diff --git a/pywb/cdx/cdxsource.py b/pywb/cdx/cdxsource.py
index 1bd3c158..71742041 100644
--- a/pywb/cdx/cdxsource.py
+++ b/pywb/cdx/cdxsource.py
@@ -1,5 +1,4 @@
 from pywb.utils.binsearch import iter_range
-from pywb.utils.loaders import SeekableTextFileReader
 
 from pywb.utils.wbexception import AccessException, NotFoundException
 from pywb.utils.wbexception import BadRequestException, WbException
@@ -29,7 +28,7 @@ class CDXFile(CDXSource):
         self.filename = filename
 
     def load_cdx(self, query):
-        source = SeekableTextFileReader(self.filename)
+        source = open(self.filename)
         return iter_range(source, query.key, query.end_key)
 
     def __str__(self):
diff --git a/pywb/cdx/zipnum.py b/pywb/cdx/zipnum.py
index e282dfc0..071319a5 100644
--- a/pywb/cdx/zipnum.py
+++ b/pywb/cdx/zipnum.py
@@ -9,7 +9,6 @@ from cdxsource import CDXSource
 from cdxobject import IDXObject
 
 from pywb.utils.loaders import BlockLoader
-from pywb.utils.loaders import SeekableTextFileReader
 from pywb.utils.bufferedreaders import gzip_decompressor
 from pywb.utils.binsearch import iter_range, linearsearch
 
@@ -113,7 +112,7 @@ class ZipNumCluster(CDXSource):
     def load_cdx(self, query):
         self.load_loc()
 
-        reader = SeekableTextFileReader(self.summary)
+        reader = open(self.summary)
 
         idx_iter = iter_range(reader,
                               query.key,
diff --git a/pywb/utils/binsearch.py b/pywb/utils/binsearch.py
index 7d939c18..4e3b506c 100644
--- a/pywb/utils/binsearch.py
+++ b/pywb/utils/binsearch.py
@@ -16,7 +16,9 @@ def binsearch_offset(reader, key, compare_func=cmp, block_size=8192):
     Optional compare_func may be specified
     """
     min_ = 0
-    max_ = reader.getsize() / block_size
+
+    reader.seek(0, 2)
+    max_ = reader.tell() / block_size
 
     while max_ - min_ > 1:
         mid = min_ + ((max_ - min_) / 2)
diff --git a/pywb/utils/loaders.py b/pywb/utils/loaders.py
index f86e4072..a1d12d27 100644
--- a/pywb/utils/loaders.py
+++ b/pywb/utils/loaders.py
@@ -198,34 +198,3 @@ class LimitReader(object):
             pass
 
         return stream
-
-
-#=================================================================
-# Local text file with known size -- used for binsearch
-#=================================================================
-class SeekableTextFileReader(object):
-    """
-    A very simple file-like object wrapper that knows it's total size,
-    via getsize()
-    Supports seek() operation.
-    Assumed to be a text file. Used for binsearch.
-    """
-    def __init__(self, filename):
-        self.fh = open(filename, 'rb')
-        self.filename = filename
-        self.size = os.path.getsize(filename)
-
-    def getsize(self):
-        return self.size
-
-    def read(self, length=None):
-        return self.fh.read(length)
-
-    def readline(self, length=None):
-        return self.fh.readline(length)
-
-    def seek(self, offset):
-        return self.fh.seek(offset)
-
-    def close(self):
-        return self.fh.close()
diff --git a/pywb/utils/test/test_binsearch.py b/pywb/utils/test/test_binsearch.py
index 40ea1f58..c599377e 100644
--- a/pywb/utils/test/test_binsearch.py
+++ b/pywb/utils/test/test_binsearch.py
@@ -59,7 +59,6 @@ org,iana)/about 20140126200706 http://www.iana.org/about text/html 200 6G77LZKFA
 #=================================================================
 import os
 from pywb.utils.binsearch import iter_prefix, iter_exact, iter_range
-from pywb.utils.loaders import SeekableTextFileReader
 
 from pywb import get_test_dir
 
@@ -67,17 +66,14 @@ from pywb import get_test_dir
 test_cdx_dir = get_test_dir() + 'cdx/'
 
 def print_binsearch_results(key, iter_func):
-    cdx =  SeekableTextFileReader(test_cdx_dir + 'iana.cdx')
-
-    for line in iter_func(cdx, key):
-        print line
-
+    with open(test_cdx_dir + 'iana.cdx') as cdx:
+        for line in iter_func(cdx, key):
+            print line
 
 def print_binsearch_results_range(key, end_key, iter_func, prev_size=0):
-    cdx =  SeekableTextFileReader(test_cdx_dir + 'iana.cdx')
-
-    for line in iter_func(cdx, key, end_key, prev_size=prev_size):
-        print line
+    with open(test_cdx_dir + 'iana.cdx') as cdx:
+        for line in iter_func(cdx, key, end_key, prev_size=prev_size):
+            print line
 
 
 if __name__ == "__main__":
diff --git a/pywb/utils/test/test_loaders.py b/pywb/utils/test/test_loaders.py
index 88368146..b64f2419 100644
--- a/pywb/utils/test/test_loaders.py
+++ b/pywb/utils/test/test_loaders.py
@@ -39,18 +39,6 @@ True
 # test with extra id, ensure 4 parts of the A-B=C-D form are present
 >>> len(re.split('[-=]', HMACCookieMaker('test', 'test', 5).make('extra')))
 4
-
-# SeekableTextFileReader Test
->>> sr = SeekableTextFileReader(test_cdx_dir + 'iana.cdx')
->>> sr.getsize()
-30399
-
->>> seek_read_full(sr, 100)
-'org,iana)/_css/2013.1/fonts/inconsolata.otf 20140126200826 http://www.iana.org/_css/2013.1/fonts/Inconsolata.otf application/octet-stream 200 LNMEDYOENSOEI5VPADCKL3CB6N3GWXPR - - 34054 620049 iana.warc.gz\\n'
-
-# seek, read, close
->>> r = sr.seek(0); sr.read(10); sr.close()
-' CDX N b a'
 """
 
 
@@ -58,7 +46,7 @@ True
 import re
 from io import BytesIO
 from pywb.utils.loaders import BlockLoader, HMACCookieMaker
-from pywb.utils.loaders import LimitReader, SeekableTextFileReader
+from pywb.utils.loaders import LimitReader
 
 from pywb import get_test_dir
 
diff --git a/pywb/warc/pathresolvers.py b/pywb/warc/pathresolvers.py
index 5419eeb9..469fbfb1 100644
--- a/pywb/warc/pathresolvers.py
+++ b/pywb/warc/pathresolvers.py
@@ -1,7 +1,6 @@
 import redis
 
 from pywb.utils.binsearch import iter_exact
-from pywb.utils.loaders import SeekableTextFileReader
 
 import urlparse
 import os
@@ -57,7 +56,7 @@ class RedisResolver:
 class PathIndexResolver:
     def __init__(self, pathindex_file):
         self.pathindex_file = pathindex_file
-        self.reader = SeekableTextFileReader(pathindex_file)
+        self.reader = open(pathindex_file)
 
     def __call__(self, filename):
         result = iter_exact(self.reader, filename, '\t')