expects multipart/form-data with:
+    - file: PDF file
+    - page_num: (optional) Page number to analyze (default: 1)
+    - adjust: (optional) Auto-adjust coordinates (default: true)
+    """
+    try:
+        # Check if file is in request
+        if 'file' not in request.files:
+            return jsonify(default_handler.create_multipart_response(
+                False, {'error': 'No file part in request'}
+            )), 400
+
+        file = request.files['file']
+
+        # Save uploaded file
+        success, result = default_handler.save_uploaded_file(file, permanent=True)
+        if not success:
+            return jsonify(default_handler.create_multipart_response(False, result)), 400
+
+        # Get processing parameters
+        page_num = request.form.get('page_num', '1')
+        adjust = request.form.get('adjust', 'true').lower() == 'true'
+
+        # Run analyzer
+        filepath = result['filepath']
+        command = f"python backend/page_treatment/analyzer.py --image {filepath} --page {page_num} --start-page {page_num} --end-page {page_num}"
+
+        # Generate task ID
+        task_id = f"api_analyzer_{int(time.time() * 1000)}"
+
+        # Initialize task result
+        task_results[task_id] = {
+            'success': None,
+            'output': "Processing uploaded file...",
+            'done': False,
+            'file_info': result
+        }
+
+        # Start background processing
+        thread = threading.Thread(target=run_command, args=(task_id, command))
+        thread.daemon = True
+        thread.start()
+
+        # Return response
+        return jsonify(default_handler.create_multipart_response(True, {
+            'task_id': task_id,
+            'file_info': result,
+            'message': f"Processing started for {result['filename']}, page {page_num}"
+        }))
+
+    except Exception as e:
+        logger.error(f"Error in api_upload_analyze: {str(e)}")
+        return jsonify(default_handler.create_multipart_response(
+            False, {'error': str(e)}
+        )), 500
+
+
+@app.route('/api/upload/process', methods=['POST'])
+def api_upload_process():
+    """
+    API endpoint for uploading and processing a PDF through all stages.
+    Expects multipart/form-data with:
+    - file: PDF file
+    - page_num: (optional) Page number (default: 1)
+    - adjust: (optional) Auto-adjust coordinates (default: true)
+    - stages: (optional) Comma-separated list of stages to run (default: analyzer,visualizer,extractor)
+    """
+    try:
+        # Check if file is in request
+        if 'file' not in request.files:
+            return jsonify(default_handler.create_multipart_response(
+                False, {'error': 'No file part in request'}
+            )), 400
+
+        file = request.files['file']
+
+        # Save uploaded file
+        success, result = default_handler.save_uploaded_file(file, permanent=True)
+        if not success:
+            return jsonify(default_handler.create_multipart_response(False, result)), 400
+
+        # Get processing parameters
+        page_num = request.form.get('page_num', '1')
+        adjust = request.form.get('adjust', 'true').lower() == 'true'
+        stages = request.form.get('stages', 'analyzer,visualizer,extractor').split(',')
+
+        # Create a combined task ID
+        task_id = f"api_process_{int(time.time() * 1000)}"
+
+        # Process through all stages
+        filepath = result['filepath']
+        processing_info = {
+            'task_id': task_id,
+            'file_info': result,
+            'page_num': page_num,
+            'adjust': adjust,
+            'stages': stages,
+            'current_stage': None,
+            'completed_stages': [],
+            'results': {}
+        }
+
+        # Start processing in background
+        def process_all_stages():
+            try:
+                # Run analyzer if requested
+                if 'analyzer' in stages:
+                    processing_info['current_stage'] = 'analyzer'
+                    command = f"python backend/page_treatment/analyzer.py --image {filepath} --page {page_num} --start-page {page_num} --end-page {page_num}"
+
+                    process = subprocess.run(
+                        command,
+                        shell=True,
+                        capture_output=True,
+                        text=True,
+                        input="n\n"
+                    )
+
+                    if process.returncode == 0:
+                        processing_info['completed_stages'].append('analyzer')
+                        processing_info['results']['analyzer'] = {
+                            'success': True,
+                            'doctags_file': 'results/output.doctags.txt'
+                        }
+                    else:
+                        processing_info['results']['analyzer'] = {
+                            'success': False,
+                            'error': process.stderr
+                        }
+                        return
+
+                # Run visualizer if requested
+                if 'visualizer' in stages:
+                    processing_info['current_stage'] = 'visualizer'
+                    command = f"python backend/page_treatment/visualizer.py --doctags results/output.doctags.txt --pdf {filepath} --page {page_num}"
+                    if adjust:
+                        command += " --adjust"
+
+                    process = subprocess.run(
+                        command,
+                        shell=True,
+                        capture_output=True,
+                        text=True
+                    )
+
+                    if process.returncode == 0:
+                        processing_info['completed_stages'].append('visualizer')
+                        processing_info['results']['visualizer'] = {
+                            'success': True,
+                            'visualization_file': f'results/visualization_page_{page_num}.png'
+                        }
+                    else:
+                        processing_info['results']['visualizer'] = {
+                            'success': False,
+                            'error': process.stderr
+                        }
+                        return
+
+                # Run extractor if requested
+                if 'extractor' in stages:
+                    processing_info['current_stage'] = 'extractor'
+                    command = f"python backend/page_treatment/picture_extractor.py --doctags results/output.doctags.txt --pdf {filepath} --page {page_num}"
+                    if adjust:
+                        command += " --adjust"
+
+                    process = subprocess.run(
+                        command,
+                        shell=True,
+                        capture_output=True,
+                        text=True
+                    )
+
+                    if process.returncode == 0:
+                        processing_info['completed_stages'].append('extractor')
+
+                        # Count extracted images
+                        pics_dir = Path("results") / "pictures"
+                        image_count = len(list(pics_dir.glob("*.png"))) if pics_dir.exists() else 0
+
+                        processing_info['results']['extractor'] = {
+                            'success': True,
+                            'images_extracted': image_count,
+                            'pictures_folder': 'results/pictures'
+                        }
+                    else:
+                        processing_info['results']['extractor'] = {
+                            'success': False,
+                            'error': process.stderr
+                        }
+
+                processing_info['current_stage'] = 'completed'
+
+            except Exception as e:
+                processing_info['current_stage'] = 'error'
+                processing_info['error'] = str(e)
+
+        # Store processing info
+        task_results[task_id] = processing_info
+
+        # Start background thread
+        thread = threading.Thread(target=process_all_stages)
+        thread.daemon = True
+        thread.start()
+
+        # Return response
+        return jsonify(default_handler.create_multipart_response(True, {
+            'task_id': task_id,
+            'file_info': result,
+            'stages': stages,
+            'message': f"Processing started for {result['filename']}, page {page_num}"
+        }))
+
+    except Exception as e:
+        logger.error(f"Error in api_upload_process: {str(e)}")
+        return jsonify(default_handler.create_multipart_response(
+            False, {'error': str(e)}
+        )), 500
+
+
+@app.route('/api/upload/batch', methods=['POST'])
+def api_upload_batch():
+    """
+    API endpoint for uploading and batch processing a PDF.
