diff --git a/hgext/phabricator.py b/hgext/phabricator.py
--- a/hgext/phabricator.py
+++ b/hgext/phabricator.py
@@ -718,11 +718,12 @@
         )
 
 
-def maketext(pchange, basectx, ctx, fname):
+def maketext(pchange, basectx, ctx, fname, options={}):
     """populate the phabchange for a text file"""
     repo = ctx.repo()
     fmatcher = match.exact([fname])
-    diffopts = mdiff.diffopts(git=True, context=32767)
+    context = options.get(b'context', 32767)
+    diffopts = mdiff.diffopts(git=True, context=context)
     _pfctx, _fctx, header, fhunks = next(
         patch.diffhunks(repo, basectx.p1(), ctx, fmatcher, opts=diffopts)
     )
@@ -884,7 +885,7 @@
         pdiff.addchange(pchange)
 
 
-def addmodified(pdiff, basectx, ctx, modified):
+def addmodified(pdiff, basectx, ctx, modified, diffoptions):
     """add modified files to the phabdiff"""
     for fname in modified:
         fctx = ctx[fname]
@@ -905,12 +906,12 @@
             makebinary(pchange, fctx)
             addoldbinary(pchange, oldfctx, fctx)
         else:
-            maketext(pchange, basectx, ctx, fname)
+            maketext(pchange, basectx, ctx, fname, diffoptions)
 
         pdiff.addchange(pchange)
 
 
-def addadded(pdiff, basectx, ctx, added, removed):
+def addadded(pdiff, basectx, ctx, added, removed, diffoptions):
     """add file adds to the phabdiff, both new files and copies/moves"""
     # Keep track of files that've been recorded as moved/copied, so if there are
     # additional copies we can mark them (moves get removed from removed)
@@ -983,7 +984,7 @@
             if renamed:
                 addoldbinary(pchange, oldfctx, fctx)
         else:
-            maketext(pchange, basectx, ctx, fname)
+            maketext(pchange, basectx, ctx, fname, diffoptions)
 
         pdiff.addchange(pchange)
 
@@ -993,7 +994,7 @@
         pdiff.addchange(movedchange)
 
 
-def creatediff(basectx, ctx):
+def creatediff(basectx, ctx, diffoptions={}):
     """create a Differential Diff"""
     repo = ctx.repo()
     repophid = getrepophid(repo)
@@ -1005,8 +1006,8 @@
     modified, added, removed, _d, _u, _i, _c = basectx.p1().status(ctx)
     # addadded will remove moved files from removed, so addremoved won't get
     # them
-    addadded(pdiff, basectx, ctx, added, removed)
-    addmodified(pdiff, basectx, ctx, modified)
+    addadded(pdiff, basectx, ctx, added, removed, diffoptions)
+    addmodified(pdiff, basectx, ctx, modified, diffoptions)
     addremoved(pdiff, basectx, ctx, removed)
     if repophid:
         pdiff.repositoryPHID = repophid
@@ -1078,6 +1079,7 @@
     olddiff=None,
     actions=None,
     comment=None,
+    diffoptions={},
 ):
     """create or update a Differential Revision
 
@@ -1115,7 +1117,7 @@
 
     transactions = []
     if neednewdiff:
-        diff = creatediff(basectx, ctx)
+        diff = creatediff(basectx, ctx, diffoptions)
         transactions.append({b'type': b'update', b'value': diff[b'phid']})
         if comment:
             transactions.append({b'type': b'comment', b'value': comment})
@@ -1387,6 +1389,7 @@
     if phids:
         actions.append({b'type': b'reviewers.add', b'value': phids})
 
+    diffoptions = {}
     drevids = []  # [int]
     diffmap = {}  # {newnode: diff}
 
@@ -1419,6 +1422,7 @@
                 olddiff,
                 actions,
                 opts.get(b'comment'),
+                diffoptions,
             )
 
             if fold: