diff --git a/app/routes/documents.py b/app/routes/documents.py
index 69a7093..56c6162 100644
--- a/app/routes/documents.py
+++ b/app/routes/documents.py
@@ -6,6 +6,7 @@ from pathlib import Path
 from fastapi import APIRouter, Depends, Form, Query, Request
 from fastapi.responses import HTMLResponse, RedirectResponse
 from fastapi.templating import Jinja2Templates
+from sqlalchemy import distinct
 from sqlalchemy.orm import Session, selectinload
 
 from app.db.deps import get_db
@@ -257,6 +258,22 @@ def _apply_reviewed_lines_to_layout(base_layout: dict | None, reviewed_text: str
     return new_layout
 
 
+
+def _get_existing_document_types(db: Session) -> list[str]:
+    rows = (
+        db.query(distinct(Document.document_type))
+        .filter(Document.document_type.isnot(None))
+        .order_by(Document.document_type.asc())
+        .all()
+    )
+    values: list[str] = []
+    for row in rows:
+        value = row[0]
+        if value:
+            values.append(str(value))
+    return values
+
+
 def _get_queue_navigation(db: Session, document: Document) -> dict:
     active_docs = (
         db.query(Document)
@@ -458,6 +475,23 @@ def list_documents(
     )
 
 
+
+@router.post("/{document_id}/save-document-type", response_class=RedirectResponse)
+def save_document_type_route(
+    document_id: str,
+    document_type: str = Form(""),
+    db: Session = Depends(get_db),
+):
+    document = db.query(Document).filter(Document.document_id == document_id).first()
+    if document is None:
+        return RedirectResponse(url="/documents/", status_code=303)
+
+    document.document_type = document_type.strip() or None
+    db.commit()
+
+    return RedirectResponse(url=f"/documents/{document.document_id}", status_code=303)
+
+
 @router.post("/{document_id}/rerun-ocr", response_class=RedirectResponse)
 def rerun_ocr(document_id: str, db: Session = Depends(get_db)):
     document = db.query(Document).filter(Document.document_id == document_id).first()
@@ -721,6 +755,7 @@ def document_detail(document_id: str, request: Request, queue: str | None = None
 
     selected_preset = _get_preset_by_id(db, preset_id)
     all_presets = _get_all_presets(db)
+    existing_document_types = _get_existing_document_types(db)
 
     extracted_form = _extracted_field_form_values(document, request)
     additional_form = _additional_field_form_values(document, selected_preset)
@@ -762,6 +797,7 @@ def document_detail(document_id: str, request: Request, queue: str | None = None
             "current_additional": current_additional,
             "presets": all_presets,
             "selected_preset_id": preset_id,
+            "existing_document_types": existing_document_types,
             "active_tab": active_tab,
             "active_page": "documents",
         },
diff --git a/app/templates/documents/detail.html b/app/templates/documents/detail.html
index ac426ac..d3f2e09 100644
--- a/app/templates/documents/detail.html
+++ b/app/templates/documents/detail.html
@@ -54,6 +54,26 @@
                     </form>
                 </div>
 
+                <form method="post" action="/documents/{{ document.document_id }}/save-document-type" style="margin-top: 1rem;">
+                    <div class="form-grid">
+                        <div class="form-field" style="position: relative;">
+                            <label for="document_type_input">Document type</label>
+                            <input
+                                id="document_type_input"
+                                type="text"
+                                name="document_type"
+                                value="{{ document.document_type or '' }}"
+                                placeholder="receipt"
+                                autocomplete="off"
+                            >
+                            <div id="document-type-suggestions" style="display:none; position:absolute; top:100%; left:0; right:0; z-index:20; background:#fff; border:1px solid #d7dce5; border-radius:12px; margin-top:0.35rem; max-height:220px; overflow-y:auto; box-shadow:0 10px 24px rgba(15,23,42,0.10);"></div>
+                        </div>
+                    </div>
+                    <div class="button-row" style="margin-top: 0.75rem;">
+                        <button type="submit">Save document type</button>
+                    </div>
+                </form>
+
                 <div class="queue-nav-row">
                     {% if prev_doc %}
                         <a class="button-link" href="/documents/{{ prev_doc.document_id }}">← Previous</a>
@@ -432,6 +452,59 @@
         syncScroll();
     }
 })();
+
+    const documentTypeInput = document.getElementById("document_type_input");
+    const documentTypeSuggestions = document.getElementById("document-type-suggestions");
+    const existingDocumentTypes = {{ existing_document_types|tojson }};
+
+    if (documentTypeInput && documentTypeSuggestions) {
+        function renderDocumentTypeSuggestions() {
+            const value = (documentTypeInput.value || "").trim().toLowerCase();
+
+            let matches = existingDocumentTypes.filter(function (item) {
+                return item && (!value || item.toLowerCase().includes(value));
+            });
+
+            if (value) {
+                matches = matches.filter(function (item) {
+                    return item.toLowerCase() !== value;
+                });
+            }
+
+            matches = matches.slice(0, 8);
+
+            if (!matches.length) {
+                documentTypeSuggestions.style.display = "none";
+                documentTypeSuggestions.innerHTML = "";
+                return;
+            }
+
+            documentTypeSuggestions.innerHTML = matches.map(function (item) {
+                return '<button type="button" class="doc-type-option" data-value="' + item.replace(/"/g, '&quot;') + '" style="display:block; width:100%; text-align:left; padding:0.7rem 0.85rem; border:0; background:#fff; cursor:pointer;">' + item + '</button>';
+            }).join("");
+
+            documentTypeSuggestions.style.display = "block";
+
+            documentTypeSuggestions.querySelectorAll(".doc-type-option").forEach(function (btn) {
+                btn.addEventListener("click", function () {
+                    documentTypeInput.value = btn.getAttribute("data-value") || "";
+                    documentTypeSuggestions.style.display = "none";
+                    documentTypeSuggestions.innerHTML = "";
+                    documentTypeInput.focus();
+                });
+            });
+        }
+
+        documentTypeInput.addEventListener("input", renderDocumentTypeSuggestions);
+        documentTypeInput.addEventListener("focus", renderDocumentTypeSuggestions);
+
+        document.addEventListener("click", function (e) {
+            if (!documentTypeSuggestions.contains(e.target) && e.target !== documentTypeInput) {
+                documentTypeSuggestions.style.display = "none";
+            }
+        });
+    }
+
 </script>
 </body>
 </html>