+    Expects multipart/form-data with:
+    - file: PDF file
+    - start_page: (optional) Start page (default: 1)
+    - end_page: (optional) End page (default: all)
+    - parallel: (optional) Enable parallel processing (default: true)
+    - adjust: (optional) Auto-adjust coordinates (default: true)
+    """
+    if not batch_processing_available:
+        return jsonify(default_handler.create_multipart_response(
+            False, {'error': 'Batch processing not available'}
+        )), 503
+
+    try:
+        # Check if file is in request
+        if 'file' not in request.files:
+            return jsonify(default_handler.create_multipart_response(
+                False, {'error': 'No file part in request'}
+            )), 400
+
+        file = request.files['file']
+
+        # Save uploaded file
+        success, result = default_handler.save_uploaded_file(file, permanent=True)
+        if not success:
+            return jsonify(default_handler.create_multipart_response(False, result)), 400
+
+        # Get PDF info
+        filepath = result['filepath']
+        try:
+            from pdf2image.pdf2image import pdfinfo_from_path
+            info = pdfinfo_from_path(filepath)
+            total_pages = info["Pages"]
+        except Exception as e:
+            return jsonify(default_handler.create_multipart_response(
+                False, {'error': f'Failed to read PDF info: {str(e)}'}
+            )), 400
+
+        # Get processing parameters
+        start_page = int(request.form.get('start_page', '1'))
+        end_page = int(request.form.get('end_page', str(total_pages)))
+        parallel = request.form.get('parallel', 'true').lower() == 'true'
+        adjust = request.form.get('adjust', 'true').lower() == 'true'
+
+        # Validate page range
+        start_page = max(1, min(start_page, total_pages))
+        end_page = max(start_page, min(end_page, total_pages))
+
+        # Start batch processing
+        batch_id = f"api_{uuid.uuid4().hex[:8]}"
+        options = {
+            'adjust': adjust,
+            'parallel': parallel,
+            'generate_report': True
+        }
+
+        if start_batch_processing(batch_id, filepath, start_page, end_page, options):
+            return jsonify(default_handler.create_multipart_response(True, {
+                'batch_id': batch_id,
+                'file_info': result,
+                'total_pages': total_pages,
+                'processing_pages': f"{start_page}-{end_page}",
+                'page_count': end_page - start_page + 1,
+                'message': f'Batch processing started for {result["filename"]}'
+            }))
+        else:
+            return jsonify(default_handler.create_multipart_response(
+                False, {'error': 'Failed to start batch processing'}
+            )), 500
+
+    except Exception as e:
+        logger.error(f"Error in api_upload_batch: {str(e)}")
+        return jsonify(default_handler.create_multipart_response(
+            False, {'error': str(e)}
+        )), 500
+
+
+@app.route('/api/task/<task_id>', methods=['GET'])
+def api_task_status(task_id):
+    """Get status of a processing task"""
+    if task_id not in task_results:
+        return jsonify({
+            'success': False,
+            'error': 'Task not found'
+        }), 404
+
+    return jsonify({
+        'success': True,
+        'task': task_results[task_id]
+    })
+
+
+@app.route('/api/batch/<batch_id>', methods=['GET'])
+def api_batch_status(batch_id):
+    """Get status of a batch processing job"""
+    if not batch_processing_available:
+        return jsonify({
+            'success': False,
+            'error': 'Batch processing not available'
+        }), 503
+
+    processor = get_batch_processor(batch_id)
+    if not processor:
+        return jsonify({
+            'success': False,
+            'error': 'Batch not found'
+        }), 404
+
+    state = processor.get_state()
+    return jsonify({
+        'success': True,
+        'batch': state
+    })
+
+
+@app.route('/api/cleanup', methods=['POST'])
+def api_cleanup():
+    """Cleanup old uploaded files"""
+    try:
+        max_age_hours = int(request.json.get('max_age_hours', 24))
+        folder = request.json.get('folder', 'both')
+
+        removed_count = default_handler.cleanup_old_files(max_age_hours, folder)
+
+        return jsonify({
+            'success': True,
+            'removed_files': removed_count,
+            'message': f'Removed {removed_count} old files'
+        })
+    except Exception as e:
+        return jsonify({
+            'success': False,
+            'error': str(e)
+        }), 500
+
+# Add this streamlined endpoint to your app.py
+
+@app.route('/api/upload/doctags', methods=['POST'])
+def api_upload_doctags():
+    """
+    Simple API endpoint for uploading a PDF and getting DocTags output.
+    Automatically cleans up the uploaded file after processing.
