diff --git a/src/main/java/com/hlab/yanalyst/domain/channel/ChannelService.java b/src/main/java/com/hlab/yanalyst/domain/channel/ChannelService.java
index 76dcc08..9be19b6 100644
--- a/src/main/java/com/hlab/yanalyst/domain/channel/ChannelService.java
+++ b/src/main/java/com/hlab/yanalyst/domain/channel/ChannelService.java
@@ -452,13 +452,12 @@ public class ChannelService {
      * 음성 전사와 같은 자리(ChannelVideoScript)에 저장 → 스크립트 리스트/SRT/번역에 그대로 흐른다.
      */
     @Transactional
-    public ScriptResponseDto ocrFromCached(Long channelVideoId, File file, String lang,
-                                           Integer sampleFps, Integer confThreshold) {
+    public ScriptResponseDto ocrFromCached(Long channelVideoId, File file, java.util.Map<String, Object> formParams) {
         ChannelVideo video = channelVideoRepository.findById(channelVideoId)
                 .orElseThrow(() -> new IllegalArgumentException("Video not found: " + channelVideoId));
 
         String apiUrl = pythonBaseUrl + "/ocr_video";
-        log.info("Requesting screen-subtitle OCR for video {} (lang={}, fps={})", channelVideoId, lang, sampleFps);
+        log.info("Requesting screen-subtitle OCR for video {} (params={})", channelVideoId, formParams);
 
         try {
             HttpHeaders headers = new HttpHeaders();
@@ -466,12 +465,13 @@ public class ChannelService {
 
             MultiValueMap<String, Object> body = new LinkedMultiValueMap<>();
             body.add("file", toFileResource(file));
-            if (lang != null && !lang.isBlank()) {
-                body.add("lang", lang.trim());
+            // 서버 필드명 그대로(lang, sample_fps, conf_threshold, use_fullframe, crop_x/y/width/height...).
+            // 빈 값은 보내지 않아 /ocr_video 기본값(하단30% crop, sample_fps=3, conf=60)을 따른다.
+            if (formParams != null) {
+                for (java.util.Map.Entry<String, Object> e : formParams.entrySet()) {
+                    if (e.getValue() != null) body.add(e.getKey(), String.valueOf(e.getValue()));
+                }
             }
-            // null 이면 보내지 않아 Python /ocr_video 의 기본값(sample_fps=3, conf=60)을 따른다.
-            if (sampleFps != null) body.add("sample_fps", String.valueOf(sampleFps));
-            if (confThreshold != null) body.add("conf_threshold", String.valueOf(confThreshold));
 
             HttpEntity<MultiValueMap<String, Object>> request = new HttpEntity<>(body, headers);
             ResponseEntity<String> response = pythonRestTemplate.postForEntity(apiUrl, request, String.class);
diff --git a/src/main/java/com/hlab/yanalyst/domain/channel/ChannelVideoCurationController.java b/src/main/java/com/hlab/yanalyst/domain/channel/ChannelVideoCurationController.java
index d9d963b..e7f662f 100644
--- a/src/main/java/com/hlab/yanalyst/domain/channel/ChannelVideoCurationController.java
+++ b/src/main/java/com/hlab/yanalyst/domain/channel/ChannelVideoCurationController.java
@@ -178,8 +178,14 @@ public class ChannelVideoCurationController {
     public ApiResponse<Map<String, Object>> ocr(@PathVariable Long id,
                                                 @RequestParam(value = "lang", required = false) String lang,
                                                 @RequestParam(value = "sampleFps", required = false) Integer sampleFps,
-                                                @RequestParam(value = "confThreshold", required = false) Integer confThreshold) {
-        return ApiResponse.ok(curationService.ocrScreenSubtitles(id, lang, sampleFps, confThreshold));
+                                                @RequestParam(value = "confThreshold", required = false) Integer confThreshold,
+                                                @RequestParam(value = "useFullframe", required = false) Boolean useFullframe,
+                                                @RequestParam(value = "cropX", required = false) Integer cropX,
+                                                @RequestParam(value = "cropY", required = false) Integer cropY,
+                                                @RequestParam(value = "cropWidth", required = false) Integer cropWidth,
+                                                @RequestParam(value = "cropHeight", required = false) Integer cropHeight) {
+        return ApiResponse.ok(curationService.ocrScreenSubtitles(
+                id, lang, sampleFps, confThreshold, useFullframe, cropX, cropY, cropWidth, cropHeight));
     }
 
     @PostMapping("/{id}/translate")
diff --git a/src/main/java/com/hlab/yanalyst/domain/channel/ChannelVideoCurationService.java b/src/main/java/com/hlab/yanalyst/domain/channel/ChannelVideoCurationService.java
index 90d7f5d..980de56 100644
--- a/src/main/java/com/hlab/yanalyst/domain/channel/ChannelVideoCurationService.java
+++ b/src/main/java/com/hlab/yanalyst/domain/channel/ChannelVideoCurationService.java
@@ -165,12 +165,26 @@ public class ChannelVideoCurationService {
      * 음성 전사와 같은 자리에 저장되어 스크립트 리스트/SRT/번역에 그대로 흐른다. (기존 스크립트는 덮어씀)
      */
     @Transactional
-    public Map<String, Object> ocrScreenSubtitles(Long videoId, String lang, Integer sampleFps, Integer confThreshold) {
+    public Map<String, Object> ocrScreenSubtitles(Long videoId, String lang, Integer sampleFps, Integer confThreshold,
+                                                  Boolean useFullframe, Integer cropX, Integer cropY,
+                                                  Integer cropWidth, Integer cropHeight) {
         ChannelVideo v = find(videoId);
         java.io.File file = videoDownloadService.cachedFile(v.getId())
                 .orElseThrow(() -> new IllegalArgumentException(
                         "받은 원본이 없습니다. 먼저 '원본 다운로드'를 실행하세요."));
-        ScriptResponseDto dto = channelService.ocrFromCached(v.getId(), file, lang, sampleFps, confThreshold);
+
+        // /ocr_video 서버 필드명으로 폼 조립(null 은 빼서 서버 기본값 사용).
+        Map<String, Object> form = new LinkedHashMap<>();
+        if (lang != null && !lang.isBlank()) form.put("lang", lang.trim());
+        if (sampleFps != null) form.put("sample_fps", sampleFps);
+        if (confThreshold != null) form.put("conf_threshold", confThreshold);
+        if (useFullframe != null) form.put("use_fullframe", useFullframe);
+        if (cropX != null) form.put("crop_x", cropX);
+        if (cropY != null) form.put("crop_y", cropY);
+        if (cropWidth != null) form.put("crop_width", cropWidth);
+        if (cropHeight != null) form.put("crop_height", cropHeight);
+
+        ScriptResponseDto dto = channelService.ocrFromCached(v.getId(), file, form);
 
         Map<String, Object> result = new LinkedHashMap<>();
         result.put("hasScript", true);
diff --git a/src/main/resources/templates/rework.html b/src/main/resources/templates/rework.html
index 9227613..de5f173 100644
--- a/src/main/resources/templates/rework.html
+++ b/src/main/resources/templates/rework.html
@@ -152,6 +152,11 @@
                             <button class="btn btn-secondary px-3 py-2 flex items-center gap-1" id="ocrBtn" onclick="ocrScreen()" title="받은 원본 영상에 박힌 자막을 OCR로 추출(시간 싱크). 먼저 ‘원본 다운로드’ 필요">
                                 <i data-lucide="scan-text" style="width:15px;"></i> 화면 자막 OCR
                             </button>
+                            <span class="text-xs text-muted" title="OCR 대상 영역(하단). 좁힐수록 정확·빠름. 100=전체화면">자막영역 하단</span>
+                            <input id="ocrCropPct" type="number" value="30" min="10" max="100" step="5"
+                                title="OCR 대상 영역(하단 %). 100=전체화면"
+                                style="width:54px; padding:6px; background:var(--surface-2); border:1px solid var(--glass-border); border-radius:6px; color:var(--text); font-size:0.85rem;">
+                            <span class="text-xs text-muted">%</span>
                             <button class="btn btn-secondary px-3 py-2 flex items-center gap-1" id="copyBtn" onclick="copyToEditor()">
                                 <i data-lucide="copy" style="width:15px;"></i> 에디터로 복사
                             </button>
@@ -646,7 +651,19 @@
                 status.textContent = '화면 자막 OCR 중… (프레임 분석, 영상 길이에 따라 수십 초~)';
                 try {
                     const lang = document.getElementById('langSel').value || 'ko';
-                    const s = await api(API + '/' + VIDEO_ID + '/ocr?lang=' + encodeURIComponent(lang), { method:'POST' });
+                    let q = '?lang=' + encodeURIComponent(lang);
+                    // 자막영역(하단 N%)을 영상 실제 해상도로 환산해 crop 전달 → 정확도·속도↑
+                    const pct = Math.min(100, Math.max(10, parseInt(document.getElementById('ocrCropPct').value) || 30));
+                    const v = document.getElementById('localVideo');
+                    const vw = v ? v.videoWidth : 0, vh = v ? v.videoHeight : 0;
+                    if (pct >= 100) {
+                        q += '&useFullframe=true';
+                    } else if (vw > 0 && vh > 0) {
+                        const ch = Math.round(vh * pct / 100);
+                        q += '&useFullframe=false&cropX=0&cropWidth=' + vw + '&cropHeight=' + ch + '&cropY=' + (vh - ch);
+                    }
+                    // 영상 해상도를 못 읽으면 crop 생략 → 서버 기본(하단 30%) 적용
+                    const s = await api(API + '/' + VIDEO_ID + '/ocr' + q, { method:'POST' });
                     renderSegments(s.segments);
                     document.getElementById('transcript').value = s.transcript || '';
                     status.style.color = '#4ade80';