+
+    Expects multipart/form-data with:
+    - file: PDF file
+    - page_num: (optional) Page number to analyze (default: 1)
+
+    Returns JSON with:
+    - success: boolean
+    - filename: original filename
+    - page: page number processed
+    - doctags: the DocTags content
+    """
+    uploaded_file_path = None
+
+    try:
+        # Check if file is in request
+        if 'file' not in request.files:
+            return jsonify({'success': False, 'error': 'No file part in request'}), 400
+
+        file = request.files['file']
+
+        # Save uploaded file temporarily
+        success, result = default_handler.save_uploaded_file(file, permanent=True)
+        if not success:
+            return jsonify({'success': False, 'error': result.get('error', 'Failed to save file')}), 400
+
+        # Store the uploaded file path for cleanup
+        uploaded_file_path = result['filepath']
+
+        # Get page number
+        page_num = request.form.get('page_num', '1')
+
+        # Run analyzer directly (synchronously)
+        command = f"python backend/page_treatment/analyzer.py --image {uploaded_file_path} --page {page_num} --start-page {page_num} --end-page {page_num}"
+
+        try:
+            # Run the command with timeout
+            process = subprocess.run(
+                command,
+                shell=True,
+                capture_output=True,
+                text=True,
+                input="n\n",
+                timeout=60  # 60 second timeout
+            )
+
+            if process.returncode != 0:
+                error_msg = process.stderr or 'Analyzer failed'
+                logger.error(f"Analyzer error: {error_msg}")
+                return jsonify({
+                    'success': False,
+                    'error': 'Analyzer failed',
+                    'details': error_msg
+                }), 500
+
+            # Check if doctags file was created
+            doctags_path = Path("results") / "output.doctags.txt"
+            if not doctags_path.exists():
+                return jsonify({
+                    'success': False,
+                    'error': 'DocTags file not generated'
+                }), 500
+
+            # Read the doctags content
+            with open(doctags_path, 'r', encoding='utf-8') as f:
+                doctags_content = f.read()
+
+            # Prepare successful response
+            response = {
+                'success': True,
+                'filename': result['filename'],
+                'page': int(page_num),
+                'doctags': doctags_content
+            }
+
+            # Clean up the uploaded file
+            try:
+                if uploaded_file_path and os.path.exists(uploaded_file_path):
+                    os.remove(uploaded_file_path)
+                    logger.info(f"Cleaned up uploaded file: {uploaded_file_path}")
+            except Exception as cleanup_error:
+                logger.error(f"Error cleaning up file: {cleanup_error}")
+                # Don't fail the request due to cleanup error
+
+            return jsonify(response)
+
+        except subprocess.TimeoutExpired:
+            return jsonify({
+                'success': False,
+                'error': 'Processing timeout - page took too long to analyze'
+            }), 500
+
+        except Exception as e:
+            logger.error(f"Processing error: {str(e)}")
+            return jsonify({
+                'success': False,
+                'error': f'Processing error: {str(e)}'
+            }), 500
+
+    except Exception as e:
+        logger.error(f"Error in api_upload_doctags: {str(e)}")
+        return jsonify({
+            'success': False,
+            'error': str(e)
+        }), 500
+
+    finally:
+        # Ensure cleanup happens even if there's an error
+        try:
+            if uploaded_file_path and os.path.exists(uploaded_file_path):
+                os.remove(uploaded_file_path)
+                logger.info(f"Cleaned up uploaded file in finally block: {uploaded_file_path}")
+        except Exception as cleanup_error:
+            logger.error(f"Error in finally cleanup: {cleanup_error}")
+
+# Add periodic cleanup task
+def periodic_cleanup():
+    """Run cleanup every hour"""
+    while True:
+        time.sleep(3600)  # Wait 1 hour
+        try:
+            removed = default_handler.cleanup_old_files(24, 'both')
+            if removed > 0:
+                logger.info(f"Periodic cleanup removed {removed} old files")
+        except Exception as e:
+            logger.error(f"Error in periodic cleanup: {str(e)}")
+
+# Start cleanup thread
+cleanup_thread = threading.Thread(target=periodic_cleanup)
+cleanup_thread.daemon = True
+cleanup_thread.start()
+
+
 def cleanup_task():
     """Periodic cleanup of old batch processors"""
     if not batch_processing_available:
@@ -905,4 +1410,4 @@ if __name__ == '__main__':
     else:
         logger.info("Batch processing features enabled.")
 
-    app.run(debug=True, host='127.0.0.1', port=5000)
\ No newline at end of file
+    app.run(debug=True, host='127.0.0.1', port=5000)
diff --git a/backend/multipart_handler.py b/backend/multipart_handler.py
new file mode 100644
index 0000000..a115342
--- /dev/null
+++ b/backend/multipart_handler.py
@@ -0,0 +1,217 @@
+#!/usr/bin/env python3
+"""
+Multipart File Upload Handler for DocTags
+Handles file upload processing and validation
+"""
+
+import os
+import time
+import logging
+from pathlib import Path
+from werkzeug.utils import secure_filename
+from werkzeug.datastructures import FileStorage
+import tempfile
+import shutil
+from typing import Optional, Dict, Tuple, List
+
+logger = logging.getLogger(__name__)
+
+class MultipartHandler:
+    """Handle multipart file uploads with validation and storage"""
+
+    ALLOWED_EXTENSIONS = {'pdf'}
+    MAX_FILE_SIZE = 100 * 1024 * 1024  # 100MB
+    UPLOAD_FOLDER = 'uploads'
+    TEMP_FOLDER = 'temp_uploads'
+
+    def __init__(self, upload_folder: str = None, temp_folder: str = None):
+        self.upload_folder = Path(upload_folder or self.UPLOAD_FOLDER)
+        self.temp_folder = Path(temp_folder or self.TEMP_FOLDER)
+        self._ensure_folders()
+
+    def _ensure_folders(self):
+        """Ensure upload and temp folders exist"""
+        for folder in [self.upload_folder, self.temp_folder]:
+            if not folder.exists():
+                folder.mkdir(parents=True)
+                logger.info(f"Created folder: {folder}")
+
+    def allowed_file(self, filename: str) -> bool:
+        """Check if file extension is allowed"""
+        return '.' in filename and \
+            filename.rsplit('.', 1)[1].lower() in self.ALLOWED_EXTENSIONS
+
+    def validate_file(self, file: FileStorage) -> Tuple[bool, Optional[str]]:
+        """
+        Validate uploaded file
+        Returns: (is_valid, error_message)
+        """
+        if not file:
+            return False, "No file provided"
+
+        if file.filename == '':
+            return False, "No file selected"
+
+        if not self.allowed_file(file.filename):
+            return False, f"Invalid file type. Allowed types: {', '.join(self.ALLOWED_EXTENSIONS)}"
+
+        # Check file size (if possible)
+        file.seek(0, os.SEEK_END)
+        file_size = file.tell()
+        file.seek(0)  # Reset file pointer
+
+        if file_size > self.MAX_FILE_SIZE:
+            return False, f"File too large. Maximum size: {self.MAX_FILE_SIZE / (1024*1024):.1f}MB"
+
+        return True, None
+
+    def save_uploaded_file(self, file: FileStorage, permanent: bool = True) -> Tuple[bool, Dict]:
+        """
+        Save uploaded file
+
+        Args:
+            file: The uploaded file
+            permanent: If True, save to uploads folder; if False, save to temp folder
+
+        Returns:
+            (success, result_dict) where result_dict contains:
+                - filepath: Path to saved file
+                - filename: Original filename
+                - unique_filename: Saved filename
+                - size: File size in bytes
+                - error: Error message if failed
+        """
+        # Validate file
+        is_valid, error_msg = self.validate_file(file)
+        if not is_valid:
+            return False, {'error': error_msg}
+
+        try:
+            # Secure the filename
+            original_filename = secure_filename(file.filename)
+            timestamp = int(time.time() * 1000)  # Millisecond timestamp
+
+            # Create unique filename
+            name_parts = original_filename.rsplit('.', 1)
+            if len(name_parts) == 2:
+                unique_filename = f"{name_parts[0]}_{timestamp}.{name_parts[1]}"
+            else:
+                unique_filename = f"{original_filename}_{timestamp}"
+
+            # Determine save location
+            save_folder = self.upload_folder if permanent else self.temp_folder
+            filepath = save_folder / unique_filename
+
+            # Save file
+            file.save(str(filepath))
+
+            # Get file size
+            file_size = os.path.getsize(filepath)
+
+            logger.info(f"Saved file: {filepath} (size: {file_size} bytes)")
+
+            return True, {
+                'filepath': str(filepath),
+                'filename': original_filename,
+                'unique_filename': unique_filename,
+                'size': file_size,
+                'permanent': permanent
+            }
+
+        except Exception as e:
+            logger.error(f"Error saving file: {str(e)}")
+            return False, {'error': f"Failed to save file: {str(e)}"}
+
+    def save_to_temp(self, file: FileStorage) -> Tuple[bool, Dict]:
+        """Save file to temporary folder"""
+        return self.save_uploaded_file(file, permanent=False)
+
+    def move_to_permanent(self, temp_filepath: str) -> Tuple[bool, Dict]:
+        """Move file from temp to permanent storage"""
+        try:
+            temp_path = Path(temp_filepath)
+            if not temp_path.exists():
+                return False, {'error': 'Temporary file not found'}
+
+            permanent_path = self.upload_folder / temp_path.name
+            shutil.move(str(temp_path), str(permanent_path))
+
+            return True, {
+                'filepath': str(permanent_path),
+                'moved_from': str(temp_path)
+            }
+        except Exception as e:
+            logger.error(f"Error moving file: {str(e)}")
+            return False, {'error': f"Failed to move file: {str(e)}"}
+
+    def cleanup_old_files(self, max_age_hours: int = 24, folder: str = 'both'):
+        """
+        Remove old files from upload/temp folders
+
+        Args:
+            max_age_hours: Maximum age of files in hours
+            folder: 'uploads', 'temp', or 'both'
+        """
+        folders_to_clean = []
+        if folder in ['uploads', 'both']:
+            folders_to_clean.append(self.upload_folder)
+        if folder in ['temp', 'both']:
+            folders_to_clean.append(self.temp_folder)
+
+        current_time = time.time()
+        max_age_seconds = max_age_hours * 3600
+        removed_count = 0
+
+        for folder_path in folders_to_clean:
+            if not folder_path.exists():
+                continue
+
+            for file_path in folder_path.glob('*.pdf'):
+                try:
+                    file_age = current_time - file_path.stat().st_mtime
+                    if file_age > max_age_seconds:
+                        file_path.unlink()
+                        removed_count += 1
+                        logger.info(f"Deleted old file: {file_path}")
+                except Exception as e:
+                    logger.error(f"Error deleting file {file_path}: {str(e)}")
+
+        return removed_count
+
+    def get_file_info(self, filepath: str) -> Optional[Dict]:
+        """Get information about an uploaded file"""
+        try:
+            path = Path(filepath)
+            if not path.exists():
+                return None
+
+            stats = path.stat()
+            return {
+                'filepath': str(path),
+                'filename': path.name,
+                'size': stats.st_size,
+                'created': stats.st_ctime,
+                'modified': stats.st_mtime,
+                'exists': True
+            }
+        except Exception as e:
+            logger.error(f"Error getting file info: {str(e)}")
+            return None
+
+    def create_multipart_response(self, success: bool, data: Dict) -> Dict:
+        """Create standardized response for multipart operations"""
+        response = {
+            'success': success,
+            'timestamp': time.time()
+        }
+
+        if success:
+            response['data'] = data
+        else:
+            response['error'] = data.get('error', 'Unknown error')
+
+        return response
+
+
+# Create a default instance
+default_handler = MultipartHandler()
\ No newline at end